Sensorless control device and method for permanent magnet synchronous motor of electronic water pump

Abstract

The embodiment of the invention discloses a sensorless control device and method for a permanent magnet synchronous motor of an electronic water pump. The device comprises a current sampling module, a flux linkage observation module, a phase-locked loop module, an SVPWM module, a pre-positioning module, an IF speed open-loop module, and a sensorless speed closed-loop module. The pre-positioning module obtains a direct current component under a synchronous rotating coordinate system through current coordinate transformation, and inputs a difference value into a PI controller for adjustment to obtain a reference voltage signal. According to the IF speed open-loop module, the current is kept unchanged at a pre-positioning current, the current is controlled by a PI controller in a closed-loop mode, and parameters are enhanced. The sensorless speed closed-loop module is used for obtaining current and voltage components under a rotating coordinate system through coordinate transformation, obtaining a rotor angle through arc tangent calculation and estimating the rotating speed of the motor and the position of the rotor in real time. According to the invention, an electronic water pump can be reliably started without a sensor, the low-speed stability and the anti-interference capability are strong, the high-speed dynamic performance is good, the method is not sensitive to motor parameters, and the motor control robustness is improved.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a sensorless control device and method for an electronic water pump permanent magnet synchronous motor. Background technique [0002] There are still most of the mechanical parts in modern cars, the control precision of which is not high, and the energy consumption is relatively high. With the development of electronic control technology, the demand for intelligent and electrified automobile systems continues to grow, and the overall performance of automobiles is becoming more and more perfect. At present, most automobile cooling systems are still passive cooling methods, that is, using mechanical water pumps driven by the engine crankshaft, which have problems such as difficulty in starting at low temperature, poor speed regulation effect, and low efficiency, which affect the performance of the cooling system. At present, electronic water pump motors mainly include ...

AI Technical Summary

Problems solved by technology

However, the sliding mode control function is a discontinuous high-frequency switching control, which is easy to cause system chattering and has poor performance at low speeds.

The Kalman filter method is an optimal estimation method. The basic principle is that the stator current, voltage, and rotor flux are input state variables. By linearizing the nonlinear model of the motor, the motor state equation related to the rotor position is established, and the linear Kalman The recursive calculation of the filter can obtain the estimated value of the actual rotor position information required, and realize the sensorless control of the permanent magnet synchronous motor. However, the disadvantage of this method is that it involves a large number of matrix operations, and the parameter setting is difficult. Poor, rarely used in practical engineering

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