4-speed regulation methods of Roller Blinds Motor : 1. […]
4-speed regulation methods of Roller Blinds Motor :
1. When the armature voltage of the DC motor of the electric curtain decreases due to the speed adjustment, the armature circuit needs to have an adjustable DC power supply, and the resistance of the armature circuit and the excitation circuit is as small as possible. When the voltage is reduced, the speed of the DC motor of the electric curtain will also reduce.
2. The series resistance of the armature circuit of the DC motor controls the speed regulation. The larger the series resistance is, the weaker the mechanical characteristics and the more unstable the rotation speed. At low speed, the series resistance is large, the more energy is lost, and the lower the power. The speed regulation range is affected by the load, the load is large and the load is small and the load is light.
3. Weakening speed regulation, in order to prevent the magnetic circuit of the DC motor of the electric curtain from being too saturated, so the speed regulation can only be weak magnetic, not strong magnetic, the armature voltage of the DC motor is kept at the rated value, and the series resistance of the armature circuit is reduced to At the minimum, the excitation current and magnetic flux are reduced by increasing the excitation circuit resistance Rf so that the speed of the DC motor of the electric curtain increases and the mechanical characteristics become soft. When the speed rises, if the load torque is still rated, the motor power will exceed the rated power, and the motor will run with overload, which is not allowed. Therefore, when the field weakening speed is adjusted, the load torque will decrease correspondingly with the increase of the motor speed, which is a constant power speed regulation. In order to prevent the rotor winding of the motor from being removed and damaged due to excessive centrifugal force, when using a weak magnetic field for speed regulation, it should be noted that the speed of the DC motor does not exceed the allowable limit.
4. In the speed regulation system of the DC motor of the electric curtain, the easiest way is to complete the speed regulation by changing the resistance in the armature circuit. This method is the simplest and cheapest speed regulation method. For the electric curtain, speed regulation control is very practical.