Brushless Servo Motors

ULTRA COMPACT SERVO MOTORS

  • Up to 30% increased power density
  • Up to 20% reduced dimensions  
  • Sophisticated design, intended for extreme torque stability and precision

TECHNICAL DATA

Motor Type

B71.21U 21.5 Nm - 3000 rpm - 10 poles - 400V

PERFORMANCE DATA

Type Stall torque (Δt=105°C) Mo Nm Rated speed n rpm Rated power Pn kW Rated torque (Δt=105°C) Mn Nm Peak torque Mpk Nm Max speed nmax rpm Moment of inertia J 10⁻⁴ Kgm² Thermal time constant Tth min Voltage constant ke Vs Torque constant kt Nm/A Resistance phase to phase (20°C) Rw Ω Inductance phase to phase Lw mH B.E.M.F. @ rated speed En Vrms Stall current Io Arms Rated current In Arms Peak current Ipk Arms Connection type/sizeWeight kg
B71.21U 21.5 3000 4.6 14.80 63.0 5000 12.9 42 0.94 1.63 0.52 7.1 296 13.2 9.1 51.9 7/115.2

Mechanical Data

Design Aluminium
Degree of protection IP 65
Bearings DE 6205
Bearings NDE 6203
Lubrication grease low & high temperature grease
Regreasing device permanent lubrication
Cooling radiation and natural convection
Vibration Level A (normal)

Electrical Data

Voltage400V
Poles10
Thermal protection threshold Θmax °C140

DIMENSIONS

  • B71U
DIMENSIONSSquare flange mmMax length with resolver mmMax length with encoder mm Centering diameter ∅ CD mmBolt circle diameter ∅ BC mmShaft diameter ∅ SD mmShaft length SL mmFan Kit square mm
B71U142149160130j616524j650na
PRODUCT DOCUMENTATIONSPRODUCT CERTIFICATIONS
Certificate of Conformity UL - PM Motors
Declaration of Conformity EU - Servo Motors
Declaration WEEE Lafert Servo Motors S.p.A.
General Terms & Conditions of Sales - Lafert S.p.A.

Industries

Contact Us

Lafert S.p.A.
Via J.F. Kennedy 43
30027 San DonĂ  di Piave
Venice - Italy

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