Product Description:

The VAC-MF7.5-5.5R-7.53-R1 belongs to the VAC Servo Motors series manufactured by Okuma. It is an AC servo unit intended for axis and spindle duties in CNC machinery, where precise velocity and torque regulation are required for positioning and cutting cycles. Within the series, this model covers mid-range power demands and integrates with Okuma drive amplifiers to convert commanded current into mechanical rotation for automated equipment. That flexibility is useful in machining centers that alternate between rapid traverses and material-removal cycles.

For intermittent heavy loading, the motor can deliver 7.5 kW of mechanical output for 30 minutes while drawing a peak phase current of 38 A. This time-limited rating supports rapid acceleration or short machining bursts without overheating. During continuous duty, its thermal design supports 5.5 kW, allowing sustained feed or contour movements. Speed capability spans two rated points: a low-speed constant-torque value and a high-speed constant-power region combined in 750/6000 RPM, covering both threading speeds and high-surface-finish cuts. The electromagnetic circuits are energized by a DC bus that operates at 170 V, so drive selection must provide this voltage under regenerative and motoring conditions.

The continuous thermal envelope is associated with a line current of 30 A, which affects conductor sizing and breaker settings during service. Mass contributes to heat dissipation and inertia; at 105 kg, the rotor-stator assembly provides a stable base for load matching in larger lathes and machining centers. Shaft support is handled by a deep-groove ball bearing on the drive end coded 6308ZZ, while the opposite end uses a slightly smaller 6208ZZ. Using shielded bearings at both ends helps keep internal components protected from contamination during normal operation. This bearing arrangement limits radial runout and supports long service life.