Variable speed AC motor drives

Variable speed AC motor drives


Beaver drives convert the AC input into a variable frequency, variable voltage system, maintaining a constant V to F ratio for constant torque and varying the speed of the AC motor steplessly. The equipment is low cost, conservatively designed with generous safety margins and de-rating, thus making it highly reliable and maintenance free. Many industrial applications require variable speed drives. In the past, these systems used DC motors or an AC motor with some type of mechanical speed control. These choices result in a high cost, high maintenance and an energy inefficient system. The AC motor is the ideal prime mover because it is inexpensive, maintenance free, readily available and coupled with our inverter it transforms into a variable speed, constant torque machine. Features: These include soft start, reduction of high starting currents, smooth voltage and current build-up (ensuring minimal stress on the motor), controlled acceleration and deceleration rates, voltage boost for high starting torque; synchronizing, dynamic braking and electronic reversing are optional extras. With the above control features and the inherent robustness of 3 phase AC motors, the equipment is ideally suited even for use in hostile atmosphere and hazardous locations. Protections: supply voltage high/low; overload; single phasing; ultra fast semiconductor fuse in voltage bus. Applications: plastics, winding, paper, extruders, printing, textile, stirring, packaging, conveyors and bottling plants. Options include process control-speed variation for 4-20 mA input signal.

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