Motion Control

Brush DC Mini Motors

Portescap (West Chester, PA) introduced the 16DCP Athlonix™ high-power-density brush DC mini motors. Available in a 16-mm diameter, the 16DCP motors feature a coreless design with an optimized self-supporting coil and magnetic circuit. The motors are available in two variations — precious metal commutation and graphite commutation — both featuring an Alnico magnet inside. The motors feature a constant force spring design for carbon brush, and an REE (Restriction of Electro Erosion) coil is an available option. With maximum continuous torque up to 2.63 mNm, the motors are suited for medical and industrial pumps, gas analyzers, security and access, and power tools. They are available with encoders and gearheads of various sizes and ratios.

Posted in: Products, Manufacturing & Prototyping, Motors & Drives
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Modular Drives

Control Techniques, a business of Emerson Industrial Automation USA LLC (Eden Prairie, MN), offers Unidrive M and Powerdrive F300 variable-speed, high-power modular drives. Both are available in frame size 11, providing a flexible method of building compact, high-power solutions. Paralleled together, Unidrive M can control asynchronous and permanent magnet motors in systems up to 2.8 MW (4,200 hp). The frame 11 is a 250-kW (400 hp) module that allows system builders to create high-power solutions with a small number of components. Unidrive M’s Active Front End (AFE) solutions provide torque precision and power quality.

Posted in: Products, Manufacturing & Prototyping, Motors & Drives
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Permanent Magnet Motors

NovaTorque (Fremont, CA) introduced 600 RPM versions of its PremiumPlus+® Electronically Commutated Permanent Magnet (ECPM) motors. The new versions are available from 0.75 HP to 3 HP, and are suited for directly driving larger-diameter fans at low speeds. The motors offer lower current requirements (FLA) than AC induction motor alternatives. A patented geometry allows for the use of readily available ferrite (versus rare earth) magnets. The motors are produced in standard NEMA frame sizes.

Posted in: Products, Manufacturing & Prototyping, Motors & Drives
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Variable Frequency Drive

American Control Electronics (South Beloit, IL) introduced the ACF Series of open chassis microprocessor-based variable frequency drives that offers the simplicity of a DC drive. ACF700 drives are designed for setup without any programming. The drives are equipped with user-adjustable trim pots to set Max/Min Speeds, Slip Comp, Boost, Torque Limit, Accel, and Decel/Injection Braking parameters. The 115V/230V single-phase input can provide single- or three-phase outputs of 115V or 230V for sub-fractional HP motors and gearmotors. An onboard microprocessor allows custom programming for a variety of OEM applications. Other features include 1/60 to 1 HP, carrier frequency of 1.6 or 16 kHz, adjustable base frequency, DC injection braking, and protection against overheating as a result of frequent overload.

Posted in: Products, Manufacturing & Prototyping, Motors & Drives
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Servomotors

Siemens Industry (Elk Grove Village, IL) offers Simotics 1FK7 Generation II servomotors with seven shaft heights, quick-connect power connectors, and 20- and 24-bit field-replaceable encoders. The series offers three inertia versions — standard, high-dynamic for rapid acceleration jobs, and high-inertia for maximum smooth running. The motors are designed for operation without external cooling; heat is dissipated through the motor surface. The encoders are mechanically and thermally decoupled from the motor, making them more resistant to vibration conditions on the machine. The servomotors provide cross-profiling for mounting, Drive-Cliq interface for field commissioning and unit recognition with the Siemens Sinamics S120 drive family, plain shaft or keyway design, and three IP ratings.

Posted in: Products, Manufacturing & Prototyping, Motors & Drives
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Servo Drives

The MR-J4-TM multi-network servo drives from Mitsubishi Electric Automation (Vernon Hills, IL) are available with Ether Net/IP™ and EtherCAT® interfaces. The drives feature dual 100BASE-TX Ethernet ports in line, tree, and star topologies; One-Touch Auto-Tuning; 2.5 kHz speed frequency response for short settling time; high-resolution 4,194,304 pulse/revolution absolute encoders; and Advanced Vibration Suppression Control II for vibration suppression on both the load and the machine base. The drives also come with add-on instructions for EtherNet/IP networks using ControlLogix® or Compact - Logix® controllers.

Posted in: Products, Manufacturing & Prototyping, Motors & Drives
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Advantages of Servo Motor and Direct Drive Technology

For many years, stepper motors have been the most popular type of electric motor designed into instrumentation for a wide variety of reasons. Stepper motors have become increasingly commoditized, and can be sourced easily. In addition, the growing “maker movement” has simultaneously made them more popular and reduced their cost. Unlike servo motors, stepper motors don’t require tuning to optimize their performance. What’s more, scaling and motion commands are typically quick and simple to execute using stepper motors. Servo motors often require a bit more expertise in executing complicated (torque, velocity, or position) loop closures. Finally, micro-stepping allows most modern drive electronics to step or increment a stepper motor to a resolution of 50,800 steps per revolution or higher.

Posted in: Articles, Motion Control, Motors & Drives, Optimization, Energy conservation, Electric drives, Electric motors
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An Inside Look at Electromechanical Power-Off Braking Options

Making the right choice between spring set and permanent magnet brakes can impact safety, durability, maintenance, and performance.

Power-off brakes are designed to hold or stop motion in the absence of power. Adding an electrical current releases the brake, freeing the load for motion. Given the safety ramifications of keeping a system locked in place until it is powered up, motion control system designers tend to specify power-off brakes more often than power-on brakes. There are, however, two different failsafe brake technologies: one uses compression springs to hold its load in place, and the other uses permanent magnets. Each has specific strengths and weaknesses, and knowing the difference can impact safety, durability, cost, and performance.

Posted in: Articles, Motion Control, Electronic brake controls, Springs, Magnetic materials
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Multiphysics CAE of a Shock Absorber

Figure 1. CAE simulation of a shock absorber.

Shock absorbers are important parts of vehicles. The shock absorber is used to observe the vibrations from shock loads due to irregularities of the road surface, and operates without affecting the stability, steering, or handling of the vehicle. Generally, for light vehicles, cylindrical coil springs are used as suspension elements. The application described in this article attempts to analyze performance of a shock absorber with different suspension springs. This analysis includes comparative modeling and analysis of solid height, damping performance, oscillation capabilities of closed coil conical and cylindrical compression springs, and a suggested suitable design for improved performance.

Posted in: Application Briefs, Motion Control, Dampers and shock absorbers, Springs, CAD, CAM, and CAE, Performance tests
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Rotary Valve

RotaVal Ltd. (Wiltshire, UK) introduced a heavy-duty rotary valve for use where solids handled and operating conditions combine to cause abrasive erosion within the valve. It has on-site component replacement. The valves are used in discharging materials such as cement, PFA, granite dust, silica sand, and mineral powders under adverse pressure conditions. Standard valves are manufactured in cast iron, SG iron, Ni-hard, and carbon steel. The replaceable body liner can be hard chromed or ceramic coated. Rotor shaft sealing options include various types of gland packing, mechanical seals, and air or grease purge.

Posted in: Products, Motion Control
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