JPH1169751A - Polyphase motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyphase motor having a rotor position sensor in which no electronic part, e.g. a capacitor, is employed in a sensor circuit built in the motor. SOLUTION: The polyphase motor comprises a stator 11 having a plurality of salient poles directing inward, a winding 14 applied to the salient pole 13, and a rotor pole 17 of a plurality of permanent magnets having polarity repeating alternately wherein the salient pole 13 comprises a torque pole, and a sensor pole for detecting the rotor position. The number of the stator salient poles 13 is 13a where (a) is an integer of 1 or above, the number of the sensor poles is 8k where k (k<=a) is an integer of 1 or above, and the number of the rotor poles is 18a. Sensor winding of the sensor pole is divided into four sensor groups and connected such that the detection output signal in each group is maximized and the induced voltage is minimized. Torque winding of the torque electrode is divided into torque groups of same number as the phases and connected such that the induced voltage in each group is maximized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyphase motor with a rotor position sensor, and more particularly, to a polyphase brushless motor having a sensor pole for detecting a rotor position.

[0002]

2. Description of the Related Art Conventionally, as a motor with a rotor position sensor of this type, for example, a sectional view of FIG.
(A) is a cross-sectional view of a stator configuration, and (b) of FIG. 13 is a cross-sectional view of a rotor configuration). According to FIG. 13, the motor m includes a stator 1, a rotor 2, and windings 3 wound around a plurality of (20 in the figure) salient poles 3 that generate torque on the rotor 2. And a rotor position sensor 5 including coils Sa, Sb, Sc, and Sd wound around a plurality of (four in the figure) salient poles 3 for detecting the rotation angle of the rotor 2. ing.

[0003] A plurality of stators 1 (two in FIG. 1) are radially arranged at an equal pitch angle toward the inside of the iron core 1a.
(4) salient poles 3. The rotor 2 includes the stator 1
On the center axis of the stator 1, the outer peripheral surface thereof is disposed so as to face the salient pole 3 via an air gap with the inner peripheral surface of the stator 1, and both ends of the shaft 6 are turned by brackets and bearings (not shown). It is movably supported. On the outer circumferential surface of the rotor core 2a, a plurality of (9 pairs, ie, 18 in the figure) rotor poles 7 of the permanent magnet are arranged along the outer circumferential surface so as to face the salient poles 3. Are arranged alternately and repeatedly. In this case, the ratio between the number of salient poles of the stator 1 and the number of rotor poles of the rotor 2 is 4: 3 (in some cases, 4: 5).

[0004] Of the 24 salient poles 3 of the stator 1, 2
A winding 4 for torque generation is wound around the zero salient poles 3, and the windings 4 are connected in two phases, that is, A phase, reverse A phase, B phase, and reverse B phase. Are formed. Rotor position sensor coils Sa, Sb, Sc, Sd are wound around the remaining four salient poles 3 of the stator 1 and are connected to two pairs of sensor circuits 8a, 8b. The rotation angle position sensor 5 including the salient poles 3 is formed.

The sensor 5 includes two sets of sensor circuits 8a.
, 8b is connected to coils Sa, Sd wound around the first pair of the two pairs of salient poles 3, and the other 8a is connected to the other pair.
b is connected to the coils Sb and Sc wound around the second pair of the two pairs of salient poles 3, and each of the coils Sa and Sb
, Sc and Sd are 75 degrees between the coils Sa and Sc (pitch angle for 5 salient poles), 90 degrees between the coils Sc and Sb (pitch angle for 6 salient poles), and 105 degrees between the coils Sb and Sd. (7
Pitch between salient poles), and 90 degrees between coils Sd and Sa (6
At a pitch angle of salient poles). (JP-A-62-244265)

A pair of coils Sa, Sd of the sensor 5
And Sb, Sc are called a sine coil pair and a cosine coil pair, respectively, and these coils Sa, Sd
And between S and Sc, there is a phase difference of 180 degrees in electrical angle so that the inductance change becomes a differential coupling, and between the two coil pairs Sa, Sd and Sb, Sc, there is a rotation angle voltage. The signal is formed so that the phase difference of the signal becomes 90 degrees. Then, a rotation angle position sensor 5 comprising two sets of detection channels for generating a detection signal of the rotor rotation angle from the inductance change of the pair of coils Sa, Sd and Sb, Sc is formed. .

