发明名称 |
Systems, methods, and assemblies for detecting stoppage of electric motors |
摘要 |
A motor controller for an electric motor having a stator and a rotor. The motor controller includes a power input for receiving AC power from a power source; a control input for receiving a control signal from a control; and circuitry for switching power from the power source to the electric motor in response to the control signal. The circuitry is operable to: apply a driving waveform to the stator to cause rotation of the rotor; remove the driving waveform from the stator to cause the rotor to coast and eventually stop; apply a stop detection waveform to the stator while the rotor is coasting, wherein the stop detection waveform induces a waveform on the rotor which in turn induces a waveform back to the stator while the rotor is rotating; and monitor the stator to detect a characteristic of the waveform induced back to the stator to detect when the rotor has substantially stopped rotating. |
申请公布号 |
US8907600(B2) |
申请公布日期 |
2014.12.09 |
申请号 |
US201213681100 |
申请日期 |
2012.11.19 |
申请人 |
Nidec Motor Corporation |
发明人 |
Sheahan Thomas J. |
分类号 |
H02P3/06;H02P6/24;H02P3/02 |
主分类号 |
H02P3/06 |
代理机构 |
Hovey Williams LLP |
代理人 |
Hovey Williams LLP |
主权项 |
1. A motor controller for an electric motor having a stator and a rotor, the motor controller comprising:
a power input for receiving power from a power source; and circuitry for switching power from the power source to the electric motor, wherein the circuitry is operable to:
apply a driving waveform to the stator to cause rotation of the rotor;remove the driving waveform from the stator to cause the rotor to coast and eventually stop;apply a stop detection waveform to the stator while the rotor is coasting, wherein the stop detection waveform induces a waveform on the rotor which in turn induces a waveform back to the stator while the rotor is rotating; andmonitor the stator to detect a characteristic of the waveform induced back to the stator to detect when the rotor has substantially stopped rotating. |
地址 |
St. Louis MO US |