Solid state D.C. motor control.

摘要

The system includes a plurality of parallel-­connected power field effect transistors (40-62) ar­ranged for connection in series with the traction motor (12, 14) with a common control circuit (64) connected to the gate electrodes (72-94) of the field effect trans­istors to control the on-off cycle of conduction through the field effect transistors. A plurality of parallel connected power diodes (108, 110, 112) are arranged for reverse connection in parallel with the traction motor to serve as freewheeling diodes. The diodes are physically positioned apart from one another and distributed in position among the field effect transistors and each diode is posi­tioned in a similar manner with a group of associ­ated field effect transistors for ease of transfer of current flow between the diode and the associ­ated field effect transistors.