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FSG

FSG High Torque Harmonic Drive

The FSG High Torque Harmonic Drive is Laifual Drive’s dedicated High Torque product line, engineered to deliver superior performance for demanding applications.

Building on the proven design of the standard series, the G Series incorporates advanced tooth profile optimization and material enhancements to significantly boost load capacity and durability.

It is the ideal solution for precision motion control requiring higher torque density and longer operational life without increasing the physical size of the gearbox.

Key advantages of the FSG unit include:

Significantly Increased Torque: The FSG features a specialized high-load capacity design. Compared to standard models, the torque output capability is increased by 30%. This allows for the use of smaller gears to drive heavier loads, optimizing space and weight in your machinery.
Extended Service Life: Engineered for endurance, the FSG offers exceptional durability. The service and maintenance time is extended by 43%, ensuring long-term reliability and reduced downtime for industrial automation and robotic systems.
Precision & Efficiency: Maintains the core advantages of Laifual harmonic drives, including zero backlash, high positioning accuracy, and high efficiency transmission.
Versatile Options: Available in a wide range of sizes and reduction ratios to suit various specific requirements.

FSG Rating Parameter Table

Model	Reduction ratio	Rated torque at 2000r/min input		Permissible peak torque at start and stop		Permissible maximum value for average load torque		Permissible maximum momentary torque		Permissible maximum input rotational speed	Permissible average input rotational speed	Backlash	Weight	Design life
		Rated torque at 2000r/min input		Permissible peak torque at start and stop		Permissible maximum value for average load torque		Permissible maximum momentary torque		Grease	Grease	Backlash	Weight	Design life
		Nm	kgfm	Nm	kgfm	Nm	kgfm	Nm	kgfm	r/min	r/min	Arc Sec	kg	Hour
14	50	7	0.7	23	2.3	9	0.9	46	4.7	8500	3500	≤20	FSS-/ IⅡ:0.51	10000
	80	10	1	30	3.1	14	1.4	58⁽¹⁾	5.9⁽¹⁾					15000
	100	10	1	36	3.7	14	1.4	58⁽¹⁾	5.9⁽¹⁾					15000
17	50	21	2.1	44	4.5	34	3.4	91	9	7300	3500	≤20	FSG-I/ I:0.67	10000
	80	29	2.9	56	5.7	35	3.6	109⁽¹⁾	11⁽¹⁾					15000
	100	31	3.2	70	7.2	51	5.2	109⁽¹⁾	11⁽¹⁾					15000
	120	31	3.2	70	7.2	51	5.2	109⁽¹⁾	11⁽¹⁾					15000
20	50	33	3.3	73	7.4	44	4.5	127	13	6500	3500	≤20	FSG-I/ II:0.96	10000
	80	44	4.5	96	9.8	61	6.2	165	17					15000
	100	52	5.3	107	10.9	64	6.5	191	20					15000
	120	52	5.3	113	11.5	64	6.5	191	20					15000
	160	52	5.3	120	12.2	64	6.5	191	20					15000
25	50	51	5.2	127	13	72	7.3	242	25	5600	3500	≤20	FSG-I/ I:1.46	10000
	80	82	8.4	178	18	113	12	332	34					15000
	100	87	8.9	204	21	140	14	369	38					15000
	120	87	8.9	217	22	140	14	395	40					15000
	160	87	8.9	229	23	140	14	408	42					15000
32	50	99	10	281	29	140	14	497	51	4800	3500	≤20	FSG-I/ II:3.11	10000
	80	153	16	395	40	217	22	738	75					15000
	100	178	18	433	44	281	29	841	86					15000
	120	178	18	459	47	281	29	892	91					15000
	160	178	18	484	49	281	29	892	91					15000
40	50	178	18	523	53	255	26	892	91	4000	3000	≤20	FSG-I:4.60	10000
	80	268	27	675	69	369	38	1270	130					15000
	100	345	35	738	75	484	49	1400	143					15000
	120	382	39	802	82	586	60	1510⁽¹⁾	154⁽¹⁾					15000
	160	382	39	841	86	586	60	1510⁽¹⁾	154⁽¹⁾					15000
(1) The instantaneous maximum allowable torque value is limited by the transmission torque of the output terminal connecting screw.

FSS/FFS/FSN/FSG performance parameters

Angle transmission accuracy (Unit: arc min)
Mode	5	8	11	14	17	20	25	32	40
50	3	2	2	1.5	1.5	1	1	1	1
50 and above	3	2	2	1.5	1.5	1	1	1	1

Lag loss (Unit: arc min)
Reduction Ratio	5	8	11	14	17	20	25	32	40
50	3	3	2	2	2	2	2	2	2
50 and above	3	2	2	1	1	1	1	1	1

Stiffness (spring constant)
Project		Model/Unit	5	8	11	14	17	20	25	32	40
T1		Nm	0.075	0.29	0.8	2	3.9	7	14	29	54
T2		Nm	0.22	0.75	2	6.9	12	25	48	108	196
Reduction Ratio 50	K1	×10⁴Nm/rad	0.013	0.044	0.221	0.34	0.81	1.3	2.5	5.4	10
	K2	×10⁴Nm/rad	0.018	0.067	0.3	0.47	1.1	1.8	3.4	7.8	14
	K3	×10⁴Nm/rad	0.025	0.084	0.32	0.57	1.3	2.3	4.4	9.8	18
Reduction Ratio 50 and above	K1	×10⁴Nm/rad	0.02	0.09	0.267	0.47	1	1.6	3.1	6.7	13
	K2	×10⁴Nm/rad	0.027	0.104	0.333	0.61	1.4	2.5	5	11	20
	K3	×10⁴Nm/rad	0.03	0.12	0.432	0.71	1.6	2.9	5.7	12	23

Application

Industrial Robot

Service Robots

Meal Machine Tools

Medical Devices

Analysis,Test Equipment

Energy Related Equipment

Papermaking Equipment

Frequently Asked Questions

What is the primary difference between the FSG High Torque Series and the standard FSS Series?

The main difference lies in the load-bearing capability. Through optimized material selection and advanced tooth profile design, the FSG Series delivers a 30% increase in torque output compared to the standard series of the same size. This allows engineers to achieve higher performance without increasing the gearbox size or weight.

How does the FSG Series contribute to reducing operational costs?

The FSG Series is designed for superior durability. It offers a service and maintenance time extension of 43% compared to standard models. This significant increase in lifespan reduces the frequency of replacements and maintenance shutdowns, ultimately lowering the Total Cost of Ownership (TCO) for your machinery.

Can I replace my existing standard harmonic drive with an FSG Series model?

Generally, the FSG Series is designed to be compact and compatible. If you are looking to upgrade an existing machine to handle heavier payloads, the FSG Series (Models 14–50) can often serve as a high-performance upgrade. However, we always recommend checking the specific dimensional drawings or contacting our engineering team to ensure a perfect fit for your interface.

When should I choose the FSG Series over the standard series?

You should select the FSG Series for applications where space is limited but high power is required. It is ideal for scenarios involving high dynamic loads, frequent acceleration/deceleration, or heavy-duty robotic joints where standard gearboxes might approach their torque limits. It ensures a higher safety margin and longer operational life under stress.

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FSG

Product Overview

FSG High Torque Harmonic Drive

Technical Specifications

FSG Rating Parameter Table

FSS/FFS/FSN/FSG performance parameters

Diagram

Application

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