JP4991991B2 - Resolver - Google Patents

Description

  The present invention relates to a resolver that detects the rotational position of an electric motor.

  Conventionally, a resolver has been used to detect the rotational position of a three-phase AC brushless motor (hereinafter referred to as a BL (Blush less) motor). Since the resolver detects the rotational position using magnetic fluctuation, various devices have been devised so as not to be affected by the magnetism generated by the excitation of the BL motor.

For example, a motor in-phase winding is wound around a pair of opposing motor teeth, and an output winding of a resolver connected coaxially with the motor is wound around a pair of opposing resolver teeth, and a pair of motor teeth is wound around The winding direction of the applied winding and the output winding of one of the output windings applied to the pair of resolver teeth is the same direction between the pair of teeth, and the other winding direction A BL motor with a resolver has been proposed in which the magnetic fields generated by the motor and the resolver are canceled by making the two directions opposite to each other between the pair of teeth (see, for example, Patent Document 1).
JP 2004-159462 A

  By the way, when a three-phase winding (U, V, W) of a BL motor is divided into two (U1, V1, W1, U2, V2, W2) and driven by separate drivers in order to configure a redundant system. May be difficult to achieve synchronization in the two divided systems.

  For example, if a slight deviation occurs in the timing of passing current through two three-phase windings, the magnetic field generated from the three-phase winding of the motor will not be constant, and magnetic fields with different strength will be generated locally, resulting in magnetic interference. Therefore, the resolver as described above has a problem that it is difficult to cancel the influence of the magnetic field.

  Also, if the resolver is divided into two systems corresponding to the division of the three-phase winding of the motor into two systems, a deviation occurs in the angle signals of the two resolvers when there is a deviation in the synchronization of the excitation of the resolver. There was a problem.

  Therefore, even if the phase winding is installed in the vicinity of a BL motor divided into two systems, the present invention can accurately detect an angle without being affected by magnetic interference and can also configure a redundant system. The purpose is to provide a resolver.

  A resolver of one aspect of the present invention is a resolver that detects a rotational position of an electric motor having two systems of winding circuits including a plurality of pairs of phase windings, and is coaxially connected to the rotating shaft of the electric motor, A first sensor including a pair of SIN windings and a pair of first excitation windings, and is connected to the electric motor via the first sensor and is coaxially connected to a rotating shaft of the electric motor, A first resolver based on outputs of a COS winding and a second sensor including a pair of second excitation windings, one SIN winding of the first sensor, and one COS winding of the second sensor. Second arithmetic processing for calculating a second resolver output based on outputs of first arithmetic processing means for calculating an output, the other SIN winding of the first sensor, and the other COS winding of the second sensor Means for winding the pair of SIN windings. There position of zero, one of the pair of phase windings of the motor is the center of a pair of winding positions are wound.

  The first sensor has a plurality of teeth on the inner side and the outer side in the radial direction of the stator, and a plurality of teeth for winding the pair of SIN windings and the pair of first excitation windings. And one of the first excitation windings are wound around the inner teeth, the other SIN winding and the other first excitation winding are wound around the outer teeth, and the second sensor And a plurality of teeth for winding the pair of COS windings and the pair of second excitation windings on the inner side and the outer side in the radial direction of the stator, and one COS winding and one second excitation winding. And the other COS winding and the other second excitation winding are wound around the outer teeth, and the first arithmetic processing means is configured to transmit the first sensor to the first sensor. Wound around one of the teeth inside or outside The first resolver output is obtained based on an output signal obtained from an IN winding and a COS winding wound around one of the teeth inside or outside the second sensor, The second arithmetic processing means is wound around the SIN winding wound around either the inside or outside of the first sensor and the other tooth inside or outside of the second sensor. The second resolver output may be obtained based on an output signal obtained from the COS winding.

  In this case, the first arithmetic processing means is obtained by a SIN winding wound around a tooth inside the first sensor and a COS winding wound around a tooth inside the second sensor. The second resolver is configured to obtain the first resolver output based on an output signal, and the second arithmetic processing means includes a SIN winding wound around a tooth outside the first sensor, and an outer side of the second sensor. The second resolver output may be obtained based on an output signal obtained from the COS winding wound around the teeth.

