SPEED REGULATOR FOR A BRUSHLESS DC MOTOR

摘要

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, characterised in that the speed regulator is able to generate a voltage V(phi) as a function of rotor speed of revolution, rotor position (phi), rotor load and motor activation, wherein the speed regulator sets the change in the voltage V(phi) of the motor as a function of the rotor position phi in such a way that the instantaneous torque T(phi), at least in the vicinity of the reversal in polarity of the driving magnetic field, complies with the conditions that the derivative (phi)/∂phi is essentially zero and the second derivative ∂<2>T(phi)/∂phi<2> is an essentially monotonic function.