What are the reasons for the widespread application of brushless DC motors.
With the improvement of production design and control level of DC brushless motors, they are more widely used in various fields.
From mechanical arm control in aerospace, gyroscope and servo drive, to oil pump control, electric controller, engine control production equipment, instruments and meters in the automotive industry. DC brushless motors can be seen in everyday household appliances such as vacuum cleaners, mixers, hair dryers, cameras, and home fans, as well as in office equipment drivers such as digital cameras, laser printers, copiers, fax machines, recorders, LD DVD players, and shredders.
So, why is the application field of brushless DC motors so wide?
It is inseparable from its excellent characteristics.
As a type of synchronous motor, brushless DC motor not only has a series of advantages such as simple structure, reliable operation, and easy maintenance of AC motor, but also has many advantages such as high operating efficiency and good speed regulation performance of DC motor.
The first major advantage of brushless DC motors is high efficiency.
Because DC brushless motors can continuously rotate at their maximum rotational force (torque). In contrast, brushed motors can only provide maximum torque at certain points of rotation. Although brushed motors can provide the same torque as DC brushless motors, brushed motors require greater magnetism, which means smaller sized DC brushless motors can provide considerable power.
The efficiency of a typical brushless DC motor can reach over 96%, while the efficiency of a traditional DC motor is generally around 75%; High efficiency leads to high energy conversion, and the conversion of electrical energy into the rotational mechanical energy of the motor is high, which is directly reflected in energy saving, saving 20% -60% of energy compared to traditional motors. If it is a motor that runs for a long time, using a DC brushless motor can save the electricity cost of one motor in one year, and the long-term cost-effectiveness is higher. Although the initial purchase price of DC brushless motors is higher than that of traditional motors, the energy-saving effect is very obvious.
Another major advantage of brushless DC motors is their long lifespan.
Traditional motors with brushes usually require replacement and frequent maintenance due to the wear and tear of carbon brushes, while DC brushless motors typically have a service life of over 20000 hours. Under normal operating conditions, they can be used for more than 5 years without damage, so the service life of DC brushless motors is five times that of traditional motors.
DC brushless motor operates with low noise.
Due to its simple structure and precise installation of spare parts, brushless DC motors operate smoothly with a sound level below 50db. Many medical devices use brushless DC motors due to their noise reduction performance. However, traditional motors require the replacement of carbon brushes, which cannot achieve sealing. The wear of carbon brushes also causes friction noise, and the noise is generally above 60db, which cannot meet the requirements of high noise equipment.
A brushless DC motor without a brush can provide high durability.
For brushed motors, the brush and commutator wear out due to continuous moving contact, and sparks may be generated during contact.
Especially these sparks are usually generated when the brush passes through the gap in the commutator, and strong sparks can cause electrical noise.
If electrical noise factors need to be considered in motor design, DC brushless motors are more desirable.
Without sliding contact, the problem of commutation sparks is solved, making it suitable for use in explosive environments.
