{"id":132,"date":"2026-07-08T08:23:28","date_gmt":"2026-07-08T08:23:28","guid":{"rendered":"https:\/\/industrialelectricmotor.net\/?post_type=product&p=132"},"modified":"2026-07-08T08:23:28","modified_gmt":"2026-07-08T08:23:28","slug":"ys-series-4-pole-small-power-motor-25w-750w","status":"publish","type":"product","link":"https:\/\/industrialelectricmotor.net\/da\/vare\/ys-series-4-pole-small-power-motor-25w-750w\/","title":{"rendered":"YS Series 4-Pole Small Power Motor (25W \u2013 750W)"},"content":{"rendered":"
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4-Pole 1400 rpm<\/div>\n
Aluminium Housing<\/div>\n
380V \/ 220V 50Hz<\/div>\n
Duty Cycle S1<\/div>\n
IEC 60034 Compliant<\/div>\n
ISO 9001 Certified<\/div>\n<\/div>\n
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\"YS
\n\"YS<\/div>\n
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The Most Versatile Small Power Motor in the YS Range<\/h2>\n

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.<\/p>\n

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.<\/p>\n

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.<\/p>\n

View the complete YS range on the Small Power Aluminum Motors<\/a> page, or explore paired gearbox options in the Gearmotors<\/a> section.<\/p>\n<\/div>\n<\/div>\n

