JPH059175U - motor - Google Patents

Abstract

(57) [Summary] [Purpose] To flatten the torque distribution and increase the effective torque value. [Structure] There are nine magnetic poles, and one kind is provided for each of these magnetic poles.
It is a motor provided with an armature around which a coil is wound, and alternating polarity 6-pole or 12-pole field means provided so as to be rotatable relative to the armature. The armature is integrally formed by crimping laminated core plates, and each of the nine magnetic pole portions has a crimp portion which is crimped to one of the three magnetic pole portions. There is. These caulking portions are the first magnetic pole portion of the armature and the fifth magnetic pole portion.
Are provided on the magnetic pole portion and the sixth magnetic pole portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor provided with an armature of one type and one coil for three phases and nine poles, and field means for alternating poles of six or twelve poles.

[0002]

[Prior Art]

 Conventionally, an armature with one pole and one coil, three phases and nine poles, and field means with six poles of alternating polarity, which are provided so as to be rotatable relative to the armature, are provided. As a motor in which the respective poles are arranged substantially circularly in each case, there is a motor as shown in FIG. 5 which is a schematic plan view and FIG. 6 which is a development conceptual diagram of the motor.

5 and 6, the stator 10 (armature) including the stator core 100 and the winding wire 20 wound around the stator core 100 and the rotor magnet 30 in this conventional motor are substantially rotated. It is configured symmetrically. Then, a set of coils (201, 204, 207) of the same phase have the same polarity to a set of stator teeth (magnetic poles) located at 120-degree intervals of the stator core 100, for example, the stator teeth indicated by the numbers 101, 104, 107. Is wound around. FIG. 5 shows the arrangement and winding polarity of each coil in each phase, and CW indicates clockwise when viewed from the outside of the stator teeth. Further, N and S in MG of FIG. 6 respectively indicate polarities on the inner peripheral side of the rotor magnet 30.

The stator core 100 is formed by stacking a predetermined number of core plates (which can be formed of, for example, electromagnetic steel plates) having a thickness of usually 0.35 to 0.50 mm, and then rivets, pack caulking, or the like. Are integrally formed by. Numerals 40, 41 and 42 are caulked portions of the stator core 100, and stator teeth 109, 103 and 106 are provided at 120 degree intervals in order to avoid distortion of the core shape due to caulking.

[0005]

[Problems to be solved by the device]

 In recent years, in order to meet the demand for smaller and lighter devices, motors have been downsized accordingly. In particular, the outer diameter of a motor is remarkably reduced, and a stator having a core diameter of about 20 to 30 mm and a core laminated thickness of several mm is not uncommon. However, in conventional motors, the size of the caulking part provided on the stator core is relatively large compared to the shape of the stator core due to such miniaturization.

In this conventional motor, the stator teeth having the crimped portions 40, 41 and 42, that is, 109, 103 and 106 are excited in the winding 20 with respect to the other stator teeth having no crimped portion. The inductance of the magnetic flux is small, and the magnetic resistance to the rotor magnet 30 is large. Moreover, as is apparent from FIG. 5, the stator teeth having the crimped portions are concentrated only in the third phase, and the crimped portions are not provided in the other first and second phases. Therefore, the maximum value of the generated torque becomes uneven, the torque ripple becomes large, and as a result, the effective torque is reduced, and it is unavoidable that adverse effects such as uneven rotation occur.

The present invention has been made in view of the above problems existing in the prior art. The problem is that the torque distribution is flat and the torque ripple is reduced to a low level. It is to provide a motor that can increase the effective value of torque while suppressing it.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the motor of the present invention has nine magnetic pole parts, and an armature around which one coil of one kind is wound around these magnetic pole parts, and a relative rotation of the armature. A motor having a pole means of 6 poles or 12 poles of alternating polarity, wherein the armature is integrally formed by crimping laminated core plates. Each of the nine magnetic pole portions has a crimp portion which is crimped at one location, and these crimp portions include a first magnetic pole portion of the armature and a fifth magnetic pole portion. , And the sixth magnetic pole portion.

[0009]

[Action]

 Since the respective poles of the armature and the field means are arranged substantially evenly in a circular shape, the poles of the armature are substantially at a central angle of 40 degrees, and the poles of the field means are at a substantially central angle. It is located every 60 degrees or 30 degrees. The poles of this field means are arranged in alternating polarities, and the armature is composed of one pole and one coil, and the coils of the same phase are wound as a set of three coils arranged every 120 degrees. Has been done.

