| 摘要 |
A controller 400 for placing an electric motor in a non-operative, or disabled, condition places an inverter 410 in: a first configuration if a rotor of the motor is rotating above, or equal to, a predetermined velocity (e.g. a predetermined angular velocity); and in a second configuration if the rotor is rotating below the predetermined velocity. The first configuration allows coil windings 60 of the motor to be short-circuited and re-directed back to the motor, while the second configuration allows voltage generated by the motor to be connected across a voltage source, e.g. battery, in an open circuit configuration. The predetermined velocity may be equal to, or less than, a velocity that results in the motor generating a back emf that is equal to, or less than, the voltage source. The inverter 410 is switched from the first configuration to the second configuration when the rotor velocity drops from above the predetermined velocity to below the predetermined velocity. The inverter 410 includes a plurality of switches, each switch having a reverse diode, wherein the plurality of switches and associated reverse diodes place the motor in an open circuit configuration by coupling a plurality of coil windings across the voltage source. |