  A resolver according to another aspect of the present invention is a resolver that detects a rotational position of an electric motor having two systems of winding circuits each including a plurality of pairs of phase windings, and is coaxially connected to a rotating shaft of the electric motor. A first sensor including a pair of COS windings and a pair of first excitation windings, and is connected to the electric motor via the first sensor and coaxially connected to the rotating shaft of the electric motor. SIN winding, a second sensor including a pair of second excitation windings, one COS winding of the first sensor, and one SIN winding of the second sensor. A second calculation for calculating the second resolver output based on outputs of the first calculation processing means for calculating the resolver output, the other COS winding of the first sensor, and the other SIN winding of the second sensor. A pair of COS windings. The position where the number is zero is a position (T is a COS winding) delayed by a mechanical angle by T / 4 period with respect to the center of a pair of winding positions around which any pair of phase windings of the motor is wound. Winding period).

  The first sensor has a plurality of teeth on the inner side and the outer side in the radial direction of the stator, and a plurality of teeth for winding the pair of COS windings and the pair of first excitation windings. And one of the first excitation windings is wound around the inner teeth, the other COS winding and the other first excitation winding are wound around the outer teeth, and the second sensor And a plurality of teeth for winding the pair of SIN windings and the pair of second excitation windings on the inner side and the outer side in the radial direction of the stator, and one SIN winding and one second excitation winding. And the other SIN winding and the other second excitation winding are wound around the outer teeth, and the first arithmetic processing means is configured to transmit the first sensor to the first sensor. Wound around one of the teeth inside or outside The first resolver output is configured to be obtained based on an output signal obtained from an OS winding and a SIN winding wound around one of the teeth inside or outside the second sensor, The second arithmetic processing means is wound around the other tooth inside or outside of the first sensor and the other tooth inside or outside the second sensor. The second resolver output may be obtained based on an output signal obtained from the SIN winding.

  In this case, the first arithmetic processing means is obtained by a COS winding wound around a tooth inside the first sensor and a SIN winding wound around a tooth inside the second sensor. The second resolver is configured to obtain the first resolver output based on an output signal. The second arithmetic processing means includes a COS winding wound around a tooth outside the first sensor, and an outer side of the second sensor. The second resolver output may be obtained based on an output signal obtained from the SIN winding wound around the teeth.

  Moreover, the 1st outer rotor rotated facing the teeth outside the said 1st sensor, and the 2nd outer rotor rotated facing the teeth outside the said 2nd sensor may be integrated.

  According to the present invention, even if the phase winding is installed in the vicinity of the BL motor divided into two systems, the angle can be accurately detected without being affected by magnetic interference, and a redundant system can be configured. A unique effect of providing a resolver is obtained.

  Embodiments to which the resolver of the present invention is applied will be described below.

[Embodiment 1]
FIG. 1 is a perspective view illustrating a mounted state of the resolver according to the first embodiment.

  The resolver of the first embodiment includes two sensors A and B, and these sensors A and B are attached to a BL motor as shown in FIG. 1, and the rotation shaft 1 is the rotation shaft of the BL motor. Connected coaxially.

  Such a BL motor is composed of, for example, an electric motor of an electric power steering device mounted on a vehicle or an electric motor for assisting a hybrid vehicle. The rotation shafts 1 of the sensors A and B are rotated with the rotation of the rotation shaft of the BL motor.

  The three-phase winding of the BL motor has two systems (U1-U1 ′, V1-V1 ′, W1-W1 ′ and U2-U2 ′, V2-V2 ′, W2-W2 ′) to form a redundant system. It is divided into

  2A and 2B are diagrams showing a cross-sectional configuration of the resolver according to the first embodiment. FIG. 2A shows a cross section along the longitudinal direction of the rotation axis, and FIG. 2B shows a cross section perpendicular to the rotation axis. FIG. 2B shows a cross section taken along the line AA in FIG. 2A, but for convenience of explaining the positional relationship with the winding of the BL motor, two systems of three-phase windings (U1-U1 ′, V1-V1 ′, W1-W1 ′ and U2-U2 ′, V2-V2 ′, W2-W2 ′) are shown shifted radially outward.