On the other hand, one caulking portion of the core is provided for each of the first magnetic pole portion, the fifth magnetic pole portion, and the sixth magnetic pole portion. Therefore, each phase coil has one caulking portion among the three coils of the same phase, and the inductance of each phase and the magnetic resistance to the rotor magnet are substantially equal. Therefore, the maximum value of the generated torque becomes uniform, the torque ripple is reduced, and the uneven rotation is reduced.

[0011]

【Example】

 An embodiment of a motor according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic plan view of a motor. The same parts already used in FIG. 5 are given the same numbers. Further, since the development conceptual diagram of the motor of this embodiment is the same as that of FIG. 6 already used, it is used as it is. 100 is a stator core. The stator core 100 has nine slots and stator teeth, and has substantially nine-fold rotational symmetry. The stator teeth have nine poles 101 to 109, and are substantially arranged at every central angle of 40 degrees. Here, for example, the stator tooth 101 is defined as the first magnetic pole, the stator tooth 102 is defined as the second magnetic pole, and the stator tooth 103 is defined as the third magnetic pole in the clockwise direction of FIG. It has 9 magnetic poles.

In the stator core 100 shown in this embodiment, ten core plates (formed of electromagnetic steel plates) having an outer diameter of 27 mm and a thickness of 0.35 mm are laminated, and are integrally formed by pack caulking. Reference numerals 61 to 63 in FIG. 1 denote caulking portions formed by this pack caulking, and are caulked in a substantially central portion of the magnetic pole portion corresponding to each stator tooth in the stacking direction of the core plates by a pressing device or the like. The caulking portion 61 is the stator tooth 101 as the first magnetic pole, the caulking portion 62 is the stator tooth 105 as the fifth magnetic pole, and the caulking portion 63 is the stator tooth 106 as the sixth magnetic pole. , Respectively.

The stator core 100 is provided with windings 20 that are driven in three phases. As shown in FIGS. 1 and 6, coils of the same phase are wound in the same polarity (CW: clockwise when viewed from the outside of the stator tooth) on a pair of stator teeth that are substantially spaced 120 degrees apart. .. That is, the coil 201, which is the first phase of the winding 20, is wound around the stator tooth 101, then wound around the stator tooth 104, and further wound around the stator tooth 107, and these are connected in series. Similarly, the coil 202, which is the second phase, is similarly wound around the stator teeth 102, 105, 108, and these are connected in series. Further, the third-phase coil 203 is also wound around the stator teeth 109, 103, 106 and connected in series. The first-phase, second-phase, and third-phase coil wires are, for example, star-shaped connected (not shown) and connected to the drive circuit. In this way, the stator core 100 and the winding wire 20 constitute a stator 10 (armature) as an example of an armature.

Reference numeral 30 is a cylindrical rotor magnet as an example of a field magnet. The rotor magnet 30 is rotatably and coaxially provided with respect to the stator 10 so that the inner peripheral surface thereof faces the outer peripheral surface of the stator 10 in the radial direction. The inner circumference side of the rotor magnet 30 constitutes 6 poles of alternating polarities, and the poles are substantially evenly arranged in a circle at a central angle of 60 degrees. The N pole and the S pole in the MGs of FIGS. 1 and 6 indicate the polarities on the inner peripheral side of the rotor magnet 30, respectively. Note that FIG. 6 corresponds to the case where the stator 10 and the rotor magnet 30 have the positional relationship shown in FIG.

Next, referring to FIG. 1, an arrangement state of the crimp portions 61 to 63 in the stator 10 will be examined. With respect to the first-phase coil 201, only the stator tooth 101 has the crimped portion, and the other two stator teeth 104 and 107 do not have the crimped portion. With respect to the second phase coil 202, only the stator tooth 105 has a crimp portion, and the other two stator teeth 102 and 108 do not have a crimp portion. Further, in relation to the coil of the third phase, only the stator tooth 106 has the crimped portion, and the other two stator teeth 103 and 109 do not have the crimped portion. That is, each phase has one caulking part. Therefore, each phase of the winding wire 20 has a substantially uniform inductance and the magnetic resistance to the rotor magnet 30 is substantially the same, so that torque ripple can be reduced and uneven rotation can be reduced. ..

In the motor of this embodiment, an insulated copper wire having a diameter of 0.14 mm was used, and the inductance waveform of the motor having 70 turns of winding per slot was as shown in FIG. The waveforms show A between the first phase and the second phase, B between the second phase and the third phase, and C between the third phase and the first phase.

