Micro DC Motor - Brushless DC Motor - NFP-BL-1625WH

Solution Of Permanent Magnet Motors' Cogging Torque Problem

Cogging torque maybe a terrible problem for your application, the best way to solve this problem is to use a coreless design, brushed or brushless types. NFP-BL-1625 motor is just the type of coreless motor.

 

There is no cogging problem in coreless motors, due to them having a uniform 360 degree magnetic stator field and no permanent magnetic circuit elements in the rotor. This means that there is no case where the rotor and stator magnetic circuits are falling in / out of alignment. To learn more about the permanent magnet motors' cogging torque from the following link:

   

Performance	Symbol	1A-15A	5A-12A	6A-30A	7A-12A
Voltage	V	15	12	30	12
Terminal resistance	Ω	42	2.1	8.2	1.4
No-load speed	rpm	9200	23000	30000	30000
No-load current	mA	15	80	60	150
Stall torque	mNm	5.33	28.07	34.37	32.17
Stall current	mA	357	5714	3659	8571
Load torque	mNm	1	1.5	2	3
Load speed	rpm	7473	21771	28254	27202
Load current	mA	67	365	257	862
Max output power	W	1.34	17.14	27.44	25.71
Max efficiency	%	77.7	78.1	76.7	82.6
Back-EMF constant	mV/rpm	1.63	0.52	1	0.4
Torque constant	mNm/A	14.92	4.91	9.39	3.75
Rotor inertia	gcm2	0.6	0.8	0.8	0.8
Wieght	g	21	21	21	21