Magnetic Field Calculation Method of Built-in Permanent Magnet Synchronous Motor Based on Rotor Magnetic Potential Model
A permanent magnet synchronous motor, magnetic field calculation technology, applied in the manufacture of motor generators, electromechanical devices, electrical components, etc., can solve the problems of complex rotor structure, rotor magnetic isolation bridge area, difficulty in determining the air gap inverse function, etc., and achieve performance analysis. The effect of fast, fast calculation, fast and accurate calculation
Active Publication Date: 2022-04-08
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology
For built-in motors, it is difficult to determine the inverse function of the air gap due to the complex structure of the rotor and the saturation phenomenon in the rotor magnetic isolation bridge area
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[0034] The method for calculating the magnetic field of the interior permanent magnet synchronous motor based on the rotor magnetic potential model of the present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.
[0035] The magnetic field calculation method of the built-in permanent magnet synchronous motor based on the rotor magnetic potential model of the present invention comprises the following steps:
[0036] 1) Decompose the three-phase current of the motor into the d-axis component and the q-axis component, and use the winding function to solve the magnetomotive force of the motor stator; where,
[0037] The described motor three-phase current is decomposed into d-axis component and q-axis component, is to adopt the following formula:
[0038]
[0039] In the formula, I is the current amplitude; ω is the electrical angular frequency; is the initial phase angle of the current; t is the time.
[0040] Th...
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A method for calculating the magnetic field of a built-in permanent magnet synchronous motor based on the rotor magnetic potential model: the three-phase current of the motor is decomposed into the d-axis component and the q-axis component; the d-axis rotor is established when the d-axis component of the stator current and the permanent magnet magnetic field work together Magnetic potential model; establish the corresponding d-axis equivalent magnetic circuit model; establish the q-axis rotor magnetic potential model when the q-axis component of the stator current acts alone considering the influence of the d-axis magnetic field; establish the q-axis component of the stator current considering the influence of the d-axis magnetic field The q-axis equivalent magnetic circuit model when acting alone; according to the d-axis rotor magnetic potential model and the q-axis rotor magnetic potential model, the total rotor magnetic potential model when the d-axis magnetic field and the q-axis magnetic field work together is derived; stator magnetomotive force Iteratively solves the magnetomotive force on the inner surface of the stator with the total rotor magnetic potential model, and corrects the total rotor magnetic potential model; and solves the motor magnetic field, back EMF and torque. The invention can accurately calculate the magnetic field of the built-in permanent magnet synchronous motor.
Description
technical field [0001] The invention relates to a method for calculating the magnetic field of a synchronous motor. In particular, it relates to a method for calculating the magnetic field of an interior permanent magnet synchronous motor based on a rotor magnetic potential model. Background technique [0002] Built-in permanent magnet synchronous motors are widely used in many industrial fields such as electric vehicles, urban rail trains, and aerospace because of their high power density and wide speed range. Accurately calculating the magnetic field distribution in the motor is the prerequisite for accurately predicting the electromagnetic performance of the motor and judging the rationality of the motor design. However, the built-in permanent magnet synchronous motor has a complex rotor structure, and the magnetic field distortion is serious due to the saturation of the iron core and the cross-coupling of the d and q axes, especially when the motor is running under load...
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IPC IPC(8): H02K15/00G06F30/20
CPCH02K15/00G06F30/20
Inventor 夏长亮吴霜史婷娜王慧敏郭丽艳王志强
Owner TIANJIN POLYTECHNIC UNIV