  As shown in FIG. 2A, sensors A and B have the same structure, and are connected to a BL motor in the order of sensor A and sensor B.

  Here, the structure of the sensor A will be described representatively. An inner rotor 2 and an outer rotor 3 are pivotally supported on the rotary shaft 1 and are configured to rotate together with the rotary shaft 1.

  Further, as shown in FIG. 2B, the inner rotor 2 has seven convex portions 2A for inducing magnetic fluctuations along the outer periphery, and the outer rotor 3 has seven convex portions. The portion 3A is formed along the inner periphery.

  The inner rotor 2 and the outer rotor 3 are located on the same straight line that includes the center of the rotation shaft 1 and the top of the convex portion 2A and the top of the convex portion 3A, and the boundary between the adjacent convex portions 2A, It is pivotally supported by the rotating shaft 1 in the aligned state so that the boundary between the adjacent convex portions 3A is positioned on the same straight line including the center of the rotating shaft 1.

  The rotating shaft 1 is formed with a positioning key 1A made of a non-magnetic material so that the positions where the electrical angles of the sensors A and B are zero are matched.

  As shown in FIG. 2 (b), the stator 4 of the sensor A is disposed concentrically between the inner rotor 2 and the outer rotor 3, and is used to wind a winding around the inner and outer periphery thereof. Ten teeth 4A (inner peripheral side) and four teeth 4B (outer peripheral side) are provided at equal intervals. The stator 4 is fitted to a support portion 5B extending radially inward from the inner wall portion 5A of the resolver housing 5 of the first embodiment. The above structure is the same for the sensors A and B.

  In the stator 4 of the sensor A, the SIN winding 6a and the excitation winding 7a are wound around the inner peripheral teeth 4A, and the SIN winding 6b and the excitation winding 7b are wound around the outer teeth 4B. ing.

  Further, in the stator 4 of the sensor B, the COS winding 8a and the excitation winding 9a are wound around the inner peripheral teeth 4A, and the COS winding 8b and the excitation winding 9b are wound around the outer teeth 4B. It has been turned.

  Here, the center of the position where the winding U1 and winding U1 ′ of the three-phase winding U1-U1 ′ of the BL motor are disposed, and the winding U2 and winding of the three-phase winding U2-U2 ′. A straight line passing through the center of the position where U2 ′ is disposed is defined as a straight line l.

  Further, in order to represent the positions of the 10 pairs of teeth 4A and 4B, a tooth position (1) is defined as shown in FIG. 2B, and the teeth position (10 ).

  In the resolver sensors A and B of the present embodiment, the central axes of the two pairs of teeth 4A and 4B located at the tooth position (1) and the tooth position (6) on the opposite side are positioned on a straight line l. Thus, it is connected to the BL motor. In addition, the number of turns of the SIN windings 6a and 6b in the two sets of teeth 4A and 4B at the tooth positions (1) and (6) is set to zero.

Table 1 shows the tooth position of the sensor A, the gap between the rotor and the tooth (the gap between the inner rotor 2 and the tooth 4A, and the gap between the outer rotor 3 and the tooth 4B), and the windings of the SIN windings 6a and 6b. It is a table | surface which shows the direction in the radial direction of the magnetic field which generate | occur | produces with a direction and the number of turns, and a three-phase winding.

  In addition, the gap and the direction of the magnetic field shown in Table 1 are those in the state where the electrical angle of the BL motor is 0 degree.

  In the three-phase winding, the winding directions are reversed between the windings U1, V1, W1, U2, V2, and W2 and the windings U1′V1 ′, W1 ′, U2 ′, V2 ′, and W2 ′. Therefore, when the electrical angle of the BL motor is 0 degree, a radially inward magnetic field is generated in the windings U1, V1, W1, U2, V2, and W2, and the windings U1′V1 ′, A radially outward magnetic field is generated at W1 ′, U2 ′, V2 ′, and W2 ′. For this reason, Table 1 shows the magnetic field generated by the nearest winding at each tooth position.

