High reliable 86mm stepper

Due to technological progress, integration is occupying the motor control market. Brushless DC motors (BLDC) and permanent magnet synchronous motors (PMSM) of various sizes and power densities are rapidly replacing the motor topologies such as brushed AC/DC and AC induction.
Brushless DC motor/permanent magnet synchronous motor has the same structure mechanically, except the stator winding. Their stator windings adopt different geometric structures. The stator is always opposite to the motor magnet. These motors can provide high torque at low speed, so they are very suitable for servo motor applications.
Brushless DC motors and permanent magnet synchronous motors do not need brushes and commutators to drive the motors, so they are more efficient and reliable than brushed motors.
Brushless DC motor and permanent magnet synchronous motor use software control algorithm instead of brush and mechanical commutator to drive the motor to run.
The mechanical structure of brushless DC motor and permanent magnet synchronous motor is very simple. There is an electromagnetic winding on the non-rotating stator of the motor. Made of rotor permanent magnet. The stator can be inside or outside, and is always opposite to the magnet. But the stator is always a fixed part, while the rotor is always a moving (rotating) part.
Brushless DC motor can have 1, 2, 3, 4 or 5 phases. Their names and driving algorithms may be different, but they are essentially brushless.
Some brushless DC motors have sensors, which can help to obtain the rotor position. The software algorithm uses these sensors (Hall sensors or encoders) to assist motor commutation or motor rotation. These brushless DC motors with sensors are needed when the application needs to be started under high load.
If the brushless DC motor has no sensor to obtain the rotor position, the mathematical model is used. These mathematical models represent sensorless algorithms. In the sensorless algorithm, the motor is the sensor.
Compared with brush motor, brushless DC motor and permanent magnet synchronous motor have some important system advantages. They can use the electronic commutation scheme to drive the motor, which can improve the energy efficiency by 20% to 30%.
Nowadays, many products require variable motor speed. These motors require pulse width modulation (PWM) to change the motor speed. Pulse width modulation provides precise control of motor speed and torque, and can realize variable speed.