# The necessary foundation for correct selection of stepping motor

by：V&T Technologies     2020-01-15
Stepping Motor has step angle (Involving Phase number), Static torque, and current. Once the three elements are determined, the model of the stepping motor is determined. 1. Selection of step angle when selecting step angle of stepping motor, we must pay attention to the parameter is the ability of load resolution, convert the load of the system, and then connect other shafts, in this way, the angle of rotation required by the stepping motor can be obtained, which is smaller than this angle and can only be equal to this angle when selecting the step angle. In specific engineering practice, the step angle of stepping motor is generally 0. 36 degrees/0. 72 degrees (Five phases), 0. 9 degrees/1. 8 degrees (Second and fourth phases)1. 5 Degrees/3 degrees (Three-phase)Wait. 2. Selection of static torque the selection of static torque the type of system load determines the selection of stepping motor and its related static torque parameters, the inertia and friction load are the main parts of the system load. When considering these two kinds of loads, the load related to acceleration is inertial load. When maintaining uniform operation, the main load considered is friction load. In engineering practice, the static torque generated by stepping motor is generally larger than friction load, so after determining its static torque, various sizes of stepping motor can be selected, then the base of the stepping motor is determined. 3. Selection of current the moment-frequency characteristic of the current selection system determines the selection of its current. When the static torque of the stepping motor is unchanged, the current is different, the performance of the motor is different. In engineering practice, when the deceleration of the stepping motor increases, the torque will increase and the required current will increase accordingly, so the voltage will be higher when driving. Therefore, only when the voltage of the driving current is mentioned can the current of the stepping motor be mentioned, so some motors with small inductance and large current should be selected when selecting. 4. Conversion of torque and power stepping motors are generally used for speed regulation in a large range, and their power changes. Generally, torque is only used to measure. The conversion of torque and power is as follows: P = Ω·M; Ω= 2 & pi; ·n/60; P = 2 & pi; NM/60 its P is the power unit of Watt, Ω Is the angular velocity per second, the unit is Radian, n is the rotational speed per minute, M is the torque unit is Newton ·M p = 2 & pi; fM/400 (Half Step work)Where f is the number of pulses per second (PPS for short). TAG
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