来源：http://www.jnmcd.com 发布时间：2019-03-29 浏览：次
1. Wiring of DC motor
Parallel excitation is commonly used in power plants. The armature terminals of H1 and H2 parallel excitation windings are B1 and B2. Its connection mode is that H1 is connected with the positive pole of B1 DC power supply and H2 is connected with the negative pole of B2 DC power supply.
2. Reducing Start-up Current
In general, except for devices less than 4KW which can start directly, the starting current of all devices should be reduced to less than 2 times of the rated current of the motor. In order to reduce the starting current, the starting resistance should be connected in series to limit the starting current or reduce the starting voltage to limit the starting current when the motor starts. Because starting resistance is connected in series in armature circuit, the equipment is simple and economical, so it is widely used.
3. Coil Problem of DC Contactor
As for the DC contactor used in operation, its contactor coil should be able to operate for a long time. As for CZ0 series contactors, they all run for a short time, so the coils can not be burned when they are used for a long time. Therefore, after starting, a resistance of about 150 W, 1000 Omega should be added to the running contactors to avoid the coil burning accident.
4. Measurement of DC Current
As for its measurement, the shunt type is usually adopted. A 100A, 75mV shunt is connected in series in the main circuit. The positive and negative poles of the shunt are connected with a 0_100A ammeter of 75mv.
5. DC motor starting wiring principle wiring diagram with series resistance to reduce starting current.
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