PMB33E-20200-02 Pacific Scientific
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The Pacific Scientific PMB33E-20200-02 is a brushless servomotor from the PMB Brushless Servomotors series. It features a NEMA Size 34 frame, a square key shaft design, and flying leads with MS connectors. This servomotor uses a resolver sensor type, has a PTC thermistor for customization, and offers a nominal stall current of 7.4 ARMS at 240Vac maximum.
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Product Description:
The PMB33E-20200-02 is a brushless servomotor produced by Pacific Scientific and included in the PMB Brushless Servomotors series. It is intended for precision motion tasks where repeatable speed and position control are required, such as on indexing tables or small gantry axes. The motor’s electronic commutation scheme removes carbon brushes from the design, reducing maintenance and allowing consistent torque delivery over long duty cycles. A built-in feedback device continuously reports shaft angle to the drive electronics so closed-loop regulation can be sustained across a full speed range without losing synchronization.
The mechanical envelope corresponds to NEMA Size 34, meaning the 3.4-inch square face can bolt directly to standardized gearheads or mounting plates. Under locked-rotor conditions, it draws a nominal stall current of 7.4 ARMS from a 240 VAC drive, a value used when sizing fuses and planning thermal management. Power and feedback leave the housing through flying leads with MS connectors, and this hybrid arrangement speeds field wiring while preserving environmental sealing at the motor. Rotor position is detected by a resolver, giving analog sine-cosine signals that remain accurate in high-temperature or high-vibration zones where optical encoders can drift. Torque is transferred through a square key machined into the shaft, ensuring positive engagement with couplings or pulleys and eliminating slippage during rapid acceleration.
Thermal supervision is provided by a built-in PTC Thermistor. When winding temperature rises to its calibrated threshold, the drive can throttle current to protect insulation. Output torque is increased by the motor’s stack length multiple of 3, which adds lamination sections without changing frame diameter. This raises magnetic flux and increases inertia for smoother velocity regulation. The brushless architecture minimizes electrical noise and extends service intervals. As a servomotor, it is suitable for applications that demand rapid reversals and precise dwell positioning.
Frequently Asked Questions about PMB33E-20200-02:
Q: What type of connectors are used on the PMB33E-20200-02 servomotor?
A: This model uses flying leads with MS connectors for electrical connections.
Q: Does the PMB33E-20200-02 servomotor include any thermal protection features?
A: The PMB33E-20200-02 features a PTC thermistor as a built-in customization for temperature monitoring.
Q: What is the motor size of the Pacific Scientific PMB33E-20200-02?
A: This servomotor is built to NEMA Size 34 dimensions.
Q: What is the nominal stall current of the PMB33E-20200-02 at 240Vac?
A: The nominal stall current at 240Vac max for this motor is rated at 7.4 ARMS.
Q: What shaft design does the PMB33E-20200-02 servomotor have?
A: The shaft features a square key design for mechanical coupling purposes.
