JPH078130B2 - Pulse motor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a four-phase hybrid type pulse motor having a small dimension in one direction perpendicular to a rotation axis.

[Conventional technology]

4 (a) and 4 (b) are a longitudinal sectional view and an AA line sectional view showing an example of a conventional four-phase hybrid type pulse motor. In these figures, the pulse motor is the rotor 5,
The rotor 5 has a stator 10, and the rotor 5 has a rotating shaft 4, rotor cores 2-1 and 2-2, and a permanent magnet 1. Each of the rotor cores 2-1 and 2-2 has teeth 3, and these rotor cores 2
-1,2-2 are arranged and fixed in the longitudinal direction of the rotary shaft 4 via the permanent magnet 1.

In the stator 10, a stator iron core 6 has a plurality of magnetic poles 7, and each of these magnetic poles 7 has teeth 8 having a pitch (which will be described later) slightly different from the teeth 3 of the rotor iron cores 2-1 and 2-2. Further, the coil 9 is wound.

Further, 11 is a bearing and 12 is a housing.

This operation is well known and will be briefly described below.

FIG. 5 is a developed model diagram for explaining the operation of FIG. 4, and mainly shows the S pole side of the permanent magnet 1. Roman numerals I, II, III and IV indicate phase numbers. The pitch of the teeth 8 of the magnetic pole 7 is sequentially shifted by 1/4 with respect to the pitch of the teeth 3.

The coils 9 are not shown in the magnetic poles 7 corresponding to the phase numbers II and IV in order to simplify the description.

Now, in the state shown in FIG. 5, when a current flows through the coil 9 of the magnetic pole 7 having the phase number I and the phase number III in the direction shown, the teeth 8 are magnetized to have the polarities shown in the figure. Therefore, the teeth 3 of the rotor core 2-2
The magnetic flux from the permanent magnet 1 shown by the solid line and the magnetic flux from the coil 9 shown by the dotted line flow between the stator 8 and the tooth 8 of the stator 10. As a result, an attractive force is generated at the portion of the tooth 8 of phase number I where the magnetic flux increases, and the rotor 5 moves to the right by 1/4 pitch. Then, the tooth 8 having the coil 9 of the phase number II, to which no current has flowed, has the same positional relationship with the tooth 3 of the rotor 5 as the tooth 8 of the phase number I before operating, and the same operation as the previous time is performed. It can be carried out. If you repeat this, it will always be 1
A suction force acts between the tooth 8 of one phase number and the tooth 3 of the rotor 5, so that the rotor 5 can continue to rotate in one direction.

[Problems to be solved by the invention]

In the structure described above, it is necessary to reduce the diameter of the rotor 5 in order to reduce the diameter of the pulse motor, and as a result, the torque is reduced, which makes it difficult to reduce the diameter. Further, it is relatively easy to reduce the size of the main body in the axial direction of the rotating shaft 4, so-called thinning, and the reduction in torque is commensurate with the reduction in size. ing. However, this type requires a certain length because the rotating shaft 4 is attached with gears, so the conventional pulse motor in which the length of the rotating shaft 4 is the same as the thickness direction of the main body is expected to be much smaller. There was a problem that it could not be done.

An object of the present invention is to provide a pulse motor having a form and size which have never been achieved by reducing the size in one direction perpendicular to the rotation axis, and to contribute to downsizing and thinning of various devices.

[Means for Solving Problems] A pulse motor according to the present invention includes a rotor 5 and a stator.
The rotor 5 has a rotary shaft 4 and four rotor cores 2-1, 2-2, 2- sequentially arranged in the longitudinal direction of the rotary shaft 4.
3, 2-4 and permanent magnet 1, and these rotor iron cores 2-
1,2-2,2-3,2-4 each have teeth 3, and two inner rotor cores 2-2,2-3 are coupled via a permanent magnet 1, and the stator 10 is a stator. The iron cores 6A and 6B are wound around the coil 9 and arranged symmetrically with respect to the rotation axis 4 of the rotor 5, and the stator iron cores 6A and 6B have magnetic poles 7-1A and
7-2A; 7-3A, 7-4A; 7-1B, 7-2B; 7-3B, 7-4B, and the rotor 5 and the stator 10 are rotor cores 2-1, 2-2, 2 -3,2-
4 teeth 3 and magnetic poles of stator 10 7-1A, 7-2A; 7-3A, 7-4A; 7-1B,
7-2B; teeth 8 of 7-3B, 7-4B are formed at the same pitch, and teeth 3 of rotor cores 2-1, 2-2, 2-3, 2-4 and magnetic poles 7-1A, 7 -2A; 7-3
The facing relationship between the teeth A, 7-4A; 7-1B, 7-2B; 7-3B, 7-4B and the tooth 8 is relatively sequentially shifted by 1/4 pitch.

