Design of asynchronous motors

-> a complete set of technical documentation for a whole series of asynchronous motors with Premium Efficiency (IE3) for the power from 0.06kW 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 0.06kW 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 Ultra Premium Efficiency (IE5) for the power from 0.06kW and up to 400kW for the line voltage of 400V and the number of poles of 2, 4, 6 and 8

Please, find the detailed description in corresponding pages for IE3, IE4 and IE5 in the Products section above. Our technical documentation is enough to start off the production of a corresponding series.

1) on 2-pole asynchronous machines with all the standard output powers in the range from 0.09kW to 355kW;

2) on 4-pole asynchronous machines with all the standard output powers in the range from 0.06kW to 355kW;

3) on 6-pole asynchronous machines with all the standard output powers in the range from 0.18kW to 250kW;

4) on 8-pole asynchronous machines with all the standard output powers in the range from 0.25kW to 200kW;

We guarantee compliance of our motor designs with IEC/EN 60034-30-1: 2014. The starting torque in our motor designs is also in accordance with IEC.

-> we are prepared to adjust our designs in order to comply with technical requests of the customer

-> we are prepared to modify designs of specific components and spread these changes through the whole series;

1. Number of phases (e.g. 3)

2. Nominal power (e.g. 15kW)

3. Nominal line voltage (e.g. 380V)

4. Power supply frequency (e.g. 50Hz)

5. Synchronous rotation speed (e.g. 1500rpm)

6. International protection (e.g. IP54)

The developed design tools enable selection of a design strategy. This could be, for instance, a specific efficiency class. A starting torque ratio and a maximal torque ratio are assigned in accordance with IEC standards.

1) automatic determination of optimal dimensions of a motor for a defined height of the rotation axis, namely: the outer and the inner diameters of a stator, the air gap value, the active length of the stator, dimensions of the slots of the stator and of the rotor;

2) automatic determination of an optimal number of slots of the stator and of the rotor, an optimal number of turns in the stator winding, a cross-section of wire in the stator winding, as well as stator design and a stator winding diagram;

3) automatic electromagnetic simulation of the motor and estimation of the no-load current;

4) automatic determination of the parameters of the equivalent circuit of the motor, estimation of a power factor for the nominal load, calculation of performance characteristics of the motor;

5) automatic calculation of losses and the efficiency of the motor;

6) automatic calculation of the starting characteristics of the motor taking into account skin effects and saturation of the magnetic circuit of the motor;

7) automatic design and evaluation of the ventilation circuit of the motor;

8) automatic thermal calculation of the motor;

In this section we present a typical set of performance characteristics from our design tools for one of our designs.

 

Thermal analysis is based on an elaborate equivalent thermal circuit and graph theory.

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

IE3 – Premium efficiency as specified in IEC/EN 60034-30-1: 2014

IE4 – Super Premium efficiency as specified in IEC/EN 60034-30-1: 2014

IE5 – perspective efficiency standard (20% lower losses compared to IE4)

We are using our tools for designing 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. 

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.

 

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. 

We perform mechanical analysis of shafts, housings, bearing shields. We can estimate mechanical forces acting on the stator winding during starting of the motor.