| 摘要 |
PCT No. PCT/JP91/01516 Sec. 371 Date Jul. 2, 1992 Sec. 102(e) Date Jul. 2, 1992 PCT Filed Nov. 5, 1991 PCT Pub. No. WO92/09138 PCT Pub. Date May 29, 1992.A three-phase Y-connection direct current motor, which is not only capable of operating at a high efficiency and at high speeds but also small-sized and inexpensive. A position detection device includes three Hall elements for detecting the rotational position of a rotor of the motor, and supplies first-, second- and third-phase position detection signals each having a width equivalent to an electrical angle of 120 degrees and position detection signals having a phase difference of 60 degrees with respect to the corresponding ones of the first-, second- and third-phase position detection signals to an energization control circuit The energization control circuit successively energizes transistors (10a-10d, 11a-11h) of transistor bridge circuits associated with respective phases of armature coils (4a-4c) to supply a current to the armature coils in forward and reverse directions. When the energization of an armature coil is interrupted, capacitor (16a-16c) connected to a reverse current-preventing diode (17a-17c) is electrified by magnetic energy stored in the armature coil to rapidly reduce the magnetic energy, and when the energization of an armature coil is started, the armature current is rapidly raised by the voltage charged in the capacitor.
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