Ebm Werke Gmbh & Co.

Ebm Werke Gmbh & Co. Kb

Andr&aacute;s Lelkes

Jens Krotsch

The invention relates to a mains-commutated, synchronous AC motor ( ) with permanent-magnet excitation, which is configured as an external-rotor motor with a permanent-magnet external rotor ( ) which rotates around an inner stator. In this case, an electronic starting apparatus ( ) is provided which actuates the stator ( ) in order to start the external rotor ( ) in such a manner that the external rotor ( ) is accelerated in a controlled manner to its synchronous rotation speed, and then continues to run in the mains-commutated synchronous mode.

Synchronous AC motor

The present invention relates to a system for controlling the rotation speed of AC motors, in particular single phase motors. In this case, a controllable electronic switching device is connected upstream of the motor and is actuated by a control unit such that a sinusoidal input AC voltage is used to produce a motor AC voltage which can be varied in order to change the rotation speed. The control unit is designed in such a manner that the fundamental frequency and/or the amplitude of the motor AC voltage can be varied by phase gating.

Growing community of inventors

Künzelsau, Germany

András Lelkes

Growing community of inventors

Künzelsau, Germany

Andr&aacute;s Lelkes

András Lelkes