Development of a New Sensorless-Vector-Controlled and Transmissionless Electric Vehicle Using a Permanent-Magnet Synchronous Motor

Abstract

One of the most important technologies for electric vehicles (EVs) will be drive control technology for main motor. It is desired for the drive control technology to have the following characteristics. 1) It does not require a position/speed sensor for controlling motor drive, which has been mounted on rotor shaft. 2) It is a kind of vector controls that can produce torque quickly, efficiently and/or precisely. 3) It has wide driving-range and allows developing EVs with no variable transmission. This paper proposes a total of new drive control technologies for such EVs using a permanent-magnet synchronous motor as a main motor, and verifies its usefulness through development of an actual EV that can drive on public road.