[Basic knowledge] Commonly used installation methods of motors, their codes, and dimensions

The way an electric motor is mounted (see diagram below) refers to how it is connected to the frame or other components in a mechanical system. There are two code forms, one is IMBx and the other is IMVy. Among them, IM is the internationally accepted installation method code; B represents horizontal type, which is limited to the motor axis being horizontal; V represents vertical type, which is limited to the motor axis being vertical; x and y are each 1 to 2 numbers, indicating the connection location and direction.

Motor installation type code

IM＋B (or V)＋Arabic numerals (1-2 digits)

IM: The abbreviation of "Installation al Mounting type" in English;

B: Indicates that the motor is installed horizontally when in use, with the shaft in the horizontal direction;

V: Indicates that the motor is installed vertically when in use, with the axis perpendicular to the horizontal direction.

Note: The main shaft extension end of the motor is uniformly referred to as the "D" end. If it is a double-shaft extension motor, the auxiliary shaft extension end is uniformly referred to as the "N" end.

IMB installation code explanation

B3——Horizontal type installed on foundation components with footings;

B35——Horizontal borrowed foot is installed on the basic component, and is attached with flange installation;

B5——Horizontal flange installation;

B6 - horizontal type installed on the wall with feet, the feet are on the left when viewed from the D end;

B7 - horizontal type installed on the wall with feet, the feet are on the right when viewed from the D end;

B8 - Horizontal type installed on the top with feet;

B9——Horizontal D-end without end cover is installed on the end face of the D-end machine base;

B15——The horizontal type adopts the main installation on the foot, and the D-end without end cover adopts the auxiliary installation on the end of the machine base;

B20——Horizontal type has raised feet and is installed on the basic components with the feet.

Rule: There are no auxiliary or additional installations with only one numerical code.

IMV installation code explanation

V1——Vertical installation with flange, D end facing down;

V15 - vertical installation on the wall with feet and flange for additional installation, with the D end facing downward;

V3——Vertical installation with flange, D end facing up;

V5 - vertical installation on the wall with feet, D end facing down;

V6——Vertical installation on the wall with feet, D end facing up;

V8——Vertical D-end without end cover, installed on the end face of D-end machine base, with D-end facing down;

V9——Vertical D-end without end cover, installed on the end face of D-end machine base, with D-end facing up;

V10 - The vertical machine base has a flange and is installed with the D end facing downward;

V16 - The vertical base has a flange and is installed with the D end facing up;

The above codes are only for the installation methods of the motor and basic components, and other codes are used for the connection methods with the equipment.

To put it simply, there are three commonly used installation methods for three-phase motors: B3, B5, and B35. B3 has a base and no direct-connected mounting flange; B5 has no base and has a directly-connected mounting flange; B35 has a base and has a directly connected mounting flange. Direct mounting flange.

Installation dimensions of commonly used motors in national standards

IMB3 (base with feet, no direct mounting flange)

IMB5 (the base has no feet and has a direct mounting flange)

IMB35 (base with feet and direct mounting flange)