Eddy Ying Yin Ho

FPGA realization of a high-performance servo controller for PMSM

This paper proposes a fully digitized hardware design scheme of a vector-controlled servo controller, which is verified and implemented on one-chip field programmable gate arrays (FPGA), for high-performance servo drives of the permanent magnet synchronous motor (PMSM). This scheme integrates the vector control strategy, the M/T speed measurement algorithm, the PI regulating technique and the SVPWM principle as well as the EDA design methodology, and it will be a good substitute for traditional PMSM drives practice. The realized control IC also contains a standard host communication interface, which enables the on-line configuration for all kinds of control parameters. The actual sample frequencies of the torque loop and the speed loop are limited by the selected FPGA; with respect to the Altera FPGA prototype mentioned in this paper, the two loops can respectively obtain a sample frequency of 40kHz and 20kHz as well as a bandwidth of 5 kHz and 400 Hz. Experimental results indicate that the controller can provide a controllable speed range from 0.2 RPM to 10,000 RPM with satisfactory dynamic and static performances.

Design of a universal space vector PWM controller based on FPGA

This paper presents a new design scheme of space vector PWM integrated circuit, including linear and overmodulation ranges. The proposed scheme is implemented and verified on a single Xilinx FPGA. Experimental results show that this controller can present an excellent drive performance and its switching frequency, which can be set to 40 kHz, is adjustable as well as its dead time. The SVPWM IC has been used in closed vector control of AC servo drive system.

Fan Drive Starting into Naturally Rotating Load by Sinusoidal Sensorless Permanent Magnet Motor Control

A permanent magnet (PM) motor is a primary motor of choice for small fan motor drive applications. A traditional fan drive based on a permanent magnet motor uses position feedback sensors such as Hall effect sensors. Recently PM motor drive with sinusoidal current and no position sensor has been demanded for many applications including air conditioner outdoor unit fan control. Some fan and pump applications require that the drive has to start into naturally forward rotating load without stopping the load first. In case of the drive without the position sensor, the task of transition without regeneration capability is more elaborate due to the fact that speed reversal is required without position sensing. This paper describes a new algorithm for starting a PM motor drive into the forward and reverse naturally rotating load, where drive system does not have a regeneration capability and has only one current feedback sensor installed in the DC bus link. The algorithm is implemented on a chip belonging to a new motion controller family, which has been recently introduced by International Rectifier. The chip features a hardware computation engine, called motion control engine (MCE), for sinusoidal sensorless PM motor control. Experimental results are included