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S1

Continuous Duty

S2

Short-Time

S3...S10

Intermittent Duty

Energy-efficiency motors

Energy-efficient gearboxes, belts, ...

Variable speed drive systems

Most efficient power-supply

Power-factor correction devices

Energy-efficient pumps, fans, compressors,...

Reducing elec. transmission losses

Low-energy mode during stand-still

Electrical

Mechanical

Application

Factory

Energy

components

components

Automation

Recouperation

Use most economical components

Proper and regular maintenance

In continuous duty applications, improved efficiency of the electrical motor is beneficial. An improved power factor (frequency-converter, synchronous motor) can help reduce I²R losses in cables. Mechanical optimizations (gearbox, belts, pumps, fans etc.) may lead to much greater savings than improvements of the electrical motor. The application must be regarded as well. Proper maintenance and demand oriented speed control are often helpful.

  • IEC 60034-31:2009

  • 8–

2/1554/CD

ηn

is the nominal efficiency, %

ηN

is the rated efficiency, %

fN

is the rated frequency, Hz

nN

is the rated speed, min-1

PN

is the rated output power, kW

UN

is the rated voltage, V

Energy can be saved in different areas of electrical drive systems depending on the duty type (continuous or intermittent).

4

General

Figure 1

3.2

Symbols

Overview of different areas for savings of electrical energy with drive systems

Soft-start

Consider

with frequency

rotating

control

inertia

Variable speed drive systems

Most efficient power-supply

Regenerative braking

DC-link coupling

Optimized mass and flow

Low-energy mode during stand-still

Batteries, ultra-caps, fly-wheels etc.

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