Permanent magnet synchronous motor output torque estimation method and system

A permanent magnet synchronous motor and output torque technology, which is applied in the estimation/correction of motor parameters, control systems, motor control, etc., can solve problems affecting the estimation accuracy of output torque, increase system cost, improve accuracy, and ensure calculation The effect of precision

Active Publication Date: 2020-08-07
BEIJING ELECTRIC VEHICLE
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  • Claims
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Problems solved by technology

[0004] The embodiment of the present invention provides a method and system for estimating the output torque of a permanent magnet synchronous motor, which is used to solve the problem that the perturbation of the permanent magnet synchronous motor will affect the accuracy of the output torque estimation under low speed conditions

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  • Permanent magnet synchronous motor output torque estimation method and system
  • Permanent magnet synchronous motor output torque estimation method and system
  • Permanent magnet synchronous motor output torque estimation method and system

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Aiming at the problem that the perturbation of the motor parameters of the permanent magnet synchronous motor will affect the estimation accuracy of the output torque under the low speed working condition, the invention provides a method and system for estimating the output torque of the permanent magnet synchronous motor.

[0042] Such as figure 1 As shown, an embodiment of the present invention provides a method for estimating output torque of a permanent magnet synchronous motor, including:

[0043] Step 11, when the permanent magnet synchronous motor is in a predefined low-speed working condition, obtain motor parameters, wherein the motor parameters include: the current speed of the motor, the current temperature of the motor, the curren...

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Abstract

The invention provides a permanent magnet synchronous motor output torque estimation method and system, and relates to the technical field of automobiles. The method comprises the steps of obtaining motor parameters when a permanent magnet synchronous motor is in a predefined low-rotating-speed working condition; inputting the motor parameters and the current torque command into a pre-trained radial basis function (RBF) neural network to obtain an output torque; and performing Kalman filtering on the output torque to obtain a corrected output torque. According to the invention, the nonlinear relationship between motor parameters and output torque is solved by introducing an RBF neural network while a method for obtaining training data is provided, so that the calculation precision of the neural network is ensured, and Kalman filtering is introduced to process the output torque so as to further improve the precision; and the scheme does not involve the change of system hardware, so thatthe system cost is not increased.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and system for estimating output torque of a permanent magnet synchronous motor. Background technique [0002] Pure electric vehicles drive the wheels through motors to achieve vehicle driving. With the development of permanent magnet materials, power electronics technology, control theory, motor manufacturing and signal processing hardware, permanent magnet synchronous motors (PMSM) have been widely used. Permanent magnet synchronous motors are due to With the advantages of high efficiency, high output torque, high power density and good dynamic performance, it has become the mainstream of pure electric vehicle drive system. Safety and reliability are the basic requirements for the normal operation of pure electric vehicles. For the driving system (including the motor and motor controller) in the vehicle, the correct, effective and safe realization of its function i...

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Application Information

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IPC IPC(8): H02P6/00H02P23/14H02P23/00
CPCH02P6/00H02P23/14H02P23/0018H02P2207/05
Inventor 李玮刘超梁海强
Owner BEIJING ELECTRIC VEHICLE
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