Method for controlling an electric motor
AssigneeDyson Technology Limited
InventorsLibo ZHENG, Min ZHANG
Life of this patent
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Abstract
A method is described for controlling an electric motor having a rotor. The method is carried out after a shutdown of the motor has been initiated. The method includes starting a timer in a motor controller, performing regenerative braking to recapture kinetic energy from the rotor as electrical energy, and using the recaptured electrical energy from the regenerative braking to power the motor controller. If the timer in the motor controller exceeds a predetermined timer value, a flag is set in memory in the motor controller to indicate that the motor has stopped.
Claims16
1-10. (canceled)
A method for controlling an electric motor, the method being carried out after start up of the motor has been initiated, the method comprising:
- performing a check for whether a flag has been set in memory in a motor controller, the flag being an indication that the motor has stopped;
- and
- if the flag has been set, allowing the motor controller to commence a motor start up routine upon determining that the flag has been set, or
- if the flag has not been set, delaying the motor controller from commencing a motor start up routine for a predetermined delay period.
A regenerative braking method for a permanent magnet electric motor providing a resync signal reflective of an electrical cycle of the motor, the method comprising:
- measuring a resync period of the resync signal;
- in a first part of the electrical cycle, using the spinning magnetic field of the rotor to charge a phase inductance;
- and
- in a second part of the electrical cycle of the motor, using the charged phase inductance to subsequently charge a capacitor.
Dependencies are inferred from the claim text.