# Faq - 1.1.0 Electric Motors - Technology

## 1.1.1 How is the active power “P” of a 400V aluminium motor calculated

How is the active power “P” of a 400V aluminium motor calculated

## 1.1.2 Which formula is used to calculate the reactive power of a 400V motor?

Which formula is used to calculate the reactive power of a 400V motor?

## 1.1.3 How is the apparent power “S” of a cast iron three-phase motor calculated?

How is the apparent power “S” of a cast iron three-phase motor calculated?

## 1.1.4 How is the active power factor cos φ of a 400V cast iron motor calculated?

How is the active power factor cos φ of a 400V cast iron motor calculated?

## 1.1.5 How are rotors with a feather key balanced on the IP23 electric motors?

How are rotors with a feather key balanced on the IP23 electric motors?

## 1.1.6 What does the IP23 protection class of the electric motor mean?

What does the IP23 protection class of the electric motor mean?

## 1.1.7 Is a progressive three-phase motor frequency inverter suitable?

Is a progressive three-phase motor frequency inverter suitable?

## 1.1.8 Are progressive electric motors also offered according to UL/CSA?

Are progressive electric motors also offered according to UL/CSA?

## 1.1.9 When is a centrifugal switch/ starting relay used with the 230V motor?

When is a centrifugal switch/ starting relay used with the 230V motor?

## 1.1.10 Can the speed of a single-phase motor be controlled with a frequency inverter?

Can the speed of a single-phase motor be controlled with a frequency inverter?

## 1.1.11 How does the Dahlander circuit work with a pole-changing motor?

How does the Dahlander circuit work with a pole-changing motor?

## 1.1.12 How are pole-changing motors connected electrically?

How are pole-changing motors connected electrically?

## 1.1.13 How does the spring-applied brake of the brake motor work?

How does the spring-applied brake of the brake motor work?

## 1.1.14 Which brake rectifiers are used in the standard brake motor?

Which brake rectifiers are used in the standard brake motor?

## 1.1.15 What does the designation “flameproof enclosure” mean for ATEX motors?

What does the designation “flameproof enclosure” mean for ATEX motors?

## 1.1.16 Are ATEX gear motors also built with a brake?

Are ATEX gear motors also built with a brake?

## 1.1.17 What does the operating mode S6 mean for circular saw motors?

What does the operating mode S6 mean for circular saw motors?

## 1.1.18 Do circular saw motors have temperature monitoring?

Do circular saw motors have temperature monitoring?

## 1.1.19 According to which standard are SEVA parallel-shaft gear motors manufactured?

According to which standard are SEVA parallel-shaft gear motors manufactured?

## 1.1.20 What protection classes and designs do the parallel-shaft gear motors have?

What protection classes and designs do the parallel-shaft gear motors have?

## 1.1.21 In which cooling types are medium-voltage motors offered?

In which cooling types are medium-voltage motors offered?

## 1.1.22 What are the most common rated voltages of medium-voltage motors?

What are the most common rated voltages of medium-voltage motors?

## 1.1.23 What are the technical features of stainless-steel motors?

What are the technical features of stainless-steel motors?

## 1.1.24 How is a stainless-steel motor connected properly?

How is a stainless-steel motor connected properly?

## 1.1.25 What are the advantages of permanently excited DC motors?

What are the advantages of permanently excited DC motors?

## 1.1.26 Are DC motors also available as special versions?

Are DC motors also available as special versions?

## 1.1.27 What are the efficiency classes for electric motors?

What are the efficiency classes for electric motors?

## 1.1.28 How is the advantage of an energy-saving motor calculated?

How is the advantage of an energy-saving motor calculated?

## 1.1.29 What do the indications on the motor nameplate mean?

What do the indications on the motor nameplate mean?

## 1.1.30 What factors must be kept in mind when assembling an electric motor?

What factors must be kept in mind when assembling an electric motor?

## 1.1.31 Are electric motors connected in a star or delta configuration?

Are electric motors connected in a star or delta configuration?