A controller for electrical machine having compliant connection between output and load, particularly a connection between the output of an electric machine and a wheel of an electric vehicle, includes a control system 300 for ensuring that the speed of a rotor of the electric machine 200 does not remain below a threshold value for long enough for overheating of the inductor output stages to occur during acceleration from rest. The control system comprises a controller 304 having a processor 340p, an input 304i and an output 304o. In a first aspect the torque output of the electrical machine is fluctuated depending on whether a torque requirement is above a first threshold and a speed of the rotor is below a second threshold. In a second aspect the torque output of the electrical machine is increased according to a first or second function in dependence on determined values of driver torque demand and a required balance torque. The invention is suitable for allowing electric vehicles to move away from rest on steep gradients or in other situations in which resistance to forward motion is high.
Apparatus and method for controlling an electric machine
2019-05-08
Patent
Elektronische Ressource
Englisch
IPC: | H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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