DC drives regenerate energy

24 June 2013

With its recently extended PLX range, Sprint Electric believes it is able to offer the latest in regenerative three phase digital DC drive technology.

The company’s DC drives are able to regenerate energy back to the mains supply under braking without the need for, complex intermediate storage, resistive dumping or additional power bridges. The company says the PLX DC drives are compact, powerful, flexible and easy to program, and are available in current ratings between 12 and 2250 Amps at supply voltages up to 690 VAC.

A four-quadrant DC drive uses two thyristor bridges to enable it to motor and brake in both directions of rotation. This allows it to reverse the torque to slow the load gently or almost instantaneously, regenerating energy at the same time.

Unlike an AC drive, it is able to generate full torque at zero speed, enabling the load to be safely held stationary without the need for mechanical brakes, a useful feature for winders and hoists. This ability means DC is also suited to use in applications such as mixers, extruders and rollers that require high starting torques and accurate control at low or zero speed, as well as for paper machines, wire drawing and machining.

Sprint Electric offers a wide range of DC motor control, with over 150 models covering both one-phase and three-phase, regenerative and non-regenerative DC motor applications, together with field controllers, digital slip ring motor controllers and thyristor stack controllers.

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