The opening and closing of smart electric curtains relies on the rotation of micro motors. Some electric curtain motors use AC motors, but with the development of science and technology, micro DC motors have been widely used in various types of electric curtain products. So what are the advantages of electric curtain DC motors? What are the common speed adjustment methods? Let’s talk about Xinda micromotor.

Electric curtains use a micro DC motor and gear reducer structure, which has the advantages of large torque and low speed. It can drive different types of curtains according to different reduction ratios. Common micro DC motors for electric curtains include carbon brush motors and brushless motors. Carbon brush DC motors The main advantages of motors are large starting torque, smooth operation, low cost, and convenient speed adjustment. Brushless DC motors have the advantages of long life and low noise, but the cost is too high and the control is complicated. Therefore, electric curtains using carbon brushes on the market are very popular. 

Various speed adjustment methods of electric curtain micro DC motors

1. When the armature voltage of the electric curtain DC motor decreases due to speed adjustment, the armature circuit needs to have an adjustable DC power supply. The resistance of the armature circuit and the excitation circuit should be as small as possible. When the voltage decreases, the speed of the electric curtain DC motor will also decrease. reduce.

2. The DC motor armature circuit is connected with a series resistance to control the speed. The larger the series resistance, the weaker the mechanical characteristics and the more unstable the speed. At low speeds, the series resistance is very large, the more energy is lost and the lower the power. The speed regulation range is affected by the load. Large load, small load and light load.

3. Field weakening speed regulation. In order to prevent the magnetic circuit of the electric curtain DC motor from being oversaturated, the speed regulation can only be weak magnetism and not strong magnetism. The armature voltage of the DC motor is maintained at the rated value and the series resistance of the armature circuit is reduced to Minimum, the excitation current and magnetic flux are reduced by increasing the excitation circuit resistance Rf, thereby increasing the speed of the electric curtain DC motor and softening the mechanical characteristics. When the speed increases, if the load torque is still rated, the motor power will exceed the rated power and the motor will run overloaded, which is not allowed. Therefore, when the field weakening speed is adjusted, the load torque will decrease accordingly as the motor speed increases, which is a kind of constant power speed regulation. In order to prevent the motor rotor winding from being dismantled and damaged due to excessive centrifugal force, when using a weak magnetic field to regulate speed, care should be taken that the DC motor speed does not exceed the allowable limit.

4. In the speed regulation system of electric curtain DC motor, the simplest method is to complete the speed regulation by changing the resistance in the armature circuit. This method is the simplest and low-cost speed regulation method. For electric curtain speed regulation control is very practical.

The above are the characteristics and speed adjustment methods of electric curtain DC motors.