Pure electric vehicle driving motor stator resistance real-time on-line compensation method

Abstract

The invention discloses a pure electric vehicle driving motor stator resistance real-time on-line compensation method which comprises the following steps that: (a) first, temperature sensors are respectively arranged in three-phase stator windings in a driving motor, a three-wire system resistance measurement wiring method is adopted, and three wires have the same material, wire diameter and length; (b) the signal output ends of the three-wire system resistance measurement wires are connected with the analog-to-digital (A / D) conversion module of a pure electric vehicle motor controller, and the A / D conversion module acquires the temperature of the stator windings of the driving motor in real time, and marks the resistance of the current stator winding; and (c) the temperature of a rotor is calculated by a first-order difference equation, and a stator magnetic chain is compensated. The pure electric vehicle driving motor stator resistance real-time on-line compensation method has the advantages that: the wiring is simple, the resistance errors of the wires can be eliminated, the resistance of the stator windings can be compensated in real time on line, the stator magnetic chain is corrected in real time, and the control performance of a pure electric vehicle driving motor control system is improved.

Description

technical field [0001] The invention relates to a pure electric vehicle permanent magnet synchronous drive motor, in particular to a real-time online compensation method for the stator resistance of the pure electric vehicle drive motor. Background technique [0002] At present, most pure electric vehicle motor controllers use vector control for the motor. The motor is in the high-speed area, and the system generally operates under the condition of weak magnetic field. Because the stator flux linkage is small, the small stator flux linkage change caused by the stator resistance change will also have a greater impact on the system control performance. At present, most of the schemes for identifying the stator resistance cannot realize the online compensation of the stator resistance, and the algorithm is complicated, which requires a large calculation cost. Therefore, combined with the characteristics of the pure electric vehicle controller, it is very necessary to identify ...

AI Technical Summary

Problems solved by technology

Due to the small stator flux linkage, the small stator flux linkage change caused by the change of stator resistance will also have a greater impact on the system control performance

At present, most of the schemes for identifying the stator resistance cannot realize the online compensation of the stator resistance, and the algorithm is complex, which requires a large calculation cost