How To Judge The Advantages And Disadvantages Of Fan Motor? Are Power And Efficiency Considered?

Fan motor test system is suitable for single-phase fan motor, EC fan motor, DC fan motor, AC fan motor electrical performance comprehensive test, one clamping can quickly complete the detection of preset items, the use of customized chemical design and test scheme, widely used in the fan industry.

What Is The Power Factor OF The Motor?

The power factor of an asynchronous motor is the product of measured asynchronous motor inputs, i.e. power is equal to three times the phase current and phase voltage. The value of the actual power ratio consumed is the ratio between the input power P1 and the apparent power S

The power factor of the motor changes during operation. The variation is related to the load size. The current of the stator winding is basically the no-power current of the rotating magnetic field. At this point the power factor is about 0.2. When the motor belt load is running, the power component of the output mechanical power stator winding current increases. The power factor has also increased. When the motor is running at rated load, the power factor is generally 0.7≤0.9. Therefore, the motor should avoid no-load operation to prevent large horses.

What Is The Input Power And Output Power OF The Motor?

The power absorbed from the power supply is called the input power of the motor, the mechanical power output on the motor shaft is called the output power, and at the rated load, P2 is the rated power Pn.

There is always a certain power loss during the operation of the motor, including copper (aluminum) loss on the winding core and various mechanical losses. Therefore, the input power is equal to the sum of the loss power and the output power, that is, the output power is less than the input power

What Is The Efficiency OF The Motor?

The amount of power loss in the motor is called the efficiency of the motor. The ratio between the output power and the input power is called the efficiency of the motor. The symbol is an ordinary percentage.

High efficiency means low loss and energy saving, but too high efficiency requirements will increase the cost of the motor. Generally, the efficiency of asynchronous motors under rated load is 75%≤92%, and the efficiency of asynchronous motors also varies with the size of the load... No-load efficiency is zero load, the load is 0.7 times of the rated load, and the efficiency is the highest.

At the end of the explanation of the noun, returning to the motor energy consumption just introduced, as the end user, you must pay attention to the efficiency of the motor used on the fan, which is also part of the efficiency of the fan itself. Generally, the smaller the motor power, the lower the efficiency, and the efficiency of each motor is related to the load point of the fan. For a constant speed fan, if the fan is properly designed, the maximum efficiency point of the motor is the constant speed operating power designed at the working pressure.

But for the transmission fan, as long as you use an asynchronous motor, whether it is variable voltage speed regulation or variable frequency speed regulation, the efficiency is very low. This is also the future permanent magnet synchronous motor to solve the problem of energy consumption,

The power factor is related to no power because the current power distribution system of the power unit has a power factor compensation system of a certain capacity. Under normal circumstances, it will not pay electricity for this part of the power, so it is not a success

If you are interested in the relationship between the power factor and the electricity bill, you can also introduce them separately, simply put, if you install a separate meter to record the electricity consumption, this part of the non-power meter will not be recorded by the meter and the meter will only record the power consumed by the fan.

Finally, a summary. The energy consumption of the motor mainly depends on the efficiency of the motor itself (the motor efficiency is a comprehensive reflection of the motor design material manufacturing and quality) and the working point with the fan. Even though the motor is highly efficient, the drive motor is very low when used at low power points.

For users, if there is no authoritative fan test data to prove the actual energy consumption of the fan, the best way is to install a meter to see how much electricity the fan needs. Source: Modern agricultural fan and ventilation technology