(1) Step angle accuracy: the error between the actual value and the theoretical value of the stepper motor for each turn of a step angle. Expressed as a percentage: error / step angle * 100%. The value is different for different operating beats, four beats should be within 5% of the operation, eight beats should be within 15% of the operation.

(2) Lost step: The number of steps of motor operation is not equal to the theoretical number of steps. Called as lost step.

(3) misalignment angle: the angle of the rotor tooth axis offset from the stator tooth axis, motor operation must exist misalignment angle, the error generated by the misalignment angle, the use of subdivision drive is not resolved.

(4) maximum no-load starting frequency: the motor in a certain drive form, voltage and rated current, in the case of no load, can directly start the maximum frequency.

(5) maximum no-load operating frequency: motor in a certain drive form, voltage and rated current, the highest speed frequency of the motor without a load.

(6) operating torque frequency characteristics: motor in a certain test conditions measured in the operation of the output torque and frequency relationship curve is called operating torque frequency characteristics, which is the most important of the many dynamic curves of the motor, but also the fundamental basis for motor selection. As shown in the figure below: Other characteristics are inertia frequency characteristics, starting frequency characteristics, etc. Once the motor is selected, the static torque of the motor is determined, but the dynamic torque is not. The dynamic torque of the motor depends on the average current (not static current) when the motor is running, the higher the average current, the higher the output torque of the motor, that is, the harder the frequency characteristics of the motor. As shown in the figure below: where curve 3 has the highest current, or voltage; curve 1 has the lowest current, or voltage, and the intersection of the curve and the load is the maximum speed point of the load. To make the average current is large, increase the drive voltage as much as possible, so that the motor with small inductance and large current is used.

(7) the resonance point of the motor: stepper motors have a fixed resonance area, two, four-phase induction sub-type resonance area is generally between 180-250pps (step angle of 1.8 degrees) or in about 400pps (step angle of 0.9 degrees), the higher the motor drive voltage, the higher the motor current, the lighter the load, the smaller the motor volume, the resonance area is shifted upward, and vice versa, in order to make the motor output The higher the motor drive voltage, the higher the motor current, the lighter the load, the smaller the motor volume, the more the resonance area is shifted upward, and vice versa, in order to make the motor output torque, not to lose step and the whole system noise reduction, the general working point should be offset more resonance area.

(8) motor forward and reverse control: when the motor winding power sequence for AB-BC-CD-DA or () for positive rotation, power sequence for DA-CD-BC-AB or () for reverse rotation.