The brushless electric motor (M) is provided with switching means (Q1-Q6) for selectively supplying current to the armature windings (U, V, W) of the motor (M) from a DC-power supply (1) The switching means (Q1-Q6) are controlled by measuring the back-electromotive forces developed in the windings (U,...http://www.google.ca/patents/US6380707?utm_source=gb-gplus-sharePatent US6380707 - Method and device for controlling a brushless electric motor
