S32HMAA-HNNM-04 Pacific Scientific
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The Pacific Scientific S32HMAA-HNNM-04 is a 6-pole Neodymium magnet brushless servo motor from the S Brushless Motors series. It features a continuous stall torque of 4.0 Nm and a peak torque of 11.3 Nm. This motor uses a Hall sensor as its primary feedback device, has a NEMA 34 frame size, and weighs 4.9 kilograms.
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Product Description:
The S32HMAA-HNNM-04 is a six-pole neodymium-magnet brushless servo motor manufactured by Pacific Scientific for the S Brushless Motors series. Its metric mounting interface and motor-mounted MS connector support installation in servo axes that require moderate power density and compact cable routing. A 24 V DC spring-applied holding brake keeps the connected load stationary when brake power is removed. The motor does not have a shaft seal, which reduces shaft friction and suits clean, enclosed installations where the motor is protected from moisture and contaminants.
The motor provides a continuous stall torque of 4.0 Nm, allowing it to hold a stationary load while operating within its thermal limits. Its peak torque of 11.3 Nm provides additional output for short acceleration and deceleration periods. The H-type winding has a torque constant of 0.7 Nm/ARMS, relating motor current to the torque produced at the shaft. During rotation, the motor generates back electromotive force according to a voltage constant of 0.44 VRMS/rad/s, which the servo drive uses to regulate current and speed. The line-to-line inductance is 4.5 mH, affecting current rise time and current-loop response. A primary Hall sensor supplies rotor-position data for electronic commutation, while no secondary feedback device is installed.
The phase resistance is 1.6 ohms, contributing to winding voltage drop and heat generation during continuous operation. The motor weighs 4.9 kg, a value that must be considered when sizing machine supports, moving axes, or mounting plates. Rotor inertia is 0.34 kg·m² × 10−3, providing moderate dynamic response when paired with the two-stack magnetic length. The frame uses a NEMA 34 pattern, while the metric mounting face provides bolt spacing suitable for compatible machine assemblies. Its H winding supports the electrical characteristics associated with this model and allows the connected servo drive to deliver the required current without exceeding the motor’s operating limits.
