JP2006238556A - Synchronous motor and n-phase synchronous motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synchronous motor and an N-phase synchronous motor wherein reduction in the resistance R of winding can be prevented to enhance rotational speed without reducing the wire diameter D of the winding. <P>SOLUTION: Wiring conductors 23, 25, 27 equivalent to one phase are respectively constructed of first to third unit winding conductors 29, 31, and 33 arranged in the radial direction. The first to third unit wiring conductors 29, 31, and 33 are electrically connected in series. At the same time, they are so disposed that a current is passed through one unit wiring conductor 31 of the three unit wiring conductors 29, 31, and 33 in the opposite direction to the direction of the passage of current in the remaining two unit wiring conductors 29 and 33. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synchronous motor and an N-phase synchronous motor.

Japanese Patent Laid-Open No. 5-300710 (Patent Document 1) and the like show a star-connected three-phase motor. This type of motor has a stator core having 3 × M (N-phase × M) (where M is an integer of 1 or more) salient pole portions, and three sets selected from 3 × M salient pole portions. A stator is provided with three sets of M winding portions formed by winding winding conductors for one phase on M salient pole portions respectively.
Japanese Patent Laid-Open No. 5-300710

In this type of synchronous motor, the rotational speed is increased by increasing the frequency (f) of the AC power supply by an inverter or the like. However, if the frequency (f) exceeds a certain number, the inductive reactance (ωL = 2πfL) increases, so that the current flowing through the motor decreases and the motor does not rotate. Therefore, it has been considered to reduce the inductance L of the inductive reactance ωL by reducing the number of windings. However, if the number of turns of the winding is reduced, the winding length is shortened and the resistance R of the winding is also reduced, so the impedance Z is also reduced. Therefore, the motor input (P = E ² / Z) increases and the heat generation amount of the motor increases. Therefore, in order to increase the resistance R = CW / D ² [C: proportional constant, W: number of turns (winding length), D: wire diameter of winding)], it is considered to reduce the wire diameter D of the winding. It was. Note that the method of increasing the resistance R by increasing the number of turns (winding length) W cannot be adopted because the inductance L increases as described above.

  However, when the wire diameter D of the winding becomes small, the winding is easily cut. Therefore, there is a limit in reducing the wire diameter D of the winding.

  An object of the present invention is to provide a synchronous motor and an N-phase synchronous motor that can increase the rotation speed by preventing a decrease in the resistance R of the winding without reducing the wire diameter D of the winding. .

  A synchronous motor to be improved by the present invention includes a stator core having a plurality of salient pole portions and a plurality of winding portions formed by winding a winding conductor around each of the plurality of salient pole portions. It has a stator. In the present invention, the winding portion is formed by concentrating three unit winding conductors around the salient pole portion. The three unit winding conductors are electrically connected in series, and one unit winding conductor of the three unit winding conductors is in the opposite direction to the remaining two unit winding conductors. It is arranged so that the current flows.

  According to the present invention, the winding portion, which has been concentrated by one conventional winding, is concentratedly wound around the salient pole portion by three unit winding conductors connected in series. Double. In addition, since a current in the direction opposite to the remaining two unit winding conductors flows through one unit winding conductor among the three unit winding conductors, the magnetic field generated from the two unit winding conductors is , Cancel each other. Therefore, the inductance L is the inductance for one line as before. Therefore, the resistance R of the winding can be increased without increasing the inductance L. As a result, a synchronous motor capable of increasing the rotation speed without reducing the wire diameter D of the winding can be obtained. The present invention can be applied to both a star connection and a delta connection synchronous motor.

  An N-phase synchronous motor to which the present invention is applied includes a stator core having N × M (N is an integer of 2 or more, M is an integer of 1 or more) salient pole portions, and N × M salient pole portions. And N sets of M winding portions formed by sequentially winding winding conductors for one phase on N sets of M projections selected from the above. The winding conductor for one phase is composed of first to third unit winding conductors, and the first to third unit winding conductors are concentratedly wound around M salient pole portions, respectively. A winding portion is formed. The first to third unit winding conductors are electrically connected in series, and the first and third units of the first to third unit winding conductors are connected to the second unit winding conductor. It arrange | positions so that the electric current of a reverse direction may flow with a winding conductor. In this way, the resistance R of the winding for one phase in the N phase is three times that of the conventional one. In addition, the inductance L for one phase in the N phase is the inductance for one line as before. Therefore, it is possible to obtain an N-phase synchronous motor having two or more phases that can increase the rotation speed without reducing the wire diameter D of the winding.

