Patent ID: 7336045

Claim:
Speed regulator for a brushless DC motor, wherein the DC motor comprises a stator, a rotor and an electromagnet wherein the electromagnet is in the vicinity of the stator, the rotor produces a permanent magnetic field and the electromagnet is activated to generate an alternating magnetic field; furthermore comprising a power supply and a regulating element, the regulating element being connected to the power supply to regulate the power feed to the electromagnet, so that, during use, a torque generated by the DC motor is regulated, wherein the speed regulator is able to generate a voltage (V(φ)) as a function of rotor speed of revolution, rotor position (φ), rotor load and motor activation, wherein the speed regulator sets the change in the voltage V((φ)) of the motor as a function of the rotor position cp in such a way that the instantaneous torque T((φ)), at least in the vicinity of the reversal in polarity of the driving magnetic field, complies with the conditions that the derivative σT(φ)/σφ is essentially zero and the second derivative σT 2 ((φ))/σφ 2 is an essentially monotonic function.