Abstract
Permanent magnet traction motor has the advantages of high efficiency, high power density, high torque density and quick dynamic response, which has been widely used in the traction field of electric vehicle. The high-performance control of permanent magnet traction motor depends on accurate rotor position information, which is usually obtained by using mechanical position sensors such as hall sensor, encoder and rotary transformer. However, the traditional mechanical sensor has the disadvantages of high cost, large volume and poor anti-interference ability, which limits the application of permanent magnet motor. The sensorless control technology is an effective way to solve the above-mentioned problem. Firstly, the sensorless control techniques of permanent magnet motor are classified. The sensorless control techniques of permanent magnet motor for rotor initial position, zero-low speed range, medium-high speed range and full speed range are deeply described and compared. Finally, the development trend of sensorless control technology of permanent magnet traction motor is prospected.
Highlights
At present, energy and environment are two major themes of social development
The combined method of multiple position estimation methods proves effective in improving the accuracy and reliability of detection
A three-phase triangular wave carrier SPWM modulation mode was adopted to provide a continuous carrier frequency component signal, and the rotor position was calculated by analyzing the carrier component in high frequency (HF) current
Summary
Energy and environment are two major themes of social development. A series of social problems such as air pollution, global warming, the shortage of fossil fuel resources and combustion problems related to pollution-free and clean environments have attracted a great of attention for the construction of pollution-free and efficient traction systems in electric vehicles (EV) [1,2,3,4,5,6]. With the development and application of permanent magnet materials, permanent magnet synchronous motor (PMSM) and brushless DC motor (BLDCM) have drawn increasing attention for their high-power density, large torque inertia ratio and fast dynamic response speed, which demonstrates great potential in various areas, especially in the field of advanced manufacturing transmission systems and large ship electric propulsion [9]. The sensorless control system is capable of obtaining the information about the rotor position by analyzing the voltage and current of the motor port in real time. The paper completely presents the advantages and disadvantages of rotor position estimation techniques, which provide effective guidance for researchers who are working in this field.
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