PMB31B-20214-02
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The PMB31B-20214-02, part of Pacific Scientific's PMB Brushless Servomotors, features a NEMA Size 34 frame and a digital encoder with commutation. It delivers a continuous stall torque of 0.64 Nm and a peak torque of 1.92 Nm. Weighing 1.2 kg, it has an IP40 rating and uses flying leads with MS connectors.
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Product Description:
Pacific Scientific offers the PMB31B-20214-02 Brushless Servomotor for demanding motion control applications. This motor is engineered to deliver precise torque output with reliable long-term performance. It provides a continuous stall torque of 2.11 Nm for steady load handling. The maximum torque capacity is 6.26 Nm to meet peak operational requirements.
The PMB31B-20214-02 Brushless Servomotor has an inertia of 0.137 x 10^-3 kgm^2 which enables fast acceleration and deceleration. The static friction is maintained at 0.09 Nm to ensure a smooth start-up. The viscous damping coefficient of 0.0124 Nm/kRPM supports controlled speed regulation in dynamic applications. The thermal resistance is rated at 1.08 °C/watt to enhance heat dissipation efficiency. A heat dissipation time constant of 28 min provides stable temperature management during operation. The brushless servo motor's weight is 2.5 kg, which supports easy installation without compromising durability. The torque constant is 0.79 Nm/A which allows effective torque generation at optimal current levels. The voltage constant is 0.49 V/rad/sec for dependable voltage-to-speed correlation. The continuous current requirement is 2.66 A, with a maximum torque current of 8 A for short bursts of high load. This servo motor is designed for high efficiency, consistent speed control and dependable operation in industrial environments.
The PMB31B-20214-02 Brushless Servomotor features a resistance of 78.6 ohms and an inductance of 19.6 mH for stable electrical performance. The typical rated speed is 2900 rpm which makes it suitable for high-speed applications. The connector design includes flying leads with MS connectors for secure and reliable electrical connections. A digital encoder with commutation at 2048 ppr is integrated for accurate position and speed feedback. The combination of mechanical stability, accurate sensing and thermal reliability makes the PMB31B-20214-02 servo motor a strong choice for advanced motion control requirements.
Frequently Asked Questions about PMB31B-20214-02:
Q: Why does the PMB31B-20214-02 servo motor use a 2048 PPR encoder?
A: The high-resolution encoder allows for precise feedback on rotor position and speed, essential for closed-loop control in high-accuracy systems.
Q: How does the viscous damping coefficient impact motor performance?
A: The damping coefficient of 0.0124 Nm/kRPM supports smoother speed transitions by reducing oscillations in variable-load conditions.
Q: What benefit does the thermal time constant of 28 minutes provide?
A: The thermal time constant ensures the PMB31B-20214-02 servo motor maintains stable internal temperatures during extended operation, minimizing thermal fatigue and maintaining efficiency.
Q: Why is a torque constant of 0.79 Nm/A important?
A: The PMB31B-20214-02 servo motor converts current into torque efficiently, which means less energy is wasted, and performance remains consistent across varying load demands.
Q: How does low static friction contribute to motor function?
A: The static friction of 0.09 Nm enables smoother motor startup and better response during low-speed movement, critical in precision applications.
