How do I deal with an unknown stepper motor?

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How do I deal with an unknown stepper motor?
There are bipolar and unipolar stepper motors. Bipolar motors have a single winding per phase. A unipolar stepper motor has one winding with centre tap per phase. A unipolar motor has its coil ends pulled down ( or up) for excitation with the same current direction while its centre tap is held at the same voltage. In a bipolar motor each end of a coil is switched up and down to the voltage supply to cause a current reversal.

The number of leads and the continuity between the coils and the value of resistance of the coils will give a clear picture what type of motor it is. Then if one follows the binary logic of the possible states the leads out of the motor can be supplied with, the excitation for a particular rotation can be deduced. Start with a low voltage just enough to move the shaft and then apply a suitable voltage where the temperature of the motor will decide the voltage selection. A bipolar motor is normally better than a unipolar motor due to the reversal of the currents in the coils. A few mechanical single throw or change over switches mounted on a piece of wood does make the “ research” much easier.
Cloudray Stepper Motor Series has set the standard for quality, reliability, and durability in stepping motors. The precision of our Torque Power motors is matched only by the dependability of their performance. All Torque Power motors are bi-directional and totally enclosed with permanently lubricated ball bearings for long-lasting, smooth operation.
Cloudray stepper motor series are widely used in medical instruments, robotics, 3D printers, extruders, laser cutters, engraving machine, textile equipment, packaging machinery, CNC machines, etc. nema 23 bipolar stepper motor for 3D printer and CNC
 
High Torque, High Precision and Long life is Cloudray's core advantages
Low vibration,Low heating, No loss of step
Fast Response,Better Acceleration Performance
Thanks to a robust design they can be selected for the harshest environments. Precise, open-loop, speed and position control can be achieved with the application of full step, half step, or microstepping electronics.
nema 23 bipolar stepper motor for 3D printer and CNC
Higher Resolution,Avoidance of Resonance Regions
Stepping angle is adjustable( rang in 18°±5%), 0.9 °stepper motor's stepping angle is smaller, fineness is higher and positioning is more accurate.Avoiding vibration,runs more smoothly and gets lower noise.
nema 23 bipolar stepper motor for 3D printer and CNC
Sturdy structure, extremely long life
High quality materials including bearings and shaft made in Japan
Robust assembly, high speed range, and exceptional performance in even the harshest environments make Cloudray Stepper Motors the perfect solution for demanding positioning applications.
nema 23 bipolar stepper motor for 3D printer and CNC
Short length and light weight allow them to be used in highly integrated systems
nema 23 bipolar stepper motor for 3D printer and CNCnema 23 bipolar stepper motor for 3D printer and CNCnema 23 bipolar stepper motor for 3D printer and CNC
Cloudray stepper motor factory video
Stepper motor application
Cloudray stepper motor and Stepping Motor Driver are widely used in engraving machine, cutting plotter, textile machine, 3D printer, medical devices,stage lighting equipment, robot, CNC machine, music fountain and other industrial automatic equipment.
nema 23 bipolar stepper motor for 3D printer and CNC
nema 23 bipolar stepper motor for 3D printer and CNC
nema 23 bipolar stepper motor for 3D printer and CNC

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