发明名称 |
Linear induction motor elevator car door drive. |
摘要 |
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> |
申请公布号 |
EP0676527(A1) |
申请公布日期 |
1995.10.11 |
申请号 |
EP19950301143 |
申请日期 |
1995.02.22 |
申请人 |
OTIS ELEVATOR COMPANY |
发明人 |
PERUGGI, RICHARD E.;AHIGIAN, EDWARD E.;MCHUGH, THOMAS M.;JAMINET, JEROME F.;HE, THOMAS;KULAK, RICHARD E.;KOWALCZYK, THOMAS M.;BARRETT, DAVID W. |
分类号 |
B66B13/14;E05F15/60;H02P25/06 |
主分类号 |
B66B13/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|