V/f Control of Permanent Magnet Synchronous Motors suitable for Home Appliances by DClink Peak Current Control Method

摘要

This paper presents a sensorless sinusoidal driving method of permanent magnet synchronous motors ( PMSMs) for fans and pumps by V/f control. The proposed method is a simple, method that controls DC-link peak currents by a single shunt resistor and a peak detector. Due to the damping factor from the square torque load characteristics of fans and pumps, the drives of PMSMs for fans and pumps by V/f control can be stabilized at starting and steady state. In generalpressure losses of the fluid pass of fan and pump systems are nearly constant; therefore, the flow rate and motor torque are determined by revolutions. Accordingly, high efficiency driving is possible by setting the reference currents corresponding to the q-axis currents at target revolutions. Because of the simple and low cost sensorless control, the proposed method is suitable for fan and pump motor driving systems of home appliances.