YS Series Small Power Motor
YS Series Small Power Motor Overview
The YS series occupies an important position in industrial and commercial machinery as a compact, economical drive solution for applications that do not require the higher power output of standard three-phase induction motors. With physical dimensions substantially smaller than the IEC 63 frame (the smallest size in the standard Y2 series), the YS motor fits into tight mounting envelopes found in machine tool accessories, laboratory equipment, and compact processing machinery.
The entire motor housing, end shields, fan cover, and terminal box are pressure die-cast from aluminum alloy, resulting in a unit weight of only 2.5 to 8.5 kg depending on frame size and power rating. The aluminum construction also provides excellent heat dissipation characteristics and natural corrosion resistance in indoor environments. The exterior surface is finished with a smooth epoxy powder coating in RAL 7035 (Light Grey) or RAL 5010 (Blue) as standard.
Despite their small physical size, YS motors deliver reliable continuous-duty (S1) performance with F-class insulation and sealed bearings designed for a minimum L10 life of 15,000 hours. The motor design supports dual-voltage operation (220V delta / 380V star at 50Hz) from a single terminal connection configuration, simplifying inventory management for OEM manufacturers who ship equipment to markets with different supply voltages.
Technical Specifications
| Parameter | Specification |
|---|---|
| Motor Series | YS (Small Power Three-Phase Asynchronous Motor) |
| Power Range | 40W – 750W (0.054 HP – 1.0 HP) |
| Frame Sizes | YS50, YS56, YS63, YS71, YS80, YS90 |
| Number of Poles | 2-pole (3000 rpm synchronous) and 4-pole (1500 rpm synchronous) at 50Hz |
| Rated Voltage | AC 220V/380V 50Hz (dual voltage); 230V/400V 50Hz and 60Hz options available |
| Insulation Class | Class F (155°C) |
| Protection Class | IP54 (standard), IP55 available on request |
| Cooling Method | IC0141 (totally enclosed, shaft-mounted fan cooled) |
| Duty Rating | S1 (continuous duty) |
| Housing Material | Die-cast aluminum alloy ADC12 |
| Mounting | IM B3 (foot), IM B5 (flange), IM B14 (face), IM B34 (foot + face) |
| Bearing Type | Sealed deep groove ball bearings, L10 life ≥ 15,000 hours |
| Noise Level | ≤ 65 dB(A) at 1 meter (4-pole); ≤ 70 dB(A) (2-pole) |
| Weight Range | 2.5 kg (YS50, 40W) to 8.5 kg (YS90, 750W) |
| Ambient Temperature | -15°C to +40°C |
| Standards | JB/T 009-200, IEC 60034, GB/T 755 |
Selection Table by Frame Size and Power
| Model | Power (W) | HP | Speed (rpm) | Current 380V (A) | Efficiency (%) | Weight (kg) |
|---|---|---|---|---|---|---|
| 2-Pole (3000 rpm synchronous, 50Hz) | ||||||
| YS-50M1-2 | 40 | 0.054 | 2660 | 0.29 | 55 | 2.5 |
| YS-50M2-2 | 60 | 0.08 | 2660 | 0.40 | 60 | 2.8 |
| YS-56M1-2 | 90 | 0.12 | 2680 | 0.55 | 62 | 3.2 |
| YS-56M2-2 | 120 | 0.16 | 2680 | 0.66 | 68 | 3.5 |
| 4-Pole (1500 rpm synchronous, 50Hz) | ||||||
| YS-50M1-4 | 25 | 0.034 | 1330 | 0.29 | 42 | 2.5 |
| YS-50M2-4 | 40 | 0.054 | 1330 | 0.39 | 50 | 2.8 |
| YS-56M1-4 | 60 | 0.08 | 1330 | 0.48 | 56 | 3.2 |
| YS-56M2-4 | 90 | 0.12 | 1330 | 0.67 | 61 | 3.5 |
Additional frame sizes YS63 through YS90 (up to 750W) are available. Contact us for the complete catalog with full dimensional and performance data.
Features and Advantages
Ultra-Compact Dimensions
The YS50 frame motor measures only 115 mm (AC) × 90 mm (AD) × 155 mm (L) and weighs just 2.5 kg. This makes it the smallest three-phase motor in our product range, suitable for mounting in confined spaces inside machine enclosures, control panels, and miniature conveyor systems where standard IEC 63 frame motors are too large. The compact size is particularly valued by OEM equipment builders designing space-constrained machinery.
