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Dynamic braking in controlled current motor drive systems

  • US 4,039,914 A
  • Filed: 11/25/1975
  • Issued: 08/02/1977
  • Est. Priority Date: 11/25/1975
  • Status: Expired due to Term
First Claim
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1. A motor control circuit for a controlled current motor drive system comprisinga current source power converter comprising combined full wave controlled rectifier and chopper means and also controlled current inverter means coupled in cascade with a direct-current reactor therebetween,said combined controlled rectifier and chopper means having a pair of rectifier output terminals directly between which is connected in series a braking resistor and dynamic braking switch, andcontrol means for operating said current source power converter to produce variable amplitude and frequency rectangular wave output current to be supplied to a motor winding,said control means under dynamic braking mode conditions further being operative to close said braking switch and operate said combined controlled rectifier and chopper means as a chopper circuit to generate variable width voltage pulses between said rectifier output terminals and across said braking resistor and thus control the direct current magnitude fed to said controlled current inverter means during dynamic braking.

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