Although most of the motors in the market are AC motors, this is due to the simple structure of AC motors, coupled with the rapid development of AC frequency conversion technology in recent years, which has made the control of AC motors very convenient and has been widely used. This has also led many people to criticize DC motors. However, DC motors are very useful in certain specific fields, so how to choose a DC motor?
Select the motor according to the usage environment
1. DC motors for new energy vehicles: According to information, although most of the vehicle motors are AC motors, there are also a small number of DC motors. The installed capacity of brushless/permanent magnet DC motors was 2000 in 2016, accounting for only 1%. However, due to the good speed regulation performance of DC motors, uniform and smooth stepless speed regulation can be achieved under certain load conditions, resulting in a wide speed regulation range and large starting torque. Therefore, there are still a few applications in the field of new energy, and the installed capacity is mostly used for large vehicles such as buses.
2. DC motors are widely used in the rechargeable electric tool industry due to the widespread use of rechargeable tools. Recently, the development of brushless DC motors has risen rapidly. The common and widely used ones are still brushless DC motors.
3. Choosing DC motors in the children's toy industry
Tianliang children's toys, considering safety, convenience, and portability, are widely and extensively used with DC motors.
4. Application of DC motors in the shipbuilding industry
5. Selecting DC motors in household appliances
Selection of Brushless and Brushless Motors
Brushless motors are explosion-proof due to their lack of sparks. Can be used in situations where there is corrosion to the brushes; Of course, electric bicycle motors are also used in general places, as they have a long lifespan and less interference, and are widely used in many places. Perhaps slightly worse in terms of startup, requiring auxiliary circuits. Brushless motor with sparks, not explosion-proof, prone to wear and tear on the brush part, no electronic circuit, simple connection. Series excitation can be used for both AC and DC, which was widely used in the early days and is widely used in the electric tool industry. Brushless motors have developed rapidly and have replaced brushed motors in many places.
Select based on type
Choose the correct type of DC motor based on the characteristics of the load and the application location. Machinery that requires a constant speed should use parallel excited motors, while lifting and transportation machinery should use series excited DC motors. If used outdoors, a DC motor with wind, sand, and rain resistance should be used. If used in mines, DC motors with explosion-proof performance should be used.
Choose the power of the motor based on the size of the load
The rated power of the first flow motor is generally slightly higher than the power of the load to avoid overload of the DC motor, but the load should not be too small to avoid waste.
Selection of DC Motor Speed
The speed of a DC motor should be selected correctly based on the load speed. The principle of selection is that both the DC motor and the load operate at the rated speed.
About Electromagnetic Motors and Permanent Magnet Motors
The so-called electromagnetic motor refers to a motor with an excitation winding placed in the stator slot, and the stator magnetic field is generated by the excitation winding passing the power current.
The so-called permanent magnet motor refers to a permanent magnet stator without embedded excitation winding, and the stator magnetic field is generated by the permanent magnet.