8mm Forum: Eumig 810/824 motor amp?

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Posted by Brian Collins (Member # 761) on January 29, 2009, 05:33 AM:

Want to fit a power controller to regulate motor speed on Eumig 810/824 but require to know what amperage and wattage is drawn on these motors, can any technical buffs out there tell me please

Posted by Martin Jones (Member # 1163) on January 29, 2009, 05:58 AM:

Brian,

I'll dig out my 824 this evening and measure current etc. for you. Easy to do as my machine has a "break-in" plug for the motor circuit mounted on the back.

Martin

Posted by Brian Collins (Member # 761) on January 29, 2009, 07:11 AM:

Thanks Martin

Posted by Martin Jones (Member # 1163) on January 29, 2009, 08:44 AM:

Measurements taken on the motor of an 824 while running give the following results;-

Voltage across motor = 220 VAC
Motor current = 0.46 A

I don't know whether one can control the speed of this particular motor by reducing the voltage with a resistor in series, but trying it should not harm the motor.
To reduce the voltage by 10%, 50 ohms should be placed in series with one of the motor leads (Blue/Yellow on my machine). Best would be a rheostat of about 120 ohms maximum and of 25 watts minimum rating. Connect in series, with the rheostat set to zero ohms, switch on (CAREFUL.... THE RHEOSTAT ELEMENT IS AT MAINS VOLTAGE!) and increase the resistance gradually. Any change of speed should be audible. Set the rheostat to give the lowest speed you require; if the rheostat is too hot use one of a higher wattage rating. If the speed does change significantly, but you cannot get a low enough speed you need more resistance (and a higher wattage rated rheosat).

BUT, if there is no speed change, or very small, then the motor is probably an induction motor and you will need a thyristor motor speed change circuit(not my expertise).
Someone else on the Forum may be able to help; it must be capable of feeding a 220volt 150 watt motor.
Also the 375w controller on this page....

http://www.quasarelectronics.com/cr0008.htm

seems to be suitable (the link to the user manual .PDF is incorrect).

Email me if I can help further.
Martin

[ January 29, 2009, 12:39 PM: Message edited by: Martin Jones ]

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