JP2001268871A - Smooth armature winding type ac servomotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smooth armature winding type AC servomotor which can reduce a cogging torque without the cost increase. SOLUTION: This smooth armature winding type AC servomotor has a stator S with p poles which comprises a cylindrical stator core 1 and armature windings 2 forming a rotary magnetic field which are wound on the inner circumferential surface or outer circumferential surface of the stator core 1, and a permanent magnet type rotor R which faces the armature windings 2 in radial directions with gaps. If the stator core 1 is divided into N divisions and (a) is an arbitrary integer, a following equation is satisfied: N≠a×p.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smooth armature winding type AC servomotor such as a gap winding motor.

[0002]

2. Description of the Related Art A conventional smooth armature winding type AC servomotor, for example, a gap winding motor is shown in FIG.
Prior art). In the figure, S is a stator, 1A is a ring-shaped stator core, 2 is an armature winding mounted on the inner peripheral surface of the stator core 1A, and R is opposed to the armature winding 2 via a gap. The permanent magnet type rotor of the adduction type is arranged so that the permanent magnet 4 is attached to the outer peripheral surface of the ring-shaped rotor yoke 3. In the case of a gap winding motor, the cogging torque is ideally prevented from being generated by fixing the armature winding 2 to the perfectly round stator core 1A.

[0003]

In this case, there is no problem in the shape of the iron core which causes the cogging torque, and it is possible to suppress the generation of the cogging torque. However, the shape of the stator iron core 1A is ring-shaped. For this reason, many parts of the iron core material are wasted, which is a factor of cost increase. Therefore, there is a motor in which the stator core 1B is divided and configured as shown in FIG. 3 (second prior art) in order to suppress an increase in cost. In this case, the stator core 1B can be manufactured from an elongated strip-shaped core, which is advantageous in terms of cost, and the projections 5 of the bent portions are formed on the outer peripheral surface of the split stator core 1B. Although there is an advantage that a countermeasure against rotation of the stator core 1B can be taken, there is a problem that the cogging torque increases due to the presence of a gap at the connecting portion between the divided portions of the stator core 1B. The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a smooth armature winding type AC servomotor capable of reducing cogging torque without increasing cost. is there.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method of fixing a p-pole in which an armature winding for forming a rotating magnetic field is mounted on the inner or outer peripheral surface of a cylindrical stator core. Armature winding type AC provided with a permanent magnet rotor so as to radially oppose the armature and the armature winding via a gap.
In the servo motor, when the stator core is configured by being divided, and the number of divisions is N, a is an arbitrary integer,
The relationship is set to N ≠ a × p.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. It is a front sectional view showing the upper half part of a smooth armature winding type AC servomotor in an example of the present invention. The basic configuration of the present invention is almost the same as the second prior art shown in FIG. 2, but in the present invention, when the number of divided stator cores 1 is N and a is an arbitrary integer. And N ≠ a × p. Thereby, when the stator core 1 is divided at equal pitches, an increase in cogging can be suppressed. Further, when a slit 6 is formed in the inner peripheral surface of the stator core 1 which is a mounting surface of the armature winding 2 and the total number of slits is M, the relationship is (N × M) ≠ a × p. Like that. Thus, the order of the cogging torque can be increased, and the cogging torque can be reduced. When the stator core 1 is divided at an unequal pitch, the cogging torque can be reduced by determining the division position so that the cogging torque waveform generated by the core gap cancels out. The above embodiment shows a case where the present invention is applied to a smooth armature winding type AC servomotor in which a permanent magnet type rotor is an inverting type. The same applies to the case of a child winding type AC servomotor.

[0006]

As described above, according to the present invention, there is a great effect that both the cogging torque and the manufacturing cost of the smooth armature wound AC servomotor can be reduced.

[Brief description of the drawings]

FIG. 1 shows a smooth armature winding type A according to an embodiment of the present invention.
It is a front sectional view showing the upper half part of C servomotor.

FIG. 2 shows a smooth armature winding type A according to the first prior art.
It is a front sectional view showing C servo motor.

FIG. 3 shows a smooth armature winding type A according to a second prior art.
It is a front sectional view showing C servo motor.

[Explanation of symbols]

 S stator, 1 stator core, 2 armature winding, R permanent magnet type rotor, 3 rotor yoke, 4 permanent magnet, 5 protrusion, 6 slit

Claims (2)

[Claims] 1. A p-pole stator in which an armature winding for forming a rotating magnetic field is mounted on an inner peripheral surface or an outer peripheral surface of a cylindrical stator core, and a radial direction is formed through a gap with the armature winding. Armature winding type AC provided with permanent magnet type rotor to face
In the servo motor, the stator core is configured by being divided, and the number of divisions is N,
A smooth armature winding type AC servomotor, wherein a is an integer and N ≠ a × p. 2. The method according to claim 1, wherein a plurality of slits are provided on a winding mounting surface of the stator core, and when the total number of slits is M, (N × M) ≠ a × p. 4. The smoothed armature winding type AC servomotor according to claim 1.