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QUOTE: (start) NORTON: For your consideration. A DC motor that has not overheated and shorted out its windings will never draw more than its stall current. If the load is too great causing it to stop moving it will simply draw its stall current. Nothing more. As long as its moving it will draw less than its stall current. Most DC motors are NOT stall motors. They will draw their stall current until they overheat and short out. Tortoise uses stall motors. Not to be confused with the motors in your engines. Pete QUOTE: (end) Thanks for the detailed helpful information. This would have resolved many issues if brought up much sooner. The stall motor rated (stop stall amperage) is rated the same as the (start-up amperage). Completely knowing how a Tortoise switch machine actually functions, will resolve many issues. I did some re-search when it comes to the Tortoise switch machine. I wanted to know exactly how it electrically functions. A switch machine stall motor is always drawing DC voltage. Tortoise switch machine: (3 pole stall motor) (12 VDC) (0.016 amperage) (750 ohms) (0.192 watts) = (0.00026 mechanic HP) In comparison: (2 pole motor) (12 VDC) (.50 amperage) (24 ohms) (6 watts) = (0.008 mechanic HP) A regular DC motor has around (0.008 mechanic HP), while a Tortoise switch machine has only (0.00026 mechanic HP). That is why there are many so many step down gears (ratio 275:1) being required to operate this switch machine.
The Tortoise switch machine will only draw (0.016 amperage). According to a AWG chart, a AWG #32 is only a (.008" Dia.) wire. In a chassis wiring system, a AWG #32 will handle (0.53 amperage)!! In a power transmission wiring system, a AWG #32 will only handle (0.091 amperage)!! The difference between AWG chassis wiring system and AWG power transmission, also applies to all AWG wire #'s. A chassis wiring system, uses short internal single wires. A power transmission wiring system, uses long external wrapped wires. For example, would you use a AWG #32 a (.008" Dia.) wire, rated at chassis wiring of (0.53 amperage), over a long distance??
Many years ago, there was a manufacture that built a very high quality switch machine, using a DC motor, rack and pinion gear movement, with two direct SPDT superior mechanical switches. This manufacture could not compete against the cheaper quality built Tortoise switch machine. In a few circumstances, I had to totally disassemble a Tortoise switch machine. I had to remount a copper wiper plate, with two wipers to the internal swing arm.

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Ste 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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