| 摘要 |
PURPOSE:To obtain a constant torque having no ripple in a simple configuration by obtaining a signal similar to a crossing magnetic flux waveform of energized phase from the induced voltage of a coil of nonenergized phase, and flowing a drive current inversely proportional to the interlinkage magnetic flux. CONSTITUTION:3-phase coils 1-3 of a motor are respectively switched and driven by switching transistors 4-6. The magnitudes of the drive currents of the coils 1-3 are controlled by series control transistor 9 and an operational amplifier 10 connected to the common connection point of the transistors 4-6. The induced voltages, i.e., the crossing magnetic fluxes of the coils 1-3 are led through switches 12-14. The transistor 9 is controlled that currents flowed to the coils 1-3 on the basis of the outputs are proportional to the reciprocal of the similar waveform similar to the coil interlinkage magnetic flux waveform. |
