PMB31D-20116-02
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The PMB31D-20116-02 is a NEMA Size 34 brushless servomotor with a continuous stall torque of 1.7 Nm. Manufactured by Pacific Scientific, it belongs to the PMB Brushless Servomotors series and features a 2950 RPM rated speed at 240VAC. With a peak torque of 5.1 Nm and a weight of 2.9 kg, it includes a digital encoder for commutation.
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Product Description:
The PMB31D-20116-02 is a brushless servo motor made by Pacific Scientific, and it provides a peak torque of 6.26 Nm, ideal for rugged dynamic load conditions. This motor achieves this output torque by drawing a peak current of 15.3 Arms, which provides high torque density when the load cycles are short-duration.
The PMB31D-20116-02 motor has a compact and robust design with IP40 protection, ideal for clean industrial applications where extra enclosure protection is available. For continuous duty operation, this servo motor provides a rated torque of 1.62 Nm that maintains consistent operation within its thermal capabilities. This motor combines a digital encoder with commutation that generates accurate feedback, enabling closed-loop systems with tight position control. This encoder has a resolution of 4096 pulses per revolution (PPR), which gives high accuracy for incremental position sensing, and accommodates real-time response. The electrical specifications of this motor comprise a line-to-line inductance of 5.2 mH, which allows it to react effectively under changing current load. The voltage constant of this motor is specified at 0.25 Vrms/rad/sec to provide reliable back EMF characteristics for optimized speed control. This motor accommodates a NEMA mounting design, which eases its integration into existing mechanical assemblies.
This servo motor is rated for operation with a supply voltage of 240V AC, and is capable of accepting a max DC bus voltage of 320V, which is compatible with typical servo drive electronics. The weight of the PMB31D-20116-02 servo motor is 2.5 kg, which is within reach for installations that need precise mechanical balancing. The thermal efficiency of this motor is augmented by a thermal resistance of 1.08 °C/Watt for efficient heat dissipation during continuous operation. This servo motor also demonstrates a maximum static friction of 0.09 Nm to encourage smoother starts and transitions. Having an 8-pole rotor design, this motor possesses reduced torque ripple and increased efficiency at variable speeds.
Frequently Asked Questions about PMB31D-20116-02:
Q: Why is a digital encoder with 4096 PPR beneficial in PMB31D-20116-02?
A: This high-resolution encoder ensures accurate positioning and precise commutation signals. It supports tight control loops in servo applications.
Q: How does the 8-pole rotor design in PMB31D-20116-02 affect performance?
A: The 8-pole configuration reduces torque ripple and enhances smooth rotation at varying speeds. It also improves torque output per unit volume.
Q: What does the 1.08 °C/Watt thermal resistance indicate in this motor?
A: It shows the motor's ability to dissipate heat under load. Lower thermal resistance means better thermal management during continuous operation.
Q: How does the 5.2 mH inductance affect dynamic performance?
A: Higher inductance smooths current flow and helps reduce electrical noise. It supports controlled acceleration and deceleration.
Q: Why is the PMB31D-20116-02 suitable for up to 1000m altitude installations?
A: The design ensures rated torque and speed are maintained without derating. It handles normal atmospheric conditions up to that elevation.