The sine coil pairs Sa, S of the sensor 5
d and the connection of the cosine coil pairs Sb and Sc are shown in FIG.
As shown in FIG. 3 (a), an external AC power supply is excited by an AC voltage having a frequency of about 100 kHz via terminals e1 and e2. The outputs of the midpoint potential terminals E1 and E2 at the connection points of the coil pairs Sa and Sd and Sb and Sc have the rotation angle θ of the rotor 2 as one variable, and are represented by the sine and cosine functions of θ, respectively. Has been given. The outputs of the midpoint potential terminals E1 and E2 are extracted as rotation angle voltage signals having the rotation angle θ of the rotor 2 as a variable. By performing an operation on these values, the rotation angle of the rotor 2 is calculated. The rotation angle of the rotor 2 calculated here is an electrical angle, and is actually calculated by
This is converted to a mechanical angle.

[0008]

However, in the case of the conventional motor m, when the sensor circuits 8a and 8b are formed inside the motor m for detecting the position of the rotor, it is shown in FIG. So that the sensor circuits 8a, 8b
A capacitor 9 which is some electronic component is used. That is, when the motor m rotates, an induced voltage is generated in the sensor coil. In the case of FIG. 13A, if a capacitor is not used for the sensor circuits 8a and 8b, a return current is generated in the sensor circuits 8a and 8b, so that the detection accuracy of the sensors deteriorates. Further, a voltage difference is generated between the input terminals e1 and e2 and between the output terminals E1 and E2 of the sensor circuits 8a and 8b due to the induced voltage of the sensor coil. This voltage difference increases as the motor rotates at a higher speed, so that a malfunction or a failure of the motor control system may occur.

Usually, when these capacitors are used in a high temperature environment, the characteristics of the capacitors become unstable,
It may cause a failure. As a result, in a high-temperature environment, there is a problem that the reliability and durability of the motor m are adversely affected.

[0010] The present invention has been made in view of such a point,
The purpose is to solve the above-mentioned problems, and to combine the number of salient poles of the stator and the number of rotor poles of the rotor, and the number of sensor windings wound around the sensor poles and the torque windings wound around the torque poles. An object of the present invention is to provide a multi-phase motor with a rotor position sensor that does not use any electronic component such as a capacitor in a sensor circuit inside the motor by connection.

Another object of the present invention is to optimize the arrangement of the sensor poles and the torque poles and their respective shapes, so that a sensor circuit inside the motor has no rotor or other electronic components such as a rotor position sensor. An object of the present invention is to provide a phase motor.

[0012]

According to the present invention, there is provided a stator having a plurality of salient poles radially inwardly arranged at an equal pitch angle, and comprising a plurality of salient poles. And a plurality of permanent windings disposed so as to face the salient poles via an inner circumferential surface and a gap of the stator, the polarity of which is alternately repeated along the outer circumferential surface. A rotor having a magnet's rotor pole and rotatably supported, and the stator salient pole comprises a torque pole for generating torque and a sensor pole for detecting the rotor position. The following is a description of a multi-phase motor with a rotor position sensor.

(1) The number of the stator salient poles is 16a when a is an integer of 1 or more, and the number of sensor poles is k where k is an integer of 1 or more and k ≦ a. Time 8
The number k of rotor poles is 18a.