  The SIN winding 6a is wound so that two cycles of SIN waves can be obtained at the tooth positions (1) to (10), and both ends thereof are drawn out at the tooth position (1) and connected to an ECU 10A described later. ing. At the tooth positions (1) and (6), the number of turns around the tooth 4A is zero.

  The same applies to the SIN winding 6b wound around the tooth 4B at the tooth positions (1) to (10). Both ends of the SIN winding 6b drawn outside at the tooth position (1) will be described later. It is connected to the ECU 10B.

  From the symmetry of the teeth position, teeth positions (3) and (8), teeth positions (2) and (7), teeth positions (1) and (6), teeth positions (5) and (9), and teeth At positions (4) and (8), the gap between the rotor and the tooth, the winding direction and number of windings, and the direction of the magnetic field are the same.

  As for the sensor A, as described above, the central axes of the two pairs of teeth 4A and 4B at the teeth position (1) and the teeth position (6) at the diagonal are positioned on the straight line l. The number of turns of the SIN windings 6a and 6b in the two sets of teeth 4A and 4B at the tooth positions (1) and (6) is set to zero while being connected to the BL motor.

  On the other hand, the sensor B can be wound around the teeth 4A and 4B so that the COS windings 8a and 8b can output a signal whose phase is delayed by 90 degrees with respect to the SIN windings 6a and 6b of the sensor A. The COS winding 8a is connected to an ECU 10A described later, and the COS winding 8b is connected to an ECU 10B described later.

  FIG. 3 is an enlarged view of a part of the stator 4 of the resolver according to the first embodiment. As shown here, the stator 4 has teeth 4A and 4B on the inner peripheral side and the outer peripheral side, and has slits 4C formed over the circumferential direction.

  This slit 4C causes magnetic interference between the inner peripheral side and the outer peripheral side of the stator 4 due to a magnetic field generated when a current flows through the SIN winding, the COS winding, and the excitation winding wound around the teeth 4A and 4B. It is provided to suppress the occurrence, and is configured such that the magnetic resistance is increased by the slit 4C.

  As shown in FIG. 2B, the slits 4C are formed in the stator 4 at equal intervals along the circumferential direction, and both ends of each slit 4C may be branched. A circular through-hole shaped slit 4D may be formed therebetween.

  FIG. 4 is a diagram illustrating a circuit configuration of the resolver according to the first embodiment. As shown in this figure, the sensor A includes a pair of SIN windings 6a and 6b and a pair of excitation windings 7a and 7b. The sensor B includes a pair of COS windings 8a and 8b and a pair of excitation windings 9a and 9b.

  The resolver of the first embodiment includes two arithmetic processing units ECU (Electronic Control Unit) 10A and 10B. The ECUs 10A and 10B are configured with a microcomputer including a CPU, a ROM, a RAM, and the like connected to each other via a bus (not shown).

  The excitation windings 7a and 9a wound around the teeth 4A on the inner peripheral side of the sensors A and B are connected in parallel to the excitation signal output terminal of the ECU 10A, and excitation signals are simultaneously applied (that is, the excitation operation is synchronized). Configured).

  Further, the excitation windings 7b and 9b wound around the teeth 4B on the outer peripheral side of the sensors A and B are connected in parallel to the excitation signal output terminal of the ECU 10B, and excitation signals are applied simultaneously (that is, the excitation operation is synchronized). To be taken).

  FIG. 5 is a diagram illustrating a configuration of the output circuit of the resolver according to the first embodiment.

  As shown in this figure, the SIN winding 6a wound around the teeth 4A on the inner peripheral side of the sensor A and the COS winding 8a wound around the teeth 4A on the inner peripheral side of the sensor B are: It is connected to the ECU 10A.