  In this case, each of the first to third unit winding conductors has a pair of lead portions, and one lead portion of the pair of lead portions of the second unit winding conductor and the third unit winding conductor. Can be electrically connected, and the other lead portion of the pair of lead portions of the first unit winding conductor and the second unit winding conductor can be electrically connected. Then, the first input portion of the one-phase winding conductor is constituted by one lead portion of the pair of lead portions of the first unit winding conductor, and the pair of lead portions of the third unit winding conductor A second input part of the winding conductor for the phase can be constituted by the other lead part. In this way, three unit winding conductor materials are wound around a predetermined salient pole portion, and after winding, the end of each unit winding conductor material is cut to form a lead portion, and the predetermined lead portion It is possible to easily form three unit winding conductors connected in series simply by connecting.

  A more specific N-phase synchronous motor of the present invention includes N × M pieces of an annular yoke portion and a yoke portion that are arranged at a certain interval in the circumferential direction and configured integrally with the yoke portion. However, N is an integer greater than or equal to 2, and M is an integer greater than or equal to 1) and N × M salient poles so that N−1 salient pole parts are positioned in the circumferential direction. A stator including N sets of M winding portions formed by sequentially winding a winding conductor for one phase on each of N sets of M salient pole portions selected from the pole portions; And a rotor disposed inside the stator. The winding conductors for one phase are composed of first to third unit winding conductors each having a pair of lead portions, and the first to third unit winding conductors are respectively provided on M salient pole portions. Concentrated winding forms M winding portions. In addition, one lead portion of the pair of lead portions of the second unit winding conductor and the third unit winding conductor is electrically connected, and the first unit winding conductor and the second unit winding conductor are connected. The other drawer part of the pair of drawer parts is electrically connected. And one lead part of a pair of lead part of the 1st unit winding conductor constitutes the 1st input part of the winding conductor for one phase, and a pair of lead part of the 3rd unit winding conductor The other lead-out portion constitutes a second input portion of the winding conductor for one phase, and the second input portions of the winding conductors for N phase are respectively connected in common. In this way, it is possible to form a star connection motor in which the current flowing through the winding portions formed in the salient pole portions aligned in the circumferential direction is shifted in electrical order.

  The present invention can be applied to various motors such as a rotary motor, a linear motor, and a split motor. When applied to a hybrid type stepping motor, a plurality of stator small teeth arranged at predetermined intervals in the circumferential direction are provided on the magnetic pole surfaces of the plurality of salient pole portions of the stator core, and the permanent magnet What is necessary is just to provide the magnetic rotation body which equips the outer peripheral part with several rotor small teeth which show predetermined polarity with a permanent magnet.

  According to the present invention, the winding portion, which has been concentrated by one conventional winding, is concentratedly wound around the salient pole portion by three unit winding conductors connected in series. Double. In addition, since a current in the direction opposite to the remaining two unit winding conductors flows through one unit winding conductor among the three unit winding conductors, the magnetic field generated from the two unit winding conductors is , Cancel each other. Therefore, the inductance L is the inductance for one line as before. Therefore, the resistance R of the winding can be increased without increasing the inductance L. As a result, a synchronous motor capable of increasing the rotation speed without reducing the wire diameter D of the winding can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a synchronous motor according to an embodiment of the present invention applied to a hybrid stepping motor. As shown in FIG. 1, the synchronous motor of this example includes a stator 1 and a rotor 3. The rotor 3 includes a permanent magnet 5 and a magnetic rotating body 7 provided with a plurality of rotor small teeth 7 a having a predetermined polarity by the permanent magnet 5 on the outer peripheral portion. The stator 1 includes a stator core 9 and twelve winding portions 11A to 11L. The stator core 9 has an annular yoke portion 13 and twelve salient pole portions 15 </ b> A to 15 </ b> L that are arranged at a certain interval in the circumferential direction of the yoke portion 13 and are configured integrally with the yoke portion 13. is doing. 2, the salient pole parts 15A to 15L are provided at the winding winding part 17 connected to the yoke part 13 and at the tip of the winding winding part 17. And a magnetic pole forming portion 19 arranged. The winding portions 17 of the salient pole portions 15A to 15L are wound with a copper winding conductor 21 to be described later to form winding portions 11A to 11L. The magnetic pole forming portion 19 has a base portion 19 a connected to the winding winding portion 17 and four stator small teeth 19 b protruding from the base portion 19 a toward the rotor 3. The tips of the stator small teeth 19b are opposed to the rotor small teeth 7a of the rotor 3 with a gap.

