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US 2012/0256576 A1Published application
Control Unit For An Electric Motor, In Particular For A Fan Motor
AssigneePapst Licensing GmbH & Co. KG
InventorAndras Lelkes
Life of this patent
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Abstract
The invention provides a control unit for at least one electric motor, wherein the control unit performs open-loop or closed-loop control of the motor speed of the electric motor in such a way that in the case of control values in specific ranges which are typical of a fault when the setpoint value is being predefined, such a fault being, for example, a line break, a voltage failure or a short circuit, the control unit drives the motor with a predefined setpoint value which differs from the current control value.
Claims12
1-14. (canceled)
A cooling fan, comprising:
- a housing;
- a brushless DC motor mounted in the housing;
- a fan wheel operatively engaged with a rotor of the brushless DC motor, wherein the fan wheel is adapted to rotate when the brushless DC motor is operated in order to create a flow of cooling air;
- a motor controller mounted in the housing in a fixed relationship with the brushless DC motor, wherein the motor controller is adapted (a) to cause the rotor and the fan wheel to rotate at a nonzero speed if the magnitude of a control signal is in a range of values associated with a fault condition and (b) to stop rotation of the rotor and the fan wheel if the control signal is between a nonzero first threshold value and a second threshold value greater than the first threshold value.
1 more element
Dependencies are inferred from the claim text.