Brushless DC motors are the trend of the future application market and have been widely used at home and abroad on a large scale. High efficiency and energy saving is incomparable with AC motors. The motor adopts all-copper winding, according to the actual application needs, choose aluminum shell or iron shell. The driver adopts imported chips, with stable performance and avant-garde solutions. All parameters are better than domestic chips, making the motor more efficient, flexible and changeable.
The motor body of the permanent magnet brushless DC motor consists of a stator assembly and a rotor assembly. The stator assembly is mainly composed of a magnetically conductive stator core and a conductive armature winding. The armature (stator) winding can be connected in star or angular (or closed) connection. When the windings are star-connected, the inverter can use either a bridge circuit or a half-bridge circuit; when the windings are angularly connected, the inverter can only use a bridge circuit.
The rotor is the part that generates the exciting magnetic field of the permanent magnet brushless DC motor. It consists of permanent magnets, magnetic conductors and supporting parts. There are three commonly used structural forms: the outer circumference of the rotor iron core is pasted with tile-shaped permanent magnets, and the rotor iron core is embedded in the A permanent magnet ring is integrally bonded on the rectangular plate-shaped permanent magnet and the outer casing of the rotor iron core. In order to obtain the trapezoidal wave induced electromotive force with a wide enough flat top part, the rotor often adopts a surface type and embedded structure, the rotor magnet is tile-shaped, and the radial magnetization method is adopted. It is difficult for the built-in rotor to generate trapezoidal wave induced electromotive force, which is generally not used in brushless DC motors.
The permanent magnet brushless DC motor rotor is in the form of eliminating brushes and mechanical commutators. In the brushless DC motor, the motor is installed in reverse, that is, the permanent magnet poles are placed on the rotor, and the armature winding is the stator winding. The direction of the current can alternate with the polarity of the magnetic field on its coil sides. It is necessary to connect the stator winding to the inverter, and install a rotor position detector to detect the spatial position of the rotor magnetic pole, and control the on-off of the power switching device in the inverter according to the rotor spatial position, so as to control the conduction of the armature winding. The position detector and inverter act as “electronic commutators”.
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Contact: Lukim Liu
Tel: 18606382728 (wechat/whatsapp)