JPS6026550Y2 - Stator of brushless motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator of a brushless motor whose energization is controlled by a semiconductor element.

Conventional devices of this type include those shown in FIGS. 1 and 2.

The one shown in Fig. 1 has 24 slots S in the radial direction on the outer periphery of the stator core I for the outer magnet rotor, so that three adjacent salient poles T constitute one excitation pole. Each phase stator winding A, B, and C is wound around eight poles.

In this case, the A-phase is first wound on the innermost stage of the slot so as to form three concentric stages, the B-phase is wound on the outer periphery of the inner stage, and the C-phase is then wound on the outer periphery intermittently. .

Further, the winding is performed such that the excitation poles of each phase are shifted in the circumferential direction by the excitation pole pitch/number of phases.

In this winding method, each stator winding is wound only on one side stage, so the amount of copper in the stator winding increases toward the outer stage, and the impedance increases.

Therefore, the excitation currents of the stator windings of each phase are different, causing tricripple and deterioration of wah performance.

In addition, in order to detect the rotational speed voltage, a generator winding is provided that is magnetically coupled to each phase stator winding, or the reverse induced voltage is taken out from each phase stator winding via a diode. Since the amount of copper in each phase stator winding is different, the speed voltage generated from each phase is different, resulting in uneven servo application and deterioration of wah performance.

Next, FIG. 2 shows a different conventional stator wound with three-phase eight-pole stator windings A, B, and C.

This is done by forming 8 excitation bone coils for each phase in advance, and manually winding each excitation pole coil 1 at a 3-slot pitch so that 8 coils for each phase are connected in series. Each excitation pole coil is soldered.

According to this winding method, the excitation pole coil 1 of each phase is bridged between the deep side of one slot S and the opening side of the other slot S, so that the copper content and impedance of each phase are uniform. Although it is an ideal form in terms of impedance, it has the disadvantage that mechanical winding is completely impossible, and that the connecting wire 1' between adjacent excitation pole coils 1, 2 becomes long and requires a large amount of copper.

The present invention has been devised in view of these points, and is intended to keep the impedance difference between the stator windings of each phase within a permissible range and to facilitate mechanical winding of the stator windings.

An embodiment of the present invention will be described below with reference to FIG.

24 slots S and salient poles T are formed in the radial direction on the outer periphery of the laminated stator core (■) for the outer magnet rotor.
Phase fixed phase element windings A, B, and C are wound.

Each stator winding has two coil groups A1 and A2,
The coil group is divided into B1 and B2, C1 and C2, and each coil group is wound in a 3-slot pitch full-pitch winding so as to form eight poles.

To explain in more detail, when winding the coil group A1, the winding machine 2 equipped with the rotary arm 1 is positioned as shown, and the coil wire drawn out from the tip of the rotary arm 1 is rotated by the rotation of the rotary arm 1. The first excitation pole coil a1 is formed by winding a predetermined number of turns across the salient poles 11 11 1.

After that, the stator core I is rotated in the electrical angle π arrow direction P,
Similarly, the second excitation pole coil a2 is formed by the reverse rotation of the rotation arm I.

Thereafter, the third to eighth excitation pole coils a3 to a8 are wound in the same manner, and the winding of the coil group A□ is completed.

Next, when winding coil group B, stator core ■
is rotated by an electrical angle π in the direction of the arrow P, and the winding machine 2 is rotated with an electrical angle of π in the direction of the arrow Q. r73 rotations, and coil group B is wound in the same manner as the above-described winding of coil group A1.

Furthermore, the coil group C1 is wound thereafter.

Thus, the first coil group A1 . of each stator winding. B
1. C1 is concentrically wound in order from phase A to phase C, and then a second coil group A2. B2. Similarly, C2 is wound concentrically in the order of A phase to C phase.

In the above embodiment, each of the three-phase stator windings is divided into two coil groups, and each coil group of each stator winding is wound concentrically twice in the order of A phase to C phase. However, in general, the N-phase stator winding is divided into individual coil groups, and each coil group of each stator winding is arranged concentrically in the order from the first sum to the Nth sum. It should be wrapped in.

In order to equalize the impedance value of each stator winding, each stator winding is divided into, for example, two groups, and each group of stator windings is wound concentrically around the stator core. When installing, it is desirable to wind one of the divided groups on the back side of the slot and the other on the opening side of the slot symmetrically with respect to the slot center position, but in this case, one of the divided groups The group must be wound in the order from the 1st phase to the Nth phase, and the other group must be wound in the reverse order from the Nth to the 1st phase, which complicates the driving of the winding device and increases the winding time. , the cost required for wrapping increases.

As described above, according to the present invention, the N-phase stator windings are divided into groups, and each group of stator windings is wound concentrically from the 1st phase to the Nth phase. , compared to the conventional method in which each stator winding is wound without dividing, the number of turns of each excitation pole coil is l/k, so the winding width of each excitation pole coil is smaller, and each fixed The difference in impedance values between child windings becomes smaller.

In addition, if each group of stator windings is wound repeatedly in the order from the first phase to the Nth phase, the winding device can be driven easily and the winding cost can be reduced. This has great practical effects.

[Brief explanation of the drawing]

1 and 2 are plan views of a stator core showing different conventional stator winding systems, and FIG. 3 is a plan view of a stator core wrapped with stator windings according to the present invention. A, B, C... Stator winding, ■... Stator core, A
□, A2, B1. B2, C work, C2...divided coil group.

Claims (1)

[Scope of utility model registration request] Each of the N-phase stator windings is divided into a plurality of excitation pole coils, and the plurality of excitation pole coils of the same phase are inserted into radial slots formed in an annular shape on the stator core at a desired slot pitch. In a device in which the stator windings of different phases are wound concentrically with electrical angles of π/N, the stator windings of each phase each connect the plurality of excitation pole coils with each other. 1. A stator for a brushless motor, characterized in that the stator is divided into groups, and the stator windings of each phase of the same numbered group are arranged adjacent to each other in the radial direction of a stator core.