55NM81-000-1 Pacific Scientific
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The Pacific Scientific 55NM81-000-1 is part of the Low Inertia PMDC Servomotors series and offers a rated speed of 1970 RPM with a rated torque of 1.179 Nm. This motor features a rated voltage of 30 V, rated power output of 243 W, and a continuous stall torque of 1.25 Nm. Its mechanical time constant is 2.8 ms and its rotor inertia measures 7.1e-5 kg-m^2.
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Product Description:
The 55NM81-000-1 is a permanent-magnet DC servomotor produced by Pacific Scientific as part of its Low Inertia PMDC Servomotors series. The unit is intended for closed-loop industrial axes that demand quick acceleration and controlled deceleration, such as small pick-and-place stages or light-duty web handling reels. A light rotor design lowers inertia, allowing the drive to reverse or settle rapidly so the connected controller can maintain tight positional accuracy.
A back electromotive-force constant of 11.47 V/kRPM indicates the voltage that appears at the terminals when the shaft spins freely, making speed estimation by the drive electronics straightforward. During continuous operation, the frame can dissipate 130 W of heat, keeping the winding temperature within safe limits. The motor can hold a load at stall with 1.25 Nm of torque, and it reaches 63% of final speed in the mechanical time constant of 2.8 ms, illustrating how rapidly it reacts to command changes. Copper resistance at 25 °C is 0.47 ohms, so the controller must supply current while accounting for I²R heating. With no mechanical load, the armature turns at 2535 RPM, giving the drive enough headroom to regulate speed down to the rated value under load.
Dynamic events can be supported because the winding can accept up to 62 A in short pulses, while steady operation is set at a rated current of 12.4 A. Under these conditions, the shaft delivers 243 W at 1970 RPM and 1.179 Nm when fed by a 30 V supply, matching many low-voltage servo amplifiers. A 100 µH rotor inductance smooths current transitions, and the 7.1 × 10⁻⁵ kg·m² rotor inertia limits overshoot when direction changes are frequent. Heat transferred from the winding to the case moves through a thermal resistance of 1.00 °C/W, while the 0.1095 Nm/A torque constant links commanded current directly to developed torque for drive tuning.
Frequently Asked Questions about 55NM81-000-1:
Q: What is the rated torque of the 55NM81-000-1 servomotor?
A: The 55NM81-000-1 features a rated torque of 1.179 Nm, supporting applications that require consistent torque output.
Q: What is the rated speed of the 55NM81-000-1 servomotor?
A: This servomotor has a rated speed of 1970 RPM for standard operation.
Q: What is the rated voltage for the 55NM81-000-1 servomotor?
A: The 55NM81-000-1 operates at a rated voltage of 30 V.
Q: What is the continuous stall torque of the 55NM81-000-1 servomotor?
A: The continuous stall torque is specified at 1.25 Nm for this model.
Q: What is the maximum pulse current supported by the 55NM81-000-1 servomotor?
A: With a pulse current maximum of 62 A, this motor can handle transient high-current demands.
