Guide
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Basic concepts of EMI
Basic concepts of EMI
2017 - 07 - 28
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Basic conceptsa. EMC, EMI and EMSElectromagnetic Compatibility (EMC) means the compatibility of products that are in the same electromagnetic environment (electric field and magnetic field). It has 2 ...
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Fundamental knowledge of magnet
Fundamental knowledge of magnet
2017 - 07 - 28
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Magnetic circuitThis article tries to introduce PMDC motor’s magnetic circuit by the most acquainted concepts. It also tries to introduce some characteristics and parameters of the motors by means of ...
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Basic concept
Basic concept
2017 - 07 - 28
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Basic conceptsMotor is an energy conversion device that converts electric energy into mechanical energy or mechanical energy into electric energy, using magnetic field as media.PMDC motor is an energy...
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Conclusion

Conclusion
We can’t illustrate EMC requirements of all products in such an introductory essay. Before we end this essay, there are 2 products to be specifically mentioned.
a. Automotive PMDC motors
There are testing standards and limitation specified with EMI and EMS for automotive components in ISO 11452, IEC/CISPR 25 and GB 18655. Radiated emission test is tested with antenna and test receiver at the frequency of 150KHz to 2.5GHz. The upper limit is to be further extended. Testing method at the frequency range of 2.5GHz to 18GHz is under consideration. Conducted emission test is also specified according to different length of the power cord.
b. Hair dryers and heat guns
Such products use grid electricity. The input voltage is divided by the resistive heater wire and rectified. Because
of the diode junction voltage drop and hysteresis effect of the motor inductive laod, the voltage will have wave
distortion, generating a lot of harmonic waves. Therefore customers usually ask for harmonic current test
besides the conducted emission test. Applicable standards are IEC61000-3-2, EN61000-3-2 and GB17625 etc..

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