varying the frequency by omitting half waves

Full Title

Arrangements or methods for the control of AC motors characterised by the kind of supply voltage (of two or more motors H02P5/00; of synchronous motors with electronic commutators H02P6/00; of DC motors H02P7/00; of stepping motors H02P8/00) > using variable-frequency supply voltage, e.g. inverter or converter supply voltage > using AC to AC converters without intermediate conversion to DC (H02P27/05 takes precedence) > varying the frequency by omitting half waves