There is a difference in power, so what is power?Power is the amount of work done per unit of time or the amount of power converted into energy.If the work done over time, the average power over time is given by the following formula: Instantaneous power is the average power over time as time approaches 0.Power is a physical quantity that denotes the degree of speed at which work is done.The ratio of work to the time it takes to do work is called power, and it is numerically equal to the work done in unit time, expressed in terms of P.If the work dA is done within the time interval dt, then the power is the scalar product of the acting force and the velocity of the force point of the object.Power measurement is used to measure the power consumed by electrical equipment. It is widely used in the research and development of household appliances, lighting equipment, industrial machinery and other fields, such as production line. Power motor is the most typical core.
The power of the motor should be selected according to the power required by the production machinery, so that the motor can run under rated load as far as possible.The following two points should be paid attention to when choosing:
If the motor power is too small.There will be a "small horse cart" phenomenon, resulting in long-term motor overload.The insulation is damaged by heat.Even the motors were burned.
If the motor power is too large.There will be a "big horse-drawn cart" phenomenon.Its output mechanical power can not be fully utilized, the power factor and efficiency are not high, not only to the detriment of users and the power grid.It also wastes electricity.To correctly select the power of the motor, the following calculation or comparison must be made: P=F*V/1000(P= calculated power KW, F= required tension N, working machine linear speed M/S) in the continuous working mode of constant load, the required power of the motor can be calculated according to the following formula: P1(KW) : P=P/ N1n2 n1 is the efficiency of the production machine;N2 is the efficiency of the motor, that is, the transmission efficiency.The power P1 obtained by the above formula may not be the same as the product power.So.The rated power of the selected motor shall be equal to or slightly greater than the calculated power.
