| 摘要 |
<p>PURPOSE:To prevent oscillation after an electric motor car stops and to eliminate unnecessary loss of electric power by providing a sensing means which senses the stop of wheels which are not applied with driving force, and opening the power feed switch circuit of an angle control motor with its sense output. CONSTITUTION:A magnetic sensor 21 is fitted to a caster frame 12, and a magnet piece 22 is fitted to a caster 9 to constitute the sensing means 23. When a running cart body 1 detects a permanent magnet 24 at a stop point provided to a guide line 18 by a stop point detection sensor 25, a brake circuit 31 operates and a control circuit 32 also operates to put a regenerative brake, power generating brake, and electromagnetic brake in operation successively; and a driving motor 29 is stopped to stop the main body 1. The rotation of the caster 9 stops by the stopping of the main body 1. The rotation of the caster 9 stops by the stopping of the main body 1. Consequently, the magnet piece 22 rotates any more and the output of the sensor 21 does not contain an AC component any more. Therefore, the output of a frequency-voltage transducer 33 becomes the specific value in a comparing circuit 34 and the power feed switch circuit 35 of a driving circuit 28 is opened to stop feeding electric power to the angle control motor 10.</p> |
