{"id":3085,"date":"2026-03-30T09:01:44","date_gmt":"2026-03-30T09:01:44","guid":{"rendered":"https:\/\/acgearmotor.top\/?post_type=product&p=3085"},"modified":"2026-03-31T00:54:11","modified_gmt":"2026-03-31T00:54:11","slug":"jy-single-phase-ac-gear-motor-capacitor-start-induction-motor","status":"publish","type":"product","link":"https:\/\/acgearmotor.top\/de\/product\/jy-single-phase-ac-gear-motor-capacitor-start-induction-motor\/","title":{"rendered":"JY Single Phase AC Gear Motor | Capacitor Start Induction Motor"},"content":{"rendered":"

Product Overview<\/h2>\n

Not every installation has access to three-phase power. Small workshops, rural agricultural facilities, residential-adjacent commercial buildings, and portable equipment often rely on a standard 220 V single-phase supply. The JY series capacitor-start single phase induction motor<\/b> is purpose-built for exactly this situation: it delivers high starting torque from a single-phase line, making it the natural drive choice for loads that resist initial rotation \u2014 reciprocating compressors, hermetic refrigeration compressors, positive-displacement pumps, and medical apparatus with heavy mechanical seals.<\/p>\n

\"JY<\/p>\n

The product line spans three frame sizes \u2014 09, 1, and 2 \u2014 covering output ratings from 0.18 kW (0.25 HP) through 2.2 kW (3 HP) at 2-pole and 4-pole speed configurations. Buyers can choose between cast iron and die-cast aluminum housings, depending on whether weight savings or ruggedness takes priority. The starting capacitor is mounted in a ventilated housing on top of the motor, which keeps it accessible for inspection and simplifies replacement if the capacitor ever fails. All JY motors feature a totally enclosed, fan-cooled (TEFC) construction with protection ratings of IP44 or IP54. For Korean buyers seeking a cost-effective replacement of single-phase AC gear motor<\/b> drives currently sourced from higher-priced suppliers, the JY series offers equivalent torque performance at a fraction of the landed cost.<\/p>\n

<\/p>\n

Technical Specifications<\/h2>\n

Operating Conditions<\/h3>\n

The JY series is rated for the following service conditions. Motors destined for environments outside these parameters should be discussed with our engineering team for appropriate derating or modifications.<\/p>\n

