Twelve-phase permanent magnetic synchronous motor fault tolerance control method based on output maximum torque

A technology of permanent magnet synchronous motor and maximum torque, which is applied in motor control, motor generator control, electronic commutation motor control, etc. It can solve the problems of unbalanced current amplitude and inability to guarantee maximum torque output, etc.

Inactive Publication Date: 2018-12-07
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the current amplitude of each phase is seriously unbalanced and the maximum torque output cannot be guaranteed under the fault-tolerant control method of the stator copper consumption minimum mode, and to provide a method that improves the reliability and fault tolerance of the system and ensures the output of the motor. Fault-tolerant control method of twelve-phase permanent magnet synchronous motor based on maximum torque output

Method used

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  • Twelve-phase permanent magnetic synchronous motor fault tolerance control method based on output maximum torque
  • Twelve-phase permanent magnetic synchronous motor fault tolerance control method based on output maximum torque
  • Twelve-phase permanent magnetic synchronous motor fault tolerance control method based on output maximum torque

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Embodiment 1

[0056] A fault-tolerant control method for a twelve-phase permanent magnet synchronous motor based on the maximum output torque, the method includes the following steps: (1) Considering the n-phase motor as a whole, dividing each variable in the motor into α that participates in electromechanical energy conversion The model of the twelve-phase permanent magnet synchronous motor is established in the -β plane and in other planes that have nothing to do with electromechanical energy conversion; (2) According to the principle of constant total magnetic potential, keep the system decoupling transformation matrix unchanged, and obtain the twelve-phase motor The expressions of the remaining phase currents in the maximum torque output mode during open-phase operation; (3) The expressions of the currents of each phase are After the static coordinate transformation, the size of the current that needs to be injected into the corresponding harmonic sub-plane can be calculated.

Embodiment 2

[0058] According to the fault-tolerant control method of the twelve-phase permanent magnet synchronous motor based on the maximum output torque described in embodiment 1, the n-phase motor is regarded as a whole, and each variable in the motor is divided into α- The specific process in the β plane and other planes that have nothing to do with electromechanical energy conversion is as follows: The Clark transformation matrix of n-phase symmetric polyphase motor is given:

[0059]

[0060] in: is the electrical angle between every two sets of windings;

[0061] The value of m is related to the phase number of the motor, when is an even number, ,when is an odd number, , and the last row of vectors shown in formula (1) will not exist;

[0062] When the stator and rotor magnetic potentials are sinusoidally distributed, the first two rows of vectors correspond to the α-β subspace, which corresponds to the fundamental flux linkage and torque components, which are the sam...

Embodiment 3

[0064] According to the fault-tolerant control method of the twelve-phase permanent magnet synchronous motor based on the maximum output torque described in embodiment 1 or 2, it is characterized in that: the specific process of establishing the model of the twelve-phase permanent magnet synchronous motor is: the stator is formed by Four sets of Y-connected three-phase symmetrical windings, A 1 B 1 C 1 For the first set of windings, A 2 B 2 C 2 For the second set of windings, A 3 B 3 C 3 For the third set of windings, A 4 B 4 C 4 It is the fourth set of windings, and the four sets of windings have a spatial difference of 15° in electrical angle. For the convenience of analysis, the following assumptions are made:

[0065] (1) The armature reaction magnetic field generated by the stator winding and the excitation magnetic field generated by the rotor permanent magnet are both sinusoidally distributed in the air gap;

[0066] (2) Neglect the magnetic saturation of the...

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Abstract

The invention provides a twelve-phase permanent magnetic synchronous motor fault tolerance control method based on output maximum torque. The amplitude of each phase of current is severely unbalancedunder the fault tolerance control method where the copper loss of a stator is smallest, so output of the maximum torque is not ensured when the copper loss of the stator is smallest. The method comprises steps of (1) regarding n phases of motors into a whole, and dividing variables in the motor into two parts, wherein one part is arranged in the alpha-beta plane to participate in the electromechanical energy conversion and another part is in other planes to be irrelevant to the electromechanical energy conversion so as to establish a model of a twelve-phase permanent magnetic synchronous motor; (2) according to the rule that the total magnetic potential is unchanged, keeping the system decoupling conversion array to be unchanged so as to obtain an expression of rest each phase of the current under the maximum torque output mode during phase deficient operation of the twelve-phase motor; and (3) carrying out static coordinate conversion on the expression of each phase of the current, and calculating the volume of to-be-injected current of the corresponding harmonic wave sub-plane.

Description

Technical field: [0001] The invention relates to the field of motor control, in particular to a fault-tolerant control method for a twelve-phase permanent magnet synchronous motor based on output maximum torque. Background technique: [0002] With the continuous expansion of the application of motor drive systems in military, industrial and other fields, stable and reliable motor drive systems are particularly important for occasions with high reliability requirements such as aircraft and electric vehicles. To achieve system requirements through fault-tolerant control, improve system reliability, and reduce or avoid losses caused by failures has become the key to ensure system reliability. Therefore, the high-reliability fault-tolerant control method of permanent magnet motors has received extensive attention. It is an important application feature of multi-phase motors to be suitable for fault-tolerant operation. Various open-circuit and short-circuit faults in the motor dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P29/024H02P29/028
CPCH02P21/14H02P29/0243H02P29/032
Inventor 高晗璎陈卓马骏杰
Owner HARBIN UNIV OF SCI & TECH
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