Mid-Drive Motor

Assembly

Stator Winding of a BLDC Motor.jpg · Commons ↗ Report photo

Bottom-bracket BLDC motor with a reduction gear set, driving the chainring at up to 80Nm.

Direct parts	7
Total parts	34
Used in	1 assembly
Class	Assembly
Status	unverified

Bottom-bracket BLDC motor with a reduction gear set, driving the chainring at up to 80Nm. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Mid-Drive Motor parts and their functions

7 top-level parts · 34 parts in total · full bill of materials below

Mid-Drive Motor parts diagram: 1 stator assembly, 2 rotor assembly, 3 motor housing, 4 reduction gear set, 5 ball bearing, 6 hall sensor, 7 oil seal. 34 parts in 7 top-level items. — Mid-Drive Motor 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	Stator Assembly 3 parts	1×	Stationary part of an electric motor: a slotted laminated core wound with copper coils that produce the rotating magnetic field.
2	Rotor Assembly 4 parts	1×	Rotating member of an electric motor: a laminated steel core carrying permanent magnets or conductor bars, pressed onto a shaft that delivers the torque.
3	Motor Housing	1×
4	Reduction Gear Set 3 parts	1×	Single-stage helical reduction from the motor rotor to the spindle.
5	Ball Bearing	3×	Deep-groove radial ball bearing.
6	Hall Sensor	3×	Rotor position sensors
7	Oil Seal	2×	Spring-loaded rotary lip seal that keeps lubricant inside a housing and dirt out where a shaft passes through, sized to DIN 3760.

3D model

No 3D model yet. Have a CAD file of this? Add a 3D model. STL renders right on this page; STEP, FreeCAD, and OpenSCAD sources are welcome too (openly licensed, like all 3D models on BOMwiki).

Build & assembly graph

expand / collapse · shared sub-assemblies converge · links to related products · est. labour

product / assembly shared across products atomic part related product

Tap an assembly to expand/collapse · tap a part to open it · use “Open page” for any node · drag to pan, scroll to zoom.

Bill of materials for Mid-Drive Motor

7 top-level lines · 17 rows shown · 34 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	Motor Housing	cargo-bicycle-motor-housing	1×	1	·	part
4	Reduction Gear Set 3 parts	cargo-bicycle-reduction-gear	1×	1	3	assembly
4.1	Motor Pinion Gear	cargo-bicycle-pinion-gear	1×	1	·	part
4.2	Output Gear	cargo-bicycle-output-gear	1×	1	·	part
4.3	One-Way Clutch	cargo-bicycle-one-way-clutch	1×	1	·	part
5	Ball Bearing	ball-bearing	3×	3	·	part
6	Hall Sensor	hall-sensor	3×	3	·	part
7	Oil Seal	oil-seal	2×	2	·	part

Where the mid-drive motor is used

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

Bicycles & Cycling 1 Cargo Bicycle

Used in 1 assembly

Electric Assist 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 $2–$500. How estimates work

Vendor	HQ	Specialty	MOQ	Lead 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