Series-Elastic Joint Drive

Assembly

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Motor-gearbox with a torsion spring in series whose deflection measures output torque.

Direct parts	5
Total parts	29
Used in	4 assemblies
Class	Assembly

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Motor-gearbox with a torsion spring in series whose deflection measures output torque. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Series-Elastic Joint Drive parts and their functions

5 top-level parts · 29 parts in total · full bill of materials below

Series-Elastic Joint Drive parts diagram: 1 servo motor, 2 helical gear pair, 3 torsion spring element, 4 encoder, 5 gearbox housing. 29 parts in 5 top-level items. — Series-Elastic Joint Drive parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.

#	Part	Qty	What it does
1	Servo Motor 4 parts	1×	Frameless drive motor
2	Helical Gear Pair	1×	Low-ratio reduction
3	Torsion Spring Element	1×	Series elastic element
4	Encoder	2×	Motor + output side
5	Gearbox Housing	1×	Rigid cast housing that holds the gears and bearings in alignment, contains the lubricant, and mounts the gearbox to the machine.

3D model

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Build & assembly graph

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Bill of materials for Series-Elastic Joint Drive

5 top-level lines · 16 rows shown · 29 parts total · indented to 3 levels

#	Item / sub-assembly	Part no.	Qty/assy	Ext. qty	Parts	Type
1	Servo Motor 4 parts	servo-motor	1×	1	24	assembly
1.1	Stator Assembly 3 parts	stator-assembly	1×	1	3	assembly
1.1.1	Stator Core (laminations)	stator-core	1×	1	·	part
1.1.2	Copper Winding	copper-winding	1×	1	·	part
1.1.3	Slot Insulation	stator-insulation	1×	1	·	part
1.2	Rotor Assembly 4 parts	rotor-assembly	1×	1	19	assembly
1.2.1	Rotor Shaft	rotor-shaft	1×	1	·	part
1.2.2	Rotor Core	rotor-core	1×	1	·	part
1.2.3	Neodymium Magnet	neodymium-magnet	16×	16	·	part
1.2.4	Ball Bearing	ball-bearing	1×	1	·	part
1.3	Encoder	encoder	1×	1	·	part
1.4	Motor Housing	motor-housing	1×	1	·	part
2	Helical Gear Pair	gear-pair	1×	1	·	part
3	Torsion Spring Element	rehabilitation-robot-arm-torsion-spring	1×	1	·	part
4	Encoder	encoder	2×	2	·	part
5	Gearbox Housing	gearbox-housing	1×	1	·	part

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Where the series-elastic joint drive is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Medical Devices 1 Rehabilitation Robot Arm

Used in 4 assemblies

Shoulder Gimbal Elbow Joint Wrist Module Actuation System

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $0.50–$100. How estimates work

Vendor	HQ	Specialty	MOQ	Lead time
🇨🇳Foxconn foxconn.com ↗	Shenzhen, CN	Electronics contract mfg	1,000 pcs	6–10 wks
🇸🇬Flex (Singapore) flex.com ↗	Singapore	Electronics contract mfg	1,000 pcs	6–10 wks
🇮🇳Dixon Technologies dixoninfo.com ↗	Noida, IN	Electronics contract mfg	1,000 pcs	6–10 wks
🇨🇳BYD Electronics bydelectronic.com ↗	Shenzhen, CN	Electronics contract mfg	1,000 pcs	6–10 wks
🇸🇬Venture Corp venture.com.sg ↗	Singapore	Electronics contract mfg	1,000 pcs	6–10 wks