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An ironless double stator motor

An ironless, double-stator technology, applied in electrical components, electromechanical devices, magnetic circuit shape/style/structure, etc., can solve the problems of low torque density, large torque ripple, large space harmonics of magnetomotive force, etc. , to achieve the effect of reducing torque ripple, increasing torque density, and low harmonic content of air gap density

Active Publication Date: 2017-12-22
黄山市开发投资集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For small multi-pole motors, the number of stator slots of the motor is small, and there is a defect that the space harmonics of the magnetomotive force are large, which leads to problems such as large torque ripple and low torque density.

Method used

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  • An ironless double stator motor
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  • An ironless double stator motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Select a coreless double-stator motor with poles 2P=22, select the number of inner and outer stator slots as Z=30, and the slot number phase diagram and three-phase slot number phase distribution are as follows figure 2 shown. It is obvious that the stator winding is connected with a 60° phase belt, and the distribution coefficient of the winding is relatively high.

[0021] First, the outer stator windings are arranged, and the phase difference of the coil sides on the outer stator passes through the coil pitch y 1 and y 2 The value of is determined, then y 1 The value satisfies the formula: π / 21 / z2 The value satisfies the formula: π / 22 / z1 The value of the remainder of / z to 2π approaches π, 2πpy 2 The value of the remainder of / z to 2π tends to π, so as to ensure that the phase difference between the two coil sides of the same set of winding coils is 90-270 degrees electrical angle, preferably close to 180 degrees. Select the pitch y of one of the...

Embodiment approach 2

[0034] Embodiment 2: Select a motor with 26 poles / 36 slots, and the phase diagram of its slot number is as follows Figure 5 shown, according to y 1 ≠y 2 , then y 1 Satisfies the formula: 2πpy 1 The value of the remainder of / z to 2π approaches π; y 2 The value satisfies the formula: 2πpy 2 The value of the remainder of / z to 2π tends to π, so as to ensure that the phase difference between the two coil sides of the same coil is about 180 degrees. Then choose a pitch y of the outer stator winding 1 =1, the corresponding number of coil turns N 1 =10, choose another pitch y 2 =4, the corresponding number of coil turns N 2 =25, the slot numbers contained in each phase are as follows Figure 6 As shown, they are connected in series in turn to form a complete three-phase winding of A, B, and C.

[0035] Table 2 shows the comparison of the magnetomotive force harmonic analysis results of the 26-pole / 36-slot single-pitch equal-turn winding structure and the 26-pole / 36-slot d...

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Abstract

The invention discloses a coreless double-stator motor. The coreless double-stator motor comprises an internal stator, an external stator and a rotor. The slot number of the internal stator and the slot number of the external stator are both Z, and the number of pole-pairs of the internal stator and the number of pole-pairs of the external stator are both P. The external stator is provided with two windings which are connected in series with each other and respectively have winding coil pitches of y1 and y2. The coil pitch y1 of the first winding is not equal to the coil pitch y2 of the second winding, and the phase difference between the two coil edges of the coil of the same winding is 90 to 270 electrical degrees. According to the coreless double-stator motor, a conventional stator winding with a single pitch equally-numbered turns is changed into a stator winding with double pitches and unequally numbered turns according to a harmonic wave principle, such that the magnetomotive amplitude of harmonic waves similar to fundamental waves in the magnetomotive harmonic waves of the stator winding is reduced.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to an ironless double-stator motor. Background technique [0002] The permanent magnet double stator motor is a new type of motor developed with the development of the permanent magnet material NdFeB with excellent magnetic properties. At present, the commonly used structural forms are disc type and concentric type. The research on the disc-type double-stator permanent magnet motor is the most extensive, and there are many structural forms. The double-stator double-air-gap structure composed of double-stator intermediate rotors can make the motor obtain the smallest moment of inertia and optimal heat dissipation conditions. In the case of permanent magnets with the same volume, not only the uniformity of the air gap flux density under the pole surface is improved, but also the air gap flux density of the double-sided permanent magnet structure can be higher than that of the single-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K16/04H02K1/12H02K1/27
Inventor 阚超豪汪晶任泰安储国良朱晓威
Owner 黄山市开发投资集团有限公司