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Cross flow fan

Cross flow fan consists of motor, impeller(wheel) and housing. The impeller is produced a whole by the plastic injection or the aluminum alloy pressure casting,  including multi-leaf, long cylindrical with forward multi-wing blades.

Its operating principle as follows:

When the impeller rotates, the airflow enters the cascade from the open end of the impeller, passing through the interior of the impeller, and is discharged into the volute from the other side of the cascade to form a working airflow. The flow of the airflow in the impeller is complex, while the speed field of the airflow is unsteady. There is a vortex in the impeller, centered near the volute tongue. The existence of the vortex causes a circulating flow at the output end of the impeller. Outside the vortex, the flow line of the airflow in the impeller is arc-shaped. Therefore, the flow velocity at each point on the outer circumference of the impeller is inconsistent. The closer to the vortex core, the greater the velocity, and the closer to the volute, the smaller the velocity. The airflow speed and pressure at the fan outlet are not uniform, so the flow and pressure coefficient of the fan are average. The position of the vortex has a great influence on the performance of the cross-flow fan. The center of the vortex is close to the inner circumference of the impeller and close to the volute tongue. The performance of the fan is good. While the center of the vortex is far away from the vortex, the area of the circulating flow is increased, so efficiency of the fan is reduced.

A stepper motor is a control motor that converts an electrical pulse signal into a mechanical angular displacement. The so-called electric pulse, similar to the pulse, feels like the high level of the pulse when the pulse is beating, and the low level when it is not jumping. This is the electric pulse signal. The angular displacement unit is radians.

Stepper motors can be divided into reactive, permanent magnet, and hybrid. Each has its own advantages, and it is selected according to actual needs. The step angle of the reaction type is small and the precision is high; the permanent magnet type has a large torque. The hybrid type has the characteristics of high precision and large torque, but the cost is high. The structure and working principle of the stepping motor will be described below by taking the reaction formula as an example. The stepper motor is mainly composed of two parts:

a stator and a rotor. The stator and rotor are no strangers after learning DC motors. However, the stepping motor takes three-phase as an example, and has six or four magnetic poles on the stator and the rotor, respectively.

The shaded-pole motor is the original type of AC single-phase induction motor, dating back to at least as early as 1890. A shaded-pole motor is a small squirrel-cage motor in which the auxiliary winding is composed of a copper ring or bar surrounding a portion of each pole. This auxiliary single-turn winding is called a shading coil. Currents induced in this coil by the magnetic field create a second electrical phase by delaying the phase of magnetic flux change for that pole (a shaded pole) enough to provide a 2-phase rotating magnetic field. The direction of rotation is from the unshaded side to the shaded (ring) side of the pole.[2] Since the phase angle between the shaded and unshaded sections is small, shaded-pole motors produce only a small starting torque relative to torque at full speed. Shaded-pole motors of the asymmetrical type shown are only reversible by disassembly and flipping over the stator, though some similar looking motors have small, switch-shortable auxiliary windings of thin wire instead of thick copper bars and can reverse electrically. Another method of electrical reversing involves four coils (two pairs of identical coils).[3]

The common, asymmetrical form of these motors (pictured) has only one winding, with no capacitor or starting windings/starting switch, making them economical and reliable. Larger and more modern types may have multiple physical windings, though electrically only one, and a capacitor may be used. Because their starting torque is low, they are best suited to driving fans or other loads that are easily started. They may have multiple taps near one electrical end of the winding, which provides variable speed and power by selection of one tap at a time, as in ceiling fans. Moreover, they are compatible with TRIAC-based variable-speed controls, which often are used with fans. They are built in power sizes up to about ¹⁄₄ horsepower (190 W) output. Above ¹⁄₃ horsepower (250 W), they are not common, and for larger motors, other designs offer better characteristics.

At present, adapted singel phase motor, three phase motor and all kinds of fan motor belong to asynchronous motor. It often appears conditions that motor working temp increase even can not work when operating electrical motor.

