Brushless motor
Brushless motors have electric contacts in place of mechanical contacts such as a commutator and brushes. Brushless motors are used abundantly in various industrial fields in recent years because of the advantage that they do not have any mechanical contact point like between the brush and the commutator and therefore they are free from various problems, such as wear of a brush and electric noises. The brushless motor comprises a commutation system that electromagnetically detects a rotation of a rotor and switches application of a current to magnetic coils, instead of a mechanical commutation system that comprises a mechanical brush and a commutator. Thus, the brushless motor, compared with the motor provided with the mechanical commutation system, has advantages of a reduction of a noise resulting from the rotation and a high durability. A brushless motor generally includes a rotor having a shaft with a permanent magnet affixed thereto. The brushless motor may also include a stator having a hollow cylinder with ball bearing mounted on an interior portion of the cylinder to rotatably support the rotor shaft. The stator may also include induction coil windings mounted on the case of the motor or interleaved with laminated iron rings. A brushless permanent magnet motor comprises a rotor supporting a plurality of magnetic elements adapted to rotate concentrically within a stator comprising a plurality of coil windings. The motor can be driven by energising one of the coils to attract the rotor magnets whilst energising another of the coils to repel the magnets. To cause the motor to rotate continuously, the currents flowing through the coils must be switched with rotor position. This switching is known as commutation. The three-phase brushless motor is a kind of motor apparatus with high power efficiency; moreover, the volume thereof can be reduced more easily than that of other kinds of motor. A brushless DC motor makes use of control circuitry to operate switches that replace the combination of brushes and electrical contacts on the commutator. The elimination of the brushes and commutator reduces maintenance, as there is no wear on an associated brush, and prevents arcing in the motor that can occur as the commutator moves past the brushes. Therefore, the DC brushless motor is well suited to every kind of 3C production and is now in widespread use.
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