CONTROL SYSTEM FOR WINDING POWER SUPPLY CABLE

• US 3,863,741 A
• Filed: 04/15/1974
• Issued: 02/04/1975
• Est. Priority Date: 04/13/1973
• Status: Expired due to Term

• Current Assignee: Toru Aihara, Yoshiji Mitsuishi
• Original Assignee: Toru Aihara, Yoshiji Mitsuishi
• Inventors: Mitsuishi, Yoshiji, Aihara, Toru
• Primary Examiner(s): King, Lloyd L.
• Assistant Examiner(s): Keen, D. W.
• Application Number:
  US05/460,776
• Time in Patent Office: 295 Days
• Field of Search: 191/12.2R,12.2A 318/226 242/75.51 254/15R,166,172,173R
• US Class Current: 191/12.20A
• CPC Class Codes: H02G 11/02 using take-up reel or drum

Abstract

Improved service life for the electrical cable supplying power for electrically driven vehicles can be achieved by employing a torque drive motor on the cable reel assembly which is a multiphase motor which is connected to the power source with a delta-connection when the vehicle is in a reverse mode and a Yconnection when it is in a forward mode, thereby reducing the tension on the cable in the latter mode.

Claims

1. Control system for winding and unwinding a power supply cable for an electric-powered earthmoving or construction machine, comprising a reel assembly for winding the cable, a three-phase induction torque motor mechanically connected to drive said reel assembly, first contact means of connecting the torque motor to a three-phase AC electric source by a delta connection type, said contact means of connecting said torque motor to said three-phase AC electric source by a Y-connection type and a control circuit arranged to be actuated with changeover means for directional control of the machine, for alternately and selectively actuating the first and second contact means whereby said torque motor is connected to the electric source by the Y-connection type when the machine moves forward and by the delta connection type when it moves backward.

2. Control system as set forth in claim 1 wherein the control circuit is provided with a limit switch to be actuated with the operation of the changeover means, a first relay for actuating the first contact means and a second relay to actuate the second contact means whereby when the changeover means is positioned in the reverse position of the machine, said limit switch energizes said first relay which actuates the first contact means and when said changeover means is positioned in the forward position of the machine, said limit switch energizes said second relay and actuates said second contact means.

3. Control system as set forth in claim 2 wherein when the changeover means is positioned in the neutral position of the machine, the limit switch energizes the second relay and actuates the second contact means.