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HONPINE HONPINE Precision > Robot Joint Motor > Frameless Torque Motor > JMF2 High Torque Density Frameless Torque Motor

JMF2 High Torque Density Frameless Torque Motor

● Introduction

The JMF2 is a frameless torque motor independently developed and manufactured by HONPINE. It consists of several key components, including a rotor core, permanent magnets, stator coating, stator core, winding coils, and power cables.
Manufactured using carefully selected high-performance magnetic materials, the motor incorporates an optimized magnetic circuit design and HONPINE's proprietary welding-free stator assembly process. These technologies enable the JMF2 to deliver high torque density, low heat generation, and minimal cogging torque ripple.

Features

Excellent Performance

Delivers peak torque up to 3 times the rated torque while maintaining good torque linearity under peak operating conditions.

Reliable Operation

Designed to support long-term, stable operation under rated operating conditions.

Low Cogging Torque Ripple

Features excellent cogging torque performance, with ripple as low as 0.3% in selected models, meeting the requirements of precision motion control applications.

Comprehensive Size Range

The product series covers outer diameters from 14 mm to 115 mm, accommodating a wide range of robotic applications.

Customization Capability

Supports customized designs across the entire product series to meet specific application requirements.

Mass Production Capability

Key manufacturing and inspection processes utilize automated equipment to ensure consistent product quality and reliable delivery for large-volume orders.

Specification

Sheet 1

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Model	Unit	JMF2-01405AD	JMF2-01405BD
Rated Voltage (UN)	VDC	12	12
Rated Speed (n)	rpm	1600	4000
Rated Torque (TN)	Nm	0.003	0.004
Rated Power (PN)	W	0.58	1.53
Rated Current	A	0.8	1.05
Peak Torque (Tpeak)	Nm	0.0095	0.0092
Peak Power (Ppeak)	W	1.59	3.83
Peak Current (Ipeak)	A	2.2	2.6
d/q-axis Inductance (Ld/Lq)	μH	53.7/52.5	35.9/35.2
Back-EMF Constant (Ke)	V/1000 rpm	0.3	0.24
Torque Constant (Kt)	mNm/A	4.9	4
Line-to-Line Resistance (R)	Ω	2.64	1.71
Rotor Inertia	10⁻² kg·cm²	0.01	0.01
Number of Poles (2P)	–	14	14
Stator Core Length (A)	mm	5.4	5.4
Rotor Core Length (B)	mm	5	5
Stator Length (C)	mm	9.5	8.8
Weight	g	4	4

Sheet 2

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Model	Unit	JM-1915-A2	JM-1930-A2
Rated Voltage (UN)	VDC	24	24
Rated Speed (nN)	rpm	8000	4000
Rated Torque (TN)	Nm	0.02	0.04
Rated Power (PN)	W	17.9	17.2
Rated Current (IN)	A	1.2	1.5
Peak Torque (Tpeak)	Nm	0.088	0.157
Peak Power (Ppeak)	W	36.5	37.6
Peak Current (Ipeak)	A	4.8	5.6
d/q-axis Inductance (Ld/Lq)	μH	133/133	150/149
Back-EMF Constant (Ke)	V/1000 rpm	1.28	1.92
Torque Constant (Kt)	mNm/A	21.1	31.8
Line-to-Line Resistance (R)	Ω	2.4	2.18
Rotor Inertia	10⁻² kg·cm²	0.14	0.3
Number of Poles (2P)	–	14	14
Stator Core Length (A)	mm	15.6	30.5
Rotor Core Length (B)	mm	15	30
Stator Length (C)	mm	20	35
Weight	g	21	42

Sheet 3

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Model	Unit	JM-2504-A2	JM-2508-A2	JM-2516-A2
Rated Voltage (UN)	VDC	24	24	24
Rated Speed (n)	rpm	22000	12000	6000
Rated Torque (TN)	Nm	0.019	0.042	0.069
Rated Power (PN)	W	45	52	43.6
Rated Current (IN)	A	4.4	3.6	2.8
Peak Torque (Tpeak)	Nm	0.047	0.088	0.195
Peak Power (Ppeak)	W	108	104	70.6
Peak Current (Ipeak)	A	10	7.5	7.5
d/q-axis Inductance (Ld/Lq)	μH	13.9/13.6	41/40.9	80.1/77.8
Back-EMF Constant (Ke)	V/1000 rpm	0.34	0.83	1.77
Torque Constant (Kt)	mNm/A	5.63	13.7	29.2
Line-to-Line Resistance (R)	Ω	0.39	0.86	1.26
Rotor Inertia	10⁻² kg·cm²	0.2	0.4	0.722
Number of Poles (2P)	–	14	14	14
Stator Core Length (A)	mm	4.5	8.5	16.6
Rotor Core Length (B)	mm	4	8	16
Stator Length (C)	mm	9	13	21.6
Weight	g	13	21	38

