Induction Motor Drives . By controlling the dc current through the. Since the DC motor and a DC generator are virtually the same machine mechanically. DC brake for AC motor. The brake is not connected to shaft actually it is not an electromagnetic Dc brake this unit apply a Dc. DC injection braking - Wikipedia, the free encyclopedia. DC injection brake module. DC motor control circuits This worksheet and all related . To view a copy of this. DC injection braking is a method of slowing AC electric motors. A DC voltage is injected into the winding of the AC motor after the AC voltage is disconnected, providing braking force to the rotor. Large rotors and loads with a high moment of inertia may take a significant amount of time to stop through inherent friction alone. To reduce downtime, or possibly as an emergency safety feature, DC injection braking can be used to quickly stop the rotor. A DC injection brake system can be used as an alternative to a friction brake system. DC injection brakes only require a small module located with the other motor switchgear and/or drivers, mounted in a remote and convenient location, whereas a friction brake must be mounted somewhere on the rotating system. Friction brakes eventually wear out with use and require replacement of braking components. DC brake modules do not have consumable parts and should not require maintenance. Friction brakes also require a method of actuation, requiring either a human operator or system controlled actuator, adding to the complexity of the system.
A DC brake is easily integrated into the motor control circuitry. Operation. This slows and eventually halts the rotor completely. As long as the DC voltage is applied to the windings, the rotor will be held in position and resistant to any attempt to spin it. The higher the voltage that is applied, the stronger the braking force and holding power. See also. Controlling Power Transmission Systems. Cleveland, OH: Penton/IPC. Fundamental types. DC motors. AC SC mechanicalcommutator. AC SC electroniccommutator. AC synchronous (SM)Special magneticmachines. Non- magnetic. Enclosure Type. Components andaccessories. Motor controllers. History, education,recreational use. Experimental, futuristic. Related topics. People. See also. C - Capacitance (F)Q - Charge (C)G, B, Y - Conductance, susceptance, admittance (S).
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