Device for rotational speed-dependent braking torque control for electrical machines excited by permanent magnets
AssigneeKNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
InventorSebastian Schaller
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Abstract
A device for speed-dependent braking torque control for electrical machines excited by permanent magnets includes a switching device deliberately short-circuits the electrical machine. The switching device is controlled as a function of an induced voltage generated by the electrical machine. If the induced voltage falls below a defined value, the switching device reverses the short-circuited state of the electrical machine to cause the braking torque to reduce to zero and the speed to increase again. The speed can thus be controlled within a range by alternately opening and closing the switching device.
Claims12
A device for rotational speed-dependent braking torque control for electrical machines excited by permanent magnets, comprising:
- a switching device which is arranged and configured in a conductive state to short-circuit an electrical machine, wherein
- the switching device is controlled as a function of an induced voltage generated by the electrical machine,
- when a first threshold value of a smoothed and/or a delayed output voltage is exceeded, the switching device short-circuits the electrical machine, and
- when a second threshold value of the delayed and/or smoothed output voltage, which is lower than the first threshold voltage, is undershot, the switching device cancels the short-circuited state of the electrical machine.
Dependencies are inferred from the claim text.