Source Of High-precision Speed

The benchmark rev equipment is designed and used for tacho generator's testing, the characteristic of which is high velocity precision, wide speed range and stepless speed adjustment.This system uses REPMSM ( Rare Earth Permanent Magnet Synchronous Motor ) as executing motor. The core hardware platform of this system is designed on 80C196KC MCU and CPLD device and IPM (Intelligent Power Model). Combining the methods of in-phase variable-frequency adjusting speed with brushless DC control, This system makes full use of characteristic of high static precision and dynamic fast response.In the synchronous model, based on the idea of symmetrical SVPWM pattern generator using CPLD device implementation. Pulse width modulation is used in power converters, this conversion can be carried out using analog circuits or digital circuits, such as DSPs and microprocessors. The more efficient and faster solution is the use of Programable Logic Device. This paper demonstrates how to generate variable PWM waveform based on standard CPLD device, the proposed circuit is incorporated with MCU to provide simple and effective solution for high-performance PWM converters.In the brushless model, the IGBT ( Isolated Gate Bipolar Transistor ) switch state period table is gained by MC33035 which analyzes the signal of position feed-back.