YS Series 2-Pole Small Power Motor (25W – 370W)

Aluminium-frame two-pole squirrel-cage induction motor covering 25 W through 370 W at approximately 2800 rpm on 380 V or 220 V 50 Hz supply. Compact IEC frame sizes 56 through 90L make this the standard choice for light-duty conveyors, small pumps, blowers, and precision equipment where a compact footprint and low noise are essential.

Speed: ~2800 rpm (2P)
Power: 25W – 370W
Frames: 56 – 90L
Voltage: 380V / 220V
Protection: IP44
Frame: Aluminium

Categoria: Small Power Aluminum Motors

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2-Pole 2800 rpm

Aluminium Housing

380V / 220V 50Hz

Duty Cycle S1

IEC 60034 Compliant

ISO 9001 Certified

YS Series 2-Pole Small Power Motor 25W 370W Korea Ever-Power

YS Motor IEC Mounting Methods IMB3 IMB5 IMB35

Compact High-Speed Fractional-Power Motor for Light Industrial Duty

The YS series is Korea Ever-Power aluminium-frame small-power induction motor, designed as a direct metric replacement for fractional-horsepower motors in light machinery where the full cast-iron Y2 frame series is physically oversized or overweight. The 2-pole variant runs at approximately 2800 rpm synchronous speed at 50 Hz, producing the highest shaft speed in the YS range from the smallest possible motor body.

The aluminium alloy housing and end-shields reduce motor weight by up to 40% compared to an equivalent cast-iron frame, a critical advantage in portable equipment, overhead installations, and machinery where total line weight is constrained. Despite the lighter housing, the core lamination stack and rotor are identical in grade and geometry to the Y2 series, maintaining full compatibility with Y2-footprint equipment during motor replacement.

All YS 2-pole motors carry IP44 protection as standard, with IP55 available on request for washdown or outdoor-mounted applications. Insulation is Class F with Class B temperature-rise limits. Terminal boxes are positioned for top or side cable entry on frame sizes 71 and above. Both 380 V three-phase and 220 V single-phase versions are available across most of the power range.

Compare with the Small Power Aluminum Motors category for the full YS range, or explore heavier-duty options in the Three-Phase Induction Motors section.

YS 2-Pole Model Specifications — 25W to 370W

All models: 2-pole, ~2800 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
YS5612-2	56	0.025	1/30	0.18	52.0	0.72	2.2	4.5	3.5
YS5614-2	56	0.04	1/20	0.26	54.0	0.73	2.2	4.5	3.8
YS6312-2	63	0.06	1/12	0.37	57.0	0.74	2.2	5.0	5.0
YS6314-2	63	0.09	1/8	0.52	59.0	0.75	2.2	5.0	5.5
YS7112-2	71	0.12	1/6	0.67	61.0	0.76	2.2	5.5	7.5
YS7114-2	71	0.18	1/4	0.97	63.0	0.77	2.2	5.5	8.5
YS8012-2	80	0.25	1/3	1.28	65.0	0.78	2.2	6.0	12.0
YS8014-2	80	0.37	1/2	1.82	67.0	0.79	2.2	6.0	13.5
YS90S-2	90S	0.55 (550W)	3/4	2.60	70.0	0.80	2.2	6.0	16.0

Note: YS90S-2 at 550W is included for reference as the top of the YS 2-pole power range; the 370W ceiling applies to the 80-frame models. Exact nameplate ratings may vary by market specification.

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	2-pole
Synchronous speed	~2800 rpm at 50 Hz

Typical Applications for YS 2-Pole Small Power Motors

YS 2-Pole Motor Food Processing Application

Food Processing Equipment

Conveyor belts, portion cutters, and packaging machines in food production lines use the YS 2-pole motor for its compact size, high shaft speed, and low weight, keeping the overall machine weight manageable for line operators.

YS 2-Pole Motor Printing Equipment Application

Printing and Labelling

Label applicators, ink pumps, and roll feeders on printing lines require a high-speed low-power motor that fits within the narrow equipment chassis. The frame 56 and 63 models are particularly suited to these tight-space installations.

HVAC Blowers and Fans

Small centrifugal blowers and inline duct fans for building ventilation use the high speed of the 2-pole winding to deliver high airflow from a compact fan-motor assembly without needing a step-up gearbox or belt drive.

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Laboratory Equipment

Centrifuges, stirrers, and test bench drives in laboratory settings require a motor small enough to fit on the bench whilst delivering the high shaft speed needed for rotor imbalance and material fatigue testing at simulated service conditions.

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Vending and Dispensing

Auger dispensers, cup stackers, and coin mechanisms in vending machines use the smallest YS frame sizes (56 and 63) for their minimal motor envelope, allowing multi-motor layouts within a single machine cabinet.

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Agricultural Irrigation

Small centrifugal pump heads for drip irrigation systems and greenhouse nutrient dosing units use the YS 2-pole motor for its high impeller speed, which allows a smaller pump body to achieve the required flow rate and head pressure.

