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Archive: Category «Electric Motor»

Comparison of motor speed control methods

It is often desirable to control the motor speed, usually for reasons process control for such variables as flow or pressure. Such applications as fans and pumps often have varying… Read more

Mar 13, 2015 | Edvard

Comparison of motor speed control methods

The most common LV/MV motor starting devices

The most common motor starting device is the low voltage motor-starting contactor. A contactor is defined as “a two-state ON-OFF device for repeatedly establishing and interrupting an electric power circuit.” Contactors are… Read more

Jan 14, 2015 | Edvard

The Most Common LV/MV Motor Starting Devices (on photo: Allen Bradley contactor)

When to Buy Premium Efficiency Motors?

Using premium efficiency motors can reduce your operating costs in several ways. Not only does saving energy reduce your monthly electrical bill, it can postpone or eliminate the need to expand the electrical… Read more

Dec 31, 2014 | Edvard

When to Buy Premium Efficiency Motors?

8 NEC Basic Feeder Circuit Sizing Requirements

Once the branch circuit loads are calculated, the feeder circuit loads may be calculated by applying demand factors to the branch circuit loads. General Lighting Loads (Article 220.42) Show window… Read more

Dec 17, 2014 | Edvard

8 NEC Basic Feeder Circuit Sizing Requirements

Energy Efficiency Aspects of Electric Motors

Three-phase squirrel-cage induction motors comprise a considerable percentage of the electrical load in the United States. Design, operation, and maintenance of these machines is well described in some of the… Read more

Oct 01, 2014 | Edvard

Energy Efficiency Aspects of Motors

Motor Starting via Chokes or Resistors

The series-connected chokes (Figure 1) or resistors (Figure 2) reduce the voltage at the motor and hence also the starting current. The starting torque is reduced by around the square… Read more

Mar 07, 2014 | Edvard

Motor Starting via Chokes or Resistors


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