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Linear induction motor transport system

  • US 4,704,568 A
  • Filed: 04/14/1986
  • Issued: 11/03/1987
  • Est. Priority Date: 04/14/1986
  • Status: Expired due to Term
First Claim
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1. A transport mechanism for transporting articles formed of a magnetic material along a path of travel comprising:

  • a linear induction motor stator fixedly mounted along the desired path of travel, means for energizing said stator with an alternating multiphase current to produce a moving magnetic field along the path of travel, a control connected to regulate the operation of said induction motor, means connected to furnish said control with command signals representing the desired movement of the articles being transported, means in said control for regulating the frequency of the alternating current supplied to said induction motor for controlling the velocity of the articles along the path of travel in accordance with said command signals, means in said control for regulating the amplitude of the alternating current supplied to said induction motor for varying the magnetic force attracting the articles to the induction motor in accordance with said command signals, at least one line scan camera disposed along the path of travel in position to scan the articles as they are being moved by said induction motor, and means connecting said line scan camera to transmit position feedback signals and velocity feedback signals to said control for tracking the instant position and the rate of travel of the article that is within the view of said camera.

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