| Abstract |
It still exists many practical applications of induction motors whose performance requirements
are limited to soft startup and gross speed adjustability with acceptable torque profile, while a
low drive cost constitutes a key issue. In such cases, conventional solutions are still employed
since advanced inverter drives result usually not attractive for such purposes, due to a too high
cost / actual benefits ratio. This paper proposes the application of simple structural harmonic
elimination methods as low-complexity modulation techniques for low-end, low-cost inverter
drives for induction motors employing the scalar V/f regulation strategy. The employ of a very
simple control system, a low switching frequency inverter and a standard single-winding motor
should in fact permit to offer such drives with a limited overcost with respect to conventional
solutions, which could be accepted considering the achievable adjustability improvements.
Design considerations and simulation results are reported. |