  The ECU 10A applies an excitation signal to the excitation windings 7a and 9a, and detects the rotation angle of the inner rotor 2 (that is, the rotation angle of the rotating shaft 1) based on outputs obtained from the SIN winding 6a and the COS winding 8a. .

  Further, the SIN winding 6b wound around the teeth 4B on the outer peripheral side of the sensor A and the COS winding 8b wound on the teeth 4B on the outer peripheral side of the sensor B are connected to the ECU 10B.

  The ECU 10B applies an excitation signal to the excitation windings 7b and 9b, and detects the rotation angle of the outer rotor 3 (that is, the rotation angle of the rotating shaft 1) based on outputs obtained from the SIN winding 6b and the COS winding 8b. .

  Here, the principle of detecting the rotation angle in the resolver will be briefly described. An excitation signal having a constant frequency is applied to the excitation windings 7a and 9a of the resolver.

  The resolver is configured to output a signal of k periods (k is an integer: “7” in FIG. 2), that is, a signal of the same level every 360 ° / k in the process of the inner rotor 2 rotating once. . This is because the gap between the convex portion 2A and the excitation windings 7a and 9a continuously varies with rotation because the inner rotor 2 has the convex portion 2A.

  The SIN winding 6a and the COS winding 8a have a sine wave shape or a cosine wave shape depending on the rotation angle position of the inner rotor 2 when the excitation signal to the excitation windings 6a and 8a becomes maximum and minimum, respectively. It is configured to change (see Table 1), and outputs a current and a voltage that are out of phase with each other by 90 °.

  Since both the SIN winding 6a and the COS winding 8a are connected to the ECU 10A, the ECU 10A offsets each coil signal supplied from both the SIN winding 6a and the COS winding 8a from “0”. It converts into an output voltage and the rotation angle position of the inner rotor 2, ie, the rotating shaft 1, in the range of 0 degree and 360 degrees / k is detected based on the relationship between both output voltages.

  This is the same between the excitation windings 7b and 9b, the SIN winding 6b, and the COS winding 8b connected to the ECU 10B, and the outer rotor 3 has the convex portion 3A. The gap between the convex portion 3A and the excitation windings 7b and 9b continuously fluctuates, and the same level signal is output every 360 ° / k, whereby the rotation angle is detected.

  As described above, according to the resolver of the first embodiment, the rotation angle is detected using the sensors A and B sequentially connected adjacent to the BL motor.

  Since the sensor A is arranged on the side close to the BL motor in which the three-phase winding is divided into two systems in order to form a redundant system, current is passed through the three-phase windings of the two systems of the BL motor. When a slight deviation occurs in timing, magnetic fields with different intensities are generated locally and are easily affected by magnetic interference. On the other hand, the sensor B is less susceptible to magnetic interference than the sensor A because the sensor A is between the BL motor and the sensor B.

  Further, as shown in FIG. 2B, the central axes of the two pairs of teeth 4A and 4B at the tooth position (1) and the tooth position (6) on the opposite side are positioned on a straight line l. In addition, the number of turns of the SIN windings 6a and 6b in the two sets of teeth 4A and 4B at the tooth positions (1) and (6) is set to zero while being connected to the BL motor. The winding direction and the number of turns of 6a are symmetrical with respect to the tooth position (1) at the tooth positions (2) and (3) and the tooth positions (10) and (9), and the winding direction of the SIN winding 6b. The number of turns is symmetrical with respect to the tooth position (1) at the tooth positions (7) and (8) and the tooth positions (5) and (4).

  As a result, the noise generated in the teeth positions (2) and (3) in the SIN winding 6a is canceled by the noise generated in the teeth positions (10) and (9), and the teeth position (7) in the SIN winding 6b. And the noise generated in (8) is canceled by the noise generated in the tooth positions (5) and (4).

  For this reason, the SIN windings 6a and 6b of the sensor A cause a phase difference in the excitation of the BL motor in which the three-phase winding is divided into two systems, thereby generating magnetic fields with different intensities locally and causing magnetic interference. Even if it occurs, it is configured so that its influence can be minimized.

