VAC-MF7.5-5.5R-153 Okuma
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The Okuma VAC-MF7.5-5.5R-153 is a servo motor from the VAC Servo Motors series with a rated speed of 1500 or 6000 rpm and a rated voltage of 170 V. It delivers 5.5 kW of continuous power and 7.5 kW of 30-minute power, with a continuous current of 32 A and a 30-minute current of 37.5 A. The servo motor weighs 90 kg and uses 6308ZZ and 6208ZZ bearing sets.
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Product Description:
The VAC-MF7.5-5.5R-153 is a servo motor produced by Okuma and assigned to the VAC Servo Motors series. As an electromechanical actuator, it supplies controlled torque and speed for numerically controlled machine axes and other automation equipment in manufacturing lines. The motor receives regulated current from a matched VAC drive and delivers mechanical rotation that follows command profiles. Because the drive controls current directly, the motor can support smooth interpolation on contouring axes as well as steady feed motion on linear slides. Its duty in these systems is to convert electrical input into repeatable shaft motion with low delay between command and response. This makes it suitable for positioning, cutting, and feed applications that require precise response during repeated starts, stops, and speed changes.
For short, intermittent loads lasting up to thirty minutes, the winding can accept 37.5 A. Under that condition, the shaft can produce 7.5 kW of mechanical output before thermal limits are reached. For continuous duty, current falls to 32 A, and the available output is 5.5 kW. The higher short-term current supports brief overload periods, while the continuous rating reflects operation that can be maintained without interruption. A rated bus of 170 V is specified, so the drive and cabling must match this working voltage.
To support this operating range, the rotor is balanced for dual nominal speeds of 1500/6000 rpm. This allows lower-speed cutting passes and higher-speed finishing moves on the same axis without changing the motor. The mechanical load is carried by a matched deep-groove bearing pair, cataloged as 6308ZZ / 6208ZZ, which supports axial thrust while containing lubricant and excluding contaminants through metal shields. The shielded bearing arrangement also helps reduce the entry of shop debris in enclosed motor installations. Overall mass reaches 90 kg, so the mounting structure must be sized for the motor's weight during installation and operation. This weight also affects base rigidity and handling during machine assembly.
