Connecting the Sanyo Denki Step-Syn 103-771-16 Stepper Motor

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This Step-Syn model is an out of production single stack NEMA23 unipolar stepper motor with a single shaft. Information is pretty sketchy; based on the nameplate, internet searches, and experimentation here are my best guesses at the specifications:

ValueUnit
Degrees Per Step1.8Degree
Rated Voltage24VDC
Rated Current0.18A
Estimated Max Torque70oz-in
Coil Resistance260Ohm

Wire Colors:

  • Common: BLACK
  • Coils: RED/BLUE, ORANGE/YELLOW

Drive Sequence (to turn Clockwise when facing the front of the motor):

  • Wave Drive (1-phase): RED, ORANGE, BLUE, YELLOW
  • 2-Phase Drive: YELLOW/RED, RED/ORANGE, ORANGE/BLUE, BLUE/YELLOW

Sample connections to a Allegro Microsystems UCN5804 Unipolar Stepper Driver:
(Note: driver setup for 2 phase drive, turn clockwise when facing front of motor)

PinSignalConnected To
1Output BStep-Syn ORANGE wire
2K BD+24VDC
3Output DStep-Syn YELLOW wire
4GroundGround
5GroundGround
6Output CStep-Syn BLUE wire
7K AC+24VDC
8Output AStep-Syn RED wire
9One PhaseGround
10Half StepGround
11Step InputTTL Step Input Signal
12GroundGround
13GroundGround
14DirectionGround
15Output Enable LowGround
16Vdd+5V
+24VDCStep-Syn BLACK wire