  As shown in the schematic diagram of FIG. 3, the winding conductors 21 forming the winding portions 11 </ b> A to 11 </ b> L are conductor portions 23 through which currents of three phases, the U phase, the V phase, and the W phase, are shifted by 120 °. , 25 and 27 are star-connected. In FIG. 3, the salient pole portions 15A to 15L and the winding portions 11A to 11L wound around the salient pole portions 15A to 15L are depicted in an adjacent positional relationship. The winding portions 11A to 11L are selected from N × M (3 × 4 = 12) salient pole portions 15A to 15L such that N−1 (2) salient pole portions are positioned therebetween. Winding conductors (conductor portions 23, 25, 27) for one phase on the salient pole portions (15A, 15D, 15G, 15J), (15B, 15E, 15H, 15K), (15C, 15F, 15I, 15L), respectively. ) Is formed of M (4) winding portions of N sets (3 sets) wound sequentially. Specifically, a conductor portion 23 through which a U-phase current flows is sequentially wound around a first set of four salient pole portions 15A, 15D, 15G, and 15J, and four winding portions 11A, 11D, 11G, 11J is formed, and a conductor portion 25 through which a V-phase current flows is sequentially wound around the second set of four salient pole portions 15B, 15E, 15H, and 15K, so that four winding portions 11B, 11E, 11H, 11K is formed, and a conductor portion 27 through which a W-phase current flows is wound around the third set of four salient pole portions 15C, 15F, 15I, and 15L, and the four winding portions 11C, 11F, 11I, 11L is formed. As a result, the currents flowing through the winding portions 11A to 11L are arranged in the circumferential direction in the order of U phase, V phase, W phase, U phase, V phase, W phase,.

  The conductor portions (winding conductors for one phase) 23, 25, and 27 are configured by first to third unit winding conductors 29, 31, and 33 arranged in the radial direction, respectively. Each of the first to third unit winding conductors 29, 31, and 33 has a pair of lead portions (29a, 29b) (31a, 31b) (33a, 33b) at both ends. And one lead part 31a, 33a of a pair of lead part (31a, 31b) (33a, 33b) of the 2nd unit winding conductor 31 and the 3rd unit winding conductor 33 is electrically connected, and the 1st The other lead portions 29b, 31b of the pair of lead portions (29a, 29b) (31a, 31b) of the one unit winding conductor 29 and the second unit winding conductor 31 are electrically connected. Further, one lead portion 29a of the pair of lead portions 29a and 29b of the first unit winding conductor 29 constitutes a first input portion of the winding conductor (23, 25, 27) for one phase, The other lead portion 33b of the pair of lead portions 33a and 33b of the third unit winding conductor 33 constitutes a second input portion of the winding conductors (23, 25, 27) for one phase. The second input portions 33 b of the three-phase winding conductors 23, 25, and 27 are connected in common at the neutral point 35. With such a configuration, the first to third unit winding conductors 29, 31, and 33 are electrically connected in series, and the first to third unit winding conductors are indicated by arrows in FIG. The current in the direction opposite to that of the first and third unit winding conductors 29 and 33 flows through the second unit winding conductor 31 among 29, 31 and 33.

  In this example, three unit winding conductor materials are wound around a predetermined salient pole part, and after winding, the end of each unit winding conductor material is cut, and each predetermined end part is welded with solder. First to third unit winding conductors 29, 31, and 33 were formed.

  According to the synchronous motor of this example, concentrated winding is performed around the salient pole portions 15A to 15L by the three unit winding conductors 29, 31, and 33 connected in series to the winding portion that has been concentrated by one conventional winding. Therefore, the resistance R of the windings 11A to 11L is three times that of the conventional one. In addition, since the current in the direction opposite to the remaining two unit winding conductors 29 and 31 flows through one unit winding conductor 31 among the three unit winding conductors 29, 31 and 33, The magnetic fields generated from the unit winding conductors 29 and 31 cancel each other. Therefore, the inductance L is the inductance for one line as before. Therefore, the resistance R of the winding can be increased without increasing the inductance L. As a result, the rotational speed of the synchronous motor can be increased without reducing the wire diameter D of the windings 11A to 11L.

