JPH04200258A - Motor - Google Patents

Abstract

PURPOSE:To improve the effective value of torque, and reduce the unevenness in rotation by arranging adjacent a pair of coils of other two phases on both sides of an adjacent pair of coils of the same phase, and winding a pair of coils of each phase in mutually opposite polarities. CONSTITUTION:The coils of the same phase are wound, in mutually opposite polarities, on each set of adjacent three sets of stator teeth 12 placed at every 120 deg. of central angle, and those are put in alternate polarities in order as a whole. Hereby, the maximum value of the torque arising corresponding to the each single phase drops, and also the change ratio in the vicinity of each maximum value becomes gentle. Therefore, for the torque by three phases, the ratio of the magnitude of the torque ripple of the maximum value becomes small. What is more, to raise the effective value of the torque, it will enough to improve the torque constant, for example, by increasing the number of turns of each oil, and even in that case, the torque ripple can be suppressed to a low level.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a motor equipped with a three-phase, six-pole armature with one pole and one coil, and an eight-pole field means with alternating polarity.

[Prior Art] Conventionally, a motor is equipped with a three-phase, six-pole armature with one pole and one coil, and an eight-pole field means of alternating polarity that is provided to be rotatable relative to the armature. Examples of motors in which poles are substantially evenly arranged in a circular manner in each of the field means are shown in FIG. 4, which is a schematic plan view, and FIG. 5, which is a conceptual diagram of the motor.

In this conventional motor, a stator 104 (armature) including a stator core 100 and a winding 102 wound thereon, and a rotor magnet 106 are both substantially rotationally symmetrical, with 180-degree symmetrical positions. A pair of coils 120 having the same phase and having the same polarity are wound around the pair of stator teeth 108 . ■ to ■ in Figures 4 and 5
indicate slots of stator core 100, respectively. Fifth
(1), (I[) and (III) in the figure indicate the arrangement and winding polarity of each coil in each phase, and CW
CCW indicates clockwise rotation when viewed from the outside, and CCW indicates counterclockwise rotation when viewed from the outside. Also, (MG
) are rotor magnets 10 and 10, respectively.
6 shows the polarity of the inner circumferential side.

[Problems to be Solved by the Invention] With this conventional motor, the maximum value and effective value of the generated torque can be relatively large, but the torque around the maximum value of the torque generated in each single phase is Since the rate of change is relatively high, the torque ripple of the combined torque of the three phases becomes large, which tends to have a relatively negative effect on rotational unevenness.

The present invention has been made in view of the above-mentioned problems existing in the prior art, and its purpose is to flatten the torque generation distribution and increase torque while suppressing torque ripple to a low level. It is an object of the present invention to provide a motor that can increase the effective value of and reduce rotational unevenness.

[Means for Solving the Problems 1] In order to achieve the above object, the motor of the present invention has one pole and one pole.
Equipped with a 3-phase 6-pole armature with coils, and an 8-pole field means with alternating polarity that is rotatable relative to the armature,
A motor in which a plurality of poles are arranged substantially evenly in a circular manner in each of the armature and the field means, wherein the armature has a pair of adjacent coils of the same phase on both sides of each of the coils of the same phase. Two-phase coils are provided, and a pair of adjacent coils of each phase are wound with opposite polarities.

[Operation] Since the multiple poles are arranged substantially evenly in a circular manner in each of the armature and the field means, the multiple poles of the armature have a central angle of 6
At every 0 degrees, the multi-poles of the field means are located at every 45 degrees of central angle. The multi-poles of this field means are arranged in alternating polarity, and the armature is composed of one pole and one coil, and a pair of adjacent coils of the same phase are wound with mutually opposite polarities, and a pair of adjacent coils are wound with opposite polarity. Since a pair of other two-phase coils are arranged on each side of the same-phase coil, the torque generated corresponding to each single phase has a maximum value that is at a slightly low level, and around each maximum value. The rate of change in is relatively slow. As a result, the ratio of the torque ripple to the maximum value of the three-phase torque becomes small.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 to 3 all relate to an embodiment of the motor of the present invention. FIG. 1 is a schematic plan view of the motor, FIG. 2 is an expanded conceptual diagram of the motor shown in FIG. 1, and FIG. 3 is a schematic diagram of torque waveforms.

1o is a stator core. The stator core 10 has six slots and six stator teeth 12, and has substantially six-fold rotational symmetry. ■ in Figures 1 and 2
. . . , . . . , . . . , . . . . . . . . . . . . . . , stator core 10 , stator core 10 slots.

