PMB33F-20200-02
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The PMB33F-20200-02 servomotor boasts a planetary gearbox design, output torque of 200 Nm, an efficiency of up to 97%, and weighs 7.5 kg. Part of the PMB Brushless Servomotors series by Pacific Scientific, it features IP65 protection and supports input power up to 2 kW with minimal noise levels of ≤ 65 dB.
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Product Description:
The PMB33F-20200-02 Servo motor from Pacific Scientific is designed with a length of 21.3 cm. It possesses a 1.27 cm thick shaft with a mechanical keyed configuration and it measures 2.54 cm in length for standard coupling with industrial machines. This motor weighs 6.3 kg and its moment of inertia is rated as 0.000404 kgm² to tackle high-speed motions in a controlled way.
The PMB33F-20200-02 motor includes a PTC thermistor for over-temperature monitoring and its thermal resistance is 0.780°C/W. Its viscous damping coefficient is 0.0380 Nm/krpm and it is constructed with IP40 basic environmental protection. The unit achieves cooling is achieved via natural convection and heat sinking. Its power cable is 45.7 cm in length and uses shielded 18 AWG wire, while its feedback cable also measures 45.7 cm and uses shielded 26 AWG wire with a minimum cable bend radius of 5.72 cm. The PMB motor provides a steady torque of 5.420 Nm and its peak torque output reaches a value of 16.10 Nm for dynamic applications. Its rated torque is 4.040 Nm at 4600 r/min of operating speed and it draws a continuous stall current of 9 A, while its peak current requirement can go up to 27.10 A. This PMB33F motor produces a turning effect constant of 0.60 Nm per every ampere usage and it generates a constant voltage of 0.370 V/rad/sec.
The PMB33F-20200-02 motor uses feedback that is dependent on resolver system for motion and positional monitoring. It operates on a 240 VAC source supply and its internal mutual induction happens through the eight pole pairs of magnets for steady torque delivery. The PMB33F motor’s line-to-line impedance measures 0.96 Ohms and its minimum inductive value is specified as 2.80 mH between two phases.
Frequently Asked Questions about PMB33F-20200-02:
Q: How does the resolver feedback in the PMB33F-20200-02 improve positional accuracy?
A: The resolver generates precise electrical signals that correspond to shaft angle, allowing closed-loop control with minimal drift. This ensures repeatable positioning, particularly critical in high-speed automation.
Q: Why is the 0.78 °C/W thermal resistance significant for the PMB33F-20200-02?
A: Low thermal resistance means heat dissipates effectively via the housing, reducing thermal buildup during continuous operation. Consequently, the motor maintains stability under sustained loads without external cooling.
Q: What advantage does the 45.7 cm shielded cable length offer in the PMB33F-20200-02?
A: Extended, shielded cabling minimizes electromagnetic interference from nearby equipment and provides installation flexibility in confined control cabinets. It also supports reliable signal integrity for feedback and power.
Q: How does the viscous damping coefficient influence performance in the PMB33F-20200-02?
A: The 0.038 Nm/krpm damping slows transient oscillations, smoothing start-stop motion and reducing mechanical resonance. This enhances control during abrupt speed changes.
Q: How does the PTC thermistor in the PMB33F-20200-02 respond to overheating?
A: The PTC increases resistance sharply when critical temperature is reached, triggering driver shutdown or alert. This feature prevents thermal damage in over-temperature scenarios.