Sheet 4

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Model	Unit	JM-3806-A2	JM-3806-B2	JM-3812-A2
Rated Voltage (UN)	VDC	24	24	48
Rated Speed (nN)	rpm	12000	5000	10200
Rated Torque (TN)	mNm	90 (S1) / 110 (S2–2 min)	94 (S1) / 110 (S2–2 min)	186 (S1) / 256 (S2–2 min)
Rated Power (PN)	W	112 / 138	49 / 58	199 / 274
Rated Current (IN)	A	7.0 (S1) / 8.5 (S2–2 min)	3.4 (S1) / 4.0 (S2–2 min)	6.2 (S1) / 8.4 (S2–2 min)
Peak Torque (Tpeak)	Nm	0.27 (S2–5 s)	0.27 (S2–5 s)	0.58 (S2–5 s)
Peak Power (Ppeak)	W	282	80	570
Peak Current (Ipeak)	A	21.0 (S2–5 s)	9.8 (S2–5 s)	19.2 (S2–5 s)
Inductance (L)	μH	47	206	114
Back-EMF Constant (Ke)	V/1000 rpm	0.88	1.9	2.1
Torque Constant (Kt)	mNm/A	14.5	30.7	35
Line-to-Line Resistance (R)	Ω	0.27	1	0.484
Rotor Inertia	10⁻² kg·cm²	1.46	0.46	2.8
Number of Poles (2P)	–	20	20	20
Stator Outer Diameter (D)	mm	38	38	38
Stator Length (L1)	mm	11.8	11.8	11.8
Rotor Inner Diameter (d)	mm	20	20	20
Rotor Length (L)	mm	6	6	12
Weight	g	38	38	65

Sheet 5

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Model	Unit	JM-3812-B2	JM-3812-C2
Rated Voltage (UN)	VDC	48	48
Rated Speed (nN)	rpm	6000	2200
Rated Torque (TN)	mNm	189 (S1) / 247 (S2–2 min)	200 (S1) / 270 (S2–2 min)
Rated Power (PN)	W	119 / 155	47 / 61
Rated Current (IN)	A	3.4 (S1) / 4.4 (S2–2 min)	2.3 (S1) / 3.0 (S2–2 min)
Peak Torque (Tpeak)	Nm	0.502 (S2–5 s)	0.59 (S2–5 s)
Peak Power (Ppeak)	W	211	100
Peak Current (Ipeak)	A	9.8 (S2–5 s)	6.8 (S2–5 s)
Inductance (L)	μH	355	869
Back-EMF Constant (Ke)	V/1000 rpm	3.8	5.9
Torque Constant (Kt)	mNm/A	62	97
Line-to-Line Resistance (R)	Ω	1.46	2.97
Rotor Inertia	10⁻² kg·cm²	3.1	3.1
Number of Poles (2P)	–	20	20
Stator Outer Diameter (D)	mm	38	38
Stator Length (L1)	mm	18	18
Rotor Inner Diameter (d)	mm	20	20
Rotor Length (L)	mm	12	12
Weight	g	60	60

Sheet 6

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Model	Unit	JMF3-04304AT	JMF3-04308AS	JMF3-04320AL
Rated Voltage (UN)	VDC	24	36	48
Rated Speed (nN)	rpm	2000	7600	3500
Rated Torque (TN)	Nm	0.08	0.15	0.37
Rated Power (PN)	W	16	120	134
Rated Current (IN)	A	2.8	4	3.8
Peak Torque (Tpeak)	Nm	0.237	0.45	1.11
Peak Power (Ppeak)	W	44	198	216
Peak Current (Ipeak)	A	8.6	12	12
d/q-axis Inductance (Ld/Lq)	μH	85.6/76	81.9/72.9	204/182
Back-EMF Constant (Ke)	V/1000 rpm	1.89	2.6	6.53
Torque Constant (Kt)	mNm/A	31.2	43.2	108
Line-to-Line Resistance (R)	Ω	1.28	0.83	1.65
Rotor Inertia	10⁻² kg·cm²	1.5	5	9
Number of Poles (2P)	–	20	20	20
Stator Core Length (A)	mm	4	8	20
Rotor Core Length (B)	mm	9	13	25
Stator Length (C)	mm	12.5	16.5	28.5
Weight	g	28	57	120

