What Motor Should You Use for Small Pumps, Fans and Compressors? A Complete Guide to YS Series Aluminum Housing Three-Phase Asynchronous Motors

The YS series is a fully enclosed self-ventilated three-phase asynchronous motor, featuring an aluminum alloy die-cast frame and end cover. The frame sizes range from H56 to H132, with a power range typically from 0.06 kW to 7.5 kW, and pole numbers including 2, 4, 6, and 8. It is designed and manufactured according to the JB/T 1009 standard and is a successor to the JW and AO series of small power motors, meeting the IEC 34-1 standard. Main structural features include the aluminum alloy die-cast frame and end cover, which make the motor about 40%-50% lighter than a cast iron motor of the same specification, providing good heat dissipation. The squirrel-cage rotor operates reliably with low maintenance requirements. High-quality ball bearings are used, and the shaft is tempered and chrome-plated for corrosion resistance and durability. The fully enclosed structure uses standard cooling method IC0141, comes with a standard protection grade of IP44, with optional IP54/IP55, and standard insulation grade B with optional F/H grades. The junction box is located on the top or the right side of the motor for convenient wiring. The YS series is generally used in non-explosive environments. For use in coal mine shafts or chemical explosive gas environments, explosion-proof motors such as YBX3 or YB3 should be selected. Why choose the YS series aluminum motor? First, lightweight design offers flexible installation. The aluminum frame is 40%-50% lighter than a cast iron frame, making it especially suitable for scenarios requiring reduced overall equipment weight or limited space, such as small pump units, portable equipment, wall-mounted fans, etc. Second, excellent heat dissipation and low temperature rise. Aluminum alloy has a much higher thermal conductivity than cast iron, aiding motor cooling, reducing winding temperature rise, and extending insulation life. Third, significant cost advantages. Compared with IE3 high-efficiency cast iron motors, the YS series offers better cost-effectiveness in the medium and small power range, suitable for cost-sensitive OEM markets. Fourth, reliable operation with low noise, low vibration, and high starting torque, suitable for continuous duty (S1). Fifth, wide application range, compatible with gear reducers, pumps, fans, air compressors, lathes, drilling machines, refrigeration equipment, medical devices, and other small machinery. The YS series is primarily used in small pump applications, such as small centrifugal pumps, self-priming pumps, pipeline pumps, and submersible pump drives; fan applications, such as axial fans, centrifugal fans, cooling tower fans, and ventilation equipment; compressors, such as small piston air compressors and refrigeration compressors; and machine tools, such as lathes, drilling machines, milling machines, and grinders. Food machinery, such as blenders, meat grinders, and dough mixers; medical devices, such as small pumps, fans, and drive units; construction and agricultural machinery, such as small conveyors, irrigation pumps, and grain processing equipment. Who needs the YS series? OEM support for small water pumps, fans, and compressors; manufacturers of food machinery, packaging machinery, and medical equipment; industrial motor distributors and stockists; equipment maintenance and replacement purchasing teams; export traders targeting markets in the Middle East, Southeast Asia, South America, and other regions requiring small to medium power motors. In what situations should you choose or replace a YS motor? OEM support for small equipment that requires lightweight, compact motors; upgrading or replacing old JW or AO series motors; when equipment space is limited and cast iron motors cannot be installed; cost-sensitive projects where there is no mandatory requirement for IE3 efficiency; exports to markets where IE2/EFF2 efficiency standards are acceptable; occasions requiring frequent start-stop or light-load operation. How to choose a YS motor? First, determine the power based on the shaft load power calculation, leaving a 15%–25% safety margin; then select the pole number: 2 poles about 2800 rpm, 4 poles about 1400 rpm, 6 poles about 900 rpm, 8 poles about 700 rpm; choose the frame size H56–H132 according to the power and pole combination; select the mounting type: B3 foot-mounted horizontal, B5 large flange vertical, B14 small flange vertical, B35 foot + flange, B34 foot + small flange; confirm the voltage and frequency, 380V/50Hz standard, customizable to 220V, 400V, 415V, 440V, 460V, 60Hz; confirm protection and insulation, IP44 standard, IP54/IP55 optional, Class B insulation standard, F/H optional; confirm duty, S1 continuous duty, ambient temperature -15°C to +40°C, altitude ≤ 1000m.

