Description:

Specification

2. Describtion

Some of the problems of the brushed DC motor are eliminated in the BLDC design. In this motor, the mechanical "rotating switch" or commutator is replaced by an external electronic switch synchronised to the rotor's position. BLDC motors are typically 85–90% efficient or more. Efficiency for a BLDC motor of up to 96.5% have been reported, whereas DC motors with brush gear are typically 75–80% efficient.

The BLDC motor's characteristic trapezoidal back-emf waveform is derived partly from the stator windings being evenly distributed, and partly from the placement of the rotor's PMs. Also known as electronically commutated DC or inside out DC motors, the stator windings of trapezoidal BLDC motors can be with single-phase, two-phase or three-phase and use hall effect sensors mounted on their windings for rotor position sensing and low cost closed-loop control of the electronic commutator.

BLDC motors are commonly used where precise speed control is necessary, as in computer disk drives or in video cassette recorders, the spindles within CD, CD-ROM (etc.) drives, and mechanisms within office products such as fans, laser printers and photocopiers.

A commutated DC motor has a set of rotating windings wound on an armature mounted on a rotating shaft. The shaft also carries the commutator, a long-lasting rotary electrical switch that periodically reverses the flow of current in the rotor windings as the shaft rotates. Thus, every brushed DC motor has AC flowing through its rotating windings. Current flows through one or more pairs of brushes that bear on the commutator; the brushes connect an external source of electric power to the rotating armature.

The rotating armature consists of one or more coils of wire wound around a laminated, magnetically "soft" ferromagnetic core. Current from the brushes flows through the commutator and one winding of the armature, making it a temporary magnet (an electromagnet). The magnetic field produced by the armature interacts with a stationary magnetic field produced by either PMs or another winding (a field coil), as part of the motor frame. The force between the two magnetic fields tends to rotate the motor shaft. The commutator switches power to the coils as the rotor turns, keeping the magnetic poles of the rotor from ever fully aligning with the magnetic poles of the stator field, so that the rotor never stops (like a compass needle does), but rather keeps rotating as long as power is applied.

Established in 1995, Changzhou Yufeng Vehicle Co.,Ltd is one of the largest electro-tricycle in China, covering more than 58000 square meters area with more than 50 technologists. Moreover, we mainly manufacture different electro-leisure vehicle for senior citizens, tricycle for sightseeing, small size electro-tricycle, transformer, motor, high-intensity synthesized car body, metal car body, glass fiber reinforced plastic car body and plastic parts of whole car depending on excellent equipment, advanced technique, strict quality management and a complete set of checkout methods.

Competitive Advantage:

1. We have our professional factory and produces many kinds of tricycles ourselves. This makes sure that we can guarantee quality, and technical excellence, which won a good reputation among our customers all over the world.

2. Strong supply ability, creative design apartment, high-tech skills and advanced equipment can surely meet every customer’s requirement.

3. We have professional service-team that helps customers to solve all kinds of problems in all processes of the transaction, installation and promotion.

4. Excellent after-sales service.

5. Certain discount will be given to customers that have established long term business relationship with us.

After-sale service

We provide after-sale spare parts. In addition, we need damage parts back to our company. We have office that set foreign countries.