HAITAI WK-H Frameless Brushless Motors

Overview

The HAITAI WK-H series consists of frameless brushless motors with an outer rotor and a separate wound stator. The hollow center and low-profile geometry allow the motor to be integrated into a custom rotary assembly. Select the exact model and magnet version for your voltage, torque, speed and installation space.

Features

Separate rotor and stator for integration into custom mechanisms.
12 V, 24 V and 36 V models with individual electrical specifications.
Ring-magnet and segmented-magnet configurations where listed.
Hollow stator center provides space for mechanical integration.
Original model drawings and a full parameter comparison support selection.

Specifications

Model / Version	Rated V	Rated A	Rated torque (N·m)	Rated rpm	Max rpm	Net weight (g)
WK1105H (ring magnet)	12	0.59	0.01	850	18057	4
WK1806H	12	0.66	0.03	800	5017	12
WK2205H (ring magnet)	12	0.66	0.02	792	5630	12
WK2205H (segmented magnets)	12	0.66	0.04	792	5630	14
WK2806H	12	0.81	0.06	950	2335	22
WK3505H	12	1.1	0.09	467	1610	32
WK3510H	12	0.53	0.11	363	965	47
WK4310H	24	0.9	0.2	504	1028	78
WK4315H	24	0.59	0.28	238	660	110
WK5215H (ring magnet)	24	1.24	0.41	140	557	167
WK5225H (ring magnet)	24	1.54	0.57	110	428	281
WK5515H	Confirm fit against drawing	1.6	0.65	264	558	196
WK6010H-11	36	1.3	0.8	294	564	156
WK6025H	36	7.4	1.77	504	720	345
WK8110H	24	2.49	1	349	566	206
WK8115H-G	24	5.8	1.1	954	1146	313
WK8115H-D	36	2.1	1.26	372	534	313
WK10025H	36	3.8	4	168	330	576

Rated values and maximum speed describe different operating points. Stall torque/current are not continuous ratings. Working temperature: −20 to 80°C. Maximum magnet temperature: 120°C; this is a magnet limit, not a recommended ambient operating temperature.

Electrical and Motor Constants

Model	Stall N·m	Stall A	Turns	Phase Ω	Phase mH	rpm/V	N·m/A	Inertia g·cm²	Pole pairs
WK1105H (ring magnet)	0.01	0.92	50	12.5	1.15	1505	0.01	1	6
WK1806H	0.06	1	45	5.64	1.06	418	0.06	6	7
WK2205H (ring magnet)	0.06	1	65	7.4	1.68	469	0.06	5	7
WK2205H (segmented magnets)	0.12	1	65	7.4	1.68	469	0.12	9	7
WK2806H	0.09	1.22	60	5.13	1.64	195	0.07	36	7
WK3505H	0.15	1.9	40	6.56	1.27	134	0.08	51	11
WK3510H	0.16	0.8	40	8.53	1.9	80	0.2	76	11
WK4310H	0.49	1.9	60	10.32	4.76	43	0.23	161	14
WK4315H	0.42	0.9	60	13.84	6.45	28	0.47	223	14
WK5215H (ring magnet)	0.53	1.56	60	14.09	8.98	23	0.35	338	11
WK5225H (ring magnet)	0.77	1.94	50	11.36	10.04	18	0.42	561	11
WK5515H	1.26	3.2	42	5.62	3.98	23	0.43	456	14
WK6010H-11	1.59	2.7	80	10.28	12.35	16	0.61	514	14
WK6025H	2.68	10.67	30	3.35	3.2	20	0.23	1069	14
WK8110H	2.4	6.51	30	2.29	2.32	24	0.39	1716	21
WK8115H-G	5.17	33.1	8	0.35	0.25	48	0.19	2368	21
WK8115H-D	4.11	6.6	30	3.81	3.27	15	0.67	2368	21
WK10025H	8.5	16	20	3.06	3.03	9	1.03	6447	21

Mechanical Selection

Model	Stator inner diameter (mm)	Diameter × height (mm)
WK1105H (ring magnet)	5	14.9 x 6.25
WK1806H	9	22 x 8.5
WK2205H (ring magnet)	10	25.3 x 6.2
WK2205H (segmented magnets)	10	26.3 x 9
WK2806H	14	34.6 diameter; confirm axial clearance against drawing
WK3505H	22	40 x 9.5
WK3510H	22	40 x 13.7
WK4310H	25	49 x 13.5
WK4315H	25	49 x 18.5
WK5215H (ring magnet)	24	58.6 x 19
WK5225H (ring magnet)	24	58.6 x 29
WK5515H	Confirm fit against drawing	60 diameter; confirm overall clearance against drawing
WK6010H-11	36	68 x 15.5
WK6025H	35.5	68 x 30.5
WK8110H	58.5	90 x 14
WK8115H-G	Confirm revision-specific fit	90 x 19
WK8115H-D	Confirm revision-specific fit	90 x 19
WK10025H	78	109 x 33

Dimensions are in millimeters. Use the relevant full drawing for tolerances and mounting layout. WK6010H-11 uses WK6010H family reference data here; verify the exact revision before machining. Confirm mating fits for WK4315H and WK8115H-G/D before making mounting parts.

Small Chinese fitting notes on the drawings refer to recommended mating dimensions and adhesive bonding. Confirm these auxiliary fits before machining. For WK2806H and WK5515H, confirm the overall axial clearance against the detailed drawing rather than relying on a nominal size alone.

What's Included

One rotor-and-stator motor set in the selected model/version. A controller, encoder, bearings, shaft and finished housing are not included in these listed motor sets. The builder supplies the drive electronics and mechanical support.

Applications

For integration into compact gimbals, LiDAR rotary mechanisms, laser-welding rotary assemblies and custom positioning platforms. Select the motor and driver together, allowing for load, thermal conditions and mounting tolerances.

FAQ

Is this a ready-to-run motor with a shaft and bearings?

No. It is a frameless rotor-and-stator set that requires a supported mechanical assembly and suitable brushless motor driver.

What is the difference between ring and segmented magnets?

The ring version uses a continuous multipole magnetic ring. The segmented version uses individual magnets inside a steel rotor ring. WK2205H offers both versions, with different dimensions and torque ratings.

Are WK8115H-G and WK8115H-D interchangeable?

No. G is the 24 V higher-speed version; D is the 36 V lower-speed version. Their motor constants and operating points differ, so match the controller and load to the selected version.

What does the model code mean?

In the WK1105H naming example, WK identifies the frameless series, 11 denotes the nominal iron-core diameter in millimeters, 05 denotes nominal core thickness, and H identifies HAITAI. The code does not replace the complete mounting drawing.