factory Outlets for XJM7-J Measuring box (Infrastructure Energy Measurement Box) for Nepal Factory


Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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XJM7-J metering box (infrastructure power metering box) is suitable in power supply system with AC 50HZ, rated voltage 380 / 220V , as the power measurement in construction site.


Meet GB7251.1-1997 and GB7251.3-1997 standards.

3C certificate:

XJM7-J Mgy Measurement Box)-2

3 phase induction motor-3 phase induction motor construction and working-https://www.electrical4u.com/working-principle-of-three-phase-induction-motor/
Three-phase induction motors are the most common and frequently encountered machines in industry
simple design, rugged, low-price, easy maintenance
wide range of power ratings: fractional horsepower to 10 MW
run essentially as constant speed from no-load to full load
Its speed depends on the frequency of the power source
not easy to have variable speed control
requires a variable-frequency power-electronic drive for optimal speed control
An induction motor has two main parts
a stationary stator
consisting of a steel frame that supports a hollow, cylindrical core
core, constructed from stacked laminations (why?), having a number of evenly spaced slots, providing the space for the stator winding
a revolving rotor
composed of punched laminations, stacked to create a series of rotor slots, providing space for the rotor winding
one of two types of rotor windings
conventional 3-phase windings made of insulated wire (wound-rotor) » similar to the winding on the stator
aluminum bus bars shorted together at the ends by two aluminum rings, forming a squirrel-cage shaped circuit (squirrel-cage)
Two basic design types depending on the rotor design
squirrel-cage: conducting bars laid into slots and shorted at both ends by shorting rings.
wound-rotor: complete set of three-phase windings exactly as the stator. Usually Y-connected, the ends of the three rotor wires are connected to 3 slip rings on the rotor shaft. In this way, the rotor circuit is accessible.
This rotating magnetic field cuts the rotor windings and produces an induced voltage in the rotor windings
Due to the fact that the rotor windings are short circuited, for both squirrel cage and wound-rotor, and induced current flows in the rotor windings
The rotor current produces another magnetic field
A torque is produced as a result of the interaction of those two magnetic fields

Where ind is the induced torque and BR and BS are the magnetic flux densities of the rotor and the stator respectively
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