Novel method for flux weakening calibration of permanent-magnet synchronous motor controller for blade electric vehicle

Abstract

The invention discloses a novel method for flux weakening calibration of a permanent-magnet synchronous motor controller for a blade electric vehicle. The method comprises: (1), a data table look-up method is employed at a speed below a base speed; (2), at a high speed, when a flux weakening state is reached, MTPA data collected at a base speed are used and experiment testing is carried out to obtain a toque error between different situation; (3), an Id and Iq are added at the steps of (1) and (2) and PI controlling is carried out respectively; (4), when MTPA controlling at a speed below a base speed is employed, a table look-up method is used; (5), in flux weakening control, the difference between the high speed and the base speed is reflected by an iron loss and a rotational inertia and a compensation method based on a formula of y=kx+b is introduced; and (6), PI control is realized at three kinds of stages: a low-speed stage, a middle-speed stage, and a high-speed stage. The method has the following advantages: different speeds are decomposed into three parts and different PI parameters are set respectively for different parts, so that control flexibility and practicability are enhanced; and a torque error caused by flux weakening can be compensated linearly.

Description

technical field [0001] The invention relates to a new method for field-weakening calibration of a permanent magnet synchronous motor controller of a pure electric vehicle, belonging to the technical field of electric vehicles. Background technique [0002] At present, the energy crisis and environmental pollution are attracting more and more attention. In the global search for new ways to reduce energy loss, my country's policy of vigorously developing new energy vehicles has emerged as the times require, and pure electric vehicles are the main development direction. In the assembly, the driving part is still the most used permanent magnet synchronous motor, which is different from other types of automotive products. In terms of the motor controller that determines whether the motor works well, the current domestic controller Most of them are industrial. Due to complex road conditions and high real-time requirements, automotive-grade motor controllers have higher requirements ...

AI Technical Summary

Problems solved by technology

[0005] To sum up, in the prior art, the automotive-grade motor controller needs special processing when running at high speed, but most of the current domestic use is the look-up table method, which has the ability to respond quickly to road conditions and control effects. Wearing defect

Images