YASKAWA SGMPH-08A1A41 750W Servo Motor with Gearbox

The YASKAWA SGMPH-08A1A41 is a 750-watt AC servo motor from the Sigma II series, representing the highest power rating within the SGMPH product line. When combined with the SG05SA-PA08A1 gearmotor and LP090-M01-5 planetary gearbox, this system provides a complete motion solution capable of delivering high torque at reduced speeds for demanding industrial applications. This integrated system is ideal for applications requiring precise positioning with high load capacity.

Product Overview

The SGMPH-08A1A41 is the flagship model of the SGMPH servomotor series, offering 750W of rated output power. This 200V three-phase motor is engineered to provide an optimal balance between power density and dynamic response. The Sigma II series, to which this motor belongs, redefined industry standards for AC servo performance and continues to be widely used in precision motion control applications worldwide. The SGMPH series features a medium-inertia rotor design specifically optimized for applications with varying load characteristics. This inertia matching ensures stable system operation even under rapid acceleration and deceleration cycles, making the motor a preferred choice for high-speed packaging, electronic assembly, and robotic applications requiring precise motion control.

SGMPH-08A1A41 Servo Motor Specifications

The SGMPH-08A1A41 delivers 750W of rated output power with a rated torque of 2.39 Nm and instantaneous maximum torque of 7.16 Nm. The motor operates at a rated speed of 3000 RPM and can achieve a maximum speed of 5000 RPM. The power supply requirement is 200 VAC three-phase with a rated current of 3.7 A. The rotor inertia is 0.87 × 10⁻⁴ kg·m², providing excellent dynamic response for high-acceleration applications. The motor incorporates a 13-bit incremental encoder with 8192 pulses per revolution, providing high-resolution feedback for precise position and speed control. The encoder resolution allows for accurate motion control suitable for demanding automation tasks including CNC machining, robotic manipulation, and precision assembly. The insulation class is Class B, and the motor housing provides IP65 protection against dust and water ingress. The motor also includes a 24 VDC holding brake as a standard feature for maintaining position when power is removed.

SG05SA-PA08A1 Gearmotor Integration

The SG05SA-PA08A1 is a gearmotor assembly designed for integration with Yaskawa servo motors. This gearmotor incorporates a precision planetary gear train that reduces output speed while multiplying torque output. The gear ratio of the SG05SA-PA08A1 is optimized for applications requiring significant torque amplification while maintaining smooth operation. The gearmotor's design includes considerations for backlash reduction, ensuring that positioning accuracy is maintained even after speed reduction. The SG05SA series gearmotors are part of the Sigma II servo system product line, designed to work seamlessly with SGMPH servomotors. The gearmotor housing is manufactured from high-strength aluminum alloy for excellent thermal dissipation and rigidity. The input and output shafts are supported by precision bearings for long service life and minimal runout. When paired with the SGMPH-08A1A41, the SG05SA-PA08A1 gearmotor transforms the motor's high-speed, low-torque output into low-speed, high-torque rotation suitable for applications requiring significant force at reduced speeds.

LP090-M01-5 Planetary Gearbox

The LP090-M01-5 is a low-backlash planetary gearbox that serves as the foundation of a high-performance servo system. As a core component, this planetary gearbox efficiently converts the high-speed, low-torque output of the servo motor into low-speed, high-torque rotation. The optimized planetary gear design ensures extremely low angular backlash, which provides high rigidity, excellent synchronization, and superior positioning accuracy for motion control systems. The LP090 series gearboxes are designed with precision-machined planetary gears that distribute load across multiple tooth contacts, resulting in high torque capacity within a compact form factor. The low backlash characteristic, typically less than 3 arc-minutes, is critical for applications requiring bidirectional positioning accuracy, such as CNC machinery, robotics, and precision indexing systems. The gearbox housing is sealed and lubricated for life, requiring no maintenance under normal operating conditions. The input and output connections are standardized to match Yaskawa servo motor mounting dimensions, simplifying assembly and ensuring proper alignment.

System Applications and Benefits

The complete system consisting of the SGMPH-08A1A41 servo motor, SG05SA-PA08A1 gearmotor, and LP090-M01-5 planetary gearbox provides a turnkey motion solution for demanding industrial applications. Typical applications include robotics requiring high torque at the wrist or elbow joints for handling heavy payloads, CNC machinery needing precise axis control with high cutting forces for machining metals, material handling equipment requiring controlled acceleration of heavy loads such as palletizers and transfer systems, packaging machinery needing consistent torque across varying speeds for sealing and cutting operations, and specialized manufacturing equipment where space is limited but high torque is required. The combination of Yaskawa's Sigma II servo technology with precision planetary gearing delivers the performance characteristics needed for modern automated manufacturing: high torque density, precise positioning capability, smooth motion at low speeds, and reliable operation in industrial environments. This system represents a complete motion control solution that can be directly integrated into new machine designs or used to upgrade existing equipment for improved performance and reliability.

Torque and Speed Characteristics

With the combined gear reduction of the SG05SA-PA08A1 and LP090-M01-5, the output torque at the gearbox shaft is multiplied by the product of the gear ratios. The maximum continuous output torque at the gearbox output is significantly higher than the motor's rated torque, allowing the system to drive larger loads than the motor alone could handle. The rated output speed is reduced proportionally to the gear ratio, providing fine control at low speeds while maintaining high torque capability. The system's torque-speed curve is characterized by a flat torque region up to the rated speed, followed by a constant power region up to the maximum speed. This characteristic makes the system suitable for applications requiring both high torque at low speeds and the ability to traverse quickly between positions. The gearbox's efficiency rating exceeds 95% for planetary designs, ensuring that most of the motor's power is delivered to the load rather than lost as heat within the gear train.

Installation and Alignment

Proper installation of the complete motor and gearbox assembly requires attention to alignment and mounting procedures. The SGMPH-08A1A41 motor mounts directly to the SG05SA-PA08A1 gearmotor using the provided mounting bolts and pilot diameters to ensure concentricity. The LP090-M01-5 gearbox then mounts to the output of the gearmotor, completing the assembly. The entire assembly should be mounted to a rigid machine frame or bracket capable of supporting the weight and withstanding the reaction torques generated during operation. Flexible couplings should be used to connect the gearbox output shaft to the load if any misalignment is expected. The motor cable must be routed with sufficient slack to allow for any movement of the assembly, and the brake cable, if used, should be properly connected to the amplifier. Proper grounding of the motor and gearbox is essential for electrical safety and electromagnetic compatibility.