(2) In the above (1), the sensor winding wound around the sensor pole is divided into four sensor groups, the detection output signal in each group is maximized, and the induction in each group is induced. Connected to minimize the voltage,
The torque winding wound around the torque pole is divided into the same number of torque groups as the number of phases, and the induced voltage in each group is maximized, and the phase difference of the induced voltage between the groups is the number of phases ( 2 or 4) are connected so as to be 180 degrees.

(3) The number of the stator salient poles is 16, of which the number of the sensor poles is 8, and the number of the rotor poles is 18. The sensor poles are arranged at a constant pitch angle of 45 ° mechanical angle. The remaining eight torque poles of the same shape provided are of the same shape disposed at the center position between each of the sensor poles, and the shape of the torque pole and that of the sensor pole are the same. The shape is not necessarily the same, and the eight sensor windings wound around the respective sensor poles are divided into four sensor groups, and the two sensor windings of each group have a mechanical angle of 180 ° with respect to each other. The eight torque windings disposed at the positions and connected so that the induced voltage in each group is minimized, and wound around the torque pole are divided into two torque groups, and The induced voltage is the maximum and the induced voltage between each group is Phase difference is equal to or a rotor position two-phase motor with sensors connected to be 90 °.

Since the present invention is constructed as described above, the combination of the number of salient poles of the stator and the number of rotor poles of the rotor, the number of sensor windings wound on the sensor poles, and the number of windings on the torque poles are increased. It can be performed by the configuration of the torque winding to be performed and the connection thereof. Then, the sensor pole and the torque pole are separated, and the shape of the sensor pole and the shape of the torque pole can be optimally designed.

[0017] Therefore, optimum magnetic characteristics are provided for both the rotor position detecting function and the output of the motor. In addition to this, high-precision position detection of the rotor and high output of the motor are realized, and the total number of salient pole windings on the stator is reduced as much as the number of salient poles on the stator. A highly reliable, highly durable multi-phase motor with a rotor position sensor having excellent productivity can be realized.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

(First Embodiment) FIGS. 1 to 5 show a first embodiment of a multi-phase motor with a rotor position sensor according to the present invention. FIG. k
FIG. 4 is a connection diagram of the stator in the case of the two-phase motor M1 in which the value of (k ≦ a) is a = k = 1, and shows the connection of the winding wound around the torque pole and the winding wound around the sensor pole. FIG. 2
Is a sectional view of the stator core of FIG. 1, and FIG. 3 is a sectional view of the rotor. 1, the same members as those in FIG. 13 are denoted by the same reference numerals, and the description thereof will be omitted.

1 to 3, the stator 11 of the two-phase motor M1 with the rotor position sensor has 16 stators (16a = 1) radially arranged inward at an equal pitch angle.
Of the salient poles of 6), eight (8k = 8) sensor poles for detecting the rotor position and eight for generating the torque.
It consists of torque poles.

The two-phase motor M1 is connected to the stator 11
, A rotor 12, windings 14 wound around a plurality of (eight in the figure) salient poles 13 for generating torque on the rotor 12, and a rotation angle of the rotor 12. A rotor position sensor 15 including a coil S wound around a plurality of (eight in the figure) salient poles 13 is provided.

The rotor 12 is disposed on the center axis of the stator 11 such that an outer peripheral surface thereof faces the salient pole 13 via an inner peripheral surface of the stator 11 and a gap. Both ends of the shaft 16 are rotatably supported by brackets and bearings (not shown). The outer peripheral surface of the rotor core 12a has a plurality (18a = 18, ie, 9 pairs,
The rotor poles 17 made of permanent magnets magnetized in the radial direction are arranged so as to face the salient poles 13 and alternately repeat the polarity thereof along the outer peripheral surface. Therefore, the ratio of the number of salient poles of the stator 11 to the number of poles of the rotor is 8/9.

The stator 11 has an iron core 11a formed by laminating electromagnetic steel thin plates, and eight salient poles P1, P3, P5, P7, P9, P11, P13, P15 disposed inside.
Are the sensor poles, and eight salient poles P2, P4, P6, P8,
P10, P12, P14, and P16 are torque poles.

