Motion Control

Gearmotor

The Model MMP-TM55-12V GP52-308 DC gearmotor from Midwest Motion Products (Watertown, MN) accepts any 12-V DC source including battery power. The unit has a diameter of 2.14" and a length of 7.75", with a keyed output shaft 12 mm in diameter by 25 mm long. Mounting is accomplished with 4 face mount M5 threaded holes, equally spaced on a 40-mm-diameter B.C. Output is rated for 35 Nm continuous torque at 15 RPM, and 70 Nm peak. The unit requires 7.2 ampere at 12 V DC to generate its full load output torque. Optional 24- and 36-V windings are available.

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Dual-Axis Stepper Driver

The dual-axis EZHR17EN stepper motor controller and driver from AllMotion, (San Jose, CA) is designed for off-the-shelf, rapid implementation in miniature applications. Measuring 1.6 × 1.6" and featuring encoder feedback, it provides up to two amps drive current for one axis and up to one amp for the second, with an optional second stepper or bi-directional DC driver daughtercard. The unit microsteps up to 1/256, and is suited for medical, scientific, and optical equipment. It is capable of standalone operation and can be programmed to execute a string of preset commands upon power-up.

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Gearheads

The LP+/LPB+ Value Line series of gear-heads from alpha gear drives (Bartlett, IL) offer a lubrication concept that makes them maintenance-free. The LPB+ offers the option of adding an integrated geared pulley drive system. The belt pulley eliminates the need for a right-angle gearbox, couplings, and/or additional bearings. At full load, the gear reducers achieve more than 95% efficiency; the two-stage reducer restricts torsional backlash to less that 10 arcminutes, while the single-stage version operates at under 8 arcminutes.

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Rotary Encoders

Pepperl+Fuchs (Twinsburg, OH) has introduced the 40-mm-diameter, IP54-protected TVI401 Series incremental rotary encoders capable of providing pulse outputs of up to 1024 ppr. Offering a tangential cable outlet for buckle-free connection, the encoders operate at 4.75 to 30 VDC with short-circuit-proof, push-pull output, or 5 VDC operation with RS-422 functionality. The encoders use Opto-ASIC technology and can accept heavy loads via a loadable metal disk.

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Servo Drives

Parker Hannifin’s Electromechanical Automation Div. (Rohnert Park, CA) offers high-power Compax3 all-digital servo drives, available with current output to 10A and 15A RMS. The drives feature auto-tuning, internal function generator on all units, and support for Stegmann single- and multi-turn absolute encoders. All Compax3 drives ship with the Compax3 ServoManager software package for commissioning the drive. The ServoManager program provides diagnostic screens, graphical tuning utilities, an OS download tool, HTML Help tools, an S-curve acceleration calculator, and a motor configuration wizard to be used with non-Parker motors.

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Servo Controller/Driver

QuickSilver Controls (San Dimas, CA) has added multi-thread capability to its SilverDust servo controllers/drivers for NEMA 17 and 23 frame motors. Users can execute two programs simultaneously in the same controller for motion applications where the servo controller is used as the main logic controller. One thread can be used to execute motion-oriented programs, while the other is dedicated to I/O processing. Either thread can change position or velocity by modifying the respective registers. With both program threads running, execute time is 240 microseconds. The 8-kHz servo loop, 1-MB CANopen, and 230-KB serial channels execute as normal.

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CAN Card

The Model CAN-PCI-02 Control Area Network (CAN) card from Copley Controls Corp. (Canton, MA) provides an interface between the company’s distributed motion control software and its CANopen servo and stepper drives. It facilitates plug-and-play CANopen operation and is PCI compliant. Compatible with 3.3V and 5VDC environments, the card’s onboard microcontroller offloads processing tasks from the host computer. The card employs high-speed ISO 11898 driver circuits for CAN bus bit rates to 1 Mbit/sec, and provides dual isolated channels and PCI 32-bit interface. The card’s two independent CAN ports are isolated for noise immunity.

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