Frame design control
In a motor using a seat bearing, the base is symmetrical to the centerline of the length of the armature core. The determination of the cross-section dimensions of the base mainly depends on the calculation of the magnetic circuit and the requirements of the stiffness. Usually, the former is satisfied, and the latter is also often satisfied. The rigidity requirements of the DC motor frame will be introduced separately. For large motors that undertake important tasks, it is sometimes necessary to increase the axial length between the front end cover of the commutator side and the front bearing so that when the power fails, the machine can be turned on. The seat is removed in the direction of the commutator for repair.
Regardless of the end cap bearing or the seat bearing, when selecting the height of the foot, it should be considered to be able to attach and remove the pole fixing screw. If a split-half base is used, it should be considered at the same time as the position of the pole fixing screw when arranging its split half position. For the sake of stability, for a motor with a foot fixed, through the center of the machine's center of gravity, or when using a cap bearing, the vertical line through the center of mass of the motor must be within the outer line of the motor foot.
