Control of a fan motor for an improved EMC behavior
AssigneeElektrosil GmbH
InventorsHendrik Niemann, Martin Oppermann
Life of this patent
Estimating the term…
Abstract
A method is provided for electrically driving a motor having a plurality of phase windings such that EMC (electromagnetic compatibility) is improved and the running performance of the motor is simultaneously kept constant. At least one of the phase windings is not supplied with a current pulse during a complete revolution of the rotor, or at least one switchable electrical resistor is switched on, for at least one subsequent commutation phase by means of an electrical switching element, if the detected rotor speed is greater than the specified target speed.
Claims12
A method for electrically driving a motor having a bridge circuit electrically coupling a plurality of phase windings, wherein the motor has a sensor for detecting a rotor speed and/or a rotor position of a rotor of the motor, the method comprising:
- applying, by a microprocessor, current pulses alternately to individual phase windings of the plurality of phase windings by drive electronics of the motor electrically coupled to the microprocessor, the drive electronics include the bridge circuit;
- performing, by the microprocessor, a rough adjustment of the rotor speed when a difference between the determined rotor speed (Tactual) and a specified target speed (Ttarget) exceeds a specified threshold, the rough adjustment of the rotor speed is performed during a complete revolution of the rotor by not supplying a current pulse to no more than half of the phase windings of the plurality of phase windings;
- and
- performing, by the microprocessor, a fine adjustment of the rotor speed after the rough adjustment when the determined rotor speed (Tactual) is larger than the specified target speed (Ttarget) and when the difference between the determined rotor speed (Tactual) and the specified target speed (Ttarget) is smaller than the specified threshold by switching on at least one switchable electrical resistor of the drive electronics for at least one subsequent commutation phase by at least one electronic switching element of the drive electronics.
A system, comprising:
- a motor;
- a drive electronics circuit electrically coupled to the motor, the drive electronics circuit having:
- a bridge circuit;
- a plurality of phase windings electrically coupled to the bridge circuit;
- a sensor for detecting a rotor speed and/or a rotor position of a rotor of the motor electrically coupled to the bridge circuit;
- and
- a microprocessor electrically coupled to the drive electronics circuit and operable to:
- apply current pulses alternately to the plurality of phase windings thereby driving the motor;
- perform a rough adjustment of the rotor speed when a difference between a determined rotor speed (Tactual) and a specified target speed (Ttarget) exceeds a specified rotor speed threshold, the rough adjustment of the rotor speed performed during a complete revolution of the rotor by not supplying a current pulse to no more than half of the phase windings of the plurality of phase windings;
- and
- perform a fine adjustment of the rotor speed after the rough adjustment when the determined rotor speed (Tactual) is larger than the specified target speed (Ttarget) and when the difference between the determined rotor speed (Tactual) and the specified target speed (Ttarget) is smaller than the specified threshold by switching on at least one switchable electrical resistor of the drive electronics for at least one subsequent commutation phase by at least one electronic switching element of the drive electronics.
Dependencies are inferred from the claim text.