The working principle and maintenance of stepping motor

Date: 2017-08-14

Usually the rotor of the motor is a permanent magnet, and when the current flows through the stator winding, the stator winding produces a vector magnetic field. The magnetic field will drive the rotor to rotate at 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 stator's vector magnetic field rotates an angle. The rotor also rotates with the magnetic field at an angle. Each time an electric pulse is input, the motor rotates one angle forward. The angular displacement of the output is proportional to the number of pulses entered and the speed is proportional to the pulse frequency. Change the order of the winding power, the motor will reverse. It is possible to control the rotation of the stepping motor by the number of control pulses, the frequency and the energization sequence of each phase winding of the motor.

Laser stepper motor maintenance Note:

The stepper motor is an actuator that converts electrical pulses into angular displacements. Popularity: CNC fiber laser cutting machine When the stepper driver receives a pulse signal, it drives the stepper motor in the set direction to turn a fixed angle (ie, the stepping angle). You can control the number of pulses to control the amount of angular displacement, so as to achieve the purpose of accurate positioning; At the same time you can control the pulse frequency to control the motor speed and acceleration, so as to achieve the purpose of speed. 1, stepper motor heat reasons: for a variety of stepper motor, the internal are composed of core and winding coil. The resistance is generated by the resistance, the power consumption will produce loss, loss of size and resistance and current is proportional to the square, which is what we often say that the copper loss, if the current is not a standard DC or sine wave, but also produce harmonic loss; Vortex effect, in the alternating magnetic field will produce loss, its size and material, current, frequency, voltage, called iron loss. Copper loss and iron loss will be expressed in the form of heat, thus affecting the efficiency of the motor. CNC plasma cutting machine Stepping motor is generally the pursuit of positioning accuracy and torque output, the efficiency is relatively low, the current is generally large, and the harmonic component is high, the frequency of alternating current also changes with the speed, and thus steep motor prevalence of heat, And the situation is more serious than the general AC motor. How to reduce the heat of the stepper motor: reduce heat, that is, to reduce copper loss and iron loss. Reduce the copper loss in two directions to reduce the resistance and current, which requires the selection of the smallest choice of resistance and small current rating of the motor, the two-phase motor, can be used in series motor without parallel motor. But this often contradicts the requirements of torque and high speed. For the selected motor, you should take full advantage of the drive's automatic half-flow control function and off-line function, the former in the motor is static when the automatic reduction of current, the latter simply cut off the current.

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