JPH09322455A - Permanent magnet type electric rotating machine having concentrated winding stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase torque and output by winding an additional stator winding to each stator magnetic pole in such a manner that the winding enters an opening groove between the magnetic poles of the stator, and by connecting this additional stator winding to stator winding in series for each phase. SOLUTION: An electric motor 50 comprises a stator 30 and a rotor 40, and the stator 30 comprises a stator core 20, stator winding 21, and an additional stator winding 22 arranged inside an opening groove 25 formed between stator magnetic poles. For example, a magnetic flux passes an air gap from a magnetic pole 3 and passing through a permanent magnetic rotor 16 and a stator yoke 17 respectively passes through the permanent magnet rotor 16 of unlike poles and air gap, is divided into magnetic poles 2 and 4 and returns to the magnetic pole 3. Because of this, the magnetic flux is interlinkaged with the stator winding 21 and additional stator winding 22 connected in series and a high induced voltage can be obtained. By doing this, a permanent magnet rotating machine having a large torque and a high output can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet rotating electric machine, and more particularly to a permanent magnet rotating electric machine having a concentrated winding stator capable of obtaining a large torque and a high output.

[0002]

2. Description of the Related Art Permanent magnet rotating electric machines, such as servo motors, which are required to have high-speed response, generally have a stator magnetic pole
Concentrated winding is performed in which the stator windings are concentratedly wound around the magnetic poles, but it is desired that the magnetic poles are small, have a large torque, and have a small rotor inertia.

In order to reduce the rotor inertia,
The rotor has an inner rotor structure formed inside the stator magnetic poles, and the outer diameter of the rotor is extremely small. The stator winding is concentratedly wound around the stator magnetic pole using the nozzle of the winding machine through the opening groove formed between the stator magnetic poles. With the minimization of the
The cross-sectional area of the opening groove formed between the stator magnetic poles is almost equal to the cross-sectional area of the slot around which the stator winding is wound, limiting the total number of turns of the stator winding to the stator magnetic pole. Was there.

[0004]

As described above, according to the permanent magnet rotating electric machine having the conventional concentrated winding stator, the stator is fixed to the stator magnetic pole according to the size of the opening groove formed between the stator magnetic poles. Since the number of turns of the subsidiary winding is limited, the torque of the motor is reduced, which hinders high output. An object of the present invention is to provide a permanent magnet rotating electric machine that has a large torque and can obtain a high output by increasing the total number of turns of the stator windings wound around the stator magnetic poles, excluding the above drawbacks. To do.

[0005]

SUMMARY OF THE INVENTION A permanent magnet rotating electric machine having a concentrated winding stator according to the present invention comprises a multi-phase stator winding concentratedly wound on M stator magnetic poles, and the stator magnetic pole. A stator having an opening groove formed therebetween and a permanent magnet rotor having P permanent magnet magnetic poles are provided, and the permanent magnet pole number P and the stator magnetic pole number M are P: M = 6n. In a permanent magnet rotating electric machine of ± 2: 6n (where n is an integer of 2 or more), an additional stator winding is wound around each of the stator magnetic poles so that the stator magnetic poles fit in the opening grooves formed between the stator magnetic poles. The additional stator winding and the stator winding are connected in series for each phase.

In the permanent magnet rotating electric machine having the concentrated winding stator of the present invention, the number of the additional stator windings is half the number M of the stator magnetic poles.

[0007]

According to the permanent magnet rotating electric machine having the concentrated winding stator of the present invention, an additional stator winding provided in the opening groove formed between the stator winding and the stator magnetic pole is provided in each phase. By connecting in series, the number of turns of the stator winding of each phase can be increased, so a large torque can be obtained, and moreover,
A high output permanent magnet rotating electric machine can be obtained.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a permanent magnet rotating electric machine according to the present invention. The electric motor 50 shown in FIG.
0 and the rotor 40, the stator 30 is the stator core 2
0, the stator winding 21, and the additional stator winding 22 arranged in the opening groove 25 formed between the stator magnetic poles. Here, the stator core 20 includes, for example, an annular stator yoke 26 and twelve stator magnetic poles 27 composed of magnetic poles 1 to 12.

The rotor 40 comprises a permanent magnet rotor 16 having 14 magnetized N and S poles, a rotor yoke 17 made of an iron material, and a rotor shaft 18.

The stator windings 21 are U1 +, U1-, U2.
-, U2 + U phase and W1-, W1 +, W2 +, W2-
W phase and V1 +, V1-, V2-, V2 + V phases. The additional stator winding 22 is U1 wound around the magnetic pole 1 so as to be added in the opening groove 25 adjacent to the magnetic pole 1.
A +, the U-phase component of U2A- added to the magnetic pole 7 directly opposite, the W1A- added to the magnetic pole 3, the W-phase component of W2A + added to the magnetic pole 9 directly opposite, and the W-phase component added to the magnetic pole 5 It is composed of six winding elements for V phase of V1A + and V2A- added to the magnetic pole 11.

FIG. 2 shows each of the magnetic poles 1 to 1 of the stator magnetic pole 27.
2 is a connection diagram of the stator winding 21 wound in 2 and the additional stator winding 22 added after the winding of the stator winding 21. FIG.