The eight sensor poles P1, P3,.
The sensor coils wound around P15 are divided into four sensor groups, and each group is connected so that the detection output signal of the sensor coil is maximized and the induced voltage in each group is minimized. For example, the first group is a sensor pole P
The first group is composed of P3 and P11, the third group is composed of P5 and P13, and the fourth group is composed of P7 and P15.

The eight torque poles P2, P4,.
The torque windings wound around ‥ and P16 are divided into two groups, and are connected such that the induced voltage of each group is maximized and the phase difference of the induced voltage between the groups is 90 °. For example, group A has torque poles P2, P4, P1.
0, P12 and B groups are torque poles P6, P8, P14, P1
Consists of six.

FIG. 4 is a vector diagram of the induced voltage of the torque pole winding when the two-phase motor M1 with the rotor position sensor according to the present embodiment is connected as shown in FIG. In this case, the voltages induced in the torque windings wound around the eight torque poles P2, P4,..., P16 are V2, V4,
Ｖ, V16, phase voltages VA, A, B of group A, B
VB is VA = V2 + V4-V10-V12 and VB = V6 + V8-V14-V16, respectively, and the phase voltages VA and VB have a phase difference of 90 degrees electrically.

FIG. 5 shows the motor M of this embodiment as shown in FIG.
FIG. 4 shows a vector diagram of an induced voltage of the sensor pole coil when the connection is made as shown in FIG. In each sensor group, the first group of sensor poles P1 and P9 and the second group of sensor poles P
3 and P11, the induced voltages of the sensor poles P5 and P13 of the third group, and the induced voltages of the sensors P7 and P15 of the fourth group are respectively induced voltage of the first sensor group = V1 + V9 = 0, induced voltage of the second sensor group = V3. + V11 = 0, induced voltage of the third sensor group = V5 + V13 = 0, induced voltage of the fourth sensor group = V7 + V15 = 0, whereby the induced voltages of the four sensor groups are all zero. Therefore, the sum of the induced voltages in the loop formed by the sensor coil becomes zero. Therefore, no return (circulating) current is generated in the loop formed by the sensor coil.

As a result, a capacitor, which is an electronic component, for suppressing the return current of the sensor circuit inside the conventional multi-phase motor m having a rotor position sensor due to an induced voltage as shown in FIG. Not required. In addition, since the induced voltage generated between any of the terminals of the four sensor groups is also zero, even when the motor m rotates at a high speed, the excitation circuit of the sensor and the processing circuit of the sensor signal have a dangerous induced voltage. No voltage is possible. For this reason,
No capacitor is required between the sensor and the sensor excitation circuit and between the sensor and the sensor signal processing circuit, which is an electronic component for cutting off a dangerous induced voltage.

Generally, a certain degree of eccentricity of the rotor occurs in the motor production process. The eccentricity of the rotor has a bad influence on the rotor position detection of the sensor. However, another major feature of the multi-phase motor M1 with the rotor position sensor according to the present embodiment is that since the mutual positions of the sensor poles of each group are mechanically arranged at 180 °, the mutual arrangement of the sensor coils is not limited. By the action, the influence of the eccentricity of the rotor on the sensor characteristics is suppressed, and stable rotor position detection characteristics can be obtained. Further, since the poles of each torque group are symmetrically arranged with respect to the center of the motor, the unbalance force in the radial direction due to the electromagnetic force is zero even in any state during operation of the motor M. The motor M1 can rotate very smoothly.

