Stepper motor at low speed to increase torque method

1)Choose small step away from the Angle of stepper motor
in the low speed torque gets bigger with the increase of rotor teeth. Choose small step away from the Angle of step motor can obtain high torque. Actually utilized the rotor teeth like 50 tooth, permanent magnet magnetic flux leakage will increase, but not in proportion, this conclusion in 100 teeth of the following are valid. From 1 type three-phase HB stepping motor. 2°（Rotor 50 tooth)Instead of 0. 6°（Rotor 100 teeth), about 1. 4 to 1. Eight times torque at low speed.
2)Bipolar connection
2 times can improve efficiency. It is easy to buy on the market two unipolar or bipolar stepper motor, but bipolar drive power tube is larger than that of unipolar.