PMB31B-20200-00
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The Pacific Scientific PMB31B-20200-00 is part of the PMB Brushless Servomotors series and features a flange-mounted motor brake with a holding torque of 20 Nm. It operates at 24 VDC and has an IP54 protection rating. Weighing 3.2 kg, it is RoHS compliant and offers a cycle life of 1,000,000 cycles.
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Product Description:
The PMB31B-20200-00 Brushless Servo Motor by Pacific Scientific has a NEMA 34 frame, which is a standard that ensures easy mounting and compatibility with numerous systems. This motor features flying leads with MS connectors, which are robust and reliable connections that perform well in high-performance applications.
The shaft of this motor is designed as a square key type for a rigid coupling and to avoid slip conditions under high torques. The PMB31B-20200-00 motor comes with a rated torque of 1.90 Nm, which is its continuous operating capability during normal usage. It also features a continuous stall torque of 2.11 Nm, which enables it to maintain or resist loads during standstill conditions without excessive heating. This motor can provide its maximum torque using 8 Arms of current, indicating its capability to sustain heavy workloads. The design of this brushless motor features an 8-pole arrangement, enhancing smooth motion and providing precise rotational performance for stable drive applications. This motor’s rotor is made from neodymium-iron-boron magnets, which have high magnetic energy density. This magnet has substantial torque density and enables a compact size without compromising output.
The rotor inertia of 0.137x10⁻³ kgm² aids in faster acceleration and deceleration with less overshoot. The electrical parameters of this motor include a line-to-line inductance of 19.6 mH to assist in regulating current flow and ensure efficiency in continuous duty cycles. This brushless motor also offers a voltage constant of 0.49 Vrms/rad/sec, which describes the voltage output in relation to speed. The viscous damping coefficient of this motor has a rating of 0.0124 Nm/kRPM, providing minimum oscillations and stable performance during speed changes. The thermal response time of the PMB31B-20200-00 servo motor is 28 minutes to determine its rate of heating during long-term operation.
Frequently Asked Questions about PMB31B-20200-00:
Q: Why are neodymium-iron-boron magnets used in this motor?
A: They provide high magnetic energy density for compact construction. This allows higher torque output in smaller frame sizes.
Q: How does the square key shaft benefit the PMB31B-20200-00 motor?
A: It provides rigid mechanical coupling under load. This design prevents slippage during high torque transmission.
Q: Why is the rotor inertia value of 0.137x10⁻³ kgm² important?
A: It enables quick speed transitions with controlled overshoot. This supports applications requiring fast acceleration.
Q: How does the inductance value of 19.6 mH influence operation?
A: It maintains stable current flow across different speeds. This reduces electrical noise during high-frequency switching.
Q: What role does the viscous damping coefficient of 0.0124 Nm/kRPM play in PMB31B-20200-00?
A: It helps minimize oscillations during speed changes. This stabilizes acceleration and deceleration cycles.
