Design of an LPC1752-based adjustment-free elevator door motor control system.

Aiming at the complicated adjustment, high maintenance cost and safety problems of elevator door motor, an adjustment-free elevator door motor control system was designed, which consists of a hardware platform using a Cortex-M3 processor LPC1752 with a motor-controlled pulse width modulation (PWM) module and a quadrature encoder interface (QEI), a Mitsubishi intelligent power module (IPM) module, a high accuracy rotary encoder and a general three-phase asynchronous electric motor with frequency modulation and a software control system based on an expert database built out of a variety of experiments. An accurate comparison was automatically made between the parameter values of position, speed and current and the expert database to help the incremental PID tuning, thus selflearning of door width and self-adjustment of running status can be realized. The results indicate that the system can be powered to bring the elevator door into quick operation and smooth running without presetting corresponding parameter values. [ABSTRACT FROM AUTHOR]