Brushless DC motors have the characteristics of energy saving, long life, low noise, small size and light weight.
Japan Denco is one of the world's leading high-performance motor developers and manufacturers.
Although the brush motor has the advantages of high efficiency, miniaturization, power drive, and low production cost, it also has problems such as brush friction noise, sparks, electronic interference, and shortened motor service life due to brush wear. In order to solve these problems, brushless DC motors came into being.
The brushless DC motor uses the magnetic force of the stator coil circuit to drive the rotor of a permanent magnet, and the current switching that was previously achieved by using the brushes and commutators of the brushed DC motor is realized through sensors and electronic circuits. Thanks to the development of peripheral technologies such as semiconductors, brushless DC motors are the first motors to realize this function, and they have the characteristics of DC motors in the point that current is proportional to torque, voltage and rotational speed, and the characteristics of AC motors in structure, combining the advantages of both. Brushless DC motors have the advantages of small size, large output power, long life, no sparks and interference, etc., and have a wide range of uses.
Characteristics and types of brushless DC motors
"Magnet rotation" is the most significant feature of brushless DC motors
The magnetic field generated by the current in the stator coil is used to rotate the magnet-bearing rotor. The switching of the current is controlled by sensors and integrated circuits.
External rotor type (the rotating part is outside the stator)
merit
Strong torque can be obtained
The rotational speed is stable when rotating at a fixed speed
insufficient
Large rotor volume (low sensitivity)
Since the rotating part is located on the outside of the stator, safety measures need to be considered
Internal rotor type (the rotating part is inside the stator)
merit
The rotor is small in size and highly sensitive
The coil is located on the outside of the rotor and has good heat dissipation performance
insufficient
It is difficult to get strong torque
The magnet is damaged by centrifugal force
Comparison table of specifications of various types of motors
Brushless DC motors have many technical advantages
Compared with other types of motors, brushless DC motors have many technical advantages, such as miniaturization/high power, low vibration/low noise, and long service life.
All kinds of small brushless DC motors produced by Japan Densan have absolute advantages in any industrial field, such as 80% of the global market share in the spindle motor industry for hard disk drives (HDD); It has a 60% global market share in the DVD and other optical drive motors industry. It has a 40% global market share in the fan motor industry. All along, Japan Denco has always focused on the industry in the field where brushless small motors are growing the fastest, and is the first to start mass production of brushless DC motors ahead of other peer companies, and finally established its position as a leading enterprise in the industry. In addition, Japan Denco has applied FDB (Liquid Bearing) technology to HDD spindle motors at the fastest speed, meeting the market demand for precision HDDs, and continuously introducing new technologies through self-developed design tools and simulation tools, maintaining a leading position in the motor industry.
Today, the first automotive motor market is the fastest-growing in the field of brushless DC motor applications. In the same way that the conventional shift from hydraulic to electric steering can save 3 to 5% of fuel, more and more components are being replaced by motors as the energy saving effect of electrification technology becomes more apparent. Among them, motors are also becoming dominant in some functions that require high control performance and components that must have a long service life due to frequent use. In addition to electric steering for automobiles, motors are also used in air conditioning compressors, and are expected to be used as drive motors in the electric vehicle industry in the future. To this end, it is necessary to convert the limited amount of electricity into optimal kinetic energy and develop small motors that can be installed in a small space. We will make full use of our long-standing experience in precision compact motors to become the world's leading manufacturer of automotive motors.
As a new application field of brushless DC motors, the market for automotive motors is expanding.
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