YS 4-Pole Model Specifications \u2014 25W to 750W<\/h2>\n

All models: 4-pole, ~1400 rpm synchronous speed, 50 Hz. Voltage: 380 V \u0394 \/ 220 V Y (three-phase) unless noted. IP44 standard.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Model<\/th>\nFrame<\/th>\nkW<\/th>\nHP<\/th>\nFull-Load A<\/th>\n\u03b7 %<\/th>\ncos\u03c6<\/th>\nTst\/Tn<\/th>\nIst\/In<\/th>\nkg<\/th>\n<\/tr>\n<\/thead>\n
YS5614-4<\/td>\n56<\/td>\n0.025<\/td>\n1\/30<\/td>\n0.22<\/td>\n50.0<\/td>\n0.65<\/td>\n2.2<\/td>\n4.0<\/td>\n3.8<\/td>\n<\/tr>\n
YS6314-4<\/td>\n63<\/td>\n0.04<\/td>\n1\/20<\/td>\n0.31<\/td>\n52.0<\/td>\n0.66<\/td>\n2.2<\/td>\n4.0<\/td>\n5.2<\/td>\n<\/tr>\n
YS6324-4<\/td>\n63<\/td>\n0.06<\/td>\n1\/12<\/td>\n0.44<\/td>\n54.0<\/td>\n0.67<\/td>\n2.2<\/td>\n4.5<\/td>\n5.8<\/td>\n<\/tr>\n
YS7114-4<\/td>\n71<\/td>\n0.09<\/td>\n1\/8<\/td>\n0.62<\/td>\n56.0<\/td>\n0.68<\/td>\n2.2<\/td>\n5.0<\/td>\n7.8<\/td>\n<\/tr>\n
YS7124-4<\/td>\n71<\/td>\n0.12<\/td>\n1\/6<\/td>\n0.80<\/td>\n58.0<\/td>\n0.69<\/td>\n2.2<\/td>\n5.0<\/td>\n8.8<\/td>\n<\/tr>\n
YS8014-4<\/td>\n80<\/td>\n0.18<\/td>\n1\/4<\/td>\n1.14<\/td>\n60.0<\/td>\n0.70<\/td>\n2.2<\/td>\n5.5<\/td>\n12.5<\/td>\n<\/tr>\n
YS8024-4<\/td>\n80<\/td>\n0.25<\/td>\n1\/3<\/td>\n1.52<\/td>\n62.0<\/td>\n0.71<\/td>\n2.2<\/td>\n5.5<\/td>\n14.0<\/td>\n<\/tr>\n
YS90S-4<\/td>\n90S<\/td>\n0.37<\/td>\n1\/2<\/td>\n2.12<\/td>\n65.0<\/td>\n0.72<\/td>\n2.2<\/td>\n6.0<\/td>\n17.5<\/td>\n<\/tr>\n
YS90L-4 (550W)<\/td>\n90L<\/td>\n0.55<\/td>\n3\/4<\/td>\n3.08<\/td>\n68.0<\/td>\n0.73<\/td>\n2.2<\/td>\n6.0<\/td>\n20.0<\/td>\n<\/tr>\n
YS90L-4 (750W)<\/td>\n90L<\/td>\n0.75<\/td>\n1<\/td>\n4.02<\/td>\n70.0<\/td>\n0.74<\/td>\n2.2<\/td>\n6.0<\/td>\n22.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
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Operating Conditions<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
Ambient temperature<\/td>\n\u221215 \u00b0C to +40 \u00b0C<\/td>\n<\/tr>\n
Altitude<\/td>\n\u2264 1000 m ASL<\/td>\n<\/tr>\n
Supply voltage<\/td>\n380 V \/ 220 V \u00b1 5%<\/td>\n<\/tr>\n
Frequency<\/td>\n50 Hz \u00b1 1%<\/td>\n<\/tr>\n
Mounting<\/td>\nIMB3 \/ IMB5 \/ IMB35<\/td>\n<\/tr>\n
Protection<\/td>\nIP44 (IP55 optional)<\/td>\n<\/tr>\n
Insulation class<\/td>\nClass F<\/td>\n<\/tr>\n
Temperature rise<\/td>\nClass B limit<\/td>\n<\/tr>\n
Duty cycle<\/td>\nS1 continuous<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
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Standards and Certifications<\/h3>\n\n\n\n\n\n\n\n\n\n\n
Motor design<\/td>\nIEC 60034<\/td>\n<\/tr>\n
Frame dimensions<\/td>\nIEC 72-1<\/td>\n<\/tr>\n
Protection rating<\/td>\nIEC 60529<\/td>\n<\/tr>\n
Frame material<\/td>\nAluminium alloy<\/td>\n<\/tr>\n
Quality management<\/td>\nISO 9001<\/td>\n<\/tr>\n
Marking<\/td>\nCE<\/td>\n<\/tr>\n
Poles<\/td>\n4-pole<\/td>\n<\/tr>\n
Synchronous speed<\/td>\n~1400 rpm at 50 Hz<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Typical Applications for YS 4-Pole Small Power Motors<\/h2>\n\n\n\n
\"YS<\/p>\n
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Light Conveyors and Feeders<\/div>\n
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.<\/div>\n<\/div>\n<\/td>\n
\"YS<\/p>\n
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Small Mixers and Agitators<\/div>\n
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.<\/div>\n<\/div>\n<\/td>\n
\"YS<\/p>\n
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Small Centrifugal Pumps<\/div>\n
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.<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
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\ud83c\udd95<\/div>\n
Gearmotor Drives<\/div>\n
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.<\/div>\n<\/div>\n<\/td>\n
\n
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\ud83e\uddf9<\/div>\n
Textile Auxiliary Drives<\/div>\n
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.<\/div>\n<\/div>\n<\/td>\n
\n
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\ud83c\udfdb<\/div>\n
Woodworking Accessories<\/div>\n
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.<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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4-Pole vs 2-Pole: Choosing the Right YS Motor for Your Application<\/h2>\n
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Shaft Speed and Torque<\/h3>\n

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.<\/p>\n<\/div>\n

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Noise and Vibration<\/h3>\n

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 \u2014 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.<\/p>\n<\/div>\n

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Gearbox Compatibility<\/h3>\n

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.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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\"Korea<\/p>\n
Rotor Production Line<\/div>\n<\/div>\n
\"Korea<\/p>\n
QC Inspection<\/div>\n<\/div>\n
\"Korea<\/p>\n
Export Packaging<\/div>\n<\/div>\n
\"Korea<\/p>\n
Global Export Shipping<\/div>\n<\/div>\n<\/div>\n<\/div>\n