Model example: `YS-90L-4`, meaning YS series, frame size 90, L core length, 4 poles.

Main models and parameter table of YS series (2 poles, 50Hz, 380V, example)

Model	Power kW	Power HP	Speed r/min	Current A	Efficiency %	Power factor	Starting torque / rated	Starting current / rated	Maximum torque / rated
YS-5612	0.09	1/8	2680	0.32	62.0	0.68	2.3	6.0	2.3
YS-5622	0.12	1/6	2660	0.38	67.0	0.71	2.3	6.0	2.3
YS-6312	0.18	1/4	2710	0.53	69.0	0.75	2.3	6.0	2.3
YS-6322	0.25	1/3	2730	0.68	72.0	0.78	2.3	6.0	2.3
YS-7112	0.37	1/2	2760	0.96	73.5	0.80	2.3	6.0	2.3
YS-7122	0.55	3/4	2770	1.35	75.5	0.82	2.3	6.0	2.3
YS-8012	0.75	1.0	2770	1.75	76.5	0.85	2.2	6.0	2.3
YS-8022	1.10	1.5	2800	2.55	77.0	0.85	2.2	7.0	2.3
YS-90S-2	1.50	2.0	2840	3.42	78.5	0.85	2.2	7.0	2.3
YS-90L-2	2.20	3.0	2840	4.80	81.0	0.86	2.2	7.0	2.3
YS-100L-2	3.00	4.0	2890	6.17	84.6	0.87	2.2	7.8	2.3

YS Series Main Models and Parameter Table (4-pole, 50Hz, 380V, Example)

Model	Power kW	Power HP	Speed r/min	Current A	Efficiency %	Power factor	Starting torque / rated	Starting current / rated	Maximum torque / rated
YS-5614	0.06	1/12	1320	0.28	56.0	0.58	2.4	6.0	2.4
YS-5624	0.09	1/8	1320	0.39	58.0	0.61	2.4	6.0	2.4
YS-6314	0.12	1/6	1350	0.48	60.0	0.63	2.4	6.0	2.4
YS-6324	0.18	1/4	1350	0.65	64.0	0.66	2.4	6.0	2.4
YS-7114	0.25	1/3	1350	0.83	67.0	0.68	2.4	6.0	2.4
YS-7124	0.37	1/2	1350	1.12	69.5	0.72	2.4	6.0	2.4
YS-8014	0.55	3/4	1380	1.56	73.5	0.73	2.3	6.0	2.4
YS-8024	0.75	1.0	1390	2.01	75.5	0.75	2.3	6.0	2.4
YS-90S-4	1.10	1.5	1400	2.75	78.0	0.78	2.3	6.5	2.4
YS-90L-4	1.50	2.0	1400	3.65	79.0	0.79	2.3	6.5	2.4

General Technical Parameter Table

Parameter	Specification
Series	YS
Type	Aluminum Shell Three-Phase Asynchronous Motor
Design Standard	JB/T 1009, Compliant with IEC 34-1
Power Range	0.06–7.5kW (Some configurations up to 15kW)
Frame Range	H56–H132
Number of Poles	2P / 4P / 6P / 8P
Rated Voltage	Standard 380V; Customizable to 220V/400V/415V/440V/460V
Rated Frequency	Standard 50Hz; Customizable 60Hz
Protection Level	Standard IP44; Optional IP54/IP55
Insulation Class	Standard Class B; Optional Class F/H
Cooling Method	IC0141 Totally Enclosed Fan-Cooled (TEFC)
Duty	Continuous Duty S1
Connection	Usually Y connection for ≤3kW; Usually Δ connection for ≥4kW
Ambient Temperature	-15°C to +40°C
Altitude	≤1000m
Relative Humidity	≤90%（25°C）
Bearing	High-quality ball bearing
Shaft	Quenched and chrome-plated, rust-resistant
Housing material	Aluminum alloy die-casting

