Motion Control

Torque Limiters

Zero-Max (Plymouth, MN) offers torque limiters in very large models for handling up to 37,000 foot pounds or 50,000 Newton meters of torque. These very large torque limiters are designed to protect drive trains, gearboxes, and generators from excessive peak loads. Features include factory preset torque, maximum bore sizes up to 5-1/2" or 140 mm with or without keyway, operating temperature range from -40 to +80 °C, and no maintenance. Custom torque limiters are available for all applications.

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Flow-Regulating Valve

The Lee Company (Westbrook, CT) offers the High Pressure 500 Flosert miniature flow-regulating valve that is pressure-compensated to provide a constant flow over a range of pressure differentials. The valve is suited for high-pressure hydraulic applications with system pressures up to 5000 psi. Available in forward and reverse regulated flow configurations, the valve is constructed entirely of stainless steel. Regulated flow rates are available from 1.5 to 5.0 GPM.

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Motion Control Systems

Aspen Motion Technologies, a Division of Pentair (Radford, VA), offers motion control solutions. Capabilities range from 0.5" in diameter to 36" in diameter for permanent magnet brushless synchronous motors/generators, with the associated drive electronics, from a few Watts to 25 kilowatts, often with a DSP/ARM core and data interface such as analog, CAN OPEN, Zigbee, RS485, I2C, or other industrial communication interfaces. Systems include precision servomotors with feedback devices, brakes, gearboxes, and integrated intelligent controllers. Other products include forward curve/backward curve/centrifugal blowers, high-efficiency systems (motors and generators), high-performance magnetic couplings, compact liquid pumps, direct drive solutions with integrated drives, and complete OEM products per customer specifications.

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Stepping Motor

Sanyo Denki America (Torrance, CA) offers the F2 two-phase bipolar stepping motor with a frame of 0.55" and holding torque at 0.92 oz-in minimum. It features a step angle of 1.8 degree/ step, and rated current of 0.3A/phase. Single- and double-shaft models are available. Applications include electric grippers, electric cylinders, robots, and other space-limited uses.

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Motor Control IC

Melexis (Nashua, NH) has announced the MLX81205/ 07/10/15 family of integrated circuits (ICs) for sensor-less and sensor-based BLDC motor control for automotive applications. The ICs combine a voltage regulator, LIN-Transceiver, MCU, EEPROM, Flash, RAM, Power FET Pre-Driver, and several dedicated circuit blocks. Each circuit is available in different memory configurations and in different package options. The ICs are 45V load-dump-protected and are single-dieper- package solutions (System-On-Chip).

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Wireless Foot Switch Design Considerations

Key selection factors for OEMs to consider include wireless protocol selection, battery selection, operating-voltage and space constraints, and wireless receiver location. Wireless foot switches for the control of medical devices are gaining acceptance and growing in popularity — prompting OEMs to design medical equipment for use with a wireless foot switch or to accept a wireless foot switch as a pre-sale or post-sale option.

Posted in: Bio-Medical, Briefs, Briefs

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Controlling Devices Using the Ear as an Output Source

This method creates a hands-free way of controlling devices such as medical equipment, wheelchairs, computers, and cell phones.Current methods of device control include joysticks, which involve using one or both hands, external microphones that are cumbersome and pick up ambient noise, and external arrays that are also cumbersome and can restrict a user’s movement. Additionally, the external microphone and array options do not provide a high level of accuracy in certain situations.

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