Other

Jean-Yves Dub&eacute;

Philippe Viarouge

J&eacute;r&ocirc;me Cros

A stator ring for an electric motor, the stator ring comprising plural stator ring sections being molded of insulated ferromagnetic powder. The stator ring sections each have an arcuate shoe having a plurality of teeth projecting radially therefrom. The teeth are adapted for receiving coil windings. The stator ring sections are adapted for being retained end to end by a stator core to form a complete stator ring. The arcuate shoes of the stator ring sections create expansion gaps between opposite ends thereof when the stator core and the stator ring sections are subjected to heat expansion, to prevent damage of the stator ring due to the heat expansion. The stator core is also constituted with improved heat dissipation and adapted to mount an electronic circuit board with some of its components in direct heat conductivity with the core. Heat is dissipated by radiation, convection and ventilation.

Electric motor with modular stator ring and improved heat dissipation

The system includes a permanent magnet three-phase motor and an electronic current controlled inverter by pulse width modulation. The motor has twenty-two poles and twenty-four slots, three phases and a cylindrical outer rotor. This structure minimizes torque ripple and maximizes energy efficiently. All coil windings are wound around the stator teeth. Several winding configurations are proposed and a special one with only one coil per slot. The motor phases are supplied by alternating rectangular current waveforms. A specific inverter control system is described to maximize efficiency and reduce current ripple and electromagnetic interference under motorizing or generating operations. The current control is realized by using the mosfets voltage for the current measurement.

Growing community of inventors

Asbestor, Québec, Canada

Jean-Yves Dubé

Growing community of inventors

Asbestor, Québec, Canada

Jean-Yves Dub&eacute;

Jean-Yves Dubé