Basically, three types of standard motors exist: Foot-mounted motor, flange-mounted motor with tapped-hole flange and flange-mounted motor with free-hole flange The motor types differ from one another in the way they are mounted in differ- ent applications
Foot-mounted motor:
This kind of motor is mounted in the application by a foot with holes The foot can either be integrated, (normal for cast iron motors) or it can be retrofit- ted, (normal for motors with stator housing made of aluminium)
Motor with tapped-hole flange:
This type of motor is mounted in the application by means of bolts, which are screwed into the drive-end flange In the drive-end flange there are threaded holes with standardised thread size and placed in a standardised pitch circle diameter
Motor with free-hole flange:
This type of motor is mounted in the application by means of bolts through free-holes in the drive- end flange The diameter of these free-holes is stand- ardised and the holes are placed in a standardised pitch circle diameter
Combination of flange and foot:
The above-mentioned motor types can be com- bined in different ways:
• Horizontally or vertically
• With the shaft end pointed in different
directions
• With the foot turned in different directions The combinations are described in mounting des- ignations and are defined with codes according to IEC 60034-7
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