System and method for stall detection of a motor
First Claim
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1. A motor controller system comprising:
- solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor;
current sensors for sensing motor current;
a voltage sensor for sensing voltage; and
a control circuit for controlling operation of the solid state switches, the control circuit limiting switch current during a start mode and detecting a stall condition responsive to sensed voltage and selectively boosting motor current during the start mode if a stall condition is detected.
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Abstract
A motor starter system comprises solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor. A voltage sensor senses AC line voltage and the motor terminal voltage. Current sensors sense motor current. A control circuit controls operation of the solid state switches. The control circuit limits switch current during a start mode and detects a stall condition responsive to sensed AC line voltage and motor terminal voltage and selectively boosts motor current during the start mode if a stall condition is detected.
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Citations
24 Claims
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1. A motor controller system comprising:
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solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor;
current sensors for sensing motor current;
a voltage sensor for sensing voltage; and
a control circuit for controlling operation of the solid state switches, the control circuit limiting switch current during a start mode and detecting a stall condition responsive to sensed voltage and selectively boosting motor current during the start mode if a stall condition is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A motor starter system comprising:
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solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor;
a voltage sensor for sensing AC line voltage and motor terminal voltage;
current sensors for sensing motor current; and
a control circuit for controlling operation of the solid state switches, the control circuit limiting switch current during a start mode and detecting a stall condition responsive to sensed AC line voltage and motor terminal voltage and selectively boosting motor current during the start mode if a stall condition is detected. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A motor starter system comprising:
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solid state switch means for connection between an AC line and motor terminals for controlling application of AC power to the motor;
voltage sensing means for sensing motor winding voltage;
current sensing means for sensing motor current; and
start control means operatively connected to the voltage sensing means and the current sensing means for controlling operation of the solid state switch means during a start mode, the start control means limiting switch current during the start mode and detecting a stall condition responsive to sensed motor winding voltage and selectively boosting motor current during the start mode if a stall condition is detected. - View Dependent Claims (16, 17, 18, 19)
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20. A method of detecting a stall condition during motor starting comprising:
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providing solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor;
sensing motor voltage;
sensing motor current;
controlling operation of the solid state switches during a start mode to limit switch current during the start mode;
detecting a stall condition responsive to sensed motor voltage; and
boosting motor current during the start mode if a stall condition is detected. - View Dependent Claims (21, 22, 23, 24)
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Specification