| 摘要 |
PURPOSE:To enable simplification of a driving circuit by obtaining an electric current to be supplied to driving coils for three phases by Hall elements for two phases and said driving circuit. CONSTITUTION:One of driving coils for three phases 10-12, that is, one end of a driving coil 12 is connected with an apparatus ground. To other two driving coils 10, 11, electric current for two phases obtained by amplification of signals from Hall elements 1, 2 is supplied by current amplifier circuits 7, 8. The electric current supplied to the driving coils 10, 11 flows into the driving coil 12 through a common junction of the driving coils for three phases 10-12 to be synthesized there. In this manner, an electric current for one more phase necessary for the driving coil 12 can be obtained to drive the motor. |
