Product Description:

The VAC-MF7.5-5.5R-7.53-R1-R is a three-phase AC servo motor manufactured by Okuma and supplied within the VAC Servo Motors series. In closed-loop motion systems, this motor couples directly to feed axes or spindle assemblies, converting controlled electrical energy into precise rotational movement required for tool positioning, contour cutting, and coordinated industrial automation tasks. Its electromechanical design targets high-duty machine tools such as multitasking lathes, vertical mills, and gantry cutters.

During continuous duty, the stator windings draw a rated current of 30 A, allowing the motor to deliver a steady mechanical output of 5.5 kW. When the application demands short-term overloads, a 30-minute duty rating elevates the current to 38 A and raises the output power to 7.5 kW. All operating modes rely on a DC bus that the drive generates from a line supply and maintains at approximately 170 V; this voltage determines the back-EMF ceiling and sets the speed-torque gradient. These electrical limits guide inverter sizing, cable selection, and thermal management so that prolonged acceleration sequences remain within safe temperature margins.

Mechanical service intervals are influenced by the drive-end deep-groove ball bearing coded 6308ZZ and the opposite-end bearing coded 6208ZZ, both pre-lubricated and shielded to retain grease during high-speed rotation. The rated speed range spans 750 to 6000 rpm, giving slow-torque capability for feed motions and high-speed capability for finishing cuts without changing hardware. With a total mass of 105 kg, the motor adds significant inertia to the axis, which is a consideration when calculating dynamic response and counterbalance requirements. These bearing choices and the motor mass affect mounting support, vibration damping, and maintenance planning in automated machining centers.