View Full Version : Resistance not high in wire Identification of stepper

09-16-2007, 11:14 AM
I have 2 types of stepper motors from HP 640C printer.both have 5 black wires coming out of them. none of the two wires have infinite resistance between them.one of the wires has half the resistance with all other wires, compared to the resistance other wire pairs have between them.
how do i recongnize the terminals?? do these motors have enough torque to drive a robot ?? Please Help.[/quote]

09-16-2007, 02:47 PM
Quite Surprising!! :!: Why dont you try measuring the continuity instread of the resistance. Do this : Number the wires on your own (say 1 to 5), then measure contiuity between 1 and 2, 1 and 3, 1 and 4, 1 and 5, 2 and 3 etc...
Also it could be your motor is not a stepper, I smashed open an Epson 2100 and found DC Motors to my disapointment.

09-17-2007, 09:51 AM
you arent finding infinite resistance between any two terminals bcos the center taps of both the coils are shorted.
the terminal with which you are getting half the resistance with other wires is the common center tap.

you can see the number on the motor and search it up on the web for more specs

09-17-2007, 11:52 AM
The motors are indeed stepper motors.http://www.smcelectronics.com/printrep.htm
The 11th(Service Station Stepper Motor Assembly. (RFE)) and the
16th(Paper Stepper Motor Assembly. (RFE)) are the motors which I have.
How do I recognize the terminals other than the 'Centre Tap'.
Do these motors have enough torque to drive a robot.
or should I go for DC motor ??? I have to build an infra-red source tracking robot.

09-17-2007, 03:29 PM
do u need to know the position of the robot ?? if not go for DC motors.

09-19-2007, 11:10 AM
These are 24V steppers.
Dont have much torque and negligible @12V.
Go for DC motors!