21BF 3C K .02

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21BF 3C K .02

The 21BF nuvoDisc brushless DC slotless motor utilizes 6 self supporting ironless coils. The 21BF mini motor offers long life, excellent speed and position control and smooth rotation. Using a disc magnet design, it has no iron losses and a flat shape.

With or without hall sensors
8 poles
Compact design
No iron losses
High efficiency
Flat design
3 phases
Shaft lengths
Special coils
Cables and connectors
Value added mounting

Part Number 21BF3CK.02_slotless
Diameter, in 0.83
Length, in 0.42
Nominal Voltage, Volt 5.0
Optimization Speed No
No-Load Speed, rpm No
Typical No-Load Current, mA No
Max continuous mechanical power (@ 25°C) No
Max continuous Current, A 0.3
Max Continuous Torque,oz-in 0.38
Back-EMF Constant, V/1000 rpm 0.89
Torque Constant, oz-in/A 1.20
Motor constant k/R½, oz-in/W½ 0.16
Internal resistance - phase to phase, Ohm 56.30
Line to Line resistance at connectors, Ohm 56.30
Inductance - phase to phase, mH 1.22
Mechanical Time Constant, ms 141.2
Electrical time constant, ms 0.02
Max motor speed, rpm No
Ambient working temperature range, °F No
Ambient storage temperature range, °F No
Ball bearings preload, N 2.7
Axial static force without shaft support, N 27
Max winding temperature, °F 257, 257
Thermal Resistance, °C/W 12
Thermal Time Constant, °C/W 200
Weight Oz 0.35
Rotor Inertia, gcm² 1.8
Typical Housing Material No
Hall Sensor Elecrical Phasing, electrical° No
Motor Regulation R/k², 10³/Nms No
Company Portescap