发明名称 |
Sistema acionador de porta para carro de elevador com motor por indução linear |
摘要 |
<p>An elevator car door 17 is moved by a variable voltage, variable frequency linear induction motor which is driven open current loop to achieve a desired velocity profile indicated by an incremental linear encoder 28, with washed out proportional and integral gain. A magnetizing current insufficient to overcome the weight of the door is added in quadrature with the linear force current, and frequency is determined open loop in a predetermined fashion. Pulse width modulation voltage control signals are utilized to apply fixed voltages of correct polarity through a low pass three phase filter to the windings of the motor for correct intervals of time so as to synthesize desired sinusoidal winding currents. A boost of current is provided following each zero crossing of the sinusoidal winding currents to overcome lags therein. A ramp down of voltage avoids dropping the door at the end of door opening and door closing. <IMAGE></p> |
申请公布号 |
BR9500357(A) |
申请公布日期 |
1995.11.07 |
申请号 |
BR19959500357 |
申请日期 |
1995.01.27 |
申请人 |
OTIS ELEVATOR COMPANY |
发明人 |
RICHARD E PERUGGI;EDWARD E AHIGIAN;THOMAS HE;RICHARD E KULAK;THOMAS M MCHUGH;JEROME F JAMINET;THOMAS M KOWALCZYK;DAVID W BARRETT |
分类号 |
B66B13/14;E05F15/60;H02P25/06;(IPC1-7):H02K41/02 |
主分类号 |
B66B13/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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