Sheet 7

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Model	Unit	JM-5010-A2	JM-5010-B2	JM-5020-A2	JM-5020-B2
Rated Voltage (UN)	VDC	48	48	48	48
Rated Speed (nN)	rpm	6000	3600	4000	3000
Rated Torque (TN)	Nm	0.32	0.34	0.6	0.67
Rated Power (PN)	W	200	130	250	210
Rated Current (IN)	A	5.5	3.6	7	6
Peak Torque (Tpeak)	Nm	1.02	1.02	2.02	2.14
Peak Power (Ppeak)	W	460	200	560	380
Peak Current (Ipeak)	A	18	11.2	24	20
d/q-axis Inductance (Ld/Lq)	μH	93.7/86.8	244/227	99.1/92.3	161/150
Back-EMF Constant (Ke)	V/1000 rpm	4	6.4	5.9	7.5
Torque Constant (Kt)	mNm/A	66	106	97.8	124
Line-to-Line Resistance (R)	Ω	0.57	1.47	0.55	0.82
Rotor Inertia	10² kg·cm²	6.2	6.2	12	12
Number of Poles (2P)	–	20	20	20	20
Stator Core Length (A)	mm	10.8	10.6	20.8	20.8
Rotor Core Length (B)	mm	10	10	20	20
Stator Length (C)	mm	17.8	18	27.8	27.8
Weight	g	86	86	150	150

Sheet 8

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Model	Unit	JM-6010-A2	JM-6010-B2	JM-6010-C2	JM-6020-A2	JM-6020-B2	JM-6020-C2
Rated Voltage (UN)	VDC	48	48	48	48	48	48
Rated Speed (nN)	rpm	3600	2200	5000	4000	6000	3000
Rated Torque (TN)	Nm	0.49	0.47	0.45	0.94	0.9	0.89
Rated Power (PN)	W	185	109	238	390	570	280
Rated Current (IN)	A	6	3.6	6.8	11.5	16	8.5
Peak Torque (Tpeak)	Nm	1.46	1.44	1.41	2.91	2.94	2.85
Peak Power (Ppeak)	W	302	150	431	780	1320	540
Peak Current (Ipeak)	A	22	13.2	25.5	44	64	33
d/q-axis Inductance (Ld/Lq)	μH	245/248	619/629	164/166	123/124	56.3/57.4	198/201
Back-EMF Constant (Ke)	V/1000 rpm	5.7	9.7	4.64	5.7	3.9	7.22
Torque Constant (Kt)	mNm/A	94	149	76.8	93.9	64	120
Line-to-Line Resistance (R)	Ω	0.69	1.74	0.49	0.29	0.15	0.46
Rotor Inertia	10² kg·cm²	12	12	12	24	24	24
Number of Poles (2P)	–	20	20	20	20	20	20
Stator Core Length (A)	mm	10.6	10.6	10.6	20.6	20.6	20.6
Rotor Core Length (B)	mm	10	10	10	20	20	20
Stator Length (C)	mm	19.8	18.8	18.8	29.5	29.1	29.3
Weight	g	140	140	140	218	218	218

Sheet 9

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Model	Unit	JM-7012-A2	JM-7012-B2	JM-7020-A2	JM-7020-B2
Rated Voltage (UN)	VDC	48	48	48	48
Rated Speed (nN)	rpm	5000	3000	2500	1500
Rated Torque (TN)	Nm	0.8	0.77	1.4	1.4
Rated Power (PN)	W	420	240	370	210
Rated Current (IN)	A	12.5	7.5	12.5	7.5
Peak Torque (Tpeak)	Nm	2.4	2.37	4.2	4.2
Peak Power (Ppeak)	W	800	420	780	360
Peak Current (Ipeak)	A	50	30	50	30
d/q-axis Inductance (Ld/Lq)	μH	92.6/93.8	237/240	161/164	403/410
Back-EMF Constant (Ke)	V/1000 rpm	4.5	7.13	7.8	12.1
Torque Constant (Kt)	mNm/A	73.7	118	128	200
Line-to-Line Resistance (R)	Ω	0.21	0.51	0.29	0.7
Rotor Inertia	10⁻² kg·cm²	22	22	44	44
Number of Poles (2P)	–	20	20	20	20
Stator Core Length (A)	mm	12.8	12.8	20.8	20.8
Rotor Core Length (B)	mm	12	12	20	20
Stator Length (C)	mm	22.8	22.8	30.8	30.8
Weight	g	187	187	292	292

Sheet 10

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Sheet 11

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Sheet 12

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Sheet 13

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