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DC injection braking is a method of slowing AC electric motors. Direct Current is injected into the winding of the AC motor after the AC voltage is disconnected, providing braking force to the rotor. [ 1 ]
In the DC injection method DC current is injected to the motor so that control of the motor flux is lost during braking. The flux braking method based on DTC enables the motor to shift quickly from braking to motoring power when requested. In flux braking the increased current means increased losses inside the motor. The braking power is ...
A DC motor is an electrical motor that uses direct current (DC) to produce mechanical force. The most common types rely on magnetic forces produced by currents in the coils. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current in part of the motor.
This method contrasts with conventional braking systems, ... (this mainly applies to locomotives where an AC supply is rectified for DC motors).
The use of both braking systems at the same time is called blended braking. Li-ion batteries have also been used to store energy for use in bringing trains to a complete halt. [1] Although blended braking combines both dynamic and air braking, the resulting braking force is designed to be the same as the air brakes on their own provide.
VL dc = D × V volts: V o = V/(1 – D) volts External inductance: Not required: Required for boosting the output voltage Use: For motoring operation, for motor load: For regenerative braking for motor load. Type of chopper: Single quadrant: Single quadrant Quadrant of operation: 1st quadrant: 1st quadrant Applications: Motor speed control
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The fields of EM couplings can be made to operate at almost any DC voltage, and the torque produced by the clutch or brake will be the same, as long as the correct operating voltage and current is used with the correct coupling. If a 90 V clutch, a 48 V clutch and a 24 V clutch, all being powered with their respective voltages and current, all ...
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