Product Description:

The VAC-YMMC-7.5-5.5R-052 is part of the VAC Servo Motors series. It is intended for spindle service in numerically controlled machine tools, converting electrical input into the rotational power needed to hold commanded cutting speeds during automated cycles. In this role, the motor supports steady speed regulation during drilling, milling, and turning operations where the spindle must respond smoothly to load changes. Because spindle demand varies as tools enter and leave material, consistent speed control helps maintain surface finish and cycle stability.

Its continuous output capability is 7 hp, which is the power the frame can deliver indefinitely after reaching thermal equilibrium. For brief heavy-load periods, the same windings can sustain 10 hp on a 30 Min / Continuous duty basis, indicating separate short-term and continuous ratings. This format distinguishes prolonged running power from the extra output available during shorter cutting intervals. The motor has a mass of 300 lb, which affects lifting and mounting arrangements. It also requires a clearance envelope of 20 × 20 × 30 in so surrounding panels, coolant lines, cable bends, and sensor conduits can be arranged without interference.

Classified as an AC Servo Spindle Motor, the device follows the mechanical and thermal conventions used in machining centers assembled in Japan. The documented build year of 1998 places it near the transition from analog to fully digital spindle drives, so retrofit work often centers on feedback adaptation rather than the main power section. Control platforms from that period commonly relied on separate drive and feedback hardware, which makes interface matching an important part of integration. Support tooling from Okuma matches the flange pattern and helps maintain proper alignment during installation.