LS Series Brushless Motor

ThinGap’s LS Line of Slotless, Frameless Motor Kits

ThinGap’s LS line targets low speed, high precision applications such as gimbals, optics, and precision robotics.
Highest torque density with high power capability. Low thermal resistance at any speed.

Features Include:

  • Smooth motion with zero cogging and ultra low torque ripple when paired with a sinusoidal drive
  • High peak torque to continuous torque ratio
  • Optimized for ultimate torque density
  • Stationary lamination stack for typical bore mounting
  • 3 phase brushless, sinusoidal waveforms < 1% THD
  • Non-saturating facilitates very high peak torque (typically >4:1)
  • Exceptionally large clear apertures
  • Frame-less kit facilitates deep integration
  • Hall Sensor option available for the LSI 105-33, LSI 152-29, and LSI 267-32
  • Large through hole

Available Products

Average Lead Time: 8-10 weeks
Average Non-Stock Lead Time: 16 weeks


Motor Model Peak Torque* (1 Sec) (N-m)Max Continuous Torque* (N-m)Max Continuous Speed (RPM)Motor Constant (N-m/√W)STEP file
LSI 25-10

LSI 25-16

LSI 25-25
0.044

0.071

0.200
0.016

0.025

0.066
6370

8400

6400
0.008

0.009

0.019
STEP file
STEP file
STEP file
LSI 39-10

LSI 39-17

LSI 39-39
0.105

0.356

1.020
0.033

0.101

0.279
4620

4600

4600
0.014

0.029

0.050
STEP file
STEP file
STEP file
LSI 51-13

LSI 51-25 (Non-Stock)
0.52

1.77
0.14

0.35
3326

3300
0.035

0.073
STEP file
STEP file
LSI 59-13

LSI 59-22
0.73

1.73
0.18

0.38
2840

2800
0.047

0.082
STEP file
STEP file
LSI 75-12

H-LSI 75-12 (Non-Stock)

LSI 75-20

LSI 75-30
1.13

1.36

2.34

5.49
0.29

0.32

0.66

1.04
2500

2500

2500

2500
0.072

0.072

0.120

0.182
STEP file


STEP file
STEP file
LSI 85-134.720.420000.099
LSI 105-337.671.6022700.235STEP file
LSI 130-23

LSI 130-40
12.1

25.5
2.25

4.24
1530

1600
0.396

0.517
STEP file
STEP file
LSI 146-1618.11.4816000.277
LSI 152-29

LSI 152-55 (Non-Stock)
18.4

50.1
3.58

8.36
2000

2200
0.464

0.757
STEP file
STEP file
LSI 224-31

LSI 224-67
71.0

218
8.73

25.5
1300

500
1.09

2.02
LSI 267-32

LSI 267-58
68.1

191
11.54

24.40
2058

2200
1.138

2.119
STEP file
STEP file

Outrunner Architecture


LSO 225-51 Outrunner

LSO 225-66 Outrunner
210.0

106.0
11.35

17.86
920

920
1.223

1.315
STEP file
STEP file
LSO 393-31 Outrunner93.014.472351.311

* Torque values are based on the LS Series motor kits being unmounted. Possible torque values can be up to 10-15% higher when in a housing.

Number designation LSI-XXX indicates O.D. in mm. All motor kit parameters were calculated assuming that the motor kit was not in any form of housing to assist with temperature management. Contact ThinGap for detailed specifications and datasheets. Custom designs are also available.

ThinGap LS Motor vs Alternative Technologies