Product Description:

The VAC-MFL7.5-5.5R-157T1 is an Okuma spindle drive motor in the VAC Servo Motors series. Designed for closed-loop speed control, it interfaces with Okuma inverter drives to maintain precise spindle velocity during cutting cycles. The motor serves as the drive source in machining centers, translating programmed motion commands into stable spindle rotation that supports consistent surface finish, accurate tool engagement, and dimensional repeatability in automated production equipment.

During sustained machining, the rotor is regulated at a base speed of 1500 rpm, which is the point where voltage, frequency, and mechanical load remain balanced. At that speed, the frame can deliver a continuous shaft power of 5.5 kW, and this output can be maintained without overheating under normal operating conditions. The duty cycle is continuous duty, indicating that thermal steady state is reached under permanent load rather than time-limited bursts. Power is transmitted to the spindle through a belt-driven coupling, allowing pulley ratios to tailor cutting speeds while isolating the motor from shock loads. Okuma classifies the device as an AC spindle motor, so its torque is produced by three-phase stator excitation controlled by a variable-frequency inverter.

For short climbing cuts or rapid material removal, the motor can exceed its thermal equilibrium rating. A peak output of 7.5 kW is available for up to 30 min before temperature thresholds are reached, giving the system additional power for temporary overload conditions. The unit is a spindle drive motor, so encoder feedback is routed to the CNC logic for spindle-angle alignment with toolpath commands. Mounting pitch and connector orientation remain consistent with related models in the product line, which helps preserve fit within standard spindle assemblies and keeps cable routing aligned with established machine layouts.