| 摘要 |
A controller for a motor for raising and lowering a lift car in a lift well is disclosed which comprises transistor bridge circuits (10) for providing power to said motor (m), a first processor having a multiplexer (54) for passing one of a plurality of signals containing data relating to the state of said transistor bridge circuits (10) to an analogue to digital converter (38) for converting analogue signals to digital signals and providing said digital signals to a main processor (70), a polar conversion circuit (78) for receiving said signals from said transistor bridge circuits (10) and for converting the signals into signals having a magnitude and a phase component, an overcurrent sensor (85) for sensing whether the current supplied by the transistor bridge circuits (10) is too high, said overcurrent and sensor circuit being coupled to a pulse modulator circuit (87) for controlling the pulse width of the signal applied to the transistors in said transistor bridge circuits, and a second processing circuit comprises a multiplexer arrangement (100) for receiving data relating to the status of said motor or the power supplied by said transistor bridge circuits (10) and for converting streams of parallel data signals into a serial stream of data signal and then reconstructing the original parallel data signals for application to the main processor (70).
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