Patent ID: 6831430
Filing Date: 2004-12-14
Classification: H02K,H02P

Abstract:
A method for varying the impedance of a motor having N phases, where N is greater than three, comprising:a) synthesizing a plurality of phases of alternating current output using an inverter system, and connecting each phase electrically to at least one inverter terminal; b) connecting, electrically, each phase of said motor to: (i) a first terminal of said inverter; (ii) a second terminal of said inverter S skipped terminals distant from said first terminal in order of electrical phase angle, where S is the skip number and represents the number of skipped terminals: so that a phase angle difference between the two inverter terminals to which each motor phase is connected is identical for each motor phase; c) varying the phase angle difference between said first terminal and said second terminal; d) receiving a signal indicating a requirement to vary the impedance of the motor, and wherein said step of varying the phase angle difference comprises varying the phase angle difference substantially in accordance with said requirement to vary the impedance of the motor.