Analysis and simulation of a mono-phase variable-speed actuator driven by a D-modulation inverter

A promising approach regarding variable-speed fractional horse power drives consists in the use of a capacitor-run motor driven by D-modulation PWM inverters. A drive of this kind is not only cheap and reliable but allows also an easy implementation of the required linear relationship between the drive voltage frequency and amplitude. This paper proposes a simulation procedure for such systems that overcomes the problems posed by the complex shape of the resulting drive voltage.