A stepper motor can have two step angle, such as 3 degrees /1.5 degrees, what is the meaning of this?
Also called the maximum static torque at rated current, is applied into the motor shaft under static electricity in step without generating the maximum torque continuous rotation. It is one of the most important parameters of the stepper motor, stepper motor is usually in the low-speed torque to maintain the torque. Because of increasing output torque of stepping motor with the speed of continuous attenuation, the output power also increases with the speed change, so as to maintain torque on the stepper motor to measure one of the most important parameters. For example, when people say that the stepper motor 2N.m in the absence of special circumstances that means holding torque stepper motor for the 2N.m step.
The motor step angle inherent: it says each made a step pulse signal control system, the motor rotation angle. The factory motor gives a step angle value, such as 86BYG250A type motor is given a value of 0.9 DEG /1.8 DEG (said half step work for 0.9 degrees, the whole step is 1.8 at this step,) can be called the "inherent motor step angle.
And it is not necessarily the actual step angle when the motor is working, the actual step angle and drive. (2) the number of phase stepping motor: refers to the number of the motor coil group, currently there are two phase and four phase and five phase stepper motor. The motor phase number, the step the angle is different, the general two-phase motor step angle is 0.9 DEG /1.8 DEG, three-phase 0.75 DEG /1.5 DEG, five phase is 0.36 DEG /0.72 DEG. Step motor phase number increase can improve performance, but the structure of the stepper motor and the driving power supply will be more complex, the cost will increase. (3 keep the torque (HOLDING TORQUE))