PMB31B-20214-01 Pacific Scientific
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The Pacific Scientific PMB31B-20214-01 is a brushless servomotor in the PMB Brushless Servomotors series with a NEMA Size 34 frame and a square key shaft design. It features a digital encoder with commutation, offering 2048 pulses per revolution, and has flying leads with MS connectors. The motor has a nominal stall current of 2.7 ARMS at 240V AC and includes a shaft seal customization.
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Product Description:
The PMB31B-20214-01 is a brushless servomotor manufactured by Pacific Scientific for the PMB Brushless Servomotors series. It supplies commanded torque and position feedback to industrial axes that demand repeatable motion, such as carton erectors, small gantries, and electronics assembly tables. Its permanent-magnet design supports dynamic acceleration while keeping heat generation low in tightly packed machines. This combination makes the motor suitable for applications that need responsive motion without adding unnecessary bulk to the drive system.
With a frame conforming to NEMA Size 34, the motor bolts to the common 3.4-inch square pattern used by many stepper mounts. The windings tolerate a continuous stall draw of 2.7 ARMS when operated from a 240 VAC amplifier, which sets the drive sizing threshold for holding or low-speed conditions. Rotor position is measured by an optical device that produces 2048 ppr, and these counts allow precise interpolation at sub-degree resolution. Because the sensor is a digital encoder with commutation, it also generates phase-aligned signals so the drive can energize the stator without separate Hall boards. Power and feedback leave the housing through flying leads with MS connectors, combining flexible cable tails with screw-coupled shells for secure field wiring and straightforward routing in compact equipment.
A square key is machined into the output shaft, providing positive torque transfer to pulleys or couplings without relying on friction alone. The motor is fitted with a shaft seal that helps protect the front bearing from splashed fluids and fine particulates during operation. Its active magnetic length uses a stack length multiple of 1, which keeps the motor compact and supports high start-stop duty cycles by limiting rotor inertia. Pacific Scientific identifies the unit as a PMB Series brushless servomotor, indicating that it belongs to the same product line as related motors that use matching electrical and mechanical formats. The overall layout is suited to motion systems where accurate feedback, stable coupling, and compact installation space are all important.
Frequently Asked Questions about PMB31B-20214-01:
Q: What type of connector does the PMB31B-20214-01 servomotor use?
A: This motor uses flying leads with MS connectors for electrical connections.
Q: Does the PMB31B-20214-01 servomotor come with a shaft seal?
A: A shaft seal is included on this model for added protection.
Q: What is the encoder resolution on the PMB31B-20214-01 motor?
A: The included encoder provides a resolution of 2048 pulses per revolution.
Q: What NEMA size is the PMB31B-20214-01 servomotor?
A: This servomotor is built to the NEMA Size 34 standard.
Q: What is the shaft design of the PMB31B-20214-01 servomotor?
A: The shaft on this motor uses a square key design for mechanical coupling.