  6A and 6B are diagrams for explaining the operation of the resolver according to the present embodiment. FIG. 6A is a diagram showing an energization pattern of a BL motor to which the resolver according to the present embodiment is connected. FIG. It is a figure which shows the waveform of an output and a COS output. FIG. 6B shows the output of the SIN winding 6a of the sensor A and the output of the COS winding 8a of the sensor B. These are input to the ECU 10A.

  As shown in FIG. 6A, the BL motor is driven by sequentially energizing the U phase, the V phase, and the W phase. Note that the phases are U phase (U1-U1 ', U2-U2'), V phase (V1-V1 ', V2-V2'), and W phase (W1-W1 ', W2-W2').

  As a result, as shown in FIG. 6B, when an excitation signal is applied to the excitation winding 7a of the sensor A of the resolver and the excitation winding 8a of the sensor B, the SIN winding 6a of the sensor A A SIN wave signal shown in FIG. 6B is output, and a COS wave signal shown in FIG. 6B is output from the COS winding 8a of the sensor B.

  The sensor A arranged on the side close to the BL motor is such that the central axes of the two pairs of teeth 4A and 4B at the tooth position (1) and the tooth position (6) on the opposite side are positioned on a straight line l. Since the number of turns of the SIN windings 6a and 6b in the two sets of teeth 4A and 4B at the tooth positions (1) and (6) is set to zero, it is output. Even if a slight deviation occurs in the timing at which current flows through the three-phase windings of the two BL motors, the SIN wave-like signal can be minimized. For this reason, highly accurate angle detection can be performed.

  As described above, in the resolver using such sensors A and B, the ECU 10A simultaneously combines the excitation winding 7a on the inner peripheral side of the sensor A on the side close to the motor and the excitation winding 9a on the sensor B on the side far from the motor. In order to calculate the rotation angle of the rotating shaft 1 based on the SIN wave signal and the COS wave signal obtained from the SIN winding 6a and the COS winding 8a on the inner peripheral side of the sensors A and B, Even when magnetic fields having different strengths are generated and magnetic interference occurs, the influence of magnetic interference can be minimized, and highly accurate angle detection can be performed.

  Similarly, the ECU 10B simultaneously excites the excitation winding 7b on the outer side of the sensor A on the side close to the motor and the excitation winding 9b on the sensor B on the side far from the motor, Since the rotation angle of the rotating shaft 1 is calculated based on the SIN wave signal and the COS wave signal obtained from a certain SIN winding 6b and COS winding 8b, magnetic interferences with locally different strengths are generated in the BL motor. Even if it occurs, the influence of magnetic interference can be minimized, and highly accurate angle detection can be performed.

  Further, as described above, a pair of ECUs 10A and 10B are obtained by winding two pairs of SIN windings (6a, 6b) and COS windings (8a, 8b) around the sensors A and B to obtain outputs of two systems. It is possible to provide a resolver that includes a redundant system.

  Moreover, although the above description demonstrated the form of the convex part 2A of the inner rotor 2 and the convex part 3A of the outer rotor 3 of the sensors A and B, the number of these convex parts is limited to seven. It is not a thing and it can change suitably according to a use.

  In the above description, the sensor A around which the SIN windings 6a and 6b are wound is arranged on the side close to the BL motor. However, the sensor B and the sensor around which the COS windings 8a and 8b are wound are described. The position of A may be switched.

  In this case, when magnetic interference is generated by locally generating different magnetic fields in the BL motor, the COS windings 8a and 8b of the sensor B are easily affected by the magnetic interference, and the SIN winding 6a of the sensor A. And 6b are less susceptible to magnetic interference.

  For this reason, the position where the number of turns of the COS windings 8a and 8b of the sensor B is zero is a mechanical angle with respect to the center of a pair of winding positions where any three-phase winding of the BL motor is wound. The sensor B may be connected to the BL motor so that the position is delayed by T / 4 period (T is the winding period of the COS winding). That is, as shown in FIG. 2B, when the winding cycle of the COS windings 8a and 8b is 180 degrees, the tooth positions (1) and (6) in FIG. 180 degrees / 4) The sensor B may be attached so as to come to the rotated position.

