JP3240006B2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and particularly to a motor having an iron core.

[0002]

2. Description of the Related Art Conventionally, a motor having an iron core is constituted by an iron core 4 provided on a stator side and a rotor magnet 3 connected to a rotating shaft 5, as shown in FIG. Each slot U1, U2, V1,
Windings 7 are wound around V2, W1, and W2, respectively.

[0003] This iron core 4 is a slot U forming a first phase.
1 and U2 and slots V1 and V2 forming the second phase.
And the slots W1 and W2 forming the third phase to form a three-phase, six-slot configuration, and further to an eight-pole rotor-side magnet 3.

Accordingly, the magnet 3 can be driven to rotate by applying a drive current in a predetermined order to the winding 7 wound around each of the first, second and third slots. .

[0005]

In the motor 1 of this type, as a method of reducing the rotational load at the time of starting the rotation called static cogging, the rotating shaft 5 is moved in a direction parallel to the rotating shaft 5 with an iron core. There is a method of skewing in a spiral around the center.

However, in a motor using an iron core having such a skew structure, it is difficult to mount a rotation detecting element such as a Hall element between slots of the iron core, and it is not sufficient for a thin motor. A skew angle cannot be obtained, and it is difficult to reduce static cogging to a practically sufficient range.

The present invention has been made in view of the above points, and has as its object to propose a motor that can reduce static cogging more effectively.

[0008]

In order to solve the above-mentioned problems, the present invention has an iron core 14 and a magnet 3 provided at positions facing each other, and has three phases, 4n poles,
In a 3n-slot (n = 2, 3,...) Motor 10, a plurality of identically-shaped winding portions U1,
The relative positions of U2, V1, V2, W1, W2 and a plurality of magnetic poles forming the magnet 3 are determined by a plurality of winding portions U1, U
2, a position changed by the following angle X degrees that is different for each of V1, V2, W1, and W2 is set. However, the in-phase slots U1, U2, V1, V2, W
1 and W2 are numbered 1 to n, and the numbers assigned to the slots U1, U2, V1, V2, W1, and W2 in the same phase are k (k = 1 to n).

[0009]

The relative positions of the slots U1, U2, V1, V2, W1, W2 of the iron core 14 and the magnets 3 provided at positions facing each other and the magnets 3 are determined by the respective slots U1, U.
2, V1, V2, W1, and W2 are shifted by different angles, so that each pole of the magnet 3 and each slot U are shifted.
1, U2, V1, V2, W1, and W2 can be prevented from having the same positional relationship, whereby static cogging caused by the magnetic field of the magnet 3 can be further reduced.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

In FIG. 1, in which parts corresponding to those in FIG. 4 are assigned the same reference numerals, a motor 10 is a three-phase, eight-pole, six-slot iron-core motor, and has three phases (U-phase, V-phase, W phase) respectively have two slots U1 and U2, V1 and V2,
It is formed by W1 and W2.

Each of the six slots U1, U2, V1, V
2, W1 and W2 are two slots U1 and U2, V1 and V2, W1 and W2 forming respective phases U, V and W from a position obtained by dividing 360 ° into six equal parts with respect to the rotation direction. Are shifted from each other by a predetermined angle.

That is, the angles of the slots U1 and U2 forming the first phase are formed so as to be shifted by the shift angle X from the case where the slots U1 and U2 are formed at equal intervals (FIG. 4). Further, the angles of the slots V1 and V2 forming the second phase are formed so as to be shifted by the shift angle X from the case where the slots V1 and V2 are formed at equal intervals (FIG. 4). Further, the angles of the slots W1 and W2 forming the third phase are formed so as to be shifted by the shift angle X from the case where the slots W1 and W2 are formed at equal intervals (FIG. 4).

The shift angle X [°] is three phases, four n poles, three phases,
In the motor having n slots (n = 2, 3,...), slots 1 to n are appropriately numbered to slots in the same phase, and the number assigned to each slot is k, and

(Equation 1) Is required by

In this embodiment, the motor 10 has three phases, eight
With a pole, 6 slot configuration, n = 2,
Further, by assigning numbers Uk, Vk and Wk as shown in FIG. 2A to each slot, the position of each slot becomes as shown in FIG. 2A based on the equation (1).

That is, in this case, the slots U1, V1, W1 with k = 1 are shifted by + 3.75 °, and the slots U2, V2, W2 with k = 2 are shifted by -3.75 ° (FIG. 2 ( In (A), "+" is a counterclockwise direction and "-" is a clockwise direction).

In the above configuration, the motor 10 is
As shown in (A) to (F), each slot U1, U2, V
The positional relationship among the poles of 1, V2, W1, W2 and the magnet 3 is different at a fixed angle for each slot.

Therefore, the slots U1, U2, V1, V2,
Since there is no slot having the same positional relationship among the positional relationships of W1, W2 and the magnet 3, static cogging generated according to the magnetic field of the magnet 3 and the positional relationship of the slots can be reduced.

Further, by using the skew of the magnetized pattern together, it is possible to sufficiently reduce the static cogging by slightly skewing the iron core 14, thereby effectively reducing the static cogging even in a thin motor. obtain.

According to the above configuration, the positional relationship between each slot and the magnet is shifted by a different angle for each slot, so that static cogging can be more effectively reduced.

By displacing the slot angle, it is possible to secure a place for mounting a sensor such as a rotation detecting element between the slots having a wide interval.

In the above-described embodiment, the method of allocating the number k to the slots Uk, Vk, and Wk has been described with reference to FIG. 2A. However, the present invention is not limited to this. 2 (B). In this case, each slot may be shifted in a predetermined direction by a shift angle X (according to equation (1)) in accordance with the number k.

In the above embodiment, three phases, eight
The case where the present invention is applied to the motor 10 having six poles and six slots has been described.
It can be widely applied to motors satisfying poles and 3n slots (n = 2, 3,...).

[0024]

As described above, according to the present invention, the positional relationship between a plurality of windings having the same shape and the magnetic poles of the magnet forming the iron core is shifted by a different angle for each winding. With this, while securing the mounting location of the sensor such as the rotation detection element between the windings with a wider interval,
A motor which can reduce static cogging more effectively can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a motor according to the present invention.

FIG. 2 is a schematic diagram illustrating a slot formation state according to the present invention.

FIG. 3 is a schematic diagram illustrating a positional relationship between a magnet and a slot.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

1,10 ... motor, 3 ... magnet, 4,14 ...
Iron core, 5 ... rotating shaft, 7 ... winding, U1, U2, V1,
V2, W1, W2 ... Slot.

Claims (1)

(57) [Claims] [Claim 1] have a iron core and Magunetsuto provided so as to be opposite to each other, and three-phase, 4n poles, 3n slots
(N = 2, 3,...), The relative positions of the plurality of identically shaped winding portions forming the iron core and the plurality of magnetic poles forming the magnet are determined for each of the plurality of winding portions. It changes by the following angle X degrees which are different from each other
A motor characterized in that it is set at a position where the motor is formed. However, the slots of the same phase are numbered from 1 to n,
The number assigned to each slot in the same phase is k (k = 1 to
n).