| 摘要 |
PCT No. PCT/JP87/01019 Sec. 371 Date Oct. 25, 1988 Sec. 102(e) Date Oct. 25, 1988 PCT Filed Dec. 23, 1987 PCT Pub. No. WO88/05225 PCT Pub. Date Jul. 14, 1988.The present invention relates to a motor control apparatus having a discharge circuit 7 for reducing a voltage which is regenerated from motor 5 to the driving circuit 4 in the braking of an AC servomotor or the like, a protection circuit 8 for protecting the discharge circuit 7, and a voltage-drop detection circuit 20 for making the driving circuit stop after an activation of the protection circuit 8. The motor control apparatus contains a detection circuit 16, which detects a voltage of the smoothing capacitor 3 which is connected to the input terminal of the driving circuit 4 via the protection circuit 8 which is connected in series to the discharge circuit 7, and a voltage-drop detection circuit 20 which stops the driving circuit 4 after activation of the protection circuit 8.
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