All motors convert electrical power, volts and amps, into mechanical power, torque and speed. The unique feature of stepper motors is that they can be very accurately controlled in terms of speed and rotation angle. Stepper motors are brushless DC motors, and as such, require an electronic driver to commutate the windings. In order to control the rotation, electrical pulses are input into the driver, and the motor rotates one step for each pulse. The excellent stability of the motor results in a simple control circuit, since the motor can be run open-loop and no feedback is required.

What is a COB Hybrid Stepper Motor?

A COB hybrid stepper motor is a combination of the variable reluctance and permanent magnet type motors. The rotor of a hybrid stepper motor is axially magnetized like a permanent magnet stepper motor, and the stator is electromagnetically energized like a variable reluctance stepper motor. Both the stator and rotor are multi-toothed.

A COB hybrid stepper motor has an axially magnetized rotor, meaning one end is magnetized as a north pole, and the other end a south pole. Toothed rotor cups are placed on each end of the magnet, and the cups are offset by half of a tooth pitch.