Lightweight Aluminum Construction
The entire motor assembly — housing, end shields, fan cover, and terminal box — is pressure die-cast from aluminum alloy ADC12. This provides a 40–50% weight reduction compared to an equivalent cast iron motor. Lower weight reduces structural loading on machine frames and simplifies handling during installation and maintenance. The aluminum also provides naturally superior thermal conductivity, helping to dissipate motor heat more effectively.
Dual-Voltage Winding
All YS motors are wound for dual-voltage operation: 220V (delta connection) or 380V (star connection) at 50Hz. A single motor SKU serves both voltage requirements by changing the terminal box connections. This simplifies inventory for OEM manufacturers who export machinery to countries with different supply voltages, and reduces the risk of ordering the wrong voltage variant.
Low Noise and Vibration
Measured noise levels are 65 dB(A) or below at 1 meter for 4-pole models, making the YS series one of the quietest motor options in this power range. Low vibration (typically ≤ 1.8 mm/s unloaded) is achieved through precision rotor balancing and tight bearing tolerances. This quiet operation is important for laboratory equipment, medical devices, office building HVAC auxiliaries, and other noise-sensitive environments.
Industry Applications
Food Processing EquipmentSmall conveyor drives, portion control slicers, labeling machines, date coders, and tabletop mixers. The compact size allows mounting directly on the machine frame. For wet environments, consider upgrading to our stainless steel IP69K motor range. |
Packaging and PrintingLabel applicators, carton sealers, shrink-wrap tunnel conveyors, and small printing press auxiliary drives. The low vibration ensures accurate label placement and print registration on packaging lines running at moderate speeds. |
Textile and Light ManufacturingBobbin winders, thread tensioners, cutting machine feeds, and small press brakes. Also used as auxiliary drives for coolant pumps and chip conveyors on CNC machine tools where the primary drive uses a larger motor. |
Small Fans and Blowers
Exhaust fans, ventilation fans, small centrifugal blowers, and air curtain units for commercial buildings, restaurants, and retail spaces. 4-pole motors (1400 rpm) are most commonly used for direct-drive fan applications.
Small Pumps and Dispensers
Chemical dosing pumps, coolant circulation pumps, fuel dispensers, and hydraulic power packs for compact machinery. 2-pole motors (2660 rpm) provide higher shaft speed for pump impeller applications.
OEM Equipment Integration
YS motors are a popular choice for OEM machine builders who need a reliable, compact motor available in large quantities with consistent quality. Custom shaft lengths, special voltage configurations, and private-label nameplates are available for OEM volume orders.
Gearmotor Combinations
For applications requiring low output speed and increased torque, YS series motors can be directly coupled to our NMRV worm gear reducers (sizes 025 through 063) using a standard IEC B14 face-mount input flange. The resulting gearmotor assembly provides output speeds from 14 rpm to 280 rpm with output torque up to 120 N·m in a compact package. This combination is widely used in conveyor drives, rotary tables, gate operators, and packaging machine indexing mechanisms.
Frequently Asked Questions
What is the smallest three-phase motor available from Korea Ever-Power?
The smallest model in our catalog is the YS-50M1-4, rated at 25W (0.034 HP) with a 4-pole winding at 1330 rpm. The motor frame measures 115 mm wide, 90 mm high to shaft center, and 155 mm in overall length, weighing just 2.5 kg. For 2-pole (high speed) applications, the smallest model is the YS-50M1-2 at 40W (0.054 HP).
Can a YS motor be used on single-phase power?
The YS series is designed for three-phase power supply. For single-phase applications, the motor can be operated from a single-phase supply through a single-phase-to-three-phase VFD converter. Alternatively, we offer dedicated single-phase capacitor-start or capacitor-run motors in similar frame sizes for installations where only single-phase power is available. Contact us for single-phase motor options.
What is the difference between YS and Y2 series motors?
The YS series covers fractional kilowatt ratings below the Y2 series minimum. The Y2 series starts at frame size 63M with a minimum power of 0.06 kW (60W) for 2-pole and 0.12 kW for 4-pole. The YS series extends downward to frame size 50 with power ratings as low as 25W. Both series share the same design principles (aluminum housing, F-class insulation, IP54/IP55), but the YS frame dimensions are outside the standard IEC 60072-1 range.
