Product Description:

The VAC-MFL7.5-5.5-157T1-R1 is a spindle-class servo motor produced by Okuma for the VAC Servo Motors series. It is intended for industrial automation where precise speed regulation and torque delivery are required at the spindle of machining centers, lathes, or automated cells. The motor couples to mechanical loads through a belt transmission and returns position data to the CNC so that cutting, drilling, or turning sequences remain synchronized with programmed motion profiles. This arrangement helps the control system maintain stable spindle behavior during load changes and repeated speed adjustments.

For short-duration peaks, the unit can deliver 7.5 kW of mechanical output, whereas its continuous operating window is limited to 5.5 kW. The rated shaft speed is 1500 rpm, and this speed sets the electrical frequency and cooling demand at nominal load. Under this condition, the motor supplies a 30-minute torque of 47.3 Nm, while the steady-state torque is 34.7 Nm. The separation between peak and continuous output helps the drive handle temporary cutting loads without treating them as normal operating demand, and the torque values show how the motor behaves during both short and sustained duty.

The motor also supports a maximum spindle surface speed of 8000 rpm, which allows higher spindle speed when the selected pulley ratio is taken into account. Mechanical linkage uses a V-belt, which helps absorb shock and allows straightforward adjustment of belt tension during installation. Positional feedback is furnished by a magnetic encoder, which continues to provide stable signal tracking in areas where dust or coolant mist may be present. Belt-driven spindle systems can also use different pulley ratios without changing the motor itself, which gives the machine builder flexibility when matching spindle speed to the process.