Why does the dc permanent magnet electric opportunity produce the noise?
Release time：2018-3-13 14:59:53 Number of clicks：486
Main structure of the motor: there is a permanent magnet, rotor (coil), commutator brush, commutator; After the motor is connected to the direct current, the charged coil of the rotor becomes an electromagnet, which will turn on the magnetic force of the permanent magnet (discovered in 1820); As the rotor spins, the current in the coil changes direction because of the commutator, changing the magnetic pole of the rotor (electromagnet) so that the rotor can rotate continuously. In a word, the motor is the electrical energy of the power source, which is converted into mechanical energy and is output through the shaft; Mechanical energy output structure includes two kinds: drive mode - motor output rotation, through the use of a series of gear box or other customer parts will turn into a low-speed rotation, translation and so on other movement way; Vibration mode - provides vibration function by driving the swing of the pendulum.
What is the reason for the noise generated by the dc permanent magnet? Is it time to live? Actually, not all dc motors are noisy for long. It is found that noise is usually caused by the following three reasons:
: 1, the dc motor bearing to replace general dc motor bearing to exclude, bearing surface seems to be intact, but many factor is likely to be injured bearing: pressure bearing pressure into the force point is wrong, when the shaft and bearing fit tight, put into the bearing chamber bearing load is too large or the rotor balance caused by bearing the radial force is not equal.
2. Generally, the main body of the carbon brush is not smooth enough, which is not good enough for the grinding process. In addition, the commutator film has caused great wear and tear due to long-term work. At run time a long time will appear overheating, noise and so on. Treatment: polish the main body to make it smooth, replace the commutator, and use lubricating oil regularly to reduce wear.
3, dc motor carbon brush and commutator of the friction sound: it is best to do an experiment in this aspect, the fine car dc motor is a very important process, but the specific process parameters and so on is to grope for.
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