FIG. 6 is a block diagram showing an operation control system applied to the motor M1 of the present embodiment. Referring briefly to FIG. 6, two-phase power is supplied from amplifiers HA and HB to the A-phase and B-phase of the two-phase motor M1 with the rotor position sensor, respectively. The oscillation circuit 41 supplies 100 kHz to the terminals e1 and e2 of the bridge circuit of the sensor.
A high-frequency signal of about z is supplied, and the change in the inductance of the sensor poles P1, P3,..., P15 due to the rotation of the rotor 12 has a phase difference of π / 2. The two sine wave signals that change with the signals are connected to terminals E1 and E1.
Output from 2. The two sine wave signals are converted into a sine function and a cosine function of the rotation angle of the rotor 12 by the synchronous detection circuit 42, and are converted into a rotor angle signal by the position decoder 43. An external reference signal input to 44 or a reference signal output from the microprocessor 45 is added by an adder circuit 46, and output to PID control circuits 47, 48, and 49 to perform well-known digital PID control.

(Second Embodiment) FIGS. 7 to 11 show a second embodiment of a multi-phase motor with a rotor position sensor according to the present invention. FIG. The two-phase motor M in which the value of k (k ≦ a) is a = 2 and k = 1
2 is a connection diagram of the stator configuration, showing the connection of the winding of the torque pole and the connection of the coil of the sensor pole. FIG. 8 is a cross-sectional view of the stator core of FIG. 7, and FIG. 9 is a cross-sectional view of the rotor. is there. 7, the same members as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

7 to 9, the stator 21 of the two-phase motor M2 with the rotor position sensor has 32 stators (16a = 3a) radially arranged inward at an equal pitch angle.
Of the salient poles 2), eight (8k = 8) sensor poles for detecting the rotor position and two for generating the torque
It consists of four torque poles.

The two-phase motor M2 is connected to the stator 21
, A rotor 22, windings 24 wound around a plurality of (24 in the figure) salient poles 23 for generating a torque in the rotor 22, and a rotation angle of the rotor 22. A plurality of (eight in the figure) salient poles are wound around the rotor S and the rotor position sensor 25 is composed of coils S.

The rotor 22 is disposed on the center axis of the stator 21 such that the outer peripheral surface thereof faces the salient pole 23 via a gap with the inner peripheral surface of the stator 21. Both ends of the shaft 26 are rotatably supported by brackets and bearings (not shown). A plurality (18a = 36 pieces, that is, 18 pairs, 3
(Six) rotor poles 27 made of permanent magnets magnetized in the radial direction are arranged opposite to the salient poles 23 and alternately repeat the polarity thereof along the outer peripheral surface. Therefore, the ratio of the number of salient poles of the stator 21 to the number of poles of the rotor 22 is 8 /
9

The stator 21 has an iron core 21a formed by laminating electromagnetic steel thin plates, and has eight salient poles P1, P3, P5, P7, P17, P19, P21, P23 disposed inside.
Are the sensor poles and 24 salient poles P2, P4, P6, P8
P16, P18, P20, P22, P24 to P32 are torque poles.

The sensor coils wound around the eight sensor poles P1, P3,... Are divided into four sensor groups, each group maximizing the detection output signal of the sensor coil and within each group. Are connected so as to minimize the induced voltage. For example, the first group consists of the sensor poles P1 and P
17, the second group is composed of P3 and P19, the third group is composed of P5 and P21, and the fourth group is composed of P7 and P23.

The 24 torque poles P2, P4,.
Are divided into two groups and are connected such that the induced voltage of each group is maximized and the phase difference of the induced voltage between each group is 90 °.
For example, group A has torque poles P2, P10, P18, P2
6, P9, P25, P11, P27, P4, P12, P20, P2
8, Group B is P6, P14, P22, P30, P13, P2
9, P15, P31, P8, P16, P24 and P32.

FIG. 10 shows a vector diagram of the induced voltage of the torque pole winding when the two-phase motor M2 with the rotor position sensor of this embodiment is connected as shown in FIG. In this case, the voltages induced in the torque windings wound around the 24 torque poles P2, P4,.
‥, the phase voltages VA and VB of the A and B groups are respectively given by: VA = V2−V10 + V18−V26 + V9 + V25 + V11 + V
27 + V4-V12 + V20-V28, VB = V6-V14 + V22-V30 + V13 + V29 + V15 + V
31 + V8−V16 + V24−V32, and the phase voltages VA and VB have an electrical phase difference of 90 °.

