Electric Motors by IEC Frame Size

Finding a motor from its frame code

This section is written for the situation where the first readable item on a failed or replaced motor is its frame code. Codes such as 90L, 132M, 160L or 225M do not describe power; they give the shaft centre height above the feet and the length class of the housing. Because the machine's foot holes, coupling or pulley alignment and guards were built around that height, choosing the new motor in the same frame is usually the quickest way to finish the job without modifying the mounting.

Each article covers one frame (or a short/long pair of the same frame) and lists the models actually available in the DRG shop: power, number of poles, nameplate speed, aluminium or cast iron version, shaft diameter × length and B5 flange dimensions.

Who searches by frame, and what to check

Maintenance teams usually look for a like-for-like replacement; machine builders want to see which frame fits a new design. In both cases the frame code alone is not enough. Different pole numbers in the same frame give different powers, and in some large frames the 2-pole shaft is thinner than the 4- and 6-pole shaft. Read these items together:

Frame + poles: define power and speed.
Shaft diameter × length and key: define the coupling, pulley or gearbox input.
Foot dimensions (A, B, C, K) or flange dimensions (P, N, M, S): define how it sits on the machine.
Voltage and connection: up to 3 kW 230/400 V, 4 kW and above 400/690 V.

Do not confuse standard and compact frames

Some powers are also built in a smaller frame (for example 5.5 kW in frame 112M, 11 kW in frame 132M). The compact model is shorter and lighter, but its feet, shaft and flange belong to its own frame; if it replaces a standard motor, compare the dimensions separately. Compact models are shown on their own line in the frame articles.

Dimension tables and drawings

The motor current chart and the cable size calculator help with the electrical side; dimensioned PDF drawings are on the 2D technical drawings page. Small flange (B14) and foot-and-small-flange (B34) dimensions are not offered in the same way for every frame, so send us your measurements for confirmation.

Browsing in the shop

Every article ends with product cards for the motors in that frame; open a card to see the current price, technical data and ordering steps. To filter all models by power and speed, use the online electric motor shop; for an overview of the product family see three-phase asynchronous electric motors. Send a nameplate photo and the shaft/flange size on WhatsApp and we will identify the matching frame with you.

Electric Motors by IEC Frame Size 30.10.2026