18 What is the motor power of 5KW current?

.The current of the 5kw motor is about 37A, and its rated current refers to the current that occurs when the electrical equipment is running at the rated voltage, indicating that the electrical facilities can work continuously for a long time under the conditions of rated environment, temperature, sunshine and installation, and during normal operation, the current of the electrical appliance can not exceed its rated current

2. What to pay attention to when using a small motor.

Before disassembly, use compressed air to blow off some dust on the surface of the motor and remove some dirt on the surface. When choosing a work site where the motor is dismantled, it is also necessary to clean the site environment. At the same time, it is also necessary to be familiar with the structural characteristics and maintenance technical requirements of the motor.

The rated current of the three-phase 380V motor with power is.

Around 35A (depending on the number of poles and the connection method).

The motor is connected to the 380V power supply, and the current of the motor should be around 36A.

According to the calculation of 380 volt three-phase asynchronous motor, the rated current of 2-pole, 4-pole, 6-pole, 8-pole and other motors is different, and the current of the 4-pole motor is about 37A. The higher the number of poles, the slightly higher the current.

It should be a three-phase motor, with a current of 28A

Taking the Y series three-phase 4-pole asynchronous motor as an example, its rated current is about 39A.

In principle, the motor uses 8 hours of electricity, but in fact it will be more, and such a large power motor will definitely use a magnet switch, which consumes electricity, so it should be greater than the kilowatt-hour of electricity.

Electric machinery (commonly known as "motor") refers to an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction.

The motor is represented by the letter M in the circuit (the old standard is D), its main role is to generate driving torque, as the power source of electrical appliances or various machinery, the generator is represented by the letter G in the circuit, and its main role is to use mechanical energy to convert into electrical energy.

The voltage has to be given in order to calculate the current. p=ui

The calculation formula of three-phase motor is: i=p, 15000 is approximately equal to, generally we calculate by 32a (is the root number of 3, respectively, power factor and efficiency).

Motor formula: i = p u then the motor current of 380v is equal to i = 15000, (is the root number of 3 power factor and efficiency are calculated respectively), if it is a 220v motor multiplied by, 380v motor starting current is times respectively, according to the motor is 15kw, to use a star delta starter, then the current of 1 3 is about 12 amps.

1. Single-phase: I=P (U*CosFi).

Note: i--is the single-phase motor current

p--- is the single-phase motor power. where u=, cosfi=

2. Three-phase: i=p (

Note: i--is the current of the three-phase motor

p--- is the power of the three-phase motor. where u=, cosfi=

3. The rated current of the three-phase motor refers to the line current of the motor power supply introduction line, for the motor with star connection, the line current is equal to the phase current, and for the motor with the triangle connection, the line current is equal to the phase current of 3 times the root number.

4. Calculation formula of rated current: IE=P (3U* *COS).

p - the rated power of the motor.

U - motor line voltage.

Efficiency of the motor at full load.

COS – the power factor of the motor when it is fully loaded.

The rated current is calculated by dividing the rated capacity of the winding by the rated voltage of the winding and the corresponding coefficient (1 for single phase and 3 for three phase). Therefore, the rated current of the transformer is the rated current of each winding, which refers to the wire current. However, if the single-phase transformer that forms a three-phase group, if the winding is triangular connection, the rated current of the winding is expressed by the line current as the numerator and 3 as the denominator, for example, the line current is 500A, then the rated current of the winding is (500 3) A.

When the transformer is operating at the rated capacity, the current of the windings is the rated current. Referring to the national standard GB T151641-1994 "Load Guidelines for Oil-immersed Power Transformers", the transformer can be overloaded, and the rated capacity of the three-phase does not exceed 100MVA (when the single-phase does not exceed, the load rate (load current rated current) is not greater than the occasional overload, and the load factor can not exceed the occasional overload when the capacity is larger.

The rated current of the three-phase motor refers to the line current of the motor power supply introduction line, for the motor with star connection, the line current is equal to the phase current, and for the motor with triangle connection, the line current is equal to the phase current of 3 times the root number.

The current of the motor is about 37A.

Motor, rated current of 37A, the motor generally uses step-down start, you can use 40A to 60A AC contactor, if it is a direct start, you need to use 100A AC contactor, the nominal voltage and current of the general motor are line voltage and line current.

Its rated current refers to the current that occurs when the electrical equipment is running at the rated voltage, indicating that the electrical facilities can work continuously for a long time under the conditions of rated environment, temperature, sunshine and installation, and during normal operation, the current of the electrical appliance cannot exceed its rated current, and the current of the electrical equipment when it is working normally should not exceed its rated current.

The rated current of the three-phase kW motor is about 37A, which is related to the power factor and electromechanical conversion efficiency, the concept of the rated current of the three-phase motor is that the rated voltage is 380V, and the load power is the current of the motor when the load power is the current, for the speed-regulating motor, the maximum current at full speed is the rated current value.

The method of calculating the current

Because the principle of the cable is to calculate the calculated current according to the calculated power to select the cable, we do not need to consider the starting mode of the motor when selecting the cable; According to the formula of power calculation P= 3UICOS, the calculated current is i=p 3UCOS, where the power P is, the voltage U is 380V, COS is the power factor, the general motor is left and right, we take.

Calculate current i=p 3ucos =18500w (; Then the second method is used to test whether the calculation is correct, and the second method is the empirical method commonly used by electricians: under three-phase electricity, every 1kw of power needs 2A of current, so that is to say, the current required by the motor is.

We compare the currents obtained twice and find that they are basically the same, so we choose the calculated current of the 37A action motor for the sake of conservatism.

The above content is referred to: Encyclopedia - Current Calculation.

The current of the electric machine depends on the power factor and voltage of the motor. The power banquet rate factor of the motor is generally, the voltage is generally 220V, because of the hail, the current of the motor is 18A, that is: current = power voltage power factor =.

Hello! We're happy to answer for you! The reasons why the motor current has 18A are:

To calculate the current magnitude of a motor, it is necessary to know its rated power and rated voltage, which in this case is and 400V. According to the formula i=p (3 * u * cos), where p is the power, u is the voltage, and cos is the power factor, the current size of the motor in the rated state can be about about that. However, this is only the current value of the motor under rated operating conditions, not the only current value.

When the motor starts, the starting current of the motor will be relatively large, and may exceed 5 times the rated current. In addition, under special circumstances such as load changes and voltage fluctuations, the current of the motor will also change. All things considered, if you see that the current of the motor is 18A, it is usually because the motor is starting or working under heavy load.

It is important to note that the high current generated during motor start-up poses a potential risk to system stability and equipment life, so appropriate control and protection measures need to be taken.