Motion Control

Brushless DC Motor

BEI Kimco Magnetics (Vista, CA) introduced the DII15-60-200A High Pressure High Temperature (HPHT) brushless DC (BLDC) motor developed specifically to withstand harsh conditions found in the oil exploration Industry. The robust design also makes it suitable for other applications found in severe environments. The 1.5" diameter motor provides a solution for severe down-hole applications such as mud pulser valves, caliper deployment, and sensor positioning. The motor operates under continuous duty in temperatures up to 205 ºC and pressures up to 30,000 psi.

Posted in: Products, Manufacturing & Prototyping, Motion Control

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Servo Motor Brakes

Nexen Group (Vadnais Heights, MN) offers Eclipse Servo Motor Brakes that consume no energy when the brake is disengaged. It is springengaged/ air-released (no electric coil) to keep the brake cool until it is needed. The brakes mount to the shaft end of servomotors up to 20 horsepower, including NEMA 23, 34, and 42 frame sizes. The brake’s square-shaped housing allows flexibility to make the mounting features match the motor dimensions. The brake’s output end duplicates the motor mounting features. The input end bore accepts the motor shaft and is fixed inside the brake with a split-hub/shaft collar arrangement.

Posted in: Products, Manufacturing & Prototyping, Motion Control

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AC Drive

Vacon (Milwaukee, WI) introduced the NXC drive, an enclosed, variable-speed AC drive for high-power applications. It is available in NEMA 1 and NEMA 12 variations for applications in pumps and fans, extruders, main propulsion and bow thrusters, conveyers and crushers, feeders and mixes, winches, compressors, test benches, static power supply, and industrial elevators. It is available with a standard diode front end, or with an active front end when there are requirements for low harmonic, and/or the capability of regenerating 100% of its power back to the incoming line.

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Rotary Assembly Unit

The SCHUNK SRU-mini- Speed rotary unit from SCHUNK (Morrisville, NC) is available in two model sizes and provides swivel times from 0.27s. If lightweight parts are handled with the unit, more than 4,000 cycles per hour can be achieved. Model size 10 achieves swivel times of 0.27s, and up to 3,600 cycles per hour is possible. As an alternative to higher speeds and number of cycles, higher load capacities can be implemented with an unchanged installation space. As part of a patented damping design, elastomer has been combined with an oil-damped shock absorber.

Posted in: Products, Manufacturing & Prototyping, Motion Control

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Choosing the Right Drive Technology

Coming up with the right drive technology for an application often depends on the options available. Here are five of the most common drive configurations being used today, along with their benefits and drawbacks. Although there are a number of variations of drive technologies for motion applications, there are a few that are used for the majority of systems being built today. These most common drives do take a bit of understanding before applying.

Posted in: Articles, Motion Control

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Reasons for Turning to Slotless DC Motor Technology

When first introduced, brushless DC motors, despite their many advantages, were cast as a costly alternative to brush-commutated motors, and were typically only specified for low-power applications where long life was the primary desired requirement. Without the mechanical brush-commutator mechanism that would wear and eventually result in motor failure, brushless motors could be relied upon to deliver performance over time. As for other advantages, conventional wisdom held that brushless motors provide high speed and fast acceleration, generate less audible noise and electromagnetic interference, and require low maintenance. Brush-commutated motors, on the other hand, would afford smooth operation and greater economy.

Posted in: Articles, Motion Control

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Motion Solutions for Electric Expansion Valves

Expansion valves are flow-restricting devices present in any refrigeration system. The valve needle remains open during steady state of operation. The size of the opening, or position of the needle, is related to the pressure and temperature of the evaporator. When set and controlled properly, an expansion valve will keep the evaporator active throughout its operation.

Posted in: Application Briefs, Motion Control

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