FIG. 11 shows the motor M2 of this embodiment,
FIG. 8 shows a vector diagram of an induced voltage of the sensor pole coil when the connection is made as in FIG. 7. The first in each sensor group
The induced voltages of the sensor electrodes P1 and P17 of the group, the sensor electrodes P3 and P19 of the second group, the sensor electrodes P5 and P21 of the third group, and the induced voltages of the sensors P7 and P23 of the fourth group are respectively: V1−V17 = 0, induced voltage of the second sensor group = V3−V19 = 0, induced voltage of the third sensor group = V5−V21 = 0, induced voltage of the fourth sensor group = V7−V23 = 0, As a result, all the induced voltages of the four sensor groups become zero, so that the sum of the induced voltages in the loop formed by the sensor coils becomes zero. Therefore, no return (circulating) current is generated in the loop formed by the sensor coil.

Thus, similar to the first embodiment, FIG.
A capacitor, which is an electronic component, for suppressing the return current of the sensor circuit inside the conventional multi-phase motor m with the rotor position sensor as shown in FIG. In addition, since the induced voltage generated between any of the terminals of the four sensor groups is also zero, a capacitor as an electronic component for cutting off the dangerous induced voltage is not required.

(Third Embodiment) FIG. 12 is a sectional view of a stator core showing a third embodiment of the present invention. In FIG. 12, the size of the two-phase motor M3 with the rotor position sensor of this embodiment is 28 mm × 28 mm in length and width, and 26 mm in total length.
The iron core 31a of the stator 31 is formed by stacking silicon steel plates, and has an outer diameter of 28 mm.

The stator 31 is provided with sensor poles P1, P2 for detecting the positions of eight narrow rotors of the same shape which are radially provided on the surface facing the rotor (not shown) at a pitch of 45 ° mechanical angle. P3, P5, P7, P9, P11, P13, P15
And the sensor poles P1, P3,..., P15 are respectively disposed at the center positions between the sensor poles P1, P3,.
Poles P2, P4, P6, P8, P for generating eight torques of the same shape having a wide width provided at a pitch of
10, P12, P14, P16, and the respective torque poles P2, P4
,..., P16 and the adjacent sensor poles have a mechanical angle of 22.5 ° with respect to each other.
Six salient poles are provided.

The sensor poles P1, P3 of the stator 31
,..., P15 are wound with sensor coils, the torque poles P2, P4,..., P16 are wound with torque windings, and the rotor is made up of 18 rotors composed of permanent magnets. A pole is provided. The shapes of the sensor pole and the torque pole are not necessarily the same, and the sensor poles P1, P3,.
Are formed in a shape for detecting the rotor position with high accuracy, and the shapes of the torque poles P2, P4,... Are formed so as to maximize the output of the motor M3.

In this type of two-phase motor with a rotor position sensor, a stator is provided with a sensor pole. It is necessary to form the magnetic flux density of the sensor pole for detecting the position of the rotor up to the saturation region. However, when the magnetic flux density of the torque pole is formed up to the saturation region, when the motor rotates at a high speed, there is a problem that iron loss of the motor increases and efficiency of the motor deteriorates.

For this reason, the motor M3 of this embodiment is
As shown in FIG. 12, the shapes of the sensor poles P1, P3,... And the torque poles P2, P4,.
The width of the sensor poles P1, P3,.
By making the width narrower than 2, P4, ‥‥‥, the sensor pole can be operated in an appropriate magnetic saturation region, and the torque pole can be operated in an unsaturated region. In particular, the magnetic flux density of the sensor poles P1, P3,.
The most excellent sensor detection accuracy was obtained. Further, the magnetic flux density of the sensor pole is set to 1.5T to 1.9.
During T, a practical and good sensor detection function was obtained.

