电磁噪声的对策

电磁噪声的对策(EMC)

在有刷电机转动的时候，由于整流器的切换会发生闪火花电流。这种闪火花可能会成为电子噪音，对控制电路造成不好影响。可以通过在电机盒上连接电容器来降低噪音。
(When a DC brush motor rotates, spark current occurs due to switching of the commutator. This spark may become electric noise and effect the control circuit. Such noise can be reduced by connecting a capacitor to the DC motor.)

• 为了降低电气异音，可在马达端子部位安装电容器和扼流圈，一般可有效消除火花电压的方法是在接近发生源的回转子部位进行安装，而这种
  方法的成本绩效也较高。
  (In order to reduce electrical noise, capacitor and choke can be installed at the terminal parts of the motor. The way to effectively eliminate the spark is to install it on the rotor that near the source, which is very costly)。

1. 可在马达内部安装消除异音的元件，如安装环形变阻器（D/V）、环形电容器、橡胶环形电阻（RRR）、晶片电容器的方法。
   ⇒高频率范围的异音有效果
   (Eliminating electrical noise inside the motor by installing Varistor (D/V), annular capacitor, rubber ring resistance (RRR) and chip
   capacitor that reduces the noise under high frequency)
2. 可在马达外部安装消除异音的元件，如外接电容器（电解类型、陶瓷类型）、扼流圈。 ⇒对低频率范围的异音有效果。
   (Eliminating electrical noise outside the motor by installing components like capacitor (electrolytic type, ceramic type) and choke
   that reduces noise under low frequency)

• 作为降低异音的对策方法，有1或2单独使用的，以及1与2并用的方法，1与2并用时的效果较大。
  (Method 1 and 2 could be used separately. The combination of these two methods will be the best noise reduction solution.)

配合图示说明(Illustration)：

备注(remark)：C=Capacitance,为电容；L=Inductance,为电感。