The stator core 10 has three-phase driven winding #i14.16.
．． 18 has been applied. One coil 20 is wound around each stator tooth 12 to constitute one pole, so that the multiple poles are substantially evenly arranged in a circular manner at every 60 degrees of center angle.

Coils 20 of the same phase are wound in mutually opposite polarities in each of three sets of adjacent stator teeth 12 arranged at a center angle of 120 degrees, and the polarities as a whole are sequentially alternated. (1), (II), and (Illll) in FIG. 2 indicate the arrangement and winding polarity of each coil 20 in each phase, and CW
CCW indicates clockwise rotation when viewed from the outside, and CCW indicates counterclockwise rotation when viewed from the outside.

and above stator core IO and winding 14.16.1
8 constitutes a stator 22 as an example of an armature.

24 is a cylindrical rotor magnet as an example of field means. The rotor magnet 24 is rotatably and coaxially provided with respect to the stator 22 so that its inner circumferential surface faces the outer circumferential surface of the stator 22 in the radial direction.

The inner circumferential side of the rotor magnet 24 constitutes eight poles of alternating polarity, and the multiple poles are substantially evenly arranged circularly at every 45 degrees center angle.

N and S in (MG) in FIGS. 1 and 2 respectively indicate the polarity of the inner peripheral side of the rotor magnet 24. Note that FIG. 2 corresponds to the case where the stator 22 and rotor magnet 24 are in the positional relationship shown in FIG. 1.

The motor of this embodiment configured as described above has a pair of stator teeth 1 at 180-degree symmetrical positions in the way the windings are arranged.
Figures 4 and 5 are constructed in substantially the same manner except that a pair of coils 120 having the same phase as 08 are wound with the same polarity.
Compared to the conventional motor shown in the figure, the maximum value of the torque generated corresponding to each single phase is reduced, and the rate of change around each maximum value is gradual. Therefore, the ratio of the torque ripple to the maximum value of the torque due to the three phases becomes small.

Incidentally, the torque waveform of the motor of this embodiment, which uses an insulated conductor wire with a diameter of 0.19 mm and has 77 turns of winding per slot, is as shown by the solid line in the third section. The maximum and minimum torques in this case are each 2
96 g-am and 232 gcm.

On the other hand, the torque waveform of the conventional motor using an insulated conductor wire with a diameter of 0.18 mm and winding 80 ter's per slot was as shown by the solid line in FIG. 6. In this case The maximum and minimum torque of is 3 respectively.
They were 48 gcm and 236 gcm.

In order to increase the effective value of torque in the motor of the present invention, the torque constant may be improved by increasing the number of turns of each coil 20 by 1-, for example. Even in that case, the torque ripple can be suppressed to a low level.

[Effects of the Invention] In the motor of the present invention, the maximum value of the torque generated corresponding to each multiple phase decreases, and the rate of change around each maximum value becomes gradual, and the torque due to the three phases is the torque relative to the maximum value. Since the ratio of the ripple size becomes smaller, the torque generation distribution becomes flat, the effective value of torque can be increased while suppressing the torque ripple to a low level, and rotational unevenness can be reduced.

[Brief explanation of the drawing]

Figures 1 to 3 relate to one embodiment of the motor of the present invention, of which Figure 1 is a schematic plan view of the motor, and Figure 2 is a schematic plan view of the motor.
The figure is an expanded conceptual diagram of the motor shown in FIG. 1, and FIG. 3 is a schematic diagram of a torque waveform. Figures 4 to 6 relate to conventional motors,
Of these, Fig. 4 is a schematic plan view of the motor, and Fig. 5 is a schematic plan view of the motor.
The developed conceptual diagram of the motor shown in the figure, and FIG. 6 is a schematic diagram of the torque waveform. In the drawing, 1o is a stator core, 12 is a stator tooth, 20
2 is a coil, 22 is a stator, and 24 is a rotor magnet. ,′

Claims (1)

[Scope of Claims] A three-phase, six-pole armature with one pole and one coil, and an eight-pole field means of alternating polarity provided to be rotatable relative to the armature, A motor in which poles are arranged substantially uniformly in a circular manner in each of the magnetic means, and the armature includes a pair of adjacent coils of the same phase and a pair of adjacent two-phase coils on both sides of each pair of adjacent coils of the same phase. A motor characterized in that a pair of adjacent coils of each phase are wound with opposite polarities.