YVF2 Series VFD Inverter Duty Motor
Variable-frequency inverter duty three-phase squirrel-cage induction motor designed for continuous operation across a wide speed range under pulse-width-modulated supply. Reinforced winding insulation, forced external ventilation, and wide constant-torque speed range from 5 Hz to 50 Hz make the YVF2 the engineered solution for variable-speed industrial drives where a standard Y2 motor would overheat or suffer insulation degradation.
Power: 0.75 – 200 kW
Frames: 90L – 315M
Insulation: Class H
Protection: IP54 / IP55
Forced Ventilation
Purpose-Built for Continuous Variable-Speed Operation Under PWM Supply
The YVF2 is Korea Ever-Power dedicated inverter duty motor, engineered from the outset for operation with pulse-width-modulated variable-frequency drives rather than modified for this duty after the fact. Three design elements distinguish it from a standard Y2 motor operated on a VFD: reinforced inter-turn insulation rated to withstand repetitive voltage spikes up to 1600 V peak, a separately powered external cooling blower that maintains full rated airflow at any shaft speed from 0 rpm upward, and embedded PTC thermistors in each winding phase for direct thermal protection independent of motor speed.
The constant-torque speed range extends from 5 Hz (approximately 150 rpm for a 4-pole motor) to 50 Hz (1450 rpm), with rated torque maintained across the full range without derating. Above 50 Hz, the motor enters constant-power (field-weakening) mode up to a maximum of 100 Hz, suitable for fan and pump loads that require speed above base frequency. This combination of wide low-speed torque capability and high-frequency extension makes the YVF2 suitable for a broader range of variable-speed duties than any single fixed-speed motor model.
Frame sizes range from 90L through 315M, covering 0.75 kW to 200 kW. All units carry Class H insulation (180 °C rated) with Class F temperature-rise limits, CE marking, and IP54 protection as standard (IP55 available on request).
Compare with standard motors on the Three-Phase Induction Motors page, or explore matched Gearmotors for geared variable-speed applications.
YVF2 Series Specifications — 4-Pole Range (Most Common)
Base speed at 50 Hz. Constant torque: 5 – 50 Hz. Constant power: 50 – 100 Hz. Supply: 380 V ± 5% PWM from VFD. Forced external ventilation standard on all models.
| Model | Frame | kW | A (50 Hz) | rpm (50 Hz) | η % | cosφ | Torque Range | kg |
|---|---|---|---|---|---|---|---|---|
| YVF2-90L-4 | 90L | 1.5 | 3.80 | 1420 | 78.0 | 0.81 | 100 – 1500 rpm | 27 |
| YVF2-100L-4 | 100L | 2.2 | 5.20 | 1430 | 80.5 | 0.82 | 100 – 1500 rpm | 36 |
| YVF2-112M-4 | 112M | 4.0 | 8.80 | 1440 | 84.0 | 0.82 | 100 – 1500 rpm | 52 |
| YVF2-132S-4 | 132S | 5.5 | 11.60 | 1440 | 85.5 | 0.83 | 100 – 1500 rpm | 72 |
| YVF2-132M-4 | 132M | 7.5 | 15.40 | 1440 | 87.0 | 0.84 | 100 – 1500 rpm | 88 |
| YVF2-160M-4 | 160M | 11 | 22.00 | 1460 | 88.0 | 0.84 | 100 – 1500 rpm | 120 |
| YVF2-160L-4 | 160L | 15 | 29.80 | 1460 | 89.0 | 0.85 | 100 – 1500 rpm | 148 |
| YVF2-180L-4 | 180L | 22 | 43.00 | 1470 | 90.0 | 0.86 | 100 – 1500 rpm | 198 |
| YVF2-200L-4 | 200L | 30 | 57.50 | 1470 | 91.0 | 0.86 | 100 – 1500 rpm | 258 |
| YVF2-225M-4 | 225M | 45 | 84.00 | 1470 | 92.0 | 0.87 | 100 – 1500 rpm | 358 |
| YVF2-250M-4 | 250M | 55 | 102.00 | 1475 | 92.5 | 0.87 | 100 – 1500 rpm | 450 |
| YVF2-280S-4 | 280S | 75 | 138.00 | 1478 | 93.0 | 0.88 | 100 – 1500 rpm | 580 |
| YVF2-315S-4 | 315S | 110 | 200.00 | 1480 | 93.5 | 0.88 | 100 – 1500 rpm | 820 |
| YVF2-315M-4 | 315M | 200 | 356.00 | 1482 | 94.0 | 0.89 | 100 – 1500 rpm | 1050 |
Operating Conditions
| Ambient temperature | −15 °C to +40 °C |
| Altitude | ≤ 1000 m ASL |
| Supply (via VFD) | 380 V PWM |
| Frequency range | 5 – 100 Hz |
| Constant-torque zone | 5 – 50 Hz |
| Constant-power zone | 50 – 100 Hz |
| Protection | IP54 (IP55 optional) |
| Insulation class | Class H |
| Temperature rise limit | Class F |
| Cooling | IC416 external blower |
Standards and Certifications
| Motor design | IEC 60034-1 |
| Inverter duty | IEC 60034-17 |
| Frame dimensions | IEC 72-1 |
| Protection rating | IEC 60529 |
| Voltage spike rating | ≤ 1600 V peak |
| Thermal protection | PTC per phase |
| Quality management | ISO 9001 |
| Marking | CE |
Typical Applications for YVF2 VFD Inverter Duty Motors
Variable-Speed Pumps
Water supply booster pumps, cooling-water circulation pumps, and process fluid transfer pumps use the YVF2 with a VFD to match pump output to demand, reducing energy consumption and eliminating throttle valve pressure losses.
|
Textile and Converting Lines
Spinning frames, winding machines, and coating lines require continuous speed control from near-zero to full speed with full torque maintained throughout. The YVF2 wide constant-torque range eliminates the multi-motor changeover typical of fixed-speed systems.
|
Mining and Heavy Conveyors
Belt conveyors and apron feeders under load require controlled soft-start and speed ramp capability. The YVF2 with VFD provides smooth starting torque from zero speed, eliminating mechanical starting shock and reducing belt and coupling wear.
|
|
🎬
Film Winding and Unwinding
Tension-controlled film and foil winding machines require torque regulation independent of shaft speed as roll diameter changes. The YVF2 in torque-control mode maintains constant web tension from empty core to full roll without dancer-roll hunting.
|
🌞
HVAC Fan Drives
Air handling unit fans and cooling-tower fans operated with VFDs and YVF2 motors save 30 to 60% of fan energy compared to fixed-speed operation with damper control, with payback periods typically under 18 months at continuous duty.
|
🔧
CNC Machine Spindles
Machining centres and lathes use the YVF2 with a VFD for programmable spindle speed control across a continuous range, replacing mechanical gearboxes and belt-change arrangements in legacy machine tool retrofits.
|
Three Design Features That Make the YVF2 Suitable for VFD Duty
Reinforced Winding Insulation
PWM inverters generate voltage spikes at switching transitions that can reach 1600 V peak in a standard 380 V system, far exceeding the turn-to-turn insulation rating of a conventional motor winding. The YVF2 uses corona-resistant enamel wire (Class H, 180 °C rated) with doubled inter-turn insulation paper and a vacuum-pressure impregnation (VPI) process that eliminