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江河数控、雕刻机

2013-06-22 12:56How to solve the engraving machine motor heat

Our CNC engraving machine for everyday use in the process, often encounter the problem of motor heating, electrical heating although generally not affect the life of the motor, but it will take some serious negative effects fever, internal motor parts caused by different thermal expansion coefficients of structural stress changes and small changes in the internal air gap, will affect the dynamic response of the motor, high-speed operation may easily lead to loss of synchronism.

Engraving machine stepper motor inside the core and windings are composed of windings resistance, power will produce losses, loss of size and resistance and current proportional to the square, which is what we often say that the copper meteorite, if the current is not the standard DC or sine wave, but also produce harmonic losses. Vortex core with hysteresis effect, the alternating magnetic field will produce loss, the size of the material, current, frequency and voltage, the called iron loss. Copper loss and iron loss are manifested in the form of heat, thus affecting the efficiency of the motor, stepper motor generally focus positioning accuracy and torque output, efficiency is relatively low, the current is generally relatively large, and a high harmonic components, the frequency of the alternating current also change with the speed, and thus heat conditions prevailing stepper motor, and the situation is serious than the general AC motor.

Heating of the motor we should carry out the necessary control depends primarily on how to solve the internal motor insulation levels, internal insulation properties at elevated temperatures (above 130 degrees) will be destroyed, so long as no more than 130 degrees, the motor heat allow to what level, the motor will not be damaged, but this time in the surface temperature below 90 degrees, so that the stepping motor surface temperature of 70-80 degrees are normal. Simple temperature measurement methods can be roughly determined by hand can touch more than 1-2 seconds does not exceed 60 degrees, hand touches only about 70-80 degrees, drop a few drops rapidly gasification is more than 90 degrees up. Reduce copper loss in two directions, how to reduce motor heating, reducing electricity yin and current, which requires the selection of resistance when you try to choose a smaller size and the rated current of the motor, for two-phase motor, can be used in series with the motor would not motors in parallel, but this is often associated with torque and speed requirements conflict, the motor has been selected, you should take advantage of the automatic half current drive control functions and offline functionality, the former when the motor is automatically reduced quiescent current, the latter the current is cut off altogether. Another sub-drive because nearly sinusoidal current waveform, harmonics less motor heating will be fewer ways to reduce iron loss small, the voltage level in connection with high-pressure-driven motor, although it will bring high-speed characteristics of the upgrade, but also bring heat increases, so should select the appropriate drive voltage levels, both high band resistance, stability and heat, noise and other indicators.

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