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The rotor position sensor is required to control Permanent Magnet Synchronous Motor (PMSM). However, the rotor position sensor, for example, Resolvers or Pulse Generator (PG) have some disadvantages which are an increase of total volume of the motor, fault of power supply lines and signal lines of these sensors, and maintenance. To overcome these difficulties, sensorless control methods have been...
This paper proposes a method to decrease the surge voltage for indirect matrix converter (IMC) by implementing a control method which combines the zero current (ZCS) and the zero voltage switching (ZVS). In the high power applications, the wiring in the DC link parts of the converter contains of a large parasitic inductance. Then a large surge voltage is appearing as a problem at the inverter stage...
This paper proposes to apply an AC/AC direct converter topology for servo systems. In the conventional AC/AC converter which consists of a PWM rectifier and a PWM inverter, the p-n junction temperature becomes high at the low output frequency or the servo-lock operation because the output current concentrates at the specific switching devices in the inverter. On the other hands, the AC/AC direct converter...
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