\n

Ambient temperature:<\/b> \u221215 \u00b0C to +40 \u00b0C<\/p>\n

Altitude:<\/b> \u2264 1 000 m<\/p>\n

Rated voltage:<\/b> 220 V<\/p>\n

Rated frequency:<\/b> 50 Hz \/ 60 Hz<\/p>\n

Duty \/ Rating:<\/b> Continuous (S1)<\/p>\n

Insulation class:<\/b> Class B \/ Class F<\/p>\n

Protection class:<\/b> IP44 \/ IP54<\/p>\n

Cooling method:<\/b> IC0141 (self-ventilated, totally enclosed)<\/p>\n<\/div>\n

Performance Data<\/h3>\n

The table below lists the complete JY model range with output power, rated current, power factor, efficiency, speed, and starting torque ratios. All values are measured at 220 V \/ 50 Hz.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Type<\/td>\nOutput<\/td>\nVoltage<\/td>\nFrequency.<\/td>\nCurrent<\/td>\nPower<\/td>\nEff<\/td>\nSpeed<\/td>\nTstart\/Tn<\/td>\nIst\/In<\/td>\nTmax\/Tn<\/td>\n<\/tr>\n
KW<\/td>\nHP<\/td>\n(V)<\/td>\n(Hz)<\/td>\n(A)<\/td>\nfactor<\/td>\n(%)<\/td>\n(r\/min)<\/td>\n<\/tr>\n
JY09B-2<\/td>\n0.18KW<\/td>\n0.25HP<\/td>\n220<\/td>\n50<\/td>\n2.15<\/td>\n0.76<\/td>\n50<\/td>\n2800<\/td>\n3<\/td>\n6.5<\/td>\n1.8<\/td>\n<\/tr>\n
JY09A-2<\/td>\n0.25KW<\/td>\n0.34HP<\/td>\n220<\/td>\n50<\/td>\n2.82<\/td>\n0.76<\/td>\n53<\/td>\n2800<\/td>\n3<\/td>\n6.5<\/td>\n1.8<\/td>\n<\/tr>\n
JY1B-2<\/td>\n0.37KW<\/td>\n0.5HP<\/td>\n220<\/td>\n50<\/td>\n3.74<\/td>\n0.75<\/td>\n60<\/td>\n2800<\/td>\n3<\/td>\n6.5<\/td>\n1.8<\/td>\n<\/tr>\n
JY1A-2<\/td>\n0.55KW<\/td>\n0.75HP<\/td>\n220<\/td>\n50<\/td>\n5.36<\/td>\n0.74<\/td>\n63<\/td>\n2800<\/td>\n3<\/td>\n7<\/td>\n1.8<\/td>\n<\/tr>\n
JY2B-2<\/td>\n0.75KW<\/td>\n1HP<\/td>\n220<\/td>\n50<\/td>\n6.81<\/td>\n0.77<\/td>\n65<\/td>\n2800<\/td>\n2.8<\/td>\n7<\/td>\n1.8<\/td>\n<\/tr>\n
JY2A-2<\/td>\n1.1KW<\/td>\n1.5HP<\/td>\n220<\/td>\n50<\/td>\n9.45<\/td>\n0.79<\/td>\n67<\/td>\n2800<\/td>\n2.8<\/td>\n7<\/td>\n1.8<\/td>\n<\/tr>\n
JY09B-4<\/td>\n0.12KW<\/td>\n0.16HP<\/td>\n220<\/td>\n50<\/td>\n1.7<\/td>\n0.63<\/td>\n48<\/td>\n1400<\/td>\n2.8<\/td>\n7<\/td>\n1.8<\/td>\n<\/tr>\n
JY09A-4<\/td>\n0.18KW<\/td>\n0.25HP<\/td>\n220<\/td>\n50<\/td>\n2.52<\/td>\n0.65<\/td>\n50<\/td>\n1400<\/td>\n2.8<\/td>\n6.5<\/td>\n1.8<\/td>\n<\/tr>\n
JY1B-4<\/td>\n0.25KW<\/td>\n0.34HP<\/td>\n220<\/td>\n50<\/td>\n3.2<\/td>\n0.67<\/td>\n53<\/td>\n1400<\/td>\n2.8<\/td>\n6.5<\/td>\n1.8<\/td>\n<\/tr>\n
JY1A-4<\/td>\n0.37KW<\/td>\n0.5HP<\/td>\n220<\/td>\n50<\/td>\n4.03<\/td>\n0.72<\/td>\n58<\/td>\n1400<\/td>\n2.8<\/td>\n7<\/td>\n1.8<\/td>\n<\/tr>\n
JY2B-4<\/td>\n0.55KW<\/td>\n0.75HP<\/td>\n220<\/td>\n50<\/td>\n5.12<\/td>\n0.74<\/td>\n66<\/td>\n1400<\/td>\n2.8<\/td>\n7<\/td>\n1.8<\/td>\n<\/tr>\n
JY2A-4<\/td>\n0.75KW<\/td>\n1HP<\/td>\n220<\/td>\n50<\/td>\n6.9<\/td>\n0.76<\/td>\n68<\/td>\n1400<\/td>\n2.8<\/td>\n7<\/td>\n1.8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

JY Series Capacitor Start Single Phase Induction Motor Mounting Arrangements:<\/strong><\/h2>\n

Conventional mounting type and suitable frame size :<\/strong><\/p>\n\n\n\n\n\n\n\n\n
Frame<\/td>\nBasic Type<\/td>\nDerivedType<\/td>\n<\/tr>\n
V3<\/td>\nV5<\/td>\nV6<\/td>\nB6<\/td>\nB7<\/td>\nB8<\/td>\nV15<\/td>\nV36<\/td>\nB14<\/td>\nB34<\/td>\nV18<\/td>\n<\/tr>\n
63~112<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n<\/tr>\n
132~160<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n\u221a<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
180~280<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
315~355<\/td>\n–<\/td>\n\u221a<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Note “\u221a” indicates the structure type that can be manufactured<\/p>\n

JY Series Capacitor Start Single Phase Induction Motor Installation Dimension:<\/strong><\/h2>\n

\"JY<\/p>\n

\n
\n
\n
\n\n\n\n\n\n\n\n
Frame Size<\/td>\n\u00a0Mounting Dimension (mm)<\/td>\n\u00a0Overall Dimension (mm)<\/td>\n<\/tr>\n
\u00a0A<\/td>\nB<\/td>\nC<\/td>\nD<\/td>\nE<\/td>\nF<\/td>\nG<\/td>\nH<\/td>\nK<\/td>\nM<\/td>\nN<\/td>\nP<\/td>\nR<\/td>\nS<\/td>\nT<\/td>\nAB<\/td>\nAC<\/td>\nAD<\/td>\nHD<\/td>\nL<\/td>\n<\/tr>\n
\u00a02<\/td>\n160<\/td>\n112<\/td>\n63<\/td>\n19<\/td>\n40<\/td>\n6<\/td>\n15.5<\/td>\n100<\/td>\n12<\/td>\n115<\/td>\n95<\/td>\n140<\/td>\n0<\/td>\nM8<\/td>\n3<\/td>\n190<\/td>\n190<\/td>\n128<\/td>\n246<\/td>\n330<\/td>\n<\/tr>\n
\u00a01<\/td>\n140<\/td>\n100<\/td>\n56<\/td>\n16<\/td>\n40<\/td>\n5<\/td>\n13<\/td>\n90<\/td>\n10<\/td>\n100<\/td>\n\u00a080<\/td>\n120<\/td>\n0<\/td>\nM8<\/td>\n3<\/td>\n176<\/td>\n176<\/td>\n121<\/td>\n220<\/td>\n286<\/td>\n<\/tr>\n
\u00a009<\/td>\n125<\/td>\n100<\/td>\n50<\/td>\n14<\/td>\n30<\/td>\n4<\/td>\n\u00a011.5<\/td>\n80<\/td>\n10<\/td>\n85<\/td>\n\u00a070<\/td>\n105<\/td>\n0<\/td>\nM8<\/td>\n3<\/td>\n156<\/td>\n156<\/td>\n108<\/td>\n190<\/td>\n258<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

