Comparison Chart

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Comparison chart of competing small electrical devices.
Device Theory of Operation
Permanent magnets and alternating polarity of rotor

Advantages
Reliable, hundreds of vendors, inexpensive, non-proprietary design, start-up / shut-down control

Disadvantages
Many parts, many failure modes, suited only for rotary motion unless additional hardware is added (gear-trains), noisy Force decreases dramatically with stroke (Max. at start, drops at end), large & heavy due to permanent magnets, can’t control output design not scaleable Same as DC Motor

Principle Uses
Toys, computers, consumer electronics, appliances, automotive: seats, mirrors Washing machines, automatic outdoor sprinklers, industrial machines, car trunk openers Assembly lines, manufacturing Specialized movements in scientific instruments

DC Motor

Solenoid

Oppositely charged electromagnet plunger repelled by permanent magnet Same as DC motor, but rolled linear Material changes shape in electric field

Reliable, thousands of vendors, nonproprietary design, few moving parts, works well in hostile environment

Linear Motor PiezoElectric (PZT)

Linear output or motion

Large force in small package

Expensive, small displacements only Expensive, slow response for wax to heat, operation dependent on thermal environment, threatening failure modes Use once

Wax Actuator

Wax expands when heated to produce force

Large forces possible, few moving parts

Satellite mechanisms

Pyrotechnic

Ignition of powder

High Force Reliable, long lasting, reusable, fast acting, silent operation, few simple parts, scalable movement, very small & light weight, constant force throughout linear stroke, customizable

Ejection seats, emergency systems

MIGA Motor Company SMA Actuators

Heating of SMA wire leads to change in state of material and release of force

New device*

All of the above

*Displacement MultipliedTM SMA actuators have been tested to over 3,000,000 cycles.

Copyright 2005 © MIGA Motor Company. All rights reserved.

www.migamotors.com

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