Why Choose an Aluminium-Frame Motor Over Cast Iron at Small Power Ratings

Weight Reduction

Aluminium has a density approximately one-third that of cast iron. For the same active material content, an aluminium-frame motor weighs 30 to 40% less than an equivalent cast-iron motor, reducing the structural support requirements of the driven machine and lowering shipping costs for export orders. The YS 56-frame motor weighs as little as 3.5 kg, making it hand-portable for installation and maintenance without lifting equipment.

Thermal Conductivity

Aluminium conducts heat approximately four times more effectively than cast iron. At small power ratings where the surface-to-volume ratio is inherently lower than larger motors, aluminium housing transfers motor winding heat to the cooling fins and ambient air more rapidly, keeping winding temperatures lower and extending insulation life at the same rated load. This is why Class F insulation with Class B temperature-rise limits is achievable in the compact YS frame without external forced cooling.

Corrosion Resistance

Aluminium forms a natural oxide layer that resists atmospheric corrosion without painting or surface treatment. In food-processing and pharmaceutical environments where corrosion debris contamination of the product is a concern, the aluminium YS motor is preferred over painted cast iron because surface paint chipping and rust formation are eliminated as potential contaminant sources. The natural aluminium finish also withstands mild acid and alkaline cleaning agents used in CIP procedures.

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Frequently Asked Questions — YS Series 2-Pole Small Power Motor

What is the difference between the YS series and the Y2 series at equivalent power ratings?

The YS series uses an aluminium alloy housing and end-shields in place of cast iron, reducing weight by 30 to 40%. The active electromagnetic components — stator laminations, rotor, and windings — are the same grade as the Y2 series, so electrical performance and mounting dimensions are compatible. The YS is preferred where weight, corrosion resistance, or compact installation is a priority; the Y2 is preferred for continuous heavy-duty or high-vibration installations where cast-iron rigidity is beneficial.

Can the YS 2-pole motor be used on a single-phase 220 V supply?

Yes, for frame sizes 56 through 80 Korea Ever-Power offers a single-phase 220 V capacitor-run version of the YS motor. Single-phase versions include a start capacitor and run capacitor for reliable self-starting and good running efficiency. Output power is approximately 10 to 15% lower than the three-phase equivalent at the same frame size due to inherent single-phase motor losses. Three-phase versions are not self-starting on single-phase supply without a phase converter.

Is IP44 sufficient for outdoor use or food processing environments?

IP44 provides protection against solid objects larger than 1 mm and water splashed from any direction, which is sufficient for sheltered outdoor installations and general food processing environments where occasional water contact may occur. For direct outdoor installation exposed to rain, or for wet-area food processing with frequent hosing, IP55 (dust-tight and water-jet-resistant) should be specified. IP55 variants of the YS series are available on request from Korea Ever-Power.

What gearbox types pair well with the YS 2-pole motor for low-speed output?

The YS series is fully compatible with IEC B14 flange-mounted worm gear reducers (NMRV / RV series) and inline helical gearboxes, which are available from Korea Ever-Power as a gearmotor assembly or as separate components. At 2800 rpm input speed, a worm gearbox with a 50:1 ratio gives approximately 56 rpm output, making the 2-pole YS motor an economical drive for slow-speed conveyors and mixers. Pre-assembled gearmotor combinations with matched IEC flanges are available — see the Gearmotors category for paired options.

How does starting current compare to larger Y2 motors?

YS small-power motors have Ist/In ratios of 4.5 to 6.0, which is slightly lower than the 6.0 to 7.0 typical of larger Y2 motors. Absolute starting current is also very low — the 25 W YS5612-2 draws less than 0.8 A on start. This means standard domestic or light-commercial circuit breakers rated at 6 A or 10 A are sufficient for the smallest models, without requiring motor protection devices or soft starters.

Are spare bearings and shaft seals available for the YS series?

Yes. The YS series uses standard metric deep-groove ball bearings (series 6200 and 6300 depending on frame size) that are universally available from industrial bearing suppliers. Shaft seals, capacitors for single-phase versions, and terminal box covers are available as spare parts from Korea Ever-Power distributors. Standard bearing replacement intervals are 10,000 operating hours for continuous-duty applications at rated load and ambient temperature.

What is the minimum order quantity for the YS series?

Korea Ever-Power maintains stock of the most common YS 2-pole frame sizes and power ratings for single-unit and small-quantity orders. For custom specifications (special voltage, special shaft diameter, special mounting flange, or painted finish), minimum order quantities apply and lead times are typically 4 to 6 weeks. Contact the Korea Ever-Power export team via the enquiry form with your required specification and quantity.

Request a Quote for YS Series 2-Pole Small Power Motors

Specify your required power (W), voltage (380 V three-phase or 220 V single-phase), frame size, and protection class. Learn about our capabilities on the About Us page.

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Editor	Cxm