Induction motor controller
AssigneeRockwell Automation Technologies, Inc.
InventorsWei Qian, Haihui Lu, Thomas A. Nondahl
Life of this patent
Estimating the term…
Abstract
An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power output on each of the three phase paths, a voltage sensor coupled to two of the phase paths between the solid-state switching device and the power input, a current sensor on one of the phase paths, a processor communicatively coupled to the voltage sensor, the current sensor, and the solid state switching device; and a memory coupled to the processor. The processor may be configured to calculate a motor parameter based on a signal from the voltage sensor and a signal from the current sensor and store the calculated motor parameter in memory.
Claims7
1-7. (canceled)
An induction motor controller, comprising:
- a phase path;
- a power supply voltage sensor coupled to the phase path;
- a silicon controlled rectifier (SCR) in the phase path;
- a motor voltage sensor coupled to the phase path;
- a motor current sensor in the phase path;
- and
- an SCR controller communicatively coupled to the power supply voltage sensor, the SCR, the motor voltage sensor, and the motor current sensor, the SCR controller having a processor and a memory, wherein the processor is configured to trigger the SCR a first predetermined time before a supplied voltage crosses zero volts, receive a motor voltage signal from the motor voltage sensor, receive a motor current signal from the motor current sensor, and calculate parameters of an induction motor based on the motor voltage signal and the motor current signal received after triggering the SCR, and wherein the processor is configured to store the parameters in memory.
13-27. (canceled)
Dependencies are inferred from the claim text.