Patent ID: 7400107

Claim:
Surgical machine comprising: a battery driven electric motor comprising a rotor and at least two motor windings, a battery for driving the electric motor, and a motor controller for at least one of controlling and regulating the electric motor, wherein: an entire rotational speed range of the surgical machine is divided into at least one lower rotational speed range for low rotational speeds and at least one upper rotational speed range for higher rotational speeds than the speeds in the at least one lower rotational speed range, the motor controller is adapted so that a first method (A) for said at least one of controlling and regulating the electric motor is performable in the at least one lower rotational speed range, and a second method (B) for said at least one of controlling and regulating the electric motor is performable in the at least one upper rotational speed range, and the first method (A) comprises a space vector pulse width modulation (SVPWM) method in which all motor windings are able to be simultaneously supplied with electric current.