SP28ZWWC52 28 mm Brushless Coreless DC Motor

Coreless DC Brushless Motor (General Industrial)
The SP28ZWWC52 is a 28 mm brushless coreless DC motor with 12 to 48 V winding options, 32 to 50 mN·m rated torque and rated speeds up to 8,430 rpm for compact precision drive systems.
SP28ZWWC52 28 mm brushless coreless DC motor

Technical details

Further information

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Positioning accuracy

High torsional rigidity and constant torsional backlash over the entire gearbox service life ensure consistently high performance

Compactness

High torque density thanks to high performance and short design

Low maintenance

Highest quality standards for a long service life and extended maintenance intervals

Technical data

28 mm brushless coreless DC motor

Smooth brushless performance in a compact 28 mm frame

The SP28ZWWC52 28 mm brushless coreless DC motor uses a slotless rotor structure and Hall feedback for responsive electronic commutation. Five verified winding configurations cover 12 to 48 V operation for compact precision drive systems.

28 mm

Compact motor diameter

The cylindrical 28 mm frame supports equipment with constrained installation space.

8,430 rpm

Fast rated operation

Available windings reach rated speeds up to 8,430 rpm while retaining smooth response.

50 mN·m

Rated torque range

The two-pole-pair 24 V configuration provides up to 50 mN·m rated torque.

Engineering data

Electrical and mechanical specifications

28 mmMotor size
12–48 VRated voltage
32–50 mN·mRated torque
6,970–8,430 rpmRated speed
Motor selection

SP28ZWWC52 winding specifications

Parameter Unit 28ZWWC52 / 12 V 28ZWWC52 / 24 V 28ZWWC52 / 36 V 28ZWWC52 / 48 V 28ZWWC52 / 24 V (2 pole pairs)
Pole pairs — 1 1 1 1 2
Phase resistance Ω 0.52 1.7 4.3 6.6 1.6
Phase inductance mH 0.0495 0.178 0.42 0.77 0.13
Winding connection — Star Star Star Star Star
Insulation class — B B B B B
Duty cycle — S2 S2 S2 S2 S2
Feedback — Hall elements Hall elements Hall elements Hall elements Hall elements
Commutation angle — 120° 120° 120° 120° 120°
Dielectric strength — 500 VAC / 1 kHz / 1 mA / 1 s 500 VAC / 1 kHz / 1 mA / 1 s 500 VAC / 1 kHz / 1 mA / 1 s 500 VAC / 1 kHz / 1 mA / 1 s 500 VAC / 1 kHz / 1 mA / 1 s
Insulation resistance — 100 MΩ / 500 VDC 100 MΩ / 500 VDC 100 MΩ / 500 VDC 100 MΩ / 500 VDC 100 MΩ / 500 VDC
Weight g 170 170 170 170 170
Rated voltage V 12 24 36 48 24
Rated power W 30 34 35 35 37
Rated torque mN·m 32 32 32 34 50
Rated speed rpm 6,970 8,430 8,370 8,340 7,000
Rated current A 3.13 1.69 1.17 0.86 2
No-load speed rpm 9,270 9,680 9,500 9,400 8,500
No-load current A 0.2 0.11 0.084 0.061 0.12
Motor efficiency % 80 84 83 85 81.5
Noise dB <50 <50 <50 <50 <50
Thermal resistance K/W 0.67 0.69 0.73 0.64 0.7
Thermal time constant s 1,200 1,200 1,080 1,100 880
Ambient temperature °C 23 24 27 25 21.2
Maximum winding temperature °C 43.2 47.3 52.5 47.4 46.7
Torque constant mN·m/A 10.24 18.97 27.32 39.63 25
Back-EMF constant, peak V/Krpm 1.52 2.81 4.04 5.87 3.7
Back-EMF constant, effective V/Krpm 1.07 1.99 2.86 4.15 2.62
Peak torque mN·m 236.31 267.87 228.72 288.25 375
Peak current A 23 14 8 7 15
Rotor inertia g·cm² 10.2 10.2 10.2 10.2 10.2
Mechanical time constant ms 5.06 4.82 5.88 4.29 2.61
End cap — Stainless steel Stainless steel Stainless steel Stainless steel Stainless steel
Bearing — Deep-groove ball bearing Deep-groove ball bearing Deep-groove ball bearing Deep-groove ball bearing Deep-groove ball bearing
Magnet — Sintered NdFeB Sintered NdFeB Sintered NdFeB Sintered NdFeB Sintered NdFeB
Shaft — Carbon steel Carbon steel Carbon steel Carbon steel Carbon steel
Technical drawings

Dimensions and performance characteristics

SP28ZWWC52 28 mm brushless coreless DC motor dimensions
Motor dimensions, shaft geometry, mounting features and lead arrangement.
Efficiency (%)Current (A)Output power (W)Speed (r/min)
2 pole pairs · 24 VDC

SP28ZWWC52 24 V two-pole-pair performance curve

24 V two-pole-pair efficiency, current, output power and speed characteristics over torque.
Efficiency (%)Current (A)Output power (W)Speed (r/min)
1 pole pair · 36 VDC

SP28ZWWC52 36 V one-pole-pair performance curve

36 V one-pole-pair efficiency, current, output power and speed characteristics over torque.
Compact motion

Coreless construction for rapid and smooth response

The slotless magnetic circuit reduces cogging-related torque pulsation, while low rotor inertia supports fast acceleration and deceleration. Hall feedback and 120-degree commutation simplify integration with compatible brushless controllers.

  • Five verified 12 to 48 V winding configurations
  • Hall-element feedback with 120-degree commutation
  • Deep-groove ball bearings and stainless-steel end cap
SP28ZWWC52 28 mm brushless coreless DC motor
Application areas

Precision equipment requiring compact responsive motion

01

Medical equipment

Compact pumps and instruments requiring smooth, responsive brushless drive.

02

Robotics

Small joints, grippers and mobile mechanisms with constrained diameter.

03

Precision instruments

Low-noise actuation for optical, laboratory and measurement equipment.

04

Miniature servo systems

Fast follow-up motion in compact positioning and automation assemblies.

Integration data

Selection and installation information

Select the winding according to supply voltage, required torque-speed point, duty cycle, controller and thermal environment.

SeriesSP28ZWWC52
Frame diameter28 mm
Rated voltage range12–48 VDC
Rated operating range32–50 mN·m at 6,970–8,430 rpm
DutyS2
FeedbackHall elements
Winding connectionStar

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SP28ZWWC52 28 mm Brushless Coreless DC Motor
The SP28ZWWC52 is a 28 mm brushless coreless DC motor with 12 to 48 V winding options, 32 to 50 mN·m rated torque and rated speeds up to 8,430 rpm for compact precision drive systems.

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