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Joint Actuator

Assembly

A quasi-direct-drive module pairing a high-torque BLDC motor with a single-stage planetary reduction for backdrivable torque control. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Joint Actuator parts and their functions

8 top-level parts · 74 parts in total · full bill of materials below
Joint Actuator parts diagram: 1 stator assembly, 2 rotor assembly, 3 neodymium magnet, 4 planetary gearset, 5 motor housing, 6 ball bearing, 7 encoder, 8 actuator driver board. 74 parts in 8 top-level items.
Joint Actuator parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Stator Assembly 3 parts 1× Concentrated-winding stator
2 Rotor Assembly 4 parts 1× Outer rotor
3 Neodymium Magnet 28× Rotor poles
4 Planetary Gearset 4 parts 1× ~9:1 reduction
5 Motor Housing 1× Cast or extruded aluminium shell that carries the stator, locates the bearings, and conducts heat away from an electric motor.
6 Ball Bearing 2× Rotor support
7 Encoder 2× Motor + output absolute encoders
8 Actuator Driver Board 5 parts 1× Integrated FOC driver

3D model

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Build & assembly graph

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Bill of materials for Joint Actuator

8 top-level lines · 24 rows shown · 74 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Stator Assembly 3 parts stator-assembly 1× 1 3 assembly
1.1 Stator Core (laminations) stator-core 1× 1 · part
1.2 Copper Winding copper-winding 1× 1 · part
1.3 Slot Insulation stator-insulation 1× 1 · part
2 Rotor Assembly 4 parts rotor-assembly 1× 1 19 assembly
2.1 Rotor Shaft rotor-shaft 1× 1 · part
2.2 Rotor Core rotor-core 1× 1 · part
2.3 Neodymium Magnet neodymium-magnet 16× 16 · part
2.4 Ball Bearing ball-bearing 1× 1 · part
3 Neodymium Magnet neodymium-magnet 28× 28 · part
4 Planetary Gearset 4 parts quadruped-robot-planetary-gearset 1× 1 8 assembly
4.1 Sun Gear quadruped-robot-sun-gear 1× 1 · part
4.2 Planet Gear quadruped-robot-planet-gear 3× 3 · part
4.3 Ring Gear quadruped-robot-ring-gear 1× 1 · part
4.4 Ball Bearing ball-bearing 3× 3 · part
5 Motor Housing motor-housing 1× 1 · part
6 Ball Bearing ball-bearing 2× 2 · part
7 Encoder encoder 2× 2 · part
8 Actuator Driver Board 5 parts quadruped-robot-actuator-driver 1× 1 11 assembly
8.1 Bare PCB pcb-bare 1× 1 · part
8.2 Microcontroller mcu 1× 1 · part
8.3 Power MOSFET mosfet 6× 6 · part
8.4 SMD Passive (R/C/L) smd-passives 1× 1 · part
8.5 Connector connector 2× 2 · part

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Where the joint actuator is used

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

Used in 1 assembly

Leg Module

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 $2–$500. How estimates work
VendorHQSpecialtyMOQLead time
🇨🇳Inovance
inovance.com ↗ 		Shenzhen, CN Drives & motion control 500 units 10–14 wks
🇮🇳Sona Comstar
sonacomstar.com ↗ 		Gurugram, IN EV driveline & motors 500 units 10–14 wks
🇨🇳Broad-Ocean
broad-ocean.com ↗ 		Zhongshan, CN Electric motors 500 units 10–14 wks
🇸🇬Nidec (Singapore)
nidec.com ↗ 		Singapore Motors, regional ops 500 units 10–14 wks
🇮🇳Bosch India
bosch.in ↗ 		Bengaluru, IN Automotive components 500 units 10–14 wks