Description of stepper motor parameters (I)

一、Holding torque;

The torque required to rotate the motor output shaft when the two phases of the stepper motor windings are energized with rated DC current. The holding torque is slightly greater than the running torque at low speeds (below 1200rpm);

二、 the rated current;

The current is related to the diameter and number of turns of the winding coil. Generally speaking, the holding torque is basically equal for motors corresponding to the same size, but the high-speed characteristics of motors with large rated current are significantly better than those with small rated current;

三、inductance;

Inductance is also a key parameter for stepper motors, corresponding to the same size motor, a large inductance means that the motor rated current is small, and the high-speed torque is not as good as a small inductance motor;

四、Mechanical precision;

rotor up and down two sections of the wrong tooth precision and stator-rotor air gap balance between the precision (ideal conditions unilateral air gap 0.04mm), mainly affects the motor’s operating torque and smoothness of operation;

五、 Subdivision;

There are two ways of expressing the subdivision of stepper motors; N (400, 1000, 5000, 6400, etc.), N pulses/turn; 1/M (1/2, 1/5, 1/25, 1/25, 1/32, etc.), M subdivision;

Conversion: two-phase motor (1.8 ° step angle) drive, for example, no subdivision (1 subdivision), the drive accepts 360 ° / 1.8 ° = 200 pulses, the motor turns a circle N = 200 * M;.

六、 current;

There are two concepts of current: motor rated current and drive set current. When using, the driver setting current ≤ motor rated current * 1.2, otherwise, the motor may burn out;

七、 Unipolar and bipolar;

There are two concepts of unipolarity and bipolarity:

1, motor: unipolar and bipolar;

2, drive: unipolar and bipolar; unipolar drive can only drive unipolar motor, bipolar drive can drive bipolar and unipolar motor; unipolar motor using unipolar drive and bipolar drive half winding effect is the same;

八、 Signal Inputs;

There are two kinds of signal input: single-ended signal input and differential signal input.

Single-ended signals: 1, common positive: match NPN type controller; 2, common negative: match PNP type controller;

Differential signal: 1, differential: most motion control cards; 2, common positive: signal positive end short; 3, common negative: signal negative end short.