Reference for compatible pump application (example)

Motor power	Number of Poles	Compatible pump type	Reference flow rate	Reference head	Typical applications
0.06–0.25kW	2P/4P	Micro pumps, circulation pumps	0.5–3 m³/h	3–15m	Small water circulation, cooling systems
0.37–0.75kW	2P/4P	Small centrifugal pumps, self-priming pumps	2–10 m³/h	10–30m	Water supply, irrigation, cleaning
1.1–2.2kW	2P/4P	Centrifugal pumps, pipeline pumps	5–25 m³/h	15–50m	Water treatment, boosting, circulation
3.0–7.5kW	2P/4P	Multistage pumps, medium pumps	15–80 m³/h	30–100m	Industrial water supply, process pumps

The above are examples; actual selection must be calculated based on pump curve, medium density, and piping loss.

Dimension drawing placeholder: `[Image: /images/ys-motor-dimension-drawing-b3.webp]`

Key dimension table (B3 mounting, example)

Frame	A mm	B mm	C mm	D shaft diameter mm	E shaft length mm	F key width mm	G mm	H center height mm	K hole diameter mm	Weight kg
63M	100	80	40	φ11	23	4	8.5	63	φ7	2.5
71M	112	90	45	φ14	30	5	11	71	φ7	3.5
80M	125	100	50	φ19	40	6	16	80	φ10	4.5
90S	140	100	56	φ24	50	8	20	90	φ10	5.5
90L	140	125	56	φ24	50	8	20	90	φ10	6.5
100L	160	140	63	φ28	60	8	24	100	φ12	4
112M	190	140	70	φ28	60	8	24	112	φ12	4
132S	216	140	89	φ38	80	10	33	132	φ12	4
132M	216	178	89	φ38	80	10	33	132	φ12	4

Material table

Part	Standard material	Optional material	Description
Housing, end cover	Aluminum alloy die-casting	—	Lightweight, good heat dissipation
Stator winding	Copper wire	100% Copper Wire	Class B standard, F/H class optional
Rotor	Cast Aluminum Cage	—	Reliable, Low Maintenance
Shaft	45# Carbon Steel, Quenched and Tempered + Chrome Plated	Stainless Steel	Anti-Rust Treatment
Bearing	High-quality ball bearing	NSK/SKF	—
Fan Cover	Steel Plate	—	IC0141 Cooling
Junction Box	Aluminum Alloy / Plastic	Top or Right Side	—
Coating	Industrial Paint	Special Anti-Corrosion Paint	—

Installation Method

Installation Code	Description	IM Code	Typical applications
B3	Foot-Mounted, Horizontal, No Flange	IMB3	Horizontal Pump, Fan, Compressor
B5	Large Flange Mounting, No Foot, Vertical	IMB5	Vertical Pump, Pipeline Pump
B14	Small Flange Mounting, No Foot, Vertical	IMB14	Small Pump, Compact Equipment
B34	Foot + Small Flange	IMB34	Horizontal and Vertical Use
B35	Foot + Large Flange	IMB35	Heavy-Duty Horizontal and Vertical Use

Installation Inspection Points: Ensure the foundation is level, foot bolt holes aligned; For B3 installation, use shims to level and tighten foot bolts diagonally; For B5/B14, flange face must be clean and burr-free; Align motor shaft with equipment shaft, suggested radial and angular deviation ≤0.05mm; Test rotation before powering on; Motor lubricant (lithium-based grease) generally replaced every six months, major overhaul usually not required.

