YS Series 4-Pole Small Power Motor (25W – 750W)
Aluminium-frame four-pole squirrel-cage induction motor covering 25 W through 750 W at approximately 1400 rpm on 380 V or 220 V 50 Hz supply. The widest power range in the YS family — from frame 56 through 90L — makes this the default small-power motor choice for pumps, conveyors, mixers, and gearmotor drives where moderate shaft speed and high torque density are required.
Power: 25W – 750W
Frames: 56 – 90L
Voltage: 380V / 220V
Protection: IP44
Frame: Aluminium
The Most Versatile Small Power Motor in the YS Range
The YS 4-pole motor is the most widely used variant in the YS small-power series. Its 1400 rpm shaft speed sits in the ideal range for direct-coupled small pumps and fans, belt-driven conveyors, and gearmotor input shafts where the full 2800 rpm of the 2-pole variant would require a higher reduction ratio and a correspondingly larger gearbox body. The 4-pole motor therefore offers the better overall system efficiency and lowest total drivetrain cost in the majority of light-duty applications.
The power range extends from 25 W (YS5614-4, frame 56) up to 750 W (YS90L-4, frame 90L), giving 10 standardised power steps with close spacing that allows designers to match the motor to the load requirement without significant oversizing. This wide range also means the 4-pole YS motor spans both the fractional-horsepower market (below 370 W) and the lowest end of the sub-integral-horsepower market, making it a single-catalogue solution for light machinery manufacturers.
Korea Ever-Power supplies the YS 4-pole in both 380 V three-phase and 220 V single-phase (capacitor-run) configurations across most of the power range. All units carry IP44 protection as standard, with IP55 available on request. The aluminium alloy housing gives up to 40% weight saving over cast iron and excellent corrosion resistance, with natural oxide finish suitable for food-grade and pharmaceutical environments.
View the complete YS range on the Small Power Aluminum Motors page, or explore paired gearbox options in the Gearmotors section.
YS 4-Pole Model Specifications — 25W to 750W
All models: 4-pole, ~1400 rpm synchronous speed, 50 Hz. Voltage: 380 V Δ / 220 V Y (three-phase) unless noted. IP44 standard.
| Model | Frame | kW | HP | Full-Load A | η % | cosφ | Tst/Tn | Ist/In | kg |
|---|---|---|---|---|---|---|---|---|---|
| YS5614-4 | 56 | 0.025 | 1/30 | 0.22 | 50.0 | 0.65 | 2.2 | 4.0 | 3.8 |
| YS6314-4 | 63 | 0.04 | 1/20 | 0.31 | 52.0 | 0.66 | 2.2 | 4.0 | 5.2 |
| YS6324-4 | 63 | 0.06 | 1/12 | 0.44 | 54.0 | 0.67 | 2.2 | 4.5 | 5.8 |
| YS7114-4 | 71 | 0.09 | 1/8 | 0.62 | 56.0 | 0.68 | 2.2 | 5.0 | 7.8 |
| YS7124-4 | 71 | 0.12 | 1/6 | 0.80 | 58.0 | 0.69 | 2.2 | 5.0 | 8.8 |
| YS8014-4 | 80 | 0.18 | 1/4 | 1.14 | 60.0 | 0.70 | 2.2 | 5.5 | 12.5 |
| YS8024-4 | 80 | 0.25 | 1/3 | 1.52 | 62.0 | 0.71 | 2.2 | 5.5 | 14.0 |
| YS90S-4 | 90S | 0.37 | 1/2 | 2.12 | 65.0 | 0.72 | 2.2 | 6.0 | 17.5 |
| YS90L-4 (550W) | 90L | 0.55 | 3/4 | 3.08 | 68.0 | 0.73 | 2.2 | 6.0 | 20.0 |
| YS90L-4 (750W) | 90L | 0.75 | 1 | 4.02 | 70.0 | 0.74 | 2.2 | 6.0 | 22.0 |
Operating Conditions
| Ambient temperature | −15 °C to +40 °C |
| Altitude | ≤ 1000 m ASL |
| Supply voltage | 380 V / 220 V ± 5% |
| Frequency | 50 Hz ± 1% |
| Mounting | IMB3 / IMB5 / IMB35 |
| Protection | IP44 (IP55 optional) |
| Insulation class | Class F |
| Temperature rise | Class B limit |
| Duty cycle | S1 continuous |
Standards and Certifications
| Motor design | IEC 60034 |
| Frame dimensions | IEC 72-1 |
| Protection rating | IEC 60529 |
| Frame material | Aluminium alloy |
| Quality management | ISO 9001 |
| Marking | CE |
| Poles | 4-pole |
| Synchronous speed | ~1400 rpm at 50 Hz |
Typical Applications for YS 4-Pole Small Power Motors
Light Conveyors and Feeders
Food packaging lines, pharmaceutical blister-pack feeders, and small parts assembly conveyors use the YS 4-pole motor for its moderate shaft speed and high starting torque, allowing direct drive without a reduction stage in many conveyor widths and configurations.
