Dc motor speed control method of sharing controller

In dc motor controller in the process of running, sometimes the need for speed, then you know it has several speed regulating methods? 1. Armature resistance speed: different types of dc motor controller can be this way. When the load reaches a certain standard, due to resistance of the dc motor controller, the armature loop total resistance increases, thus reduce speed appears. 2. Change the armature voltage control: voltage there are two ways: one is to use change voltage; The second is to use the thyristor inverter power supply control system. 3. Change the field current speed: when the armature voltage constant, choose field current to achieve speed control. Above is the dc motor speed control method of the controller, hope to help you.