PMB31D-20216-02
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The PMB31D-20216-02 is a NEMA Size 34 brushless servomotor with 8 poles and a typical rated speed of 2350 RPM. Manufactured by Pacific Scientific as part of the PMB Brushless Servomotors series, it features flying leads with MS connectors. This motor operates at 3-phase with a resistance of 5.4 Ohm line-to-line.
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Product Description:
The PMB31D-20216-02 is a NEMA 34 frame size servomotor engineered by Pacific Scientific. It has a total body length of 134.1 mm and its shaft is 12.695 mm in diameter with a square key design. This motor mounts via four 5.59 mm diameter holes on a NEMA-standard flange and it includes double-shielded bearings for reduced contamination and longer life.
The PMB31D-20216-02 motor includes a digital encoder with commutation feedback and its feedback resolution is 4096 pulses per revolution. It has MS-type connectors attached to shielded leads of 457 mm length for both feedback and power connectivity. This motor draws a continuous current of 5.1 A and its resistance between lines is measured as 2 Ohms, while its inductive value stands at 5.2 millihenries. Its peak current utilization is rated at 15.3 A and it generates a torque constant of 0.41 Nm/A, while its back emf for efficient feedback is 0.25 V/krpm. The PMB31D motor comes with a PTC thermistor that is integrated in the winding for protection from over-heating during continuous operations by providing discrete thermal value at all times to the control drive for monitoring. The motor features a rated operational speed of 6000 rev/minute and its viscous damping factor is recorded as 0.0124 Nm/krpm. It weighs about 2.50 kg and possess an inertia of 0.000137 kg·m² with encoder installed.
The PMB31D-20216-02 motor is presented with class F winding insulation and its housing is rated IP40. It uses Neodymium Iron-Boron magnets for higher torque density and its thermal resistance is 1.08 °C/W. The PMB31D motor’s continuous stall turn effect is specified at 2.11 Nm and its typical rated torque during operation at 240 VAC is 1.62 Nm, while its peak torque capacity reaches up to 6.26 Nm.
Frequently Asked Questions about PMB31D-20216-02:
Q: What is the significance of the PTC thermistor in the PMB31D-20216-02 motor?
A: The PTC thermistor in the PMB31D-20216-02 motor helps prevent overheating during continuous use. It provides real-time thermal data to the control drive, ensuring safety and reliable performance.
Q: Why is the PMB31D-20216-02 motor's resistance measured at 2 Ohms?
A: The 2 Ohms resistance in the PMB31D-20216-02 motor optimizes its power consumption and efficiency. It enables the motor to operate smoothly without excessive heat generation.
Q: What is the advantage of Neodymium Iron-Boron magnets in the PMB31D-20216-02?
A: The Neodymium Iron-Boron magnets enhance the torque density in the PMB31D-20216-02 motor. This allows the motor to produce more torque while maintaining a compact size.
Q: How does the viscous damping factor of 0.0124 Nm/krpm benefit the PMB31D-20216-02 motor?
A: The viscous damping factor reduces oscillations in the motor system. This helps in achieving smoother and more precise operations, particularly in high-speed environments.
Q: Why is the thermal resistance of the PMB31D-20216-02 motor rated at 1.08 C/W?
A: A thermal resistance of 1.08 C/W indicates efficient heat dissipation in the PMB31D-20216-02 motor. It ensures the motor operates within safe temperature limits even during continuous operation.
