Multi-channel Low-speed Synchronous Motor Position Control System For Research

In order to substitute automatic control for traditional manual operation, the automatic control system which is applied by certain ship is investigated in this thesis. A mechanism of eccentric wheel driven by low-speed synchronous motor here is employed to simulate the real device on the ship. The circuit and software design of eccentric wheel controller is implemented, and so is the principle design of the 12 combination control system.We adopt SPM (smart power module) as the kernel of the eccentric wheel controller circuit, and introduce detection circuit, protection circuit, etc. The software of the eccentric wheel controller can be divided into two sections which include eccentric wheel's motion control section and eccentric wheel's position estimation section. The motion control section controls the operation status of the eccentric wheel, such as positive rotation, negative rotation and stand still, and the position estimation section displays the present position of the eccentric wheel. Position estimation program is based on the position estimation principle which is a novel sensorless eccentric wheel's position estimation method. The method arises from the rotating eccentric wheel's characteristics: Under normal conditions, eccentric wheel makes circular motion at the uniform velocity, meanwhile the phase difference between phase voltage and phase current varies with the position of eccentric wheel. The proposed design is implemented and verified by the experiment, and the result is applicable.Based on single eccentric wheel controller, a 12 combination control system made up of 12 eccentric wheel mechanisms is discussed. This system employs a TMS320LF2407A micro processor to control 12 eccentric wheel mechanisms simultaneously. In order to solve the problem about the shortage of DSP I/O ports, SPI circuit is used to expand some ports and CD4053 chip circuit is applied for DSP capture unit's expansion, and detailed component implementation is discussed. To setup a 12 combination control system, the optimal logic design of chip GAL16V8 is completed so as to decrease the complexity of the system software design.