Publication

Reducing the cogging torque in brushless DC motors by using conformal mappings

Yves Perriard, Marcel Jufer, Miroslav Markovic
2004
Journal Articles

Abstract

We present an exact model for determining the cogging torque in a brushless DC (BLDC) motor. It is based on the conformal mapping (CM) method, by which the motor configuration is transformed to a configuration where the magnetic field can be determined. Then, by integrating the field over the stator surface, the cogging torque is determined. By varying some motor parameters, which is easy to do, an optimal configuration with the minimal cogging torque is obtained. We have confirmed the results by the finite-element method (FEM). The model produces results much faster than FEM alone.

Official source

https://infoscience.epfl.ch/entities/publication/160ca678-7c25-4da8-b26d-c493eecbfbcb

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Yves Perriard, Marcel Jufer, Miroslav Markovic
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/160ca678-7c25-4da8-b26d-c493eecbfbcb

About this result

Related concepts (32)

Electric motor

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy.

Brushless DC electric motor

A brushless DC electric motor (BLDC), also known as an electronically commutated motor, is a synchronous motor using a direct current (DC) electric power supply. It uses an electronic controller to switch DC currents to the motor windings producing magnetic fields that effectively rotate in space and which the permanent magnet rotor follows. The controller adjusts the phase and amplitude of the DC current pulses to control the speed and torque of the motor.

AC motor

An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field. The rotor magnetic field may be produced by permanent magnets, reluctance saliency, or DC or AC electrical windings.

Related publications (19)

Reducing the cogging torque in brushless DC motors by using conformal mappings

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