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specs 11evidence [n]sources 1
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field · keyvaluesource sentencesourceEvidenceRetrieved · Changed
Torque constanttorque_constant
valuemeasured at Supply voltage Power Supply Voltage: 230VAC / Power Supply Voltage: AC200 V
as printed 0.720.72 N·m/A
source sentenceTorque constant *1 Nm/A(rms) 0.35 0.41 0.24 0.44 0.54 0.72
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Peak torquepeak_torque
valuemeasured at Supply voltage Power Supply Voltage: 230VAC / Power Supply Voltage: AC200 V
as printed 3333 N·m
source sentenceMax. torque *1 Nm 1.8 3 3 6.6 13 33
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Peak currentpeak_current
valuemeasured at Supply voltage Power Supply Voltage: 230VAC / Power Supply Voltage: AC200 V
as printed 7575 A
source sentenceMax. current *1 A(rms) 6.5 8.9 15.4 19 29 75
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Winding resistancewinding_resistance
valuemeasured at Supply voltage Power Supply Voltage: 230VAC / Power Supply Voltage: AC200 V
0.028
source sentencePhase resistance (at 20℃) Ω 1.43 1.2 0.4 0.33 0.19 0.028
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Winding inductancewinding_inductance
valuemeasured at Supply voltage Power Supply Voltage: 230VAC / Power Supply Voltage: AC200 V
as printed 0.290.29 mH
source sentencePhase inductance mH 2.5 3 1 1.4 1.2 0.29
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Moment of inertiamoment_of_inertia
valuemeasured at With or without brake without brake
125
source sentenceMoment of Inertia (without brake) x10 -4 kg･m 2 .734 1.78 1.78 6.45 15.8 125
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Moment of inertiamoment_of_inertia
valuemeasured at With or without brake with brake
141
source sentenceMoment of Inertia (with brake) x10 -4 kg･m 2 .828 2.16 2.16 6.83 19.8 141
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Weightweight
valuemeasured at With or without brake without brake
17.5
source sentenceMass (without brake) kg 1.4 2.0 2.0 3.4 5.5 17.5
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Weightweight
valuemeasured at With or without brake with brake
19.7
source sentenceMass (with brake) kg 1.5 2.1 2.1 3.8 6.2 19.7
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Encoder typeencoder_type
value
Absolute encoder
source sentenceEncoder type － Absolute encoder Absolute encoder Absolute encoder Absolute encoder Absolute encoder Absolute encoder
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
Max speedmax_speed
valuemeasured at Supply voltage Power Supply Voltage: 230VAC / Power Supply Voltage: AC200 V
as printed 30003000 r/min
source sentenceMax. rotational speed * 1 rpm 6000 5600 4800 4800 4000 3000
sourcehttps://www.harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motors · Maker's document
EvidenceSourced
Retrieved · Changed2026-09-08Changed —
specs 11, 11 shown
Source documents.
1 source the values were read from
1 documents
harmonicdrive.net/products/direct-drive-and-hollow-shaft-motors/direct-drive-and-hollow-shaft-motors/hma-motorsMaker's document · 11 valuesRetrieved 2026-09-08
DownloadSource files are not published yet: which documents may be published is undecided.
No change
2026-09-08first collected · 1 sources
Next update2026-10-01
Change history kept
Build a joint around this part.
Put a motor, a reducer and an encoder into the slots to see whether they combine.
Check joint combinationsJOINT · HMAA21 · B · Motors
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