Yaskawa SGMPH-04AAA61D-OY AC Servo Motor

The Yaskawa SGMPH-04AAA61D-OY is a compact AC servo motor from the SGMPH series, delivering a rated output of 400 watts for automation applications requiring rapid acceleration and high torque density. This motor achieves a rated speed of 3000 revolutions per minute and a rated torque of 1.27 Newton meters, characteristics particularly suited for high-speed pick and place operations, small conveyor drives, and precision positioning axes. The SGMPH-04AAA61D-OY is classified as a low-inertia design, meaning the rotor mass is deliberately minimized to achieve the highest possible acceleration rates in response to command changes, reducing positioning times in cyclic operations.

Feedback and Position Control Integration

The motor incorporates a 13-bit incremental encoder as its position feedback device. This encoder produces 8,192 pulses per revolution, providing resolution sufficient for precise positioning in standard automation applications requiring closed-loop velocity and position control. As an incremental encoder, it outputs relative position information by generating pulses in quadrature phase relationship as the motor rotates. The host servo driver counts these pulses and determines rotation direction based on the phase difference between encoder channels. The SGMPH-04AAA61D-OY normally operates with Yaskawa Sigma II series servo drivers, which process encoder signals through high-speed counter circuits and execute closed-loop control algorithms. The encoder signal is transmitted to the driver through a shielded cable, maintaining signal integrity even when the motor is located several meters from the control cabinet.

Mechanical Construction and Environmental Protection

The SGMPH-04AAA61D-OY features straight shaft end configuration with integral keyway and tapped hole for secure mechanical coupling to driven equipment. The key and keyway provide positive torque transfer without slipping, while the tapped hole supports axial retention through bolt attachment. The motor housing includes standard oil sealing, protecting internal components such as bearings, windings, and the encoder assembly from contaminants common in industrial environments. This sealing extends operational life in applications where lubricants, coolants, or particulate matter might otherwise penetrate the enclosure. The motor meets the insulation requirements for inverter-driven AC motors, withstanding the high-voltage spikes generated by modern pulse-width modulated servo drivers.

Electromagnetic Brake System

The SGMPH-04AAA61D-OY includes an integral electromagnetic holding brake as a standard feature, providing fail-safe load-holding capability essential for vertical axis applications, position maintenance during power-off conditions, and safety-related functions where unexpected load movement must be prevented. The brake is spring-applied and electrically released, meaning the brake engages automatically when power to the brake coil is removed. In normal operation, applying 24 Volt DC power to the brake coil generates a magnetic field that pulls the brake armature away from the friction surface, releasing the motor shaft for rotation. When power is disconnected, spring force presses the armature against the friction surface, generating holding torque to prevent shaft rotation. This configuration ensures that if control power fails or the driver shuts down, the brake automatically engages to hold the load in position. The brake operates independently of the servo driver’s main power stage, requiring a separate 24 V DC supply typically provided by the servo driver’s control power output.

Electrical Specifications

The SGMPH-04AAA61D-OY operates from a 200 Volt AC three-phase power supply at a rated current of 2.6 amperes. The motor utilizes an 8-pole design that balances torque production with smooth rotation, and incorporates class B insulation materials rated for the thermal conditions encountered during normal operation. The SGMPH-04AAA61D-OY mates with a power connector and an encoder feedback connector, securely retaining connecting cables under vibration. Connection is established using circular connectors that are industry-standard for Yaskawa Sigma II series motors, simplifying cable selection for system integrators.