18 What is the current rating of a 5 kW motor?

The rated current of the 4-pole kilowatt motor is about.

Meaning: The rated current refers to the current when the electrical equipment is running at the rated voltage and according to the rated power. It can also be defined as the current at which electrical equipment can work continuously for a long time under rated environmental conditions (ambient temperature, sunlight, altitude, installation conditions, etc.).

The current of the appliance should not exceed its rated current when it is working normally.

Properties: 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 when the rated capacity of the three-phase does not exceed 100 MVA (the single-phase does not exceed MVA), it can withstand the occasional overload of the load rate (load current rated current) is not greater, and the occasional overload of the load rate is not more than when the capacity is larger.

The casing should also have a corresponding overload capacity, and the winding hot spot temperature and top oil temperature should not exceed 140 and 105 respectively.

.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.

In the case of 380V, the rated current is about 15A, the starting current is 4-7 times of the rated current, and the no-load current in normal use is about 30-50% of the rated current.

The no-load current is about 30-50% of the rated current. In engineering practice, the current of three-phase asynchronous motors below 45kw is generally close to such a formula: power px2 = rated current.

This is an approximate calculation. No-load currents generally do not need to be considered in engineering practice. Therefore, the rated current of the kilowatt motor is about 15A.

adverse effects. The starting current of the motor is 5 7 times of its rated current, although it is such a large starting current, but in the general situation because the starting time of the motor is not very long, the starting time of the motor is at most a few seconds to more than ten seconds, the large current that the motor flows in a short time, the temperature rise caused by the heating of the motor is not too high The motor is able to withstand it.

The above content reference: Encyclopedia - Starting current.

The 75 kW electric motor has a current of 134A.

According to the power formula p=have:(Calculated with three-phase mains, the power factor is taken as i=p (.)

A 134A motor is a device that converts electrical energy into mechanical energy. It uses an energized coil (that is, the stator winding) to generate a rotating magnetic field and acts on the rotor (such as a squirrel cage closed aluminum frame) to form a magnetoelectric dynamic rotational torque. The motor is divided into DC motor and AC motor according to the different power sources, and most of the motors in the power system are AC motors, which can be synchronous motors or asynchronous motors (the magnetic field speed of the stator of the motor is not synchronized with the rotation speed of the rotor).

The motor is mainly composed of a stator and a rotor, and the direction of the energized wire in the magnetic field is related to the direction of the current and the direction of the magnetic inductance line (magnetic field direction). The working principle of the motor is the effect of the magnetic field on the current force, which makes the motor rotate.

150（a）。Brother.

Here's how the current rating for a 75 kW motor is calculated:

i=p/(√3*v*cosφ)=75/(√3*。

The rated current is calculated by the following formula: rated current = rated power rated voltage (i = p u).

The current of the electrical equipment when the rated voltage is operated according to the rated power. It can also be defined as the current at which electrical equipment can work continuously for a long time under rated environmental conditions (ambient temperature, sunshine, altitude, installation conditions, etc.). The current of the appliance should not exceed its rated current when it is working normally.

75kw asynchronous motor, rated current about 140A.

times in between.

The maximum working current of the motor is the working current of the motor can be talked about for a long time, which can reach about times of the rated current, and the motor selection is small due to improper calculation of the design power, but the motor can continue to work in the case of exceeding the rated power slag tung, the working current at this time is the maximum working current, and the starting current of the motor = stalled rotor current = maximum current.

The three-phase motor current is about 150A.

Three-phase trapped leakage motor: i p ( 3ucos ) = voltage power factor);

Single-phase motor: I p (UCOS) = state Xun voltage power due to the number of bad numbers) According to experience, the current of three-phase motor per kW power is about 2A.

150（a）。

Below is the current rating of the motor at 75 kW.

Calculation: i=p ( 3*v*cos )=75 ( 3*.

The rated current is calculated by the following formula: rated current = rated power.

Rated voltage (i=p u).

The rated current of the three-phase motor is the line current of the motor power supply inlet line, for the star connection of the motor, the line current is equal to the phase current, for the triangle connection.

The line current is equal to 3 times the phase current of the root number.

The rated current is determined by the rated capacity of the windings.

The current flowing through the winding line end is calculated by dividing by the rated voltage of the winding and the corresponding factor (1 for single phase and 3 for three phase). If the winding is triangular, the rated current of the winding is based on the line current as the numerator and 3 as the denominator.

For example, if the line current is 500A, then the rated current of the winding is (500 3)A.

The rated current of the 75 kW motor is about 140A.