A method and controller for controlling an electric motor
AssigneeProtean Electric Limited
InventorTimothy John Martin
Life of this patent
Estimating the term…
Abstract
A method for controlling an electric motor, the method comprising receiving a command to place the electric motor in a short circuit mode; varying a limit to an available pulse width modulation depth for controlling current flow in the electric motor to a predetermined value over a predetermined time period or at a predetermined rate of change; wherein upon the pulse width modulation depth limit being varied to the predetermined value placing the electric motor in the short circuit mode
Claims16
A method for controlling an electric motor, the method comprising receiving a command to place the electric motor in a short circuit mode;
- reducing a limit to an available pulse width modulation depth for controlling current flow in the electric motor to a predetermined value over a predetermined time period or at a predetermined rate of change;
- wherein upon the pulse width modulation depth limit reaching the predetermined value the electric motor is placed in the short circuit mode.
(canceled)
A controller an electric motor, the controller comprising means for receiving a command to place the electric motor in a short circuit mode;
- means for reducing a limit to an available pulse width modulation depth for controlling current flow in the electric motor to a predetermined value over a predetermined time period or at a predetermined rate of change;
- and means for placing the electric motor in the short circuit mode upon the pulse width modulation depth limit reaching the predetermined value.
(canceled)
Dependencies are inferred from the claim text.