Detection of initial motor rotation in mains-fed induction motor
AssigneeSchneider Electric USA, Inc.
InventorRoy S. COLBY
Life of this patent
Estimating the term…
Abstract
A system and method to detect an onset of motor rotation for an induction motor. The system and method involves monitoring a power supplied to a motor via a sensor, determining a power quantity based on the power monitored by the sensor, detecting an envelope of the power quantity, detecting an onset of rotation of the motor when an amplitude of the envelope has increased, and inhibiting power flow to the motor when the onset of rotation does not occur within a predetermined time period or logging a first time period of the detected onset of rotation of the motor for use in monitoring the condition of the motor. The power quantity can be a current vector magnitude or an instantaneous power corresponding to the supplied power.
Claims16
A system for detecting an onset of motor rotation, the system comprising:
- a sensor to monitor power supplied to a motor;
- a memory;
- and
- a processor configured:
- to determine a power quantity based on the power monitored by the sensor;
- to detect an envelope of the power quantity;
- to detect an onset of rotation of the motor when an amplitude of the envelope has increased;
- and
- to inhibit power flow to the motor when the onset of rotation does not occur within a predetermined time period or log a first time period of the detected onset of rotation of the motor for use in monitoring the condition of the motor.
A method of detecting an onset of motor rotation, the method comprising:
- monitoring power supplied to a motor via a sensor;
- determining a power quantity based on the power monitored by the sensor;
- detecting an envelope of the power quantity;
- detecting an onset of rotation of the motor when an amplitude of the envelope has increased;
- and
- one of inhibiting power flow to the motor when the onset of rotation does not occur within a predetermined time period or logging a first time period of the detected onset of rotation of the motor for use in monitoring the condition of the motor.
A tangible memory medium storing executable code which, when executed by one or more processors, implements a method of detecting an onset of motor rotation, the method comprising:
- monitoring power supplied to a motor via a sensor;
- determining a power quantity based on the power monitored by the sensor;
- detecting an envelope of the power quantity;
- detecting an onset of rotation of the motor when an amplitude of the envelope has increased;
- and
- one of inhibiting power flow to the motor when the onset of rotation does not occur within a predetermined time period or logging a first time period of the detected onset of rotation of the motor for use in monitoring the condition of the motor.
Dependencies are inferred from the claim text.