How to determine the phase sequence of a four phase stepper motor?

To determine the phase sequence of the three-phase power supply, a special phase sequence checker can be used (the instrument has the best finished product). When using, connect the three wires of the instrument to the three phase wires of the power supply. Plug it in.

At this time, if the lamp marked "positive" is brighter than the lamp marked "reverse", it means that the power phase sequence and the phase sequencer wiring are the same; If the "inverse" light is brighter than the "positive" light, it means that the power phase sequence is opposite to the phase sequencer. At this time, you can arbitrarily change the wiring and try again after powering on.

After the phase sequence of the power supply is determined, it is marked on each line end with three colors of yellow, green, red or code codes such as A, B, C, U, V, W, L1, L2, L3. The logo should be firm and clear.

1. The internal leads are different

The two-phase motor lead wire is 4;

The lead-out wires of the four-phase motor can be 5 or 6;

2. Different ways of working:

The stator of the two-phase motor has windings and the rotor is composed of soft magnetic materials. The structure is simple, the cost is low, the step angle is small, the dynamic performance is poor, the efficiency is low, the heat generation is large, and the reliability is difficult to guarantee.

Permanent magnet type of four-phase motor: The rotor of the permanent magnet stepper motor is made of permanent magnet material, and the number of poles of the rotor is the same as the number of poles of the stator. It is characterized by good dynamic performance and large output torque, but this kind of motor has poor accuracy and large step moment angle (generally or 15°).

Stepper motors cannot be connected directly to DC or AC power sources and must use a dedicated drive power stepper motor driver.

The four-phase stepper motor is powered by a unipolar DC power supply, as long as the windings of each phase of the stepper motor are energized according to the appropriate timing, the stepper motor can be stepped and rotated.

When the stepper driver receives a pulse signal, it drives the stepper motor to rotate at a fixed angle in the set direction, and its rotation runs step by step at a fixed angle.

The angular displacement can be controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning; At the same time, the speed and acceleration of the motor can be controlled by controlling the pulse frequency, so as to achieve the purpose of speed regulation.

Suppose the 2-phase 6 lines are red, white, and brown in a group; yellow, black, orange group; The center taps are white and black. Using the ohmic range of the multimeter, the resistance between the red line and the white wire is equal to the resistance between the white and brown wires, and the resistance between the red and brown wires is twice the resistance between the red and white wires. Similarly, the resistance between the yellow and black wires is equal to the resistance between the black and orange wires, and the resistance between the yellow and orange wires is twice as high as the resistance between the yellow and black wires.

There is no communication between the two sets of lines.

As can be seen from the above explanation, first use a multimeter to find out the two sets of wires that are connected, and then measure the resistance value between the three wires in each group separately, and the resistance value of the other two wires in the same group is the same as the center tap wire.

In addition, the multimeter hits the resistance to 200 ohms, and selects a wire arbitrarily to connect to one end of the meter pen. Use the other pen to touch the other leads in turn. Only 2 of the remaining 5 will be able to measure the resistance.

If the 2 resistors measured are the same, congratulations, this one is a center tap. If one resistor is r, and the other must be close to 2r, then the r-resistance is the center tap. These 3 wires are in a group.

In this way, find the center tap of the other 3 sticks. It is impossible to distinguish the color by looking at it, and the color is different from different manufacturers.

How to distinguish the phase sequence of stepper motors.

Judging from your question, it should be a two-phase unipolar stepper motor, what brand do you use? Just tell me and I'll know how it's wired; Our company's general is 4-wire bipolar, the simplest way, you can also use a wire and another wire to screw together, to rotate the rotor of the motor, if there is resistance, it may be in phase, and it can be separated in turn, a + a - b + b - ....

It is two-phase and six-wire.

You can clamp the white line to measure the other five lines, and there must be two lines that are the same as the white line. For example, if the resistance of the white and black wires is 5 ohms, and the brown wire is 10 ohms, then their center line is the black line. And so on, and so on, you can find two center lines. Hope it can help you.

The principle of a four-phase stepper motor is to rely on the change of air gap magnetic conductance to generate electromagnetic torque.

Usually the rotor of a motor is a permanent magnet, and when an electric current flows through the stator windings, the stator windings generate a vector magnetic field. This magnetic field causes the rotor to rotate by an angle so that the direction of the pair of magnetic fields of the rotor coincides with the direction of the magnetic field of the stator. When the vector magnetic field of the stator rotates by an angle.

The rotor also rotates at an angle with this magnetic field.

With each input electrical impulse, the motor rotates an angle to take a step forward. The angular displacement of its output is proportional to the number of pulses input, and the rotational speed is proportional to the pulse frequency. Change the order in which the windings are energized, and the motor will be reversed.

Therefore, the rotation of the stepper motor can be controlled by controlling the number of pulses, the frequency and the energizing sequence of each phase winding of the motor.

The working principle of a stepper motor.

Stepper motors are purely digitally controlled motors. It converts the electrical pulse signal into angular displacement, that is, to give a pulse signal, the stepper motor will rotate an angle, so it is very suitable for single-chip microcomputer control. The stepper motor can only be operated by the pulse power supply, it cannot directly use AC power and DC power supply; In addition, the angular displacement of the stepper motor is strictly proportional to the input pulse, so when it turns once, there is no cumulative error and has good follow-up.

The stepper motor consists of two parts: a stator and a rotor. Taking a four-phase stepper motor as an example, there are four sets of opposing magnetic poles on the stator, and each pair of magnetic poles is wound with the same winding to form a phase. The stator and rotor are dotted with multiple tines of the same size and spacing.

When a certain phase of the stepper motor is energized to form a magnetic field, the rotor is forcibly pushed to the position of maximum permeability (or minimum magnetic resistance) under the action of electromagnetic force.

The four-phase stepper motor used in this module needs 64 steps to move in the eight-row working mode; A lap is divided into 64 scales, so it takes 64 64 steps to walk around in one lap, or 4096 steps. In addition, each phase must be energized in a certain order in order to normally complete the action of four steps and one tooth pitch. The phase voltage is 12V, other parameters according to the motor model, check the relevant information, the motor model used in this module is:

Type 28BYJ48.

The power-on sequence is shown in the figure below

Figure 3-61 Lead Color Pin No. 1 2 3 4 5 6 7 8

Red 1

Orange 2

Yellow 3

Pink 4

Blue 5

The stepper motor has four lead-out wires. The red wire of the stepper motor wiring plug corresponds to the end of the 5-pin socket marked 1 on the module circuit board, and the blue wire corresponds to the end marked 5.

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