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  • Brushless DC Motors & Matching Drives
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21BF NUVODISC

Portescap

Slotless Brushless DC Flat Motor

Windingunit21BF 3C K .02
Diametermm 21
Lengthmm 10.55
Nominal VoltageVolt 5.0
Optimization Speed  n.a.
No-Load Speedrpm 3,900
Typical No-Load CurrentmA 28
Max continuous mechanical power (@ 25°C)W 4.0
Max continuous CurrentA 0.3
Max Continuous TorquemNm 2.70
Back-EMF ConstantV/1000 rpm 0.89
Torque ConstantmNm/A 8.50
Motor Constant k/R½mNm/W½ 1.1
Internal resistance - phase to phaseΩ 56.30
Line to Line resistance at connectorsΩ 56.30
Inductance - phase to phasemH 1.22
Mechanical Time Constantms 141.2
Electrical time constantms 0.02
Max motor speedrpm 25,000
Ambient working temperature range°C -30 /+80
Ambient storage temperature range°C -40/+80
Ball bearings preloadN 2.7
Axial static force without shaft supportN 27
Max winding temperature°C 125
Thermal Resistance°C/W 12
Thermal Time Constant°C/W 200
Weightg 10
Rotor Inertiagcm² 1.8
Typical Housing Material  Plastic