(under subclass 807) Subject matter wherein the voltage supplied to the primary member is a repetitious sinusoidal waveform and the means to regulate the frequency of the voltage supplied to the primary member includes means to regulate the phase angle of the waveform at which the remainder of the waveform of each cycle is applied to the primary member.
(1) Note. Phase angle is the angle in electrical degrees of the waveform between the beginning of the waveform at 0 deg. and the end of the waveform at 360 deg. at which the waveform is applied to the motor winding.
(2) Note. Regulation includes the control of the phase angle at a constant angle or a variable angle.