It results from below reasons:

1. The main factor is power supply

   Too high Supply voltage, too low supply voltage,asymmetric supply voltage, unbalance of three phase power supply.

2. Motor load cause overheat of electric motor

   Operated motor is over-load. The dragging mechanical load is not working properly. The dragging machine is out of work.

3. Electric motor itself cause overheat.

   Electric motor winding is open circuit. Electric motor winding is short circuit. Motor circuit is connected wrong. Electric motor appears mechcanical breakdown

4. Worse ventilation and heat dissipation

   Too high ambient temp may increase inlet air. Air intake has impurity and don't make air inlet smoothy, finally inlet airflow is samll.

   Too many dusts is in the motor and influence motor dissipation. Unreasonable fan mounting cause no aiflow and little airflow.

   Wind Hood is not installed or windshield board is not installed in the end cover of the motor, resulting in the motor without a certain wind path
   

Five main trend application condition For Brushless DC motor

 

Micro motor market in China is developing more and more fast in rencent years. Instead of DC motor, Brushless DC motor features a great advantages of high efficiency and low noise with high market share,especially in export market.

Brushless DC motor is mainly used in condition as follows:

1. Brushless DC motor for industrial equipment

High efficiency, precision and performance for equipment is requested in industrial application reaching to quick and highly efficient work. To control speed and find exact position, some light industry prefer to choose this motor.

2. Brushless DC motor for automobile industry

With a trending of energy-saving and environmental protection from atoumobile industry, permanent magnet motor within Brushless motor is widely used in this field.

3. Brushless DC motor for medical apparatus

With the improvement of life quality and development of domestic medical level, Brushless DC motor can rescue hidden trouble from medical process, such as noise, brush etc.

4. Brushless DC motor for Household appliances

Traditional compressor motor is mainly used in air condition and refrigerators. Due to voltage and power, it result in low efficiency. Brushless DC motor coming has great influence on people life and improve human life quality, applying in table fan, vacuum cleaner, ain condition etc.

5. Brushless DC motor for electric car

Brushless DC motor starting magnetic motor integrate brushless dc starting motor with magnetic motor, saving reducer parts and improving operating reliability.

 

Cup, is a thing only pour tea, the value and role of cups will truly reflected. Culture of annatto, dewy tea cups to the tea ceremony.

The classification criteria of electric motors are as follows: according to the classification of working power, they can be divided into DC motors and AC motors; classified according to structure and working principle, they can be divided into synchronous motors and asynchronous motors. Synchronous motors generally include: permanent magnet motors, reluctance motors, hysteresis motors, etc.; asynchronous motors generally include: AC commutator motors and induction motors. According to the size of the power or the height of the stator core or the outer diameter of the stator core, it is generally divided into: large motor, medium motor, small motor and micro motor.

In the past ten years, due to the rapid increasing importance of energy conservation, environmental protection and sustainable development in the international community, the production of high-efficiency motors has become the development direction of the global motor industry. At present, the world's motor manufacturing industry is developing from general-purpose products to general-purpose and special-purpose products. High-efficiency, energy-saving, high-grade motors and mechatronics inverter motors will have good market prospects.

Through the analysis of the industrial layout of the motor industry, foreign motor companies outsourced the main components of their motor products to professional manufacturers for their manufacture, which promoted the development of domestic motor manufacturing enterprises and formation of a professional division of the motor filed. With the transfer of manufacturing bases to developing countries by foreign motor manufacturers, the output of China's motor manufacturing industry has increased year by year, the export volume has increased year by year, the grades of export products have been continuously improved, and some products with higher technical content have entered the international market.

According to the National Bureau of Statistics, as of June 2015, there were 2,685 enterprises in China's motor manufacturing industry with a total asset size of 724.48 billion yuan. As a basic energy conversion device, the motor has maintained steady and rapid growth in recent years.  

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