[Action]

In the present invention, the rotor cores 2-1, 2-2, 2-3, 2-4, which are sequentially provided in the longitudinal direction of the rotating shaft 4 of the rotor 5, have the magnetic poles 7-1A, 7-2A; 7-3A, 7-4A; 7-1B, 7-2
B; 7-3B, 7-4B is sucked, and continuous rotation is obtained as a whole.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are a schematic plan view and a side sectional view thereof. The same reference numerals as those in FIG. 4 indicate the same parts.

In these figures, the pulse motor comprises a rotor 5 and a stator 10, and the rotor 5 includes a rotary shaft 4 and four rotor cores 2-1, 2 sequentially arranged in the longitudinal direction of the rotary shaft 4.
2,2-3,2-4 and a permanent magnet 1, these rotor cores 2-1, 2-2, 2-3, 2-4 have teeth 3 respectively, and Two rotor cores 2-2 and 2-3 are sequentially arranged and connected via a permanent magnet 1.

The stator 10 has a pair of stator cores 6A and 6B arranged on the left side A and the right side B of the rotor 5. The stator cores 6A and 6B are respectively wound with coils 9, are arranged symmetrically with respect to the rotation axis 4 of the rotor 5, and have magnetic poles 7-1A and 7A having teeth 8.
-2A; 7-3A, 7-4A; 7-1B, 7-2B; 7-3B, 7-4B are provided.

The rotor 5 and the stator 10 are the rotor cores 2-1, 2-2,
Teeth 3 of 2-3,2-4 and magnetic poles 7-1A, 7-2A; 7-3A, 7-4A; 7-1B, 7-2B; 7
The facing relationship between the teeth 3B and 7-4B and the tooth 8 is relatively sequentially shifted by 1/4 pitch.

The housing is omitted in FIGS. 1 and 2.

Next, this operation will be described with reference to FIG.

FIG. 3 is a development model diagram for explaining the operation of the pulse motor shown in the embodiment of FIGS. 1 and 2.

In FIG. 3, regarding the rotor cores 2-1, 2-2, 2-3, 2-4, only two teeth 3 are shown, respectively, and only two teeth 8 facing them are shown. And each rotor iron core 2-1,2-2,2-3,2-
4 are sequentially arranged in the longitudinal direction of the rotary shaft 4 as shown in FIG. 1, or are shown on the same plane in FIG. The Roman numerals indicate the phase numbers as in FIG. Hereinafter, 2 is used to generically refer to the rotor iron core, and 7 is used to generically refer to magnetic poles.

In the state shown in FIG. 3, when a current flows in the illustrated direction in the coils 9 having phase numbers I and II, the teeth 3 of the rotor core 2 are magnetized to the illustrated polarity. Then, magnetic fluxes from the permanent magnet 1 and the coil 9 flow between the teeth 3 of the rotor core 2 and the teeth 8 of the magnetic poles 7 as shown by solid lines and dotted lines, respectively.

That is, the magnetic fluxes are strengthened in the I phase and the IV phase, and weakened in the II phase and the III phase. As a result, the teeth 3 of the rotor core 2 and the teeth 8 of the magnetic pole 7 of the phase numbers I and IV are the same as described with reference to FIG.
During this period, a driving torque is generated by the suction force, and the rotor 5 makes a pitch 1/4 rotation of the teeth 3 and is stopped by the largest suction force of the I phase. And II phase is I phase before operation, III phase is II
Phase IV and III are in the same state as III and IV, respectively. Therefore, next, if the currents in the same directions as those applied to the current I-phase and II-phase are applied to the II-phase and the IV-phase, respectively, the pitch will be 1/4 rotation again. If this is repeated continuously, the phase moves cyclically and the rotor 5 continuously rotates. As can be seen from the above description, the current direction in one phase is bidirectional, and the so-called bipolar drive or the unipolar drive method using the coil 9 provided with the center tap is employed as in the conventional case. .