Further, by forming the width of the sensor poles P1, P3,... Narrower than the width of the torque poles P2, P4,. Therefore, the electric resistance of the torque pole winding can be reduced, and the current capacity of the winding can be increased. For this reason, a high-output and high-efficiency polyphase motor with a rotor position sensor can be realized. As the motor M3 of this embodiment, a motor having the above-mentioned output of 15 W was realized. This is a large output compared to the output of a conventional motor of the same size.

According to the multi-phase motor with the rotor position sensor described in each embodiment, the following effects can be obtained. (1) Due to a special combination of the number of poles of the stator and the number of poles of the rotor, and the connection between the sensor coil and the torque winding, no capacitor as an electronic component is used in the rotor position detection circuit inside the motor. Therefore, the motor can detect the rotor position with high accuracy not only in a general temperature environment but also in a high temperature environment, and can realize the motor with high productivity.

(2) The sensor pole and the torque pole can be symmetrically separated, and the shape and the magnetic characteristics of the sensor pole and the torque pole can be optimally formed. Provides optimal characteristics for both function and output. In addition, due to the special arrangement position of the sensor coils, the influence of the eccentricity of the rotor on the sensor characteristics is suppressed by the interaction of the sensor coils of each group, and the rotor position can be detected with high accuracy.

(3) Since the poles of each torque group are arranged symmetrically with respect to the center of the motor, the unbalance force in the radial direction due to the electromagnetic force can be maintained in any state during operation of the motor. It becomes 0. Thus, the motor can rotate very smoothly. In addition to these, it is possible to realize the highly accurate position detection of the rotor and the high motor output and to provide the motor with high productivity, high reliability and high durability.

Note that the technique of the present invention is not limited to the technique in the above-described embodiment, but may be implemented by means of other modes that perform the same function. Can be changed or added.

[0051]

As is clear from the above description, according to the polyphase motor with the rotor position sensor of the present invention, the number of stator salient poles is 16a when a is an integer of 1 or more. Is the number of sensor poles, k is an integer of 1 or more, and k ≦
Since the number of rotor poles is 8k and the number of rotor poles is 18a, a highly reliable and highly durable rotor position sensor can be used without using any electronic components such as capacitors in the sensor circuit inside the motor. A multi-phase motor can be realized.

According to the two-phase motor with the rotor position sensor of the present invention, the number of stator salient poles is 16, of which the number of sensor poles is 8, and the sensor pole has a mechanical angle of 45 °.
And the other eight torque poles are respectively disposed at central positions between the respective sensor poles, and
Each of the eight sensor windings is divided into four sensor groups, and the two sensor windings of each group have a mechanical angle of one
Each of the eight torque windings is located at 80 ° and connected so that the induced voltage in each group is minimized.
It is divided into two torque groups and connected so that the induced voltage in each group is maximum and the phase difference of the induced voltage between each group is 90 °. Thus, it is possible to realize a highly reliable and highly durable two-phase motor with a rotor position sensor that does not require the use of any electronic component such as a capacitor.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a multi-phase motor with a rotor position sensor according to the present invention, wherein integers a and k (k ≦ a) of 1 or more are two-phase motors where a = k = 1. FIG. 3 is a connection diagram of the stator configuration of FIG.

FIG. 2 is a sectional view of the stator core of FIG. 1;

FIG. 3 is a sectional view of a rotor.

FIG. 4 is a vector diagram showing an induced voltage of a torque pole winding when the connection is made as shown in FIG. 1;

FIG. 5 is a vector diagram showing an induced voltage of a sensor pole coil when the connection is made as shown in FIG. 1;

FIG. 6 is a configuration diagram of an operation control system applied to the motor M of the present embodiment.

