# Four-phase stepper motor driver wiring diagram details

### Four-phase eight-wire stepper motor wiring and characteristics

Four-phase eight-wire stepper motor connection: F1, F2 connected to the excitation power supply, H1 and C1 connected to the line, H2, C2 connected to the DC power supply. If you need to reverse only need to change the connection which is: H1 and C2 connected, H2, C1 connected to the DC power supply can be.

The difference between four-phase eight-wire and two-phase four-wire stepper motors:

Two-phase stepper motors have only two windings on the stator, with four outgoing wires, and the whole step is 1.8°, and the half step is 0.9°. In the driver, as long as the two-phase winding current breakage and current direction control. The four-phase stepper motor has four windings on the stator, there are eight outgoing wires, the whole step is 0.9 °, half-step 0.45 °, but the driver needs to control the four windings, the circuit is relatively complex.

### How to wire a 4 wire stepper motor? Note: it’s 5V …. Seek guidance from experts!

Four wires of which two are power lines a signal line a direction control line signal line input pulse signal direction control line input high and low levels Out1-2 and Out3-4 are connected to the two windings of the stepper motor.

stepping drive power supply DC5V (positive and negative)

drive motor power supply DC24V (positive and negative)

the rest of the In1-in4 is the pulse signal terminal, direction control terminal, motor lock terminal.

### 4-phase 8-wire stepper motor wiring diagram

Since only 1,6,2,8 or 1,6,7,4 two coils can be connected to the motor can also rotate normally, so choose any 2 out of the 4 coils and connect them to the driver;

If the motor does not rotate, it means that these 2 sets of coils are A-phase coils; and the other 2 coils are 2 coils of the B-phase;

If the motor rotates, it means that These 2 coils are A-phase and B-phase coils;

After connecting the 2 sets of coils and letting the motor rotate, choose one coil from the remaining 2 coils and connect it in series on the A-phase coil; if the motor rotates normally, it means that the coil is another coil of A-phase;

If the motor doesn’t rotate, adjust the positive and negative of the coil and try it again; if the motor doesn’t rotate, it means that the coil is another coil of B-phase;

If the motor doesn’t rotate, try again after adjusting the positive and negative of the coil. If the motor doesn’t turn, the coil is another coil for phase B.

Using the same method as above, the polarity of the last coil can be determined.

Four-phase eight-wire stepper motor connection: F1, F2 connected to the excitation power supply, H1 and C1 connected with a wire, H2, C2 connected to the DC power supply. If you need to reverse just change the connecting line which is: H1 and C2 connected, H2, C1 connected to the DC power supply can be, the connection is shown in the following figure:

Extended information

Basic principles

Operating principle

1, usually the motor’s rotor for the permanent magnets, when the current flows through the stator windings, stator windings produce a vector magnetic field. This magnetic field will drive the rotor to rotate at an angle, so that the direction of the rotor’s pair of magnetic fields is the same as the stator’s magnetic field direction. When the vector magnetic field of the stator rotates by one angle. The rotor also rotates one angle with that magnetic field.

2. For each input electrical pulse, the motor rotates one angular step forward. It outputs an angular displacement proportional to the number of input pulses and a rotational speed proportional to the frequency of the pulses. Change the order of the winding energized, the motor will be reversed. Therefore, it is possible to control the number of pulses, the frequency and the order of energization of the windings of each phase of the motor to control the rotation of the stepper motor.

Heating principle

1, usually seen in all kinds of motors, the internal core and winding coil. Winding resistance, power will produce loss, loss size and resistance and current is proportional to the square, which is often referred to as copper loss, if the current is not standard DC or sine wave, but also produce harmonic loss; core hysteresis eddy current effect, in the alternating magnetic field will also produce loss, the size of the material, current, frequency, voltage, this is called iron loss.

2, copper loss and iron loss will be expressed in the form of heat, thus affecting the efficiency of the motor. Stepping motor general pursuit of positioning accuracy and torque output, efficiency is relatively low, the current is generally larger, and high harmonic components, the frequency of current alternation also varies with the speed, and thus the stepping motor is commonly found in the case of heat, and the situation is more serious than the general AC motor.

Note