How the Capacitor-Start Motor Works<\/h2>\n

The Single-Phase Starting Problem<\/h3>\n

A single-phase supply produces only a pulsating magnetic field inside the stator \u2014 it alternates back and forth along one axis rather than rotating around the air gap the way a three phase motor<\/b> field does. According to double-revolving-field theory, this pulsating field can be decomposed into two equal but opposite rotating components. At standstill, these two components produce equal and opposite torques, so the net starting torque is zero. The rotor will not begin spinning on its own. Every practical single-phase motor therefore needs an auxiliary mechanism to break this symmetry at startup and produce a net torque in one direction.<\/p>\n

Capacitor-Start Solution<\/h3>\n

The JY motor addresses the starting problem with a dedicated start winding that is physically displaced from the main (run) winding by approximately 90 electrical degrees around the stator bore. A high-capacitance electrolytic capacitor is connected in series with this start winding. The capacitor shifts the current in the start winding ahead of the current in the run winding, creating a phase difference that simulates a two-phase rotating field. This artificial rotating field produces enough torque to accelerate the rotor from rest to roughly 75 % of synchronous speed. At that point, a centrifugal switch mounted on the rotor shaft disconnects the start winding and its capacitor from the circuit, and the motor continues to run on the main winding alone.<\/p>\n

\"JY<\/p>\n

The starting torque ratio (Tstart\/Tn) of the JY series reaches 2.5 to 3.0 times rated torque, which is substantially higher than what a shaded-pole or permanent-split-capacitor motor can deliver. This high breakaway torque is the reason the JY is specified for compressors and refrigeration units that must overcome significant back-pressure when restarting after a brief power interruption.<\/p>\n

<\/p>\n

Typical Application Scenarios<\/h2>\n

Air Compressors<\/h3>\n

Reciprocating piston compressors used in small automotive repair shops, dental clinics, and pneumatic tool stations demand a motor that can push the piston past top-dead-center against full cylinder pressure during startup. The JY series starting torque of 3\u00d7 rated torque handles this requirement. A JY2A-2 rated at 0.75 kW is a common match for portable compressors in the 25 to 50 liter tank range.<\/p>\n

Refrigeration and Cold Storage<\/h3>\n

Walk-in coolers, display-case compressor racks, and ice-making machines often run on single-phase 220 V circuits in small commercial settings. The hermetic or semi-hermetic compressors inside these units need a motor that starts reliably even when refrigerant head pressure is still elevated after a defrost cycle. The JY motor is specified for this exact duty, and its Class B\/F insulation handles the ambient heat near condenser coils without premature degradation.<\/p>\n

Medical and Laboratory Equipment<\/h3>\n

Vacuum pumps in operating rooms, centrifuges in clinical labs, and sterilizer blowers all require consistent starting performance and low vibration. Hospitals and clinics typically have single-phase power outlets at each station, making a three-phase motor impractical without a dedicated converter. The JY fills this gap with a quiet, vibration-controlled package that nurses and technicians can operate without concern about excessive noise in sensitive care areas.<\/p>\n

Small Agricultural Machinery<\/h3>\n

Feed grinders, grain cleaners, and irrigation pumps on small Korean farms often connect to residential-grade single-phase wiring. The 4-pole (1400 r\/min) JY models provide ample torque for belt-driven grain processing at moderate speeds, while the 2-pole (2800 r\/min) variants suit centrifugal water pumps that need higher shaft speed. The cast-iron frame option is preferred for farm environments where the motor may be exposed to dust, grain chaff, and occasional hose-down cleaning. Browse additional types of gear motor<\/a> suited for agricultural duty in our product catalog.<\/p>\n

<\/p>\n

Installation and Maintenance Guide<\/h2>\n

Pre-Installation Checks<\/h3>\n

Before mounting, confirm the supply voltage at the outlet under load \u2014 it should stay within 220 V \u00b1 10 %. A voltage sag beyond this range during motor starting can prevent the rotor from reaching the centrifugal-switch trip speed, leaving the start winding energized and causing it to overheat within seconds. Also verify that the circuit breaker or fuse is rated for the starting current (Ist) listed in the specification table, which can be 6 to 6.5 times the motor rated current.<\/p>\n

Mounting and Alignment<\/h3>\n

Bolt the motor to a rigid, flat base using all four foot-mounting holes. Use a dial indicator or laser alignment tool to bring the motor shaft and driven shaft within 0.05 mm total indicated runout at the coupling faces. Misalignment beyond this limit accelerates bearing wear and can excite torsional vibration in the coupling. For belt-driven arrangements, set belt tension according to the belt manufacturer’s deflection chart and check tension again after the first 48 hours of operation, since new belts stretch slightly.<\/p>\n

Ongoing Maintenance Schedule<\/h3>\n

Keeping the JY motor in reliable service requires only a few periodic tasks:<\/p>\n