Stepper Motors

Ordinary vacuum rated stepper motors cannot operate for long at pressures lower than 10-4 Torr. Empire Magnetics Commercial Grade Vacuum Rated Stepper Motors are constructed to allow extended operation at pressures as low as 10-7 Torr without a sacrifice in motor performance.

Some vacuum applications cannot tolerate contamination by motor outgassing products. To accommodate a range of motor cleanness requirements, Empire Magnetics provides three grades of vacuum rated stepping motors in the full range of environmental motor sizes.

Frame size selection:

Commercial Grade Vacuum Rated Stepper Motors are typically made in groups or families, the families are identified by the outer diameter or size of the square, these references are called frame sizes. In the American system, a 23 frame is a nominal 2.3 inches in diameter. For motors less than one inch in diameter, the reference is typically known as a size. Herein is a list of the frame sizes offered by Empire Magnetics Inc. and some of the characteristics of the group that will allow you to select from them.

Frame Size 11 (1.1 Inch OD): These Commercial Grade Vacuum Rated Stepper Motors are very low power, suitable primarily for instrumentation applications. Torque range of .5 to 2.5 oz-in. Cylindrical shaped motor with square front flange.

Frame Size 17 (1.7 Inch OD): These Commercial Grade Vacuum Rated Stepper Motors are relatively low power useful for a wide range of industrial applications. Torque range of 13 to 26 oz-in. Cylindrical shaped motor laminations, with square end flanges front and rear. Since this motor does not have a housing, it is not available in all environments.

Frame Size 23 (2.3 Inch OD): Extremely popular size useful for a wide range of industrial applications. Torque range of 60 to 150 oz-in. Cylindrical shaped motor with square front flange.

Frame Size 34 (3.4 Inch OD): Power range of 80- 240 watts, useful for a wide range of applications. Torque range of 150 to 450 oz-in. Cylindrical shaped motor with square front flange.

Frame Size 42 (4.2 Inch OD: Power range of 240-700 watts, relatively high power in the stepper motor range. Torque range of 400 to 1600 oz-in. Cylindrical shaped motor with square front flange