PMB31B-00116-03
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The PMB31B-00116-03 is a NEMA Size 34 brushless servomotor with flying leads and AMP connectors. Manufactured by Pacific Scientific as part of their PMB Brushless Servomotors series, it delivers a continuous stall torque of 1.70 Nm and an encoder resolution of 4096 ppr. With a peak torque of 4.56 Nm, it weighs 2.9 kg.
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Product Description:
The PMB31B-00116-03 Brushless Servomotor operates on a maximum voltage of 240 volts AC and consumes up to 8 ARMS current at peak torque. This Pacific Scientific motor offers a reliable continuous torque of 1.90 newton meters. It features a high resolution 4096 ppr digital encoder for accurate feedback and smooth communication.
The PMB31B-00116-03 Servomotor can produce maximum turning force before reaching its performance ceiling which makes it able to briefly deliver very high force to accelerate or overcome resistance. This module generates about half a volt in RMS terms which describes the back electromotive force. The motor's physical dimensions follow the NEMA 34 guideline which means its mounting face measures about 3.4 inches. The servo motor rotors shaft features a flat edge which helps couplings, gears or pulleys by preventing slippage under torque loads. It will consume about 2.7 amps RMS if it is prevented from rotating but voltage is still applied. The module commonly reaches a speed close to 2900 rpm when connected to a 240 volts alternating current system or an equivalent 320 volts direct current supply. It has loose cable ends that are pre fitted with AMP style plugs rather than a fixed terminal block.
The PMB31B-00116-03 Servomotor rotating part possesses a moment of inertia measured at 0.137 kgm² × 10⁻³ which makes it highly responsive for precision industrial automation operations. It includes a seal around the shaft to block dust and contaminants and a PTC thermistor that acts as a temperature sensor to protect against overheating. Its coil arrangement inside it is designated as B type which influences torque output, speed range and voltage characteristics.
Frequently Asked Questions about PMB31B-00116-03:
Q: How much current is typically required to reach maximum torque in the PMB31B-00116-03?
A: Reaching maximum torque requires higher current draw, so system wiring and drive selection must accommodate peak levels. Oversized cables or underspecified drives may cause overheating or shutdown.
Q: What is the effect of using a high-resolution 4096 ppr encoder in real applications?
A: Using a high-resolution 4096 ppr encoder enables precise position and speed feedback, enhancing motion accuracy in real applications. This results in smoother motor control, better responsiveness, and improved performance in automation tasks.
Q: Can this servo motor run continuously at its peak torque rating?
A: No, peak torque is meant for short bursts only. Continuous operation at that level would cause excessive heat and reduce motor lifespan.
Q: Why is the stack length multiple important in the PMB31B-00116-03?
A: It directly affects torque density without altering the mounting footprint. A single stack keeps the motor compact, making it easier to fit into space-constrained systems.
Q: How does voltage limitation affect drive selection?
A: The drive must not exceed the rated maximum supply, otherwise insulation or winding damage may occur. Matching voltage ensures long-term reliability and prevents premature breakdown.
