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specifications_21bf

Product catalog summary
Overview: This document provides technical specifications for the Portescap Brushless DC Flat Motors, specifically the 21BF nuvoDisc™ model with a diameter of 21 mm and 8 poles, delivering 4 W of power.
Specifications:
  • Nominal Voltage: 5 Volt
  • No Load Speed: 3,900 rpm
  • Typical No Load Current: 28.0 mA
  • Max Continuous Mechanical Power: 4.0 W
  • Max Continuous Current: 0.3 A
  • Max Continuous Torque: 2.7 mNm (0.39 oz-in)
  • Back EMF Constant: 0.89 V/1000 rpm
  • Torque Constant: 8.5 mNm/A
  • Internal Resistance: 56.30 ohms
  • Inductance Phase to Phase: 1.22 mH
General Data:
  • Maximum Motor Speed: 25,000 rpm
  • Ambient Working Temperature Range: -30 to +80 °C (-22 to +176 °F)
  • Ambient Storage Temperature Range: -40 to +80 °C (-40 to +176 °F)
  • Ball Bearings Preload: 2.70 N
  • Axial Static Force w/o Shaft Support (max): 27.00 N
  • Maximum Winding Temperature: 125 °C (257 °F)
  • Thermal Resistance: 12.00 °C/W
  • Weight: 10 g (0.36 oz)
  • Rotor Inertia: 1.80 g-cm²
Performance Graphs: The document includes graphs illustrating the relationship between torque and speed, as well as no-load speed versus power supply voltage, highlighting maximum continuous operation at 25°C.
Wire Description: The motor includes three phases and a center point for Y winding, operating sensorless.
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Catalog excerpts

specifications_21bf-1

Brushless DC Flat Motors 21BF nuvoDisc™ Max length available for screw : 5mm Dimensions in mm Electrical Data Nominal Voltage Optimization Direction No Load Speed Typical No Load Current Max Continuous Mechanical Power (@25°C) Max Continuous Current Max Continuous Torque Back EMF Constant Torque Constant Motor Regulation Motor Regulation Internal Resistance - phase to phase Line to Line Resistance at Connectors Inductance Phase to Phase Mechanical Time Constant Electrical Time Constant Volt rpm mA W A mNm (oz-in) V/1000 rpm mNm/A 103/Nms mNm/W½ (oz-in/W½) ohms ohms mH ms ms General Data Maximum Motor Speed Ambient Working Temperature Range Ambient Storage Temperature Range Ball Bearings Preload Axial Static Force w/o Shaft Support (max) Maximum Winding Temperature Thermal Resistance Thermal Time Constant Weight Rotor Inertia Hall Sensor Electrical Phasing (Sensorless) center point of Y winding Torque (oz-in) Power supply voltage (V) No load speed for each coil

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