  Further, as shown in FIG. 1, a sensor A around which SIN windings 6a and 6b are wound is connected to a BL motor, and a sensor B around which COS windings 8a and 8b are wound is connected to this sensor A. Even in the case where the number of turns of the COS windings 8a and 8b of the sensor B is zero, the positions of the teeth 4A and 4B are the centers of a pair of winding positions where any three-phase windings of the BL motor are wound. On the other hand, the position may be a position delayed by a T / 4 cycle by the mechanical angle (T is the winding cycle of the COS winding). This is particularly effective when the sensor B may be affected by magnetic interference.

[Embodiment 2]
7A and 7B are diagrams showing the configuration of the resolver according to the second embodiment. FIG. 7A shows a cross section perpendicular to the rotation axis, and FIG. 7B shows a cross section along the longitudinal direction of the rotation axis. FIG. 7A shows a cross section taken along the line B-B in FIG.

  The cross section of the sensor A shown in FIG. 7A is the same structure as the sensor A of the first embodiment shown in FIG. 2B, and this is the same as the cross section structure of the sensor B. In the second embodiment, as shown in FIG. 7 (b), the orientation of the sensor B is opposite to that in the first embodiment, and the outer rotor 3 of the sensors A and B is integrated with the nonmagnetic body 3A. This is different from the first embodiment. Since other configurations are the same as those of the resolver of the first embodiment, description thereof is omitted.

  According to the resolver of the second embodiment as described above, the outer rotors 3 of the sensors A and B can be configured integrally, so that the manufacturing cost and the installation space can be reduced.

  Although the resolver according to the exemplary embodiment of the present invention has been described above, the present invention is not limited to the specifically disclosed embodiment, and various modifications can be made without departing from the scope of the claims. Can be modified or changed.

FIG. 1 is a perspective view illustrating a mounted state of the resolver according to the first embodiment. It is a figure which shows the cross-sectional structure of the resolver of Embodiment 1, (a) shows the cross section along the longitudinal direction of a rotating shaft, (b) shows a cross section perpendicular | vertical to a rotating shaft. FIG. 3 is an enlarged view showing a part of a stator 4 of the resolver according to the first embodiment. 3 is a diagram illustrating a circuit configuration of a resolver according to the first embodiment. FIG. 3 is a diagram illustrating a configuration of an output circuit of a resolver according to the first embodiment. FIG. It is operation | movement explanatory drawing of the resolver of this Embodiment, (a) is a figure which shows the electricity supply pattern of BL motor to which the resolver of this Embodiment is connected, (b) is an excitation signal of a resolver, SIN output, and COS It is a figure which shows the waveform of an output. It is a figure which shows the structure of the resolver of Embodiment 2, (a) shows a cross section perpendicular | vertical to a rotating shaft, (b) shows the cross section along the longitudinal direction of a rotating shaft.

Explanation of symbols

A, B Sensor 1 Rotating shaft 1A Key 2 Inner rotor 2A, 3A Convex part 3 Outer rotor 4 Stator 4A, 4B Teeth 4C, 4D Slit 5 Housing 5A Inner wall part 5B Support part 6a, 6b SIN winding 7a, 7b, 9a 9b Excitation winding 8a, 8b COS winding 10A, 10B ECU

Claims (7)

