PMB31D-20116-00
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The PMB31D-20116-00 is a NEMA Size 34 brushless servomotor offering a continuous stall torque of 2.11 N·m (18.7 lb-in). Manufactured by Pacific Scientific, it is part of the PMB Brushless Servomotors series and weighs 2.5 kg (5.5 lb). It features 4096 ppr encoder resolution and a peak torque of 6.26 N·m (55.4 lb-in).
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Product Description:
The PMB31D-20116-00 Brushless Servo Motor from Pacific Scientific is designed to provide a rated speed of 6000 rpm and is thus fit for high-speed automation applications. The continuous stall torque of this servo motor is 2.11 Nm, so it provides consistent torque output under sustained load conditions without heating.
The continuous stall current of this motor is defined at 5.1 Arms to enable sustained operation in the case of long cycles. During the maximum load condition, this motor is capable of delivering a nominal stall current of 5.4 Arms for increased torque requirement at startup or acceleration stages. This motor has a digital encoder with commutation that offers 4096 pulses per revolution with high-resolution feedback for precise control to facilitate operations with real-time monitoring. The torque constant of this brushless motor is 0.41 Nm/Arms (RMS), which enables efficient torque generation per unit current possible to provide controlled power delivery. This servo motor’s electrical resistance (line-to-line) is 2 Ohms, which maintains control of current flow and reduces power loss when it is operating. The shaft style of the PMB31D-20116-00 motor is square key, which provides a rugged mechanical interface for torque transmission without slipping.
The thermal time constant of 28 minutes helps this motor in maintaining stable temperature operation, and prolongs its life by ensuring gradual temperature increase without degrading insulation. This motor’s length is 134 mm, with a space-saving footprint that fits within tight spaces without compromising performance. This motor’s electrical integration is provided by flying leads with AMP connectors, which enhances installation and diminishes wiring complexity in control cabinets or assemblies. The rotor inertia of this motor is 0.137 kgm² x10⁻³ for rapid acceleration and deceleration in dynamic systems. The viscous damping coefficient of the PMB31D-20116-00 motor is 0.0124 Nm/kRPM to ensure minimal vibration.
Frequently Asked Questions about PMB31D-20116-00:
Q: How does the 4096 ppr encoder improve motor performance?
A: It enhances position accuracy and control resolution, which is critical for fine motion tasks. This results in smoother operation and reduced positioning error.
Q: Why is the square key shaft type used in the PMB31D-20116-00?
A: The square key ensures non-slip torque transmission under high mechanical loads. It maintains shaft alignment in demanding industrial applications.
Q: How does the 0.0124 Nm/kRPM damping coefficient affect motor behavior?
A: It reduces mechanical oscillation and helps achieve smoother rotational response. This is essential for precision-driven applications.
Q: What is the function of the thermal time constant in motor operations?
A: It indicates the motor's thermal response time under load. A 28-minute constant allows gradual heat dissipation, preventing overheating.
Q: How does the flying lead with AMP connectors support system integration?
A: It simplifies electrical installation and ensures secure connectivity. This minimizes connection faults and supports faster maintenance.
