Patent ID: 8319461
Filing Date: 2012-11-27
Classification: H02M,H02P

Abstract:
1. A method for controlling a permanent magnet excited, brushless, electronically commutated, three-phase electric motor ( 2 ) comprising the steps of providing a single-phase main AC voltage (U N ) having a main frequency (f N ) is rectified and supplied to an inverter ( 8 ) via a slender intermediate circuit ( 6 ) containing no or a minimum intermediate circuit reactance as an intermediate circuit voltage (U z ) pulsating at double the main frequency (2f N ) which is supplied for powering and commutating the electric motor ( 2 ), wherein the supply takes place by means of a field-oriented current-space vector regulator, wherein a q-current (i q ) as a torque-forming component of the current-space vector (i) is regulated perpendicularly to the field of the permanent magnet and a d-current (i d ) can be regulated as a field-influencing component of the current-space vector (i) in the direction of the field of the permanent magnet, a dynamic field attenuation, wherein the d-current (i d ) in the negative range is defined with a sinusoidal profile and at double the main frequency (2f N ) and wherein the d-current (i d ) is regulated according to its phase position and its amplitude such that ripple of the q-current (i q ) is minimized.