A resolver for detecting a rotational position of an electric motor having two systems of winding circuits including a plurality of pairs of phase windings,
A first sensor coaxially connected to the rotating shaft of the motor and including a pair of SIN windings and a pair of first excitation windings;
A second sensor connected to the electric motor via the first sensor and coaxially connected to the rotating shaft of the electric motor, and including a pair of COS windings and a pair of second excitation windings;
First arithmetic processing means for calculating a first resolver output based on outputs of one SIN winding of the first sensor and one COS winding of the second sensor;
And a second arithmetic processing means for calculating a second resolver output based on outputs of the other SIN winding of the first sensor and the other COS winding of the second sensor, and the pair of SIN windings The position where the number of turns is zero is the resolver, which is the center of a pair of winding positions where any one of the pair of phase windings of the motor is wound. The first sensor has a plurality of teeth for winding the pair of SIN windings and the pair of first excitation windings on the inner side and the outer side in the radial direction of the stator. And the other SIN winding and the other first excitation winding are wound around the outer teeth, and the first excitation winding is wound around the inner teeth.
The second sensor has a plurality of teeth for winding the pair of COS windings and the pair of second excitation windings on the inner side and the outer side in the radial direction of the stator. And the other COS winding and the other second excitation winding are wound around the outer teeth.
The first arithmetic processing means is wound around a SIN winding wound around one of the teeth inside or outside the first sensor and around one of the teeth inside or outside the second sensor. The first resolver output is obtained based on the output signal obtained from the COS winding and
The second arithmetic processing means is wound around a SIN winding wound around either the inside or outside of the first sensor and around the other tooth inside or outside the second sensor. The resolver according to claim 1, wherein the resolver is configured to obtain the second resolver output based on an output signal obtained from the COS winding. The first arithmetic processing means is based on an output signal obtained from a SIN winding wound around a tooth inside the first sensor and a COS winding wound around a tooth inside the second sensor. Configured to obtain the first resolver output;
The second arithmetic processing means is based on an output signal obtained from a SIN winding wound around a tooth outside the first sensor and a COS winding wound around a tooth outside the second sensor. The resolver according to claim 2, configured to obtain the second resolver output. A resolver for detecting the rotational position of an electric motor having two systems of winding circuits including a plurality of pairs of phase windings,
A first sensor coaxially connected to the rotating shaft of the motor and including a pair of COS windings and a pair of first excitation windings;
A second sensor connected to the electric motor via the first sensor and coaxially connected to the rotating shaft of the electric motor, and including a pair of SIN windings and a pair of second excitation windings;
First arithmetic processing means for calculating a first resolver output based on outputs from one COS winding of the first sensor and one SIN winding of the second sensor;
And a second arithmetic processing means for calculating a second resolver output based on outputs of the other COS winding of the first sensor and the other SIN winding of the second sensor, and the pair of COS windings The position where the number of turns is zero is a position (T is COS) that is delayed by a mechanical angle by a T / 4 period with respect to the center of a pair of winding positions around which any pair of phase windings of the motor is wound. Resolver, which is the winding period of the winding. The first sensor includes a plurality of teeth for winding the pair of COS windings and the pair of first excitation windings on the inner side and the outer side in the radial direction of the stator. And the other COS winding and the other first excitation winding are wound around the outer teeth.
The second sensor has a plurality of teeth for winding the pair of SIN windings and the pair of second excitation windings on the inner side and the outer side in the radial direction of the stator. The second excitation winding is wound around the inner teeth, and the other SIN winding and the other second excitation winding are wound around the outer teeth.
The first arithmetic processing means is wound around a COS winding wound around one of the teeth inside or outside the first sensor and around one of the teeth inside or outside the second sensor. The first resolver output is obtained based on the output signal obtained from the SIN winding.
The second arithmetic processing means is wound around the other tooth inside or outside the first sensor and the other tooth inside or outside the second sensor. The resolver according to claim 4, wherein the resolver is configured to obtain the second resolver output based on an output signal obtained from the SIN winding. The first arithmetic processing means is based on an output signal obtained from a COS winding wound around a tooth inside the first sensor and a SIN winding wound around a tooth inside the second sensor. Configured to obtain the first resolver output;
The second arithmetic processing means is based on an output signal obtained from a COS winding wound around a tooth outside the first sensor and a SIN winding wound around a tooth outside the second sensor. The resolver according to claim 5, configured to obtain the second resolver output.   The first outer rotor that rotates to face the teeth on the outside of the first sensor and the second outer rotor that rotates to face the teeth on the outside of the second sensor are integrated. The resolver according to any one of 3, 5, and 6.