Frequently Asked Questions \u2014 YS Series 4-Pole Small Power Motor<\/h2>\n
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What is the actual full-load speed of the 4-pole YS motor?<\/div>\n
The synchronous speed of a 4-pole motor at 50 Hz is 1500 rpm. Actual full-load speed is lower due to rotor slip, typically 1350 to 1420 rpm depending on frame size and load. Smaller frames (56 and 63) have higher slip percentages due to higher rotor resistance relative to output power; larger frames (90L) run closer to synchronous speed. The nameplate on each motor states the rated full-load speed for that specific model.<\/div>\n<\/div>\n
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Can the YS 4-pole motor be used with a variable-frequency drive?<\/div>\n
The standard YS 4-pole motor can operate with a variable-frequency drive over a limited speed range (typically 25 Hz to 60 Hz, giving approximately 700 to 1700 rpm) with reduced torque capability at frequencies below 25 Hz due to reduced cooling fan effectiveness. For extended VFD speed range operation or for applications requiring torque control below 25 Hz, Korea Ever-Power recommends the YVF2 inverter-duty motor range, which is specifically wound and insulated for continuous VFD operation. See the VFD Inverter Duty Motors<\/a> page for details.<\/div>\n<\/div>\n
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What shaft diameter is standard for each frame size?<\/div>\n
Standard shaft diameters follow IEC 72-1: frame 56 uses 9 mm diameter, frame 63 uses 11 mm, frame 71 uses 14 mm, frame 80 uses 19 mm, and frame 90 (both S and L) uses 24 mm. All shafts include a standard keyway and are supplied with a key. Shaft extension length also follows IEC standard dimensions. Custom shaft diameters and lengths are available on request for OEM applications.<\/div>\n<\/div>\n
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Is the 750W YS90L-4 a direct replacement for a standard Y2-90L-4?<\/div>\n
Yes. The YS90L-4 and Y2-90L-4 share identical IEC 72-1 frame dimensions: foot-mounting hole spacing, shaft height, shaft diameter, shaft extension length, and flange bolt circle diameter are all the same. The only physical difference is the aluminium housing of the YS versus the cast-iron housing of the Y2, which results in the YS being lighter. Electrical terminals are the same configuration. The YS90L-4 is a direct metric replacement for the Y2-90L-4 without any mechanical modification.<\/div>\n<\/div>\n
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What is the recommended overload protection setting for the smallest models?<\/div>\n
For frame 56 and 63 models drawing less than 0.5 A at full load, standard thermal-magnetic circuit breakers with adjustable trip settings should be set to 1.05 to 1.10 times the nameplate full-load current. Bimetallic overload relays are available down to 0.1 A trip setting and are the preferred protection device for motors operating in continuous duty below 0.5 A full-load current, as circuit breaker trip accuracy degrades at these low current levels.<\/div>\n<\/div>\n
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Are these motors available with a built-in thermal protector?<\/div>\n
Yes, YS series motors for single-phase applications can be supplied with an integral automatic-reset thermal protector embedded in the winding as a factory option. This is particularly valuable for unattended applications such as water pumps and ventilation fans where an overload protection relay in a control panel may not be fitted. The thermal protector automatically resets when the winding cools to a safe temperature and the motor restarts, suitable for cyclic duty on pump and fan loads.<\/div>\n<\/div>\n
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What is the lead time for non-standard configurations?<\/div>\n
Standard catalogue configurations (frame sizes 56 through 90L in 380 V three-phase IP44) are typically available from stock or within 1 to 2 weeks. Non-standard configurations including IP55, single-phase 220 V capacitor-run, special shaft dimensions, and OEM branded units carry a production lead time of 4 to 6 weeks from order. Contact the Korea Ever-Power export team via the enquiry form with your full specification for a detailed lead time and pricing.<\/div>\n<\/div>\n<\/div>\n
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Request a Quote for YS Series 4-Pole Small Power Motors<\/h2>\n

Specify your required power (W), voltage, frame size, protection class, and quantity. Learn about our export capabilities on the About Us<\/a> page.<\/p>\n

Contact Korea Ever-Power<\/a><\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

\n

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 \u2014 from frame 56 through 90L \u2014 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.<\/p>\n

Speed: ~1400 rpm (4P)<\/span>
\nPower: 25W \u2013 750W<\/span>
\nFrames: 56 \u2013 90L<\/span>
\nVoltage: 380V \/ 220V<\/span>
\nProtection: IP44<\/span>
\nFrame: Aluminium<\/span><\/div>\n<\/div>","protected":false},"featured_media":26,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[22],"product_tag":[],"class_list":["post-132","product","type-product","status-publish","has-post-thumbnail","product_cat-small-power-motors","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/industrialelectricmotor.net\/da\/wp-json\/wp\/v2\/product\/132","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/industrialelectricmotor.net\/da\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/industrialelectricmotor.net\/da\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/industrialelectricmotor.net\/da\/wp-json\/wp\/v2\/media?parent=132"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/da\/wp-json\/wp\/v2\/product_brand?post=132"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/da\/wp-json\/wp\/v2\/product_cat?post=132"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/da\/wp-json\/wp\/v2\/product_tag?post=132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}