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Small Mixers and Agitators
Laboratory and pilot-scale chemical mixers, paint agitators, and glue-pot stirrers use the 4-pole motor because 1400 rpm input to a small worm gearbox gives the 20 to 100 rpm impeller speed required for most low-shear mixing duties.
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Small Centrifugal Pumps
Garden irrigation pumps, water feature circulation pumps, and chemical dosing pumps use the YS 4-pole motor for direct shaft coupling to the impeller at 1400 rpm, producing moderate head and flow without the noise associated with 2-pole high-speed impeller designs.
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Gearmotor Drives
Paired with NMRV worm gearboxes, the YS 4-pole motor forms the most widely used compact gearmotor configuration in the Korean and Asian light-industry markets, with a ratio range from 5:1 to 100:1 covering output speeds from 14 rpm to 280 rpm.
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Textile Auxiliary Drives
Creel stands, thread tensioners, and fabric-roll turntables on knitting and weaving machines use the YS 4-pole motor for its moderate speed and smooth starting, which prevents thread breakage on delicate yarn materials during start-up.
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Woodworking Accessories
Dust extraction blowers, chip conveyor augers, and finishing sanders on small woodworking benches use YS 4-pole motors for the combination of compact size, moderate speed, and low noise that bench-mounted equipment requires.
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4-Pole vs 2-Pole: Choosing the Right YS Motor for Your Application
Shaft Speed and Torque
At the same power rating and frame size, the 4-pole motor produces twice the shaft torque of the 2-pole motor because torque equals power divided by angular velocity, and the 4-pole runs at half the speed. This higher torque allows direct drive to loads that would require a reduction stage with a 2-pole motor, saving the cost and maintenance of a gearbox in many applications. Choose 4-pole when the load speed is 1000 to 1500 rpm or can be reduced to that range with a modest gear ratio.
Noise and Vibration
The 4-pole motor runs at 1400 rpm compared to 2800 rpm for the 2-pole variant. Aerodynamic noise from the cooling fan varies with approximately the fifth power of speed, so the 4-pole motor is substantially quieter — roughly 12 to 15 dB lower fan noise in practice. For bench-mounted equipment, instrument room installations, and medical device drives where low acoustic emission is specified, the 4-pole motor is the preferred choice over the 2-pole at the same power rating.
Gearbox Compatibility
NMRV worm gearboxes are available in ratios from 5:1 to 100:1 as standard. At 1400 rpm input from a YS 4-pole motor, these ratios give output speeds from 280 rpm down to 14 rpm. At 2800 rpm input from a YS 2-pole motor, the same gearbox ratios give 560 rpm to 28 rpm output. For applications requiring output speeds below 20 rpm, the 4-pole motor with a high-ratio gearbox produces a more compact and efficient assembly than the 2-pole motor, which would require a two-stage reduction to reach the same output speed.
Frequently Asked Questions — YS Series 4-Pole Small Power Motor
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Επιπλέον πληροφορίες
| Editor | Cxm |
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