System and method for stall detection of a motor
AssigneeSiemens Energy & Automation, Inc.
InventorsScott Mayhew, Scott Wakefield, Daniel Zuzuly
Life of this patent
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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.
Claims24
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.
A motor starter system comprising:
- 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.
A motor starter system comprising:
- 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.
A method of detecting a stall condition during motor starting comprising:
- 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.
Dependencies are inferred from the claim text.