Application Scenario Table

Industry	Application	Recommended Configuration	Key Requirements
Water Pump	Small centrifugal pumps, self-priming pumps, pipeline pumps	YS + 2-pole/4-pole, B3/B5	Lightweight, IP44
Fan	Axial fan, centrifugal fan, cooling tower	YS + 4-pole/6-pole, B3/B5	Low noise, good heat dissipation
Compressor	Small piston air compressor	YS + 4-pole, B3	High starting torque
Machine Tool	Lathe, drilling machine, milling machine	YS + 2-pole/4-pole, B3/B5	Low vibration
Food Machinery	Mixer, meat grinder, dough mixer	YS + 4-pole, B3	IP54, easy to clean
Medical Equipment	Small pumps, fans, drive systems	YS + 4-pole, B14	Low noise, compact
Construction & Agriculture	Small conveyors, irrigation pumps	YS + 2-pole/4-pole, B3	Durable, cost-effective
Refrigeration Equipment	Condenser fans, chillers	YS + 4-pole/6-pole, B3	Long-term continuous operation

Note: For explosive environments, please select YBX3/YB3 explosion-proof motors; YS is not suitable.

## Technical FAQ

1. What is the YS series aluminum housing motor?

The YS series is a fully enclosed, self-ventilated, three-phase asynchronous motor with an aluminum alloy die-cast housing, power 0.06–7.5kW, frame size H56–H132, designed and manufactured according to JB/T 1009 standards.

2. What is the power range of the YS series?

Standard 0.06kW–7.5kW, some configurations can reach 15kW.

3. What is the efficiency level of the YS series?

The YS series is generally IE1/IE2 level and can meet EFF2/EFF1 requirements. For IE3 high-efficiency level, please choose the YE3 series.

4. What is the protection level of the YS series?

Standard IP44, optional IP54, IP55.

5. What is the insulation class of the YS series?

Standard Class B insulation, optional Class F and H.

6. What installation methods does the YS series support?

B3、B5、B14、B34、B35。

7. What is the voltage and frequency of the YS series?

Standard 380V/50Hz, customizable to 220V, 400V, 415V, 440V, 460V, 60Hz.

8. Can the YS series be used with a frequency converter?

Yes, but it is recommended to confirm the compatibility with the frequency converter. Standard Class B insulation requires attention to heat dissipation during low-frequency operation.

9. What is the difference between the YS series and the YE3 series?

The YS series is a lightweight aluminum motor with IE1/IE2 efficiency, suitable for medium and low power and cost-sensitive scenarios; YE3 is a cast iron IE3 high-efficiency motor with a larger power range, suitable for continuous heavy load and high energy-saving applications.

10. What is the ambient temperature range for the YS series?

-15°C to +40°C, altitude ≤1000m, humidity ≤90%.

11. What is the cooling method of the YS series?

IC0141 fully enclosed self-ventilation.

12. What type of bearings does the YS series use?

High-quality ball bearings, with shafts tempered and chrome-plated for rust prevention.

13. What duty type does the YS series have?

S1 continuous duty.

14. How to choose a YS motor for a water pump?

Calculate the pump shaft power, reserve 15%–25% margin, select the number of poles according to the speed, and confirm the installation method and voltage.

15. Can the YS series be customized?

Voltage, frequency, installation method, shaft extension, F/H class insulation, IP55, special paint, thermal protector, etc., can be customized.

16. Can the YS series be used in coal mine underground operations?

No. For coal mine underground gas environments, explosion-proof motors like YBX3 must be selected.

Technical FAQ

Is a YS motor suitable for continuous duty?

Many YS variants are used for continuous industrial duty, but the exact duty, insulation class, ambient temperature and enclosure must be checked on the selected model.

What should I match besides kW?

Match speed, shaft dimensions, mounting, voltage, frequency, protection level and terminal-box position. These details often decide whether a replacement fits.

Authoritative references

For standards and energy guidance, see IEC standards and the U.S. Department of Energy motor systems guidance. Use the references as a starting point and confirm the exact edition required for your market.

Long-tail keywords: YS series aluminum motor, small three-phase motor for fan, compact motor for pump, YS motor selection guide