||This thesis mainly used in the development of an electric vehicle on the drive system, and the motor is used as an interior permanent magnet synchronous motor drive, mainly due to its high power density, high efficiency, high torque inertia and a fairly broad speed operating range. Compared to the two electric vehicles currently on the market are using the six-step square wave control wheel stock motor, because the permanent magnet motor with sinusoidal drive, so the torque output of the smoothness of shares than the wheel motors to well, and this feature can also use an internal combustion engine-driven way comparable locomotives, users do not need to adapt to the electric car ride control methods. In order to meet the demand for electric cars high speed and cost considerations, the CVT is not in use to improve the speed of traffic conditions, the interior permanent magnet synchronous motor is required to operate in the field weakening region, to meet high requirements. In this paper, using the MTPA weakening control strategy for the motor to build its weak magnetic table, and then to implement a microcontroller SH7137 make this drive to verify that the full segment can operate stably.|
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