On the other hand, the inductance waveform of a conventional motor (shown in FIG. 5) in which an insulated copper wire having a diameter of 0.14 mm is used and a winding of 70 turns per slot is shown in FIG. became. Also in this case, the waveform shows A between the first phase and the second phase, B indicates the second phase and the third phase, and C indicates the third phase and the first phase. As is apparent from FIG. 7, only the waveform A that does not include the third phase (that is, the phase of the winding having the crimped portion on the magnetic pole portion) is in a more protruding state than the other waveforms B and C. Therefore, it can be seen that the inductance in this conventional motor greatly varies depending on the winding phase.

Next, the torque waveform of the motor of this embodiment is shown in FIG. 3 using the above-mentioned winding. In this case, the maximum and minimum torques were 230 g-cm and 170 g-cm, respectively. On the other hand, the torque waveform of the conventional motor (shown in FIG. 5) is as shown in FIG. The maximum and minimum torques in this case were 240 g-cm and 155 g-cm, respectively. As described above, the motor according to the present embodiment slightly reduces the maximum torque due to the difference in the number of caulking portions, as compared with the conventional motor, but improves the actual torque due to the increase in the minimum torque. Is getting Further, as is clear from FIGS. 3 and 8, it can be seen that the uneven rotation is also reduced.

Next, FIG. 4 is a schematic plan view showing another embodiment of the motor according to the present invention, and particularly showing the arrangement of the caulking portion provided on the stator 10. Therefore, windings and the like are omitted. In FIG. 4, the rotor magnet 30 has 12 poles of alternating polarity, and since the rotor magnet 30 has the same function and effect as already described, the description thereof will be omitted. In any of the above-described embodiments, the caulking portion provided on the stator 10 is arranged substantially opposite to the rotation axis. That is, the caulking portion 61 provided on the first magnetic pole, the caulking portion 62 provided on the fifth magnetic pole, and the caulking portion 63 provided on the sixth magnetic pole are arranged substantially opposite to each other. .. Therefore, the stator core is not substantially affected by the shape distortion or the like with respect to the pressure applied when the stator core plate is crimped.

In the motor of the present invention, the effective value of the torque can be increased by increasing the number of windings of the winding 20 to improve the torque constant. Even in that case, the torque ripple can be suppressed to a low level. In the present embodiment, the stator tooth 101 of the stator 10 is defined as the first magnetic pole in the clockwise direction of the rotating shaft, but the stator tooth 101 is not limited to this, and any stator tooth may be defined as the specific first magnetic pole. And may be defined as either clockwise or counterclockwise. Further, as the caulking method for the caulking portion, the example of the pack caulking has been described, but it goes without saying that other caulking means known per se may be used.

[0021]

【effect】

 In the motor of the present invention, since the crimping portion of the stator core is provided on the first magnetic pole portion, the fifth magnetic pole portion and the sixth magnetic pole portion, torque ripple is small and therefore the effective value of torque is increased. It is possible to obtain a motor with less uneven rotation.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a motor according to an embodiment of the present invention.

FIG. 2 is an inductance waveform diagram of a motor according to an embodiment of the present invention.

FIG. 3 is a torque waveform diagram of a motor according to an embodiment of the present invention.

FIG. 4 is a schematic plan view of a motor according to a second embodiment of the present invention.

FIG. 5 is a schematic plan view of a conventional motor.

FIG. 6 is a conceptual development view of a conventional motor.

FIG. 7 is an inductance waveform diagram of a conventional motor.

FIG. 8 is a torque waveform diagram of a conventional motor.

[Explanation of symbols]

 10 stator (armature) 20 winding 30 rotor magnet 61-63 caulking part 100 stator core 101-109 stator tooth 201-203 coil

Claims (1)

[Claims for utility model registration] [Claim 1] There are nine magnetic poles, and one of these magnetic poles is provided.
A motor having an armature around which a type 1 coil is wound, and a field means of 6 poles or 12 poles of alternating polarity provided so as to be rotatable relative to the armature, wherein the armature is laminated. The core plates are crimped and integrally formed.
Each of the three magnetic pole portions has a crimp portion that is crimped at one place. These crimp portions include a first magnetic pole portion, a fifth magnetic pole portion, and a sixth magnetic pole portion of the armature. And a magnetic pole part of the motor.