[GreenKeys] LPW 300 paper winder

[Duncan Brown]

Bruce,

When I said it was a "sync" motor, I was speaking generically. It looks 
like the standard phonograph motor. There is no starting capacitor.

It does not have a slip clutch.
There is a mercury switch on a bail that is operated by the paper being 
wound up, such that just before the paper gets tight, the switch opens, 
shutting off the motor.  When there is slack in the paper, the bail 
falls and the motor turns back on. Perhaps the resistor was a safety 
feature to prevent motor burn-out, but some one disabled it.

Thanks,

Duncan
K2OEQ

On 31-Mar-18 14:33, Bruce Gentry wrote:
> Does the winder have a slip clutch to allow the motor to turn while 
> the takeup spindle turns slowly or stops? If it does not, the resistor 
> almost   certainly goes in series with the motor. It is very unlikely 
> the motor is synchronous if there is no slip clutch, they don't have 
> much starting torque it's probably shaded pole or capacitor start. 
> Those two types can produce a reasonable starting torque at reduced 
> voltage and be stalled or nearly stalled for long times if they have a 
> resistor or other means to limit current.
>
>       Btruce Gentry, KA2ivy
>
>
>
> On 3/30/18 8:47 PM, Duncan Brown wrote:
>> I just acquired a LPW 300 paper winder. In checking it out, I found 
>> that there is a large power resistor (cant read it, but parts list 
>> says 600 Ohms) mounted next to the motor, but it has been taken out 
>> of the circuit.
>>
>> Did this resistor go in series with the motor?? (but it is a synch AC 
>> motor).
>>
>> Anyone know its purpose?
>>
>> Thanks,
>>
>> Duncan
>> K2OEQ
>>
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