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A method for calibrating torque of permanent magnet synchronous motor of electric vehicle
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A technology of permanent magnet synchronous motor and calibration method, which is applied in motor generator control, motor control, AC motor control and other directions, can solve the problems of difficult to accurately estimate the zero position of the motor rotor, difficult to estimate the parameters in real time and error, etc.
Active Publication Date: 2018-12-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0003] However, the permanent magnetsynchronous motor is a complex controlled object with nonlinear, strong coupling, and time-varying parameters. Electromagnetic parameters such as stator resistance, rotor flux linkage, direct-axis inductance, and quadrature-axis inductance will change with the working conditions during the operation of the motor. and these parameters are usually difficult to accurately estimate in real time. In addition, the zero position of the motor rotor used for control is also difficult to accurately estimate. These factors will lead to an error between the actual mechanical torque output by the motor and the expected torque.
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[0033] figure 2 It is a flow chart of a method for calibrating the torque of a permanent magnetsynchronous motor of an electric vehicle according to the present invention.
[0034] In this example, if figure 2 Shown, a kind of electric vehicle permanent magnet synchronous motor torque calibration method of the present invention comprises the following steps:
[0035] S1. Segment the full speed range of the permanent magnet synchronous motor, and the speed at the segment point is w i i=1,2,3,...,m;
[0036] S2. The electric dynamometer works in the speed mode, and the permanent magnet synchronous motor is dragged to the speed w i ; at speed w i Next, the host computer sets different desired torque Te ij , j=1,2,...,n, n is the number of expected torques, and sent to the motor drive controller;
[0037] S3. Normally, electromagnetic parameters such as rotor flux linkage, direct-axis inductance and quadrature-axis inductance are used in the closed-loop control of torque....
example
[0057] In this embodiment, a permanent magnet synchronous motor with a base speed of 3500rpm, a maximum speed of 8000rpm, a rated power of 30kW, a peak power of 60kW, a rated torque of 82N·m and a maximum torque of 180N·m is used as the test prototype. .
[0058] The closed-loop control of the torque is realized by the closed-loop control of the expected torque current, and its principle is as follows: figure 1 as shown, figure 1 The reference numerals in are respectively represented as: torque current conversion module 1, excitation current loop regulator module 2, Park inverse conversion module 3, SVPWM module 4, three-phase inverter module 5, permanent magnet synchronous motor 6, torque A current loopregulator module 7 , a Park transformation module 8 , and a Clark transformation module 9 .
[0059] according to figure 2 The flow shown is for the torque calibration of the permanent magnet synchronous motor of electric vehicles: the electric dynamometer works in the spe...
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Abstract
A method for calibrating torque of permanent magnet synchronous motor of electric vehicle, in rotational speed mode, the permanent magnet synchronous motor is dragged to different rotational speeds, Then, taking the measured rotational speed and the measured mechanical torque as independent variables before calibration and the expected torque as dependent variable, the bivariate quadratic polynomial fitting is performed to obtain the polynomial fitting coefficients as torque calibration coefficients, and the torque calibration coefficients are used to calibrate the permanent magnet synchronousmotor of electric vehicles. The calibration method is easy to operate, the calibration result is accurate, and the computational complexity of the motor drive controller is reduced.
Description
technical field [0001] The invention belongs to the technical field of electric vehicles, and more specifically relates to a method for calibrating the torque of a permanent magnet synchronous motor of an electric vehicle. Background technique [0002] In the application of electric vehicles, the vehicle controller calculates the torque required for vehicle operation in real time according to the pedal depth, brakes, and vehicle operating conditions during the operation of the electric vehicle, and sends this torque as the expected torque. To the motor drive controller, the motor drive controller controls the motor to output corresponding mechanical torque according to the expected torque, and realizes the closed-loop control of torque. For the sake of reliability, the electric vehicle drive system usually does not install a torque sensor, but calculates the torque current value according to the expected torque in the motor drive controller through the formula calculation me...
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