  In the above example, the example in which the synchronous motor of the present invention is applied to the hybrid stepping motor has been shown. However, the present invention can of course be applied to other rotary motors, linear motors, and split motors. .

  In the above example, the star connection synchronous motor is applied. However, the present invention can be applied to a delta connection synchronous motor.

It is a top view of the synchronous motor of one embodiment of the present invention applied to a hybrid type stepping motor. It is the elements on larger scale of FIG. It is the schematic which shows the wiring of the winding conductor used for the synchronous motor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 3 Rotor 5 Permanent magnet 7 Magnetic rotating body 11A-11L Winding part 13 Relay part 15A-15L Salient pole part 21 Winding conductors 23, 25, 27 Conductor part (winding conductor for 1 phase)
29a, 29b, 31a, 31b, 33a, 33b

Claims (5)

A stator core having a plurality of salient pole portions;
A synchronous motor having a stator having a plurality of winding portions formed by winding a winding conductor around each of the plurality of salient pole portions,
The winding part is formed by concentrating three unit winding conductors around the salient pole part,
The three unit winding conductors are electrically connected in series, and among the three unit winding conductors, one unit winding conductor is the remaining two unit winding conductors. A synchronous motor characterized by being arranged so that a current in a reverse direction flows. A stator core having N × M pieces (where N is an integer of 2 or more and M is an integer of 1 or more),
N sets of M winding portions formed by sequentially winding a winding conductor for one phase around the N sets of M salient pole portions selected from the N × M salient pole portions. An N-phase synchronous motor having a stator with
The winding conductor for one phase is composed of first to third unit winding conductors,
The first to third unit winding conductors are concentratedly wound around the M salient pole portions to form the M winding portions,
The first to third unit winding conductors are electrically connected in series, and among the first to third unit winding conductors, the first and third unit winding conductors are connected to the second unit winding conductor. An N-phase synchronous motor is arranged so that a current in a direction opposite to that of the unit winding conductor flows. Each of the first to third unit winding conductors has a pair of lead portions,
One lead portion of the pair of lead portions of the second unit winding conductor and the third unit winding conductor is electrically connected, and the first unit winding conductor and the second unit are electrically connected. The other lead portion of the pair of lead portions of the winding conductor is electrically connected,
The one lead portion of the pair of lead portions of the first unit winding conductor constitutes a first input portion of the one-phase winding conductor, and the third unit winding conductor 3. The N-phase synchronous motor according to claim 2, wherein the other lead portion of the pair of lead portions constitutes a second input portion of the winding conductor for one phase. N × M pieces (where N is an integer greater than or equal to 2 and M is greater than or equal to 1) that is arranged with a certain interval in the circumferential direction of the annular yoke portion and the yoke portion and is configured integrally with the yoke portion N sets of N selected from the N × M salient pole portions so that N−1 salient pole portions are positioned in the circumferential direction. A stator including M sets of M winding portions formed by sequentially winding a winding conductor for one phase on each of the M salient pole portions;
An N-phase synchronous motor having a rotor disposed inside the stator,
Each of the winding conductors for one phase includes first to third unit winding conductors each having a pair of lead portions,
The first to third unit winding conductors are concentratedly wound around the M salient pole portions to form the M winding portions,
One lead portion of the pair of lead portions of the second unit winding conductor and the third unit winding conductor is electrically connected, and the first unit winding conductor and the second unit are electrically connected. The other lead portion of the pair of lead portions of the winding conductor is electrically connected,
The one lead portion of the pair of lead portions of the first unit winding conductor constitutes a first input portion of the one-phase winding conductor, and the third unit winding conductor of the third unit winding conductor The other lead part of the pair of lead parts constitutes a second input part of the one-phase winding conductor,
An N-phase synchronous motor, wherein the second input portions of the winding conductors for N phases are connected in common. A plurality of stator small teeth arranged at predetermined intervals in the circumferential direction are provided on the magnetic pole surfaces of the plurality of salient pole portions of the stator core,
5. The N-phase synchronous according to claim 4, wherein the rotor includes a permanent magnet and a magnetic rotating body having a plurality of rotor teeth having a predetermined polarity by the permanent magnet and having an outer peripheral portion. motor.

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