1. Types of speed regulation
1. Field weakening speed regulation, changing the excitation current, increasing the voltage and reducing the speed.
2. Change the armature voltage, increase the voltage to increase the speed, and decrease the voltage to decrease the speed. This is widely used.
2. Principle
To make the armature receive electromagnetic torque in a constant direction, the key is:
When the coil sides are at magnetic poles of different polarities Next, how to change the direction of the current flowing through the coil in time, that is, perform the so-called "reversal". To this end, a device called a commutator must be added. The commutator and the brush can ensure that the current in the coil side of each pole is always in one direction, so that the motor can rotate continuously.
Extended information
Features
1. It can replace DC motor speed regulation, frequency converter + variable frequency motor speed regulation, asynchronous motor + reducer speed regulation;< /p>
2. It has the advantages of traditional DC motors, while eliminating the carbon brush and slip ring structures;
3. It can operate at low speed and high power, and can directly drive large motors without the need for a reducer. load;
4. Small size, light weight, large output;
5. Excellent torque characteristics, good medium and low speed torque performance, large starting torque and low starting current ;
6. Stepless speed regulation, wide speed range, and strong overload capacity;
7. Soft start, soft stop, and good braking characteristics, which can save the original machinery. Braking or electromagnetic braking device;
8. High efficiency, the motor itself has no excitation loss and carbon brush loss, eliminating multi-stage deceleration loss, and the comprehensive power saving rate can reach 20% to 60%.
9. High reliability, good stability, strong adaptability, and simple repair and maintenance;
10. Resistant to bumps and vibrations, low noise, small vibration, smooth operation, and long life. ;
11. Does not produce sparks, is particularly suitable for explosive places, and has explosion-proof type;
12. Trapezoidal wave magnetic field motor and sine wave magnetic field motor can be selected as needed.
Baidu Encyclopedia - DC motor speed regulation
Baidu Encyclopedia - DC brushless motor