Methods for improving rate of rise of torque in electric machines with stator current biasing
AssigneeTula eTechnology, Inc.
InventorsPaul Carvell, Philippe Farah
Life of this patent
Estimating the term…
Abstract
A method of controlling an electric machine having a separately excitable rotor and stator includes pulsing the electric machine and controlling the electric machine to an OFF state. Pulsing the electric machine includes exiting the rotor with direction current and the stator with a stator biasing current at the same time to generate magnetic flux in the rotor via two separate paths. Pulsing the electric machine may also include terminating the stator basing current when a desired magnetic flux is generated in the rotor. Pulsing the electric machine may include proving a stator flux to the stator such that the electric machine provides a pulse torque.
Claims17
A method of controlling an electric machine having a separately excitable rotor and stator, the method comprising:
- energizing the electric machine comprising:
- exciting the rotor with direct current and the stator with a stator biasing current at the same time to generate magnetic flux in the rotor via two separate paths;
- terminating the stator biasing current when a desired magnetic flux is generated in the rotor;
- and
- providing a stator flux to the stator such that the electric machine provides torque;
- controlling the electric machine to an OFF state by terminating the direct current to the rotor and the stator flux.
A controller for controlling an electric machine having a separately excitable rotor and stator, the controller comprising:
- a memory;
- and
- a processing device, operatively coupled to the memory, to:
- excite the rotor with direct current and the stator with a stator biasing current at the same time to generate magnetic flux in the rotor via two separate paths;
- provide a stator flux to the stator such that the electric machine provides torque;
- terminate the stator biasing current when a desired magnetic flux is generated in the rotor;
- and
- control the electric machine to an OFF state by terminating the direct current to the rotor and the stator flux.
A non-transitory computer-readable medium storing instructions that, when executed by a processing device, cause the processing device to control an electric machine having a separately excitable rotor and stator by:
- exciting the rotor with direct current and the stator with a stator biasing current at the same time to generate magnetic flux in the rotor via two separate paths;
- terminate the stator biasing current when a desired magnetic flux is generated in the rotor;
- providing a stator flux to the stator such that the electric machine provides torque;
- and
- controlling the electric machine to an OFF state by terminating the direct current to the rotor and the stator flux.
Dependencies are inferred from the claim text.