28mm Slotless Brushless DC Motor

Slotless Brushless DC Motor, 28ZWWC52 can avoid the pulsation of air gap magnetic induction caused by uneven magnetic resistance in the teeth.It can eliminate the pulse loss in the armature core and t···

  • Motor Characteristics

Motor part number28ZWWC52
Pole pair11112
Phase resistance(Ω)0.521.
Phase inductance(mH)0.04950.1780.420.770.13
winding connection methodStar shapeStar shapeStar shapeStar shapeStar shape
Insulation classBBBBB
Duty typeS2S2S2S2S1
Feedback methodHall sensorsHall sensorsHall sensorsHall sensorsHall sensors
Commutation angle120°120°120°120°120°
Insulation strength
(Withstand voltage)
Insulation resistance100 MΩ/500VDC100 MΩ/500VDC100 MΩ/500VDC100 MΩ/500VDC100 MΩ/500VDC
Rated voltage(V)1224364824
Rated power(W)3034353537
Rated torque(mN·m)3232323450
Rated speed(RPM)69708430837083407000
Rated current(A)3.131.691.170.862
No load speed(RPM)92709680950094008500
No load current(A)
Motor efficiency(%)8084838581.5

(Ambient noise 20db, 

test distance 1m)(dB)

Case - Environmental thermal resistance (no load)(K/W)0.670.690.730.640.7
Motor thermal time constant (no load)(S)1200120010801100880
Ambient temperature(℃)2324272521.2
Max. winding temperature (no load)(℃)43.247.352.547.446.7
Torque constant(mN·m/A)10.2418.9727.3239.6325
Back-EMF constant - peak value(V/Krpm)1.522.814.045.873.7
Back-EMF constant - effective value(V/Krpm)1.071.992.864.152.62
Peak torque(mN·m)236.31267.87228.72288.25375
Peak current(A)23148715
Inertia moment(g·cm²)
mechanical time constant(ms)5.064.825.884.292.61
End bellStainless steelStainless steelStainless steelStainless steelStainless steel
BearingDeep Groove Ball BearingDeep Groove Ball BearingDeep Groove Ball BearingDeep Groove Ball BearingDeep Groove Ball Bearing
MagnetSinter NdFedBSinter NdFedBSinter NdFedBSinter NdFedBSinter NdFedB
Rotation shaftCarbon SteelCarbon SteelCarbon SteelCarbon SteelCarbon Steel
  • Dimensional Drawing

Brushless DC Motor Size 16mm - images

28mm Slotless BLDC image

  • Torque Performance Curves

  • 1 Pole pair

    16mm Slotless BLDC image

  • 2 Pole pairs

    16mm Slotless BLDC image

  • Options

  • Precision Planetary gearbox

    Precision Planetary gearbox

    Series-1 level2 level3 level4 level
    Total speed ratioX : 13.947 5.30816 21 26 28 3562 83 103 111 138
    150 172 186 231
    243 326 406 439 546 590 679 734
    794 913 987 1135 1227 1526
    Max. continuous torqueN.m1.745.57.3
    Max. Continuous output powerW90603018
    Max. continuous input speedrpm7000800080008000
    Max. efficiency%90807565
    Max. back gap°
    Motor gear hole (ID)mmΦ3 Φ4Φ3 Φ4Φ2 Φ3 Φ4Φ2 Φ3 Φ4
    Gearbox length Lmm24.236.943.550.2