Patent ID: 6307766
Filing Date: 2001-10-23
Classification: H02J,H02M

Abstract:
A contactless power supply device having a stationary unit and a movable unit that moves linearly in relation to the stationary unit, comprising:a primary conductor disposed on the stationary unit and comprising:(a) a power supply comprising an amplifier for supplying high frequency alternating current;(b) a plurality of wires extending from the power supply along the stationary unit for carrying said current;(c) three switches arranged on said wires in parallel with each other, each switch alternating closing with said other switches to create a three phase alternating current;(d) a first controller connected to said power supply for controlling the operation of the power supply;a secondary conductor disposed on the movable unit and arranged for movement coaxially with said wires, said secondary conductor comprising:(a) a toroidal core surrounding said wires;(b) a three phase motor connected to said core and powered via induction from said power supply to slide the movable unit relative to the stationary unit;(c) a second controller connected to said motor for controlling the operation of said motor;(d) three switches connected in parallel between said motor and said second controller;(e) a Hall sensor arranged on said secondary conductor for sending signals to communicate with said first and second controllers; anda device for keeping the primary conductor and secondary conductor synchronous;wherein said switches serially open and close to transfer alternating current in three phases from said amplifier to said motor.