FIG. 7 is a second embodiment of the multi-phase motor with a rotor position sensor according to the present invention, wherein the integers a and k (k ≦ a) of 1 or more are a = 2 and k = 1. FIG. 6 is a connection diagram of a stator configuration in the case of FIG.

FIG. 8 is a sectional view of the stator core of FIG. 7;

FIG. 9 is a sectional view of a rotor.

FIG. 10 is a vector diagram showing an induced voltage of a torque pole winding when the connection is made as shown in FIG. 7;

FIG. 11 is a vector diagram showing an induced voltage of a sensor pole coil when the connection is made as shown in FIG. 7;

FIG. 12 is a sectional view of a stator showing a third embodiment of the present invention.

13A and 13B are cross-sectional views of a two-phase DC motor having a built-in rotor position sensor as a conventional motor with a rotor position sensor, and FIG.
(B) is a sectional view of a rotor configuration.

[Explanation of symbols]

1,11,21,31 Stator 1a, 11a, 21a, 31a Stator core 2,12,22 Rotor 3,13,23 Salient pole 4,14,24 Winding 5,15,25 Rotor position sensor 6 , 16, 26 axis 7, 17, 27 Rotor pole 8a, 8b Sensor circuit 9 Capacitor m, M1, M2, M3 Two-phase motor with rotor position sensor Sa, Sb, Sc, Sd, S coil

Claims (3)

[Claims] 1. A stator having a plurality of salient poles radially arranged inward at an equal pitch angle, a winding wound around each of the salient poles, and an inner peripheral surface of the stator. And a plurality of permanent magnet rotor poles whose polarity is alternately repeated along the outer peripheral surface, and are disposed so as to face the salient poles via a gap, and are rotatably supported. A multi-phase motor with a rotor position sensor, comprising a rotor and the stator salient poles comprising a torque pole for generating torque and a sensor pole for detecting the rotor position, wherein the number of the stator salient poles is Is, when a is an integer of 1 or more,
16a, of which the number of sensor poles is 8k, where k is an integer of 1 or more and k ≦ a, and the rotor poles have 18a rotors with a rotor position sensor. Polyphase motor. 2. The sensor windings wound around the sensor poles are divided into four sensor groups, so that a detection output signal in each group is maximized and an induced voltage in each group is minimized. Connected, the torque winding wound around the torque pole is divided into the same number of torque groups as the number of phases, the maximum induced voltage in each group, and the phase difference of the induced voltage between each group, 1 / number of phases (2 or 4)
2. The multi-phase motor with a rotor position sensor according to claim 1, wherein the multi-phase motor is connected at 80 [deg.]. 3. A stator having a plurality of salient poles radially inwardly arranged at an equal pitch angle, a winding wound around each of the salient poles, and an inner peripheral surface of the stator. And a plurality of permanent magnet rotor poles whose polarity is alternately repeated along the outer peripheral surface, and are disposed so as to face the salient poles via a gap, and are rotatably supported. A multi-phase motor with a rotor position sensor, comprising a rotor and the stator salient poles comprising a torque pole for generating torque and a sensor pole for detecting the rotor position, wherein the number of the stator salient poles is Are 16 of which the number of sensor poles is 8, and the number of the rotor poles is 18. The sensor poles are of the same shape provided at an equal pitch angle of 45 ° mechanical angle, and the remaining 8 Torque poles are respectively disposed at central positions between the respective sensor poles. The shape of the torque pole and the shape of the sensor pole are not necessarily the same, and the eight sensor windings wound around each sensor pole are divided into four sensor groups. The two sensor windings of each group are arranged at a mechanical angle of 180 ° from each other, are connected so that the induced voltage in each group is minimized, and are wound around the torque pole. Torque winding is 2
Torque groups, the induced voltage in each group is maximized, and the phase difference of the induced voltage between each group is 9
A two-phase motor with a rotor position sensor, which is connected so as to be 0 °.