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I recently bought a couple of these little motors to drive a small linear slide. The RC circuit calls for a 500 ohm resistor 5 watt (which is easy to find) and a .75 mfd 330v run capacitor (which is not so easy to find). What happens if a 1 mfd unit were substituted. How would it affect the...

Its a sync motor, not a stepper. I was told it was a stepper but looked it up . . . and it is a sync motor and there is a single phase rc circuit for it. Thanks gents

can this small motor be hooked up to single phase to run only at one speed or does it need elaborate control.

I just used the bridge rectifier diode on this . . . no capacitor or dropping resistors . . . and the motor works great with no overheating, etc. Thanks for all the help.

ScottyUK When I first hooked up the large bridge rectifier and connected it to the motor armature and field, my voltmeter read 118v. I then put the 1000uf capacitor in the circuit but did not connect the motor leads. It read 162volts . . . which is too high for a 115v motor. I was told on...

swgrmbg . . . I thought dc output from full wave bridge rectifier was 1.414*120V . . . from 120v ac source. When you state 1.414*.636*120 . . . .what is the .636 for?

It Smoked . . . so the true dc voltage is 162v. I wonder if that is cooking my 115vdc armature and shunt? The output on the motor is supposed to be 58 rpm and it is running at like 72 rpm. I would be happy with the motor running like it is if it doesn't damage the motor? Otherwise I would...

I bought a bridge rectifier for this small motor armature and field. The rectifier is quite oversized at 600v and 60A. When connected to the standard 120v ac house source, the rectified voltage was 118v dc rather than 1.4X120V or 168 v like I expected. Motor and field voltage is 115v. I tried...

Thanks for all of the help. I am going to use the circuit that UKPETE suggested. . . which was to connect both field and armature in parallel to one common supply bus from the bridge rectifier and use a dropping resistor in series with that connection. Although the wave form to the armature...

So in putting this together, if field resistance is 1265 ohms and voltage coming out of bridge rectifier circuit is 168 volts and only 115 v dc is needed or a difference of 53 volts . . . the the resistance needed in series with the field is v=ir or 53=I r andextimating I in field at .1A or 530...

Waross Thank you for your reply. After I find out whether the 1265 ohms I measured is correct for the field, then I will put a rheostat in series with it and experiment with field weakoning. I have a 0 to 90 vdc controller that is meant for pm and will just use it and set it at 90 for the...

DavidBeach David . . . I didn't know about the emf in the equation. If I subtract out the 67volt emf, which leaves 48v and apply V=Ir . . . the resistance I would get matches what I measured across the external armature leads. Does that confirm that armature resistance is 146 ohms . . . just...

Have a small DC shunt wound gearmotor. Nameplate shows 115vdc; armature current .33A. If I measure the leads coming from the motor, I get 145 ohms for the armature, and 1268 ohms for the field. Knowing that the field and armature are internally connected in parallel, I am wondering what the...

Gunnar What does the circuit look like with the 4 1N4004 diodes. And I think you suggest connecting this circuit directly to the incoming 115v ac. Richard29e5

Have a small 1/50th shunt wound gearmotor with output speed of 57 rpm. I want to just run it at constant speed 57rpm output. I have a controller that is meant for a PM motor. It has 90v dc out and a pot. Could I use this simple controller and connect both the armature and field to the 90 v...