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Induction Motor Braking and Speed Control Methods

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Induction Motor Braking Braking Methods ‡ ‡ ‡ Regenerative Braking Plugging or reverse voltage braking Dynamic ( or rheostatic ) braking : a) b) c) d) ac dynamic braking Self-excited braking using capacitor dc dynamic braking zero-sequence braking Regenerative Braking ‡ If an induction motor is forced to run at speeds in excess of the synchronous speed, the load torque exceeds the machine torque and the slip is negative, reversing the rotor induced EMF and rotor current. In this situation th
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  Induction Motor  Braking  Braking Methods Regenerative BrakingPlugging or reverse voltage brakingDynamic ( or rheostatic ) braking : a)ac dynamic brakingb)Self-excited braking using capacitor c)dc dynamic brakingd)zero-sequence braking  Regenerative Braking If an induction motor is forced to run atspeeds inexcess of the synchronous speed, the loadtorque exceeds the machine torque and theslipis negative, reversing the rotor induced EMF androtor current. In this situation the machine willact as a generator with energy being returned tothe supply.If the AC supply voltage to the stator excitation issimply removed, no generation is possiblebecause there can be no induced current in therotor.  Regenerative braking In traction applications, regenerative braking isnot possiblebelow synchronousspeedin amachine fed with afixed frequency supply. If however the motor is fed by a variable frequencyinverter then regenerative braking is possible byreducing the supply frequency so that thesynchronous speed becomes less than themotor speed.AC motors can be microprocessor controlled toa fine degree and can regenerate current downto almost a stop
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