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High-winding-factor permanent magnet brushless motor and design and fault-tolerant control method

A permanent magnet brushless motor, high winding technology, applied in motor control, AC motor control, single motor speed/torque control, etc.

Active Publication Date: 2017-01-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of fault-tolerant teeth brings back electromotive force with rich harmonic content, and the motor adopts a four-phase motor with a phase belt angle of 90°, so that the motor can only be used in the open circuit fault state. The normal phases with a mutual difference of 90° are used to implement the compensation algorithm, which requires a larger-capacity inverter to implement the fault-tolerant algorithm

Method used

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  • High-winding-factor permanent magnet brushless motor and design and fault-tolerant control method

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Embodiment 1

[0115] The motor of the present invention is a permanent magnet brushless motor with fractional slot concentrated winding. The permanent magnet adopts a surface-mounted type, and the Halbach magnetization method is used. The armature winding is located in the armature slot on the stator. Two sets of windings belonging to different phases are placed in each armature slot; the permanent magnet has 3 pairs of poles; what the motor of the present invention adopts is a fractional slot concentrated winding structure. According to the definition of electromechanics, the number of slots per pole and phase z is the number of armature slots, p is the number of pole pairs, and m is the number of phases, so the number of slots per pole and phase of the motor described in the present invention Slot angle Therefore, assuming that No. 1 slot is at 0°, then No. 2 slot is at 3*45°=135°; No. 3 slot, No. 4 slot, No. 5 slot, No. 6 slot, No. 7 slot, 8 The number slots are counterclockwise and ...

Embodiment 2

[0117] According to the method of calculating the winding coefficient of the fractional slot concentrated winding, because the motor is a fractional slot motor, the formula for calculating the winding coefficient in electromechanics cannot be used. The fractional slot motor must first be found to be equivalent to an integer slot motor. Calculate the winding factor. The 8 slots and 6 pole motors proposed by the present invention are equivalent to each unit motor, because the number of armature slots is 8, and the number of permanent magnet poles is 6, and the motor is originally a unit motor (unit motor: the number of armature slots and The greatest common divisor of pole pairs is 1). Therefore, according to the method introduced in "Permanent Magnet Brushless DC Motor Technology", the number of slots per pole and each phase can be q=1 / 3, and the slot pitch angle is 135° fractional slot concentrated winding motor. Therefore, the fractional slot motor described in the present i...

Embodiment 3

[0126] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in combination with the derivation process in the embodiments of the present invention. Now assuming that phase A is open, give the specific steps of the open circuit fault tolerance algorithm

[0127] Under normal circumstances, the current of each phase can be given by the following formula:

[0128] i a =I m sin(ωt)

[0129] i b =I m sin(ωt-pi / 4)

[0130] i c =I m sin(ωt-pi / 2)

[0131] i d =I m sin(ωt-3*pi / 4)

[0132] Where: ωt is the angular frequency, i a , i b , i c , i d is the expression of each phase current, I m is the current amplitude of each phase, pi=180°. Then the expression of magnetomotive force of each phase is:

[0133] MMF a = 1 2 Ni a s i n ( θ )

[0134] ...

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Abstract

The invention discloses a high-winding-factor permanent magnet brushless motor and a design and fault-tolerant control method. The high-winding-factor permanent magnet brushless motor comprises a stator, an armature winding, a rotor and a permanent magnet, wherein an armature groove is formed in the stator, and the armature winding is placed in the armature groove; double-layer winding is adopted. An air gap is arranged between the stator and the rotor, and a permanent magnet is attached to the surface of the rotor, and is magnetized by using a Halbach array structure. The motor is an eight-phase motor, and phases are evenly distributed at a phase belt angle of 45 degrees; after the phases are distributed, four phase line terminals and a common neutral point are led out. The single-phase open-circuit fault-tolerant algorithm of the motor of the invention solves the problem that the fault-tolerant algorithm can be implemented only by utilizing the phase which and the fault phase has a difference of 180 degrees when the ordinary four-phase motor is in a single-phase open-circuit fault state, and the capacity of an inverter and the insulation rating of the motor winding can be reduced by the fault-tolerant control strategy of the motor. Finally, the motor of the invention and the control algorithm have good fault-tolerant effects, and the average torque after fault tolerance is basically consistent with that in the normal operation.

Description

technical field [0001] The invention relates to a permanent magnet brushless motor and a permanent magnet brushless motor design method for obtaining a larger winding coefficient and a compensation control algorithm for the motor open circuit fault state, applicable to the fields of aerospace and new energy vehicles, and belongs to motor manufacturing and control technology. Background technique [0002] The permanent magnet brushless motor has the characteristics of small size, high efficiency, high power factor, large starting torque, and low temperature rise, while the traditional permanent magnet brushless motor generally uses distributed windings, which can weaken the high-order generated by the non-sinusoidal distribution of the magnetic pole magnetic field. Harmonic potential; reduces the pulse amplitude of each pole magnetic flux caused by the change of air gap permeability, reduces the pulse vibration loss on the surface of the magnetic pole; can effectively weaken ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/16H02K3/28H02P6/08
CPCH02K3/28H02K21/16H02P6/08H02K1/2783H02P25/22H02P2207/05H02P27/06H02K19/10H02P25/092
Inventor 赵文祥陶涛朱纪洪吉敬华胡德水
Owner JIANGSU UNIV
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