EMERGENCY BRAKING FOR A DRIVE SYSTEM

• Main Authors: KRISHNAMURTHY, Shashank, CHEVVA, Konda Reddy, NAGARAJAN, Prasanna
• Format: Patent
• Language: English; French; German
• Published: 03.04.2019
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; ELEVATORS; ESCALATORS OR MOVING WALKWAYS; GENERATION; HAULING; HOISTING; LIFTING; PERFORMING OPERATIONS; TRANSPORTING

A system includes a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, an inverter operatively connected to a motor and the DC bus, and a controller. The converter includes a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus. The inverter includes a second plurality of switching devices in selective communication with each phase of the motor and the DC bus. The controller is operable to command dropping of a brake through a passive delay circuit responsive to an emergency stop condition for a load driven by the motor and reduce a voltage on the DC bus by dropping at least one phase of the AC power source and/or using a dynamic braking resistor prior to the brake physically dropping.