In the above embodiment, the teeth 3 of the rotor cores 2-1, 2-2, 2-3, 2-4 are sequentially displaced, but the rotor cores 2-1, 2-2 are oppositely arranged. , 2-3,2-4 teeth 3 have the same phase, stator 1
The teeth 8 of each magnetic pole 7 of 0 may be sequentially shifted.

[Effects of the Invention] As described above, the present invention is effective for the rotor 5 and the stator 10.
The rotor 5 has a rotary shaft 4 and four rotor cores 2-1, 2-2, 2-3, which are sequentially arranged in the longitudinal direction of the rotary shaft 4.
2-4 and a permanent magnet 1, and these rotor cores 2-1, 2
-2,2-3,2-4 have teeth 3 respectively, and the two inner rotor cores 2-2,2-3 are connected via the permanent magnet 1, and the stator 10 has a stator core 6A, 6B has a coil 9 wound around it, and is arranged symmetrically with respect to the rotating shaft 4 of the rotor 5. The stator cores 6A, 6B have magnetic poles 7-1A, 7-2 having teeth 8 respectively.
A; 7-3A, 7-4A; 7-1B, 7-2B; 7-3B, 7-4B, and rotor 5 and stator 10 are rotor cores 2-1, 2-2, 2-3 , 2-
4 teeth 3 and magnetic poles of stator 10 7-1A, 7-2A; 7-3A, 7-4A; 7-1B,
7-2B; teeth 8 of 7-3B, 7-4B are formed at the same pitch, and teeth 3 of rotor cores 2-1, 2-2, 2-3, 2-4 and magnetic poles 7-1A, 7 -2A; 7-3
A, 7-4A; 7-1B, 7-2B; 7-3B, 7-4B, the facing relationship with the tooth 8 is relatively sequentially shifted by 1/4 pitch, so it is thin It is possible to reduce the size of the device.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are schematic plan views and side sectional views thereof, and FIG. 3 is an operation of the embodiment shown in FIGS. FIG. 4 (a) and FIG. 4 (b) are a longitudinal sectional view and a sectional view taken along the line AA of a conventional four-phase hybrid type pulse motor, and FIG. It is a deployment model figure for operation explanation of a figure. In the figure, 1 is a permanent magnet, 2-1, 2-2, 2-3, 2-4 are rotor cores,
3, 8 are teeth, 4 are rotary shafts, 5 are rotors, 6A and 6B are stator cores, 7-1A, 7-2A; 7-3A, 7-4A; 7-1B, 7-2B; 7-3B, 7-4B is a magnetic pole, 9 is a coil, 10 is a stator, and 11 is a bearing.

Claims (1)

[Claims] 1. A pulse motor having a rotor (5) and a stator (10), the rotor (5) being arranged in succession in the longitudinal direction of the rotary shaft (4). 4 rotor cores (2-1, 2-2,
2-3,2-4) and a permanent magnet (1), and these rotor cores (2-1,2-2,2-3,2-4) each have teeth (3) , And the two inner rotor cores (2-2, 2-3) are coupled via the permanent magnet (1), and the stator (10) has the stator cores (6A, 6B) winding the coil (9). The stator cores (6A, 6B) are arranged symmetrically with respect to the rotation axis (4) of the rotor (5), and the stator cores (6A, 6B) have magnetic poles (7-1A, 7-2A; 7-3A, 7-3A, 7-4A; 7-1B, 7-2B; 7-3B, 7-4B), and the rotor (5) and the stator (10) are the rotor core (2-1,
2-2,2-3,2-4) teeth (3) and stator (10) magnetic poles (7-1
A, 7-2A; 7-3A, 7-4A; 7-1B, 7-2B; 7-3B, 7-4B) and the teeth (8) are formed at the same pitch, and the rotor core (2-1 , 2-2,2-
3,2-4) teeth (3) and magnetic poles (7-1A, 7-2A; 7-3A, 7-4A; 7-1B,
7-2B; 7-3B, 7-4B) is a pulse motor in which the facing relationship with the tooth (8) is sequentially shifted by 1/4 pitch.