JPS6363084U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a three-phase radial gap type inner rotor type brushless motor as a first embodiment of the present invention, Fig. 2 is a cross-sectional view of the same brushless motor, and Fig. 3 is a cross-sectional view of the same brushless motor. Figure 4 is a perspective view of the field magnet, Figure 4 is a perspective view of the magnetic material for induction, and Figure 5 is a perspective view of the field magnet.
The figure is an explanatory diagram of the case where a magnetic material for induction is fixed to a field magnet, and Figure 6 is a developed diagram of a field magnet and a stator armature, as well as a magnetic encoder circuit diagram.
Figure 7 is a magnetic encoder circuit diagram adopted as the second embodiment, Figures 9a and b are output signals of the magnetic encoder obtained from the output terminals of the magnetic encoder circuit, and Figures 10a and b are Figure 9a. , b, Fig. 10 c is an output signal in the CW direction, Fig. 10 d is an output signal in the CCW direction, Fig. 11 is an up-edge detection circuit and CW, CCW.
Direction detection circuit (direction discrimination circuit), Figure 12 is an explanatory diagram of how to electrically increase resolution, Figure 12a
,b correspond to Figure 10a and b, and Figure 10c corresponds to Figure 10a and b.
, d are the output signals corresponding to Fig. 10 c and d;
Figure 3 is a perspective view of the magnetic material for induction used as the third embodiment, Figure 14 is a developed view of the magnetic material sheet for induction forming the magnetic material for induction, and Figure 15 is the fourth embodiment. It is a perspective view of the magnetic material for dimagnetism used as a. (Explanation of symbols), 1...Brushless motor, 2
...Motor housing, 3...Stator armature,
4... T-shaped salient pole, 5-1,..., 5-6... Armature coil, 6, 6-1,..., 6-3... Magnetoelectric conversion element, 7... Rotating shaft, 8, 9 ...Bearing, 10...
Rotor yoke, 11...Field magnet, 12...
...Magnetic material for dimagnetism, 13...Ring-shaped connecting part, 14
, 14-1, ..., 14-8... magnetic pole piece for magnetic induction, 1
5...Slit, 16...Printed wiring board, 1
7... IC for energization control circuit, 18,..., 29...
Terminal, 30, 31... Output terminal, 32... Magnetic material for dimagnetism, 33... Magnetic material forming sheet for dimagnetism, 34
...Slit, 35...Ring-shaped connecting portion, 36...
...Pole piece for magnetic induction, 37, 38...End part, 39...
Magnetic material for dimagnetism, 40...Cup-shaped magnetic material, 41...
...Top end, 42...Through hole, 43...Ring-shaped connecting portion, 44, 45...Slit, 46...Magnetic pole piece, 47...Magnetic encoder circuit, 48...IC for magnetic encoder circuit, 49...Output terminal, 5
0... Output signal, 51... Operational amplifier, 52...
Feedback resistor, 53... Magnetic sensor for magnetic encoder, 54, 55... Output terminal, 56, 5
7...Operation amplifier, 58, 59...Output signal, 6
0... Up/edge detection circuit and CW/CCW direction detection circuit (direction discrimination circuit), 61, 61'...
CW direction output signal, 62, 62'...CCW direction circuit output signal.

Claims (1)

[Claims for Utility Model Registration] (1) 2P facing the stator armature through an air gap, with N and S magnetic poles alternating with a width of 180 degrees in electrical angle.
(P is an integer of 2 or more) In a brushless motor that rotatably supports a field magnet, a width of approximately 180 degrees in electrical angle is used to induce the N and S magnetic poles of the field magnet. 2P magnetic pole pieces for induction made of the formed magnetic material are fixed to the field magnet, a magnetoelectric conversion element is arranged on the fixed side opposite to the magnetic pole piece for induction, and a signal from the magnetoelectric conversion element is The magnetic sensor for the magnetic encoder is equipped with an energization control circuit that energizes the armature coil of the stator armature in a predetermined direction based on the above-mentioned magnetic field, and detects the magnetic pole of the magnetic pole piece for magnetic induction and outputs a magnetic encoder signal. It is arranged opposite to the magnetic pole piece.
brushless motor. (2) The above-mentioned magnetic encoder magnetic sensor is located at a position facing the above-mentioned magnetizing magnetic pole piece at an electrical angle of 9
A brushless motor with a built-in magnetic encoder according to claim (1) of the utility model registration, which comprises two brushless motors arranged at positions shifted by 0·(n·360) degrees. (3) The above-mentioned one or more magnetic sensors for magnetic encoders utilize any one of the magnetoelectric transducers selected as the above-mentioned position detection elements as a magnetic sensor for magnetic encoders, and the utility model registration claims 1.
A brushless motor with a built-in magnetic encoder as described in item (1) or item (2). (4) The above-mentioned 2P magnetizing magnetic pole pieces are connected at one end portion fixed to the above-mentioned field magnet.
A brushless motor with a built-in magnetic encoder as described in any of paragraph 3). (5) The brushless motor with a built-in magnetic encoder according to claim 4, wherein the 2P magnetic pole pieces and the portion connecting them are integrally formed of a magnetic material. (6) The induction magnetic body having the above-mentioned 2P magnetic induction pole pieces is cylindrical, and a ring-shaped connecting portion is formed at one end of the magnetic body, and the connecting portion is connected to a field magnet. A brushless motor with a built-in magnetic encoder according to claim (4) of the utility model registration, which is fixed to one end of the brushless motor. (7) The above-mentioned cylindrical magnetizing magnetic body has a part other than one end of the sheet-shaped magnetic body that has an electrical angle of approximately 180 degrees.
Approximately 18 degrees electrical angle is formed by forming slits at intervals of 18 degrees.
A built-in magnetic encoder according to claim (6) of the registered utility model, which is formed by forming 2P magnetic pole pieces for magnetic induction with a width of 0 degrees, rolling them into a cylindrical shape, and fixing them to one end of a field magnet. brushless motor. (8) The magnetizing magnetic body having the above-mentioned 2P magnetizing magnetic pole pieces is cup-shaped, and a connecting portion is formed at the end surface, and a portion extending from the end surface to the circumferential surface is cup-shaped. Slits are formed at intervals of approximately 180 degrees in electrical angle to form 2P magnetic pole pieces for magnetic induction with a width of approximately 180 degrees in electrical angle, and the connecting portion of the end face is connected to the end of the field magnet. A brushless motor with a built-in magnetic encoder according to claim (5) of the utility model registration, which is fixed. (9) The brushless motor is a radial gap type, cylindrical, low inertia inner rotor motor, and the magnetism according to any one of claims (1) to (8) of the scope of utility model registration claims. Brushless motor with built-in encoder.