Can these motors run on a VFD for speed control?
Yes, YS motors can be operated on a VFD for basic speed adjustment. The small power rating means a very small VFD (0.2–0.75 kW) is sufficient. For applications requiring wide speed range or continuous low-speed operation, select a VFD with V/f control mode and set the minimum frequency to 15 Hz or above to maintain adequate cooling from the shaft-mounted fan. Below 15 Hz, consider using an external blower for supplemental cooling.
Are custom shaft configurations available?
Yes. We offer custom shaft modifications including extended shaft length, double-shaft extension (output from both ends), special shaft diameters, D-cut or flat shaft end, and keyway modifications. Custom shaft options are available for orders of 50 units or more with a lead time of 20–30 days. Standard shaft dimensions follow the specifications listed in the motor dimensional drawing supplied with each quotation.
What is the minimum order quantity for YS motors?
For standard YS models in stock configurations, we accept orders from 1 unit for sample evaluation. Volume pricing is available starting from 20 units. For OEM customers with recurring annual requirements, we offer frame agreements with fixed pricing and scheduled deliveries. Custom voltage, special shaft, or private-label nameplate orders require a minimum of 50 units.
How does the YS motor compare to a universal (AC/DC) motor?
Universal motors use carbon brushes and a commutator, which wear out and generate electrical noise. They also have shorter service life (typically 1,000–3,000 hours) and produce more audible noise. The YS three-phase induction motor uses no brushes or commutator, resulting in zero brush maintenance, longer bearing life (15,000+ hours), and significantly lower noise and electromagnetic interference. The trade-off is that a three-phase motor requires a three-phase power supply or a VFD to operate.
What is the lead time for YS small power motors?
Standard YS motors in 4-pole and 2-pole configurations with 220V/380V winding ship within 7–15 business days for common models. Custom specifications or larger frame sizes (YS71, YS80, YS90) may require 15–25 days. Contact our sales team for current stock availability and pricing for your specific requirements.
Customer Experiences
We use YS-56M2-4 motors on 45 label applicator machines that we manufacture for the pharmaceutical industry. Each machine runs the motor at a fixed speed for label dispenser roller drive. Over the past 18 months, we have installed more than 400 of these motors across our production and had exactly one failure — a bearing issue on a unit that had been stored improperly by one of our customers before installation. The consistent quality and competitive pricing make them our standard specification.
Marco S., R&D Director
Packaging Machinery OEM, Bologna, Italy
We replaced 30 worn-out fractional HP motors on our CNC machine coolant pump systems with YS-50M1-2 units. The aluminum housing is about 2 kg lighter than the old cast iron motors, which made the replacement work much easier for our maintenance team. Noise from the coolant pumps dropped noticeably. Delivery of all 30 units took 11 days from order confirmation to our warehouse in Taipei.
Chen Wei, Maintenance Supervisor
CNC Machine Shop, Taichung, Taiwan
We build compact conveyor modules for e-commerce fulfillment centers and needed a motor small enough to fit inside a 120 mm wide conveyor frame. The YS-56M2-4 combined with an NMRV030 worm reducer provides exactly the right speed and torque for our 300 mm wide belt conveyor modules. The motor-gearbox assembly fits perfectly within the frame profile. We have standardized on this combination for all our conveyor products.
Henrik L., Product Designer
Material Handling Equipment Manufacturer, Stockholm, Sweden
Important Technical Note
Performance data listed on this page is based on the YS50 and YS56 frame specifications from our current production catalog. Additional frame sizes (YS63, YS71, YS80, YS90) covering power ratings up to 750W are available — contact us for the complete model list and dimensional drawings. Efficiency values for fractional kilowatt motors are inherently lower than for larger motors due to the higher proportion of friction and windage losses relative to output power. All data conforms to JB/T 009-200, IEC 60034, and GB/T 755 standards.
Need a Small Power Motor Quotation?
Tell us your power requirement, speed, voltage, mounting type, and quantity. We will provide pricing with full dimensional drawings and delivery schedule within 24 hours.
Additional information
| Editor | Cxm |
|---|