Position sensorless control algorithm for AC machine
AssigneeGeneral Motors Corporation
InventorsSteven E. Schulz, Nitinkumar R. Patel, James M. Nagashima, Seung Ki Sul, Bon-Ho Bae
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Abstract
A control system for an electric motor having a stator and rotor including an inverter for providing power to the electric motor, a controller for controlling the inverter, a low speed control block to estimate the rotor angular position using stator current components operating in the controller, a high speed control block to estimate the rotor angular position using stator current components and stator flux position operating in the controller, a transition switch in the controller to vary operation between the low speed control block and the high speed control block, and where the inverter is controlled by six step operation.
Claims18
A control system for an electric motor having a stator and rotor comprising:
- an inverter for providing power to the electric motor;
- a controller for controlling said inverter;
- a low speed control block to estimate the rotor angular position using stator current components operating in said controller;
- a high speed control block to estimate the rotor angular position using stator current components and stator flux position operating in said controller;
- a transition switch in said controller to vary operation between said low speed control block and said high speed control block;
- and
- wherein said inverter is controlled by six step operation.
A sensorless method of controlling an electric motor comprising:
- providing a low speed rotor angular position block operating in a controller;
- providing a high speed rotor angular position block operating in said controller;
- providing an initial rotor polarity detection block operating in said controller;
- transitioning between said low speed rotor angular position block and said high speed rotor angular position block to determine the speed of the electric motor;
- and
- controlling the speed of the electric motor with six step operation.
A powertrain for a vehicle comprising:
- an electric motor functionally coupled to a wheel of the vehicle;
- an inverter for providing power to the electric motor;
- a controller for controlling said inverter;
- a low speed control block to estimate the rotor angular position using stator current components operating in said controller;
- a high speed control block to estimate the rotor angular position using stator current components and stator flux position operating in said controller;
- a transition switch in said controller to vary operation between said low speed control block and said second high speed control block;
- and
- wherein said inverter is controlled by six step operation.
Dependencies are inferred from the claim text.