U1A + of the U phase of the additional stator winding 22 is U
It is wound in the same direction as 1+, is connected in series between U1 + and U1-, and U2A- is wound in the same direction as U2-
It is connected in series between 2- and U2 +. Similarly, W of W phase
1A- is connected in series between W1- and W1 +, and W2A +
Is connected in series between W2 + and W2-, and V phase V1A +
Is connected in series between V1 + and V1-, V2A- is V2
It is connected in series between − and V2 +. Therefore, the total number of turns of the U-phase stator winding is [(U1 +) + (U1A
+) + (U1-) + (U2-) + (U2A-) + (U2
+)] And additional stator windings (U1A +) and (U2A +)
-) Increase by the number of turns. W phase is also (W1A-) and (W
In the 2A +) and V-phase, the number of turns increases by (V1A +) and (V2A-).

FIG. 3 is a magnetic flux distribution diagram of a quarter section of 12 magnetic poles 1 to 4 in the permanent magnet rotating electric machine having the concentrated winding stator of the present invention shown in FIG. For example, from the magnetic pole 3 through the air gap, the permanent magnet rotor 16 and the rotor yoke 1
The magnetic flux which has passed through 7 passes through the air gaps of the permanent magnet rotors having different polarities and is divided into magnetic poles 2 and 4 and returns to the magnetic pole 3. For this reason,
Stator winding 21 and additional stator winding 22 connected in series
A large induced voltage is obtained due to the magnetic flux interlinking with each other.

In the permanent magnet rotating electric machine to which the present invention is applied, the number P of permanent magnet poles and the number M of stator magnetic poles are set to P: M = 6.
n ± 2: 6n (where n is an integer of 2 or more). The permanent magnet rotor may be of an outer rotor type arranged outside the magnetic poles of the stator.

FIG. 4 shows another embodiment of the present invention. In this embodiment, in the U phase of the additional stator winding 22, U1A- which is wound around the magnetic pole 2 and the magnetic pole 8 which is directly opposite thereto are wound around. An additional coil U2A + is added, and W1A is added to the magnetic pole 4 in the W phase.
−, W2A− is added to the magnetic pole 10, V1A− is added to the magnetic pole 6 and V2A + is added to the magnetic pole 12 in the V phase.

The additional stator winding may be wound around all of the magnetic poles 1 to 12 of each stator magnetic pole 27.

The above embodiment shows an electric motor having three phases, in which the permanent magnet rotor 40 has 14 poles and 12 stator poles, but the present invention is also applicable to a generator. Of course you can. Further, the present invention can be applied to a motor and a generator in which the number of poles of the permanent magnet rotor 40 and the number of poles of the stator are 12, which have the same stator winding connection diagram.

[0019]

Since the permanent magnet rotating electric machine having the concentrated winding stator of the present invention has the above-mentioned structure, the total number of turns of the stator winding can be increased, and thus a large induced voltage can be obtained. Therefore, there is a great advantage that a permanent magnet rotating electric machine having a large torque and a high output can be obtained.

[Brief description of drawings]

FIG. 1 shows a vertical sectional view of a permanent magnet rotating electric machine of the present invention.

FIG. 2 is a connection diagram of a stator winding and an additional stator winding in a permanent magnet rotating electric machine having a concentrated winding stator of the present invention.

FIG. 3 shows a magnetic flux distribution in a permanent magnet rotating electric machine having a concentrated winding stator of the present invention.

FIG. 4 is a connection diagram of a stator winding and an additional stator winding in another embodiment of the permanent magnet rotating electric machine having the concentrated winding stator of the present invention.

[Explanation of symbols]

 1 magnetic pole 2 magnetic pole 3 magnetic pole 4 magnetic pole 5 magnetic pole 6 magnetic pole 7 magnetic pole 8 magnetic pole 9 magnetic pole 10 magnetic pole 11 magnetic pole 12 magnetic pole 16 permanent magnet rotor 17 rotor yoke 18 rotor shaft 20 stator core 21 stator winding 22 additional stator Winding 25 Opening groove 26 Stator yoke 27 Stator magnetic pole 30 Stator 40 Rotor 50 Motor U1A + U-phase additional stator winding U1A-U-phase additional stator winding U2A + U-phase additional stator winding U2A -U-phase additional stator winding W1A- W-phase additional stator winding W1A + W-phase additional stator winding W2A + W-phase additional stator winding W2A- W-phase additional stator winding V1A + V-phase Additional stator windings V1A- V phase additional stator windings V2A- V phase additional stator windings V2A + V phase additional stator windings

Claims (2)

[Claims] 1. A stator having a multi-phase stator winding concentratedly wound on M stator magnetic poles, an opening groove formed between the stator magnetic poles, and P permanent magnets. A permanent magnet rotor having magnet magnetic poles, wherein the number of permanent magnet poles P and the number of stator magnetic poles M are P: M = 6n ± 2: 6n (where n is an integer of 2 or more) In an electric machine, an additional stator winding is wound around each of the stator magnetic poles so as to fit in an opening groove formed between the stator magnetic poles, and the additional stator winding and the stator winding are provided for each phase. A permanent magnet rotating electric machine having a concentrated winding stator characterized by being connected in series. 2. The permanent magnet rotating electric machine having a concentrated winding stator according to claim 1, wherein the number of the additional stator windings is half of the number of stator magnetic poles M.