Part comparison

maxon HEJ 90 vs Unitree A1 joint motor

A side-by-side comparison of source-backed specifications within the same subcategory.

9 shared specs2 scored

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No imagemaxonmaxon HEJ 90HEJ 90

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Unitree RoboticsUnitree A1 joint motorA1 joint motor

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Directional spec summary

Counts across 2 numeric specifications with a clear higher-or-lower direction.

Part A leads

Tied

Part B leads

These are metric-by-metric differences, not an overall performance score. Check the values below.

Specifications

9 specifications compared side by side.

maxon HEJ 90 / Unitree A1 joint motor
Compare bySpecification	Amaxonmaxon HEJ 90	BUnitree RoboticsUnitree A1 joint motor
Performance2
Peak torque	140 Nm106.5 Nm higher	33.5 Nm
Maximum speed	13 rad/s	21 rad/s8 rad/s higher
Mechanical & integration5
Motor kind	QDD actuator	QDD actuator
Drive principle	BLDC/PMSM	BLDC/PMSM
Architecture	Integrated motor reducer driver	Integrated motor reducer driver
QDD	Yes	Yes
Integrated driver	Yes	Yes
Control & communication2
Communication interfacesUse-dependent	CAN	RS485
Control modes	position;velocity;torque	position;velocity;torque

Amaxonmaxon HEJ 90

BUnitree RoboticsUnitree A1 joint motor

Performance2

Peak torque

Part A140 Nm106.5 Nm higher

Part B33.5 Nm

Maximum speed

Part A13 rad/s

Part B21 rad/s8 rad/s higher

Mechanical & integration5

Motor kind

Part AQDD actuator

Part BQDD actuator

Drive principle

Part ABLDC/PMSM

Part BBLDC/PMSM

Architecture

Part AIntegrated motor reducer driver

Part BIntegrated motor reducer driver

QDD

Part AYes

Part BYes

Integrated driver

Part AYes

Part BYes

Control & communication2

Communication interfacesUse-dependent

Part ACAN

Part BRS485

Control modes

Part Aposition;velocity;torque

Part Bposition;velocity;torque

Product sources

Product sources used by this comparison

maxon HEJ 90Open source ↗

Unitree A1 joint motorOpen source ↗