1221N5M

3.3~6V Precision DC Coreless Motor
Diameter: 12mm; Length: 21mm; Voltage: 3.3~6V; Max. output power: 0.4~1.57W; Speed: 7800~12500rpm; Nominal torque: 0.5~1mNm.

Applications: precision drives in medical equipment and devices, healthcare products, robotics, and industrial automation.
Options: Lead wires length, Shaft length, Special coils, Gearheads, Encoder.

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Parameter Outline Drawing Characteristic Curve Download

Characteristics	Unit	34-78-3.3	65-125-3.7	66-78-6.0
Voltage	V	3.3	3.7	6.0
Terminal resistance	Ω	6.4	2.1	14.5
No-load speed	rpm	7800	12500	7800
No-load current	mA	20	35	25
Stall torque	mNm	1.9	4.8	2.7
Stall current	mA	520	1760	410
Nominal torque	mNm	0.5	1.0	1.0
Nominal speed	rpm	5790	9880	4860
Nominal current	mA	150	400	170
Max.output power	W	0.40	1.57	0.54
Max.efficiency	%	65	74	57
Back-EMF constant	mV/rpm	0.4	0.3	0.7
Torque constant	mNm/A	3.9	2.8	6.9
Speed/torque gradient	rpm/mNm	4000	2600	2900
Rotor inertia	gcm2	0.15	0.15	0.15
Weight	g	10.4	10.4	10.4