Design of asynchronous motors

We offer

  • a complete set of technical documentation for a whole series of asynchronous motors with Premium Efficiency (IE3) for the power from 0.12kW and up to 400kW for the line voltage of 400V and the number of poles of 2, 4, 6 and 8
  • a complete set of technical documentation for a whole series of asynchronous motors with Super Premium Efficiency (IE4) for the power from 0.12kW and up to 400kW for the line voltage of 400V and the number of poles of 2, 4, 6 and 8

 

We guarantee

  • our designs are experimentally verified 
  • compliance of our designs with IEC/EN 60034-30-1: 2014
  • the electromagnetic core in our designs is dimensioned in order to provide the optimal use of materials

 

Adjustability of our designs

  • we are ready to provide just a part of our documentation
  • we are prepared to adjust our designs in order to comply with requests of the client

 

Below you will find a description of our design process

 

Input data for our design process

 

Calculation steps incorporated into our design tools

 

Performance characteristics

Optimization calculation

 

Thermal analysis

 

Basic scheme of our design process

 

Capabilities of our design tools

Our design software allows the development of asynchronous motors in accordance with any preselected target on efficiency:

  • IE3 – Premium efficiency
  • IE4 – Super Premium efficiency as specified in IEC/EN 60034-30-1: 2014
  • IE5 – perspective efficiency standard

We are using our tools for designing a series of asynchronous motors in accordance with either IE3 or IE4 in a power range from 0.12 kW up to 400 kW for a line voltage of 400 V.

We can develop asynchronous motors in accordance with any of the following implementations: IP54, IP55 or IP23. We can design asynchronous motors for a line voltage of over 1000 V and for powers of over 400 kW and up to 10 MW. 

 

Validation of design

Our design tools show good correspondence with experiments. If we introduce geometry of an existing motor into the design tools, we get a good match with measured characteristics and observed temperatures. 

Below you will find a few calculations with our design tools for existing asynchronous machines and comparison with measurement data.

 

Induction motor 4A112M4

  Parameter Catalogue data / measurements Calculation
1 Nominal useful power, kW 5,5 5,5
2 Synchronous speed, rpm 1500 1500
3 Number of poles 4 4
4 Nominal line voltage, V 380 380
5 Frequency, Hz 50 50
6 Number of phases 3 3
7 Connection of phases Y Y
8 Nominal torque, Nm 36,32 36,28
9 Phase resistence at 20°C, Ohm 0,995 0,987
10 Rotation speed at nominal load, rpm 1446 1447
11 Nominal slip, % 3,6 3,5
12 Primary current, A 11,50 11,01
13 Efficiency at 50% load, % 86,5 86,3
14 Efficiency at 75% load, % 86,5 86,7
15 Efficiency at 100% load, % 85,5 85,5
16 Power factor in rel. units 0,85 0,89
17 Starting torque in rel. units 2,0 2,18
18 Starting current in rel. units 7,0 6,95
19 Critical slip, % 25,0 25,0
20 No load current, A   3,90
21 Flux density in air gap, T 0,850 0,842
22 Losses in stator winding, W   497,3
23 Losses in rotor cage, W   195,8
24 Core losses, W   182,6
25 Mechanical losses, W   28,2
26 Additional losses at nominal load, W   32,2
27 Total losses, W 932,7 936,1
28 Average temperature of stator winding at ambient temperature 40°C, °C 113,5 111,1

 

Induction motor 4A132M6

  Parameter Catalogue data / measurements Calculation
1 Nominal useful power, kW 7,5 7,5
2 Synchronous speed, rpm 1000 1000
3 Number of poles 6 6
4 Nominal line voltage, V 380 380
5 Frequency, Hz 50 50
6 Number of phases 3 3
7 Connection of phases Y Y
8 Nominal torque, Nm 73,99 73,79
9 Phase resistence at 20°C, Ohm 0,646 0,645
10 Rotation speed at nominal load, rpm 968 971
11 Nominal slip, % 3,2 2,95
12 Primary current, A 16,45 15,84
13 Efficiency at 50% load, % 84,0 84,3
14 Efficiency at 75% of load, % 85,0 85,6
15 Efficiency at 100% of load, % 85,5 85,0
16 Power factor in rel. units 0,81 0,85
17 Ratio of starting torque in rel. units 2,0 2,32
18 Ratio of starting current in rel. units 6,0 6,72
19 Critical slip, % 26,0 25,0
20 No load current, A   7,53
21 Flux density in air gap, T 0,870 0,872
22 Losses in stator winding, W   687,0
23 Losses in rotor cage, W   254,2
24 Core losses, W   304,4
25 Mechanical losses, W   29,8
26 Additional losses at nominal load, W   44,1
27 Sum of losses, W 1271,9 1319,4
28 Average temperature of stator winding at ambient temp. 40°C, °C 105,0 116,4
29 Average temperature of housing at ambient temp. 40°C, °C 77,0 73,9

 

Verification with finite elements

The purpose of this step is to confirm performance characteristics of the proposed motor design to the customer. Every motor design we deliver is verified with finite element tools in a fully automated fashion. Please, see a more detailed description of our FEA tools on electrical machines in this section. Specific tools for modelling induction motors are described here.

 

Technical documentation

 

Extra services on design of induction motors