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Method of applying brake to a hoist by electromagnetic means in a permanent magnet motor

  • US 10,501,293 B2
  • Filed: 03/28/2017
  • Issued: 12/10/2019
  • Est. Priority Date: 01/31/2017
  • Status: Active Grant
First Claim
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1. A permanent magnet (PM) motor driven hoist with motor based electromagnetic braking comprising:

  • a direct current (DC) power source;

    a PM motor having stator coils and a PM rotor operably coupled to a cable drum with a cable wrapped thereon; and

    a controller operably connected to the direct current power source and the PM motor, wherein the controller is configured to control the PM motor employing a method to brake the PM motor comprising;

    generating control signals in the controller based on a position of the PM motor,applying a braking command signal to the PM motor to magnetically lock the PM rotor of the PM motor for a selected duration,removing the braking command signals for a second selected duration, andrepeating the generating control signals, applying a braking command signal and removing the braking command signal until the PM motor has stopped.

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