User:Jstapko/DoorAccess/motor options

Motor Options

 * 1) Miniature Mabuchi style motor with brass gear
 * Advantages:
 * can probably be driven directly by the arduino motor shield, no amplifier needed
 * should be fairly easy to attach a pulley to its shaft
 * Disadvantages:
 * may not have enough torque


 * 2) Same style motor as (1), but a bit bigger
 * Advantages:
 * should have more torque than (1), but still be capable of being driven by the arduino/motor shield
 * might be easier to mount, it has a mounting bracket already attached
 * Disadvantages:
 * shaft is smaller, it might be harder to mount a pulley on it
 * the fan blades currently on it may need to be pressed off, a potential mechanical challenge
 * it may still not have enough torque


 * 3) 110 Volt DC gear motor pulled from paper tape reader:
 * Advantages:
 * it WILL have enough torque
 * it is mechanically well suited to mounting, it has mounting holes drilled and tapped in its base
 * Disadvantages:
 * it would have to have a high voltage, high power driver amplifier capable of handling a high inductance load and a suitable power supply for the amp.
 * it has an electrically powered field, making wiring and powering slightly more challenging
 * it may have enough torque to damage the door handle, some safety precaution might have to be incorporated into the design (weak mechanical link, friction clutch, etc.)
 * It is big and heavy, probably more so than necessary


 * 4)1/10 HP DC Shunt motor, Navy type CAOH-211265-A (27 volts DC, 5.5 Amp)
 * Advantages:
 * It probably has enough torque directly. If it doesn’t it should be easy to reduce with gears/pulleys until it does
 * shaft is well suited for mounting pulleys on it
 * Disadvantages:
 * BIG (6+ inches long x 4+ inches tall/wide) and HEAVY, more so than necessary
 * poses mechanical mounting challenges, partly due to its excessive size/weight, and partly due to an inconvenient configuration of its existing mounting holes
 * It will need a high current (though reasonable voltage) driver amplifier if it is to be used with the arduino


 * 5) Slow speed synchronous timer/clock motor, “Synchron”
 * Advantages:
 * light weight, compact
 * probably plenty of torque
 * well suited to mechanical mounting
 * shaft well equipped for mounting pulley on it
 * Disadvantages:
 * It is intended to operate on 110V, 60 Cy. Power. It would need a high voltage driver amplifier.
 * speed control would have to be accomplished by modulating the frequency of the input power.  There may be very narrow limits within which the motor will run, limiting range of speeds possible (initial tests suggest this is so).
 * Its direction of rotation is determined by pole shade coils, an integral part of the motor field frame structure. The direction of movement would have to be reversed by external mechanical means, such as a transmission or reverse driving motor, with suitable unidirectional couplings where needed.  Alternatively, substantial modifications could be made to the internal structure of the motor, such as adding reversing pole shade coils  or start windings (difficult/expensive) to make it electrically reversible (NOT a serious possibility, there are MANY better solutions than rewinding the motor)


 * 6) Delco gear motor 5069600 (27DC, 250 RPM)
 * During a test at 10 volts DC, I couldn’t stop the shaft with my finger and it drew less than 500 mA at full load.
 * Advantages:
 * PLENTY of torque
 * can be driven directly with the arduino motor shield
 * compact, light weight
 * reversible directly with the arduino (unlike (5) above)
 * Disadvantages:
 * somewhat challenging to mount, no apparent mounting holes
 * shaft is kindof small, might be hard to mount a pulley securely (as of this writing, this problem has been solved with one pulley)
 * it is an antique, very special motor, it might be difficult to find a modern equivalent for production purposes or if others were trying to replicate this project
 * as mentioned above, it is a very special motor; it might be better used in a project which is in greater need of its special qualities (durable, high torque, highly reliable, etc.)


 * 7) DC motor, 24 volts DC, 2.2 Amperes


 * (at 10 volts, draws less than 2A locked rotor current) with included toothed reducing pulley and belt
 * Advantages:
 * very similar motors are readily available today, so repeatability is simple and does not rely on access to antique parts
 * would be completely willing to donate it to the project in the long term, no reservations
 * comes attached to a mounting bracket
 * with included speed reducer, pulley will probably have plenty of torque
 * can safely be driven directly by the arduino motor shield
 * I will have to build a shaft for the speed reducer pulley, so I could make the shaft any way I wanted in order to accommodate mounting a pulley
 * Disadvantages:
 * I would have to build a speed reducer shaft and its bearing mounts
 * The motor operates near the electrical limits of the motor shield capabilities, need to be mindful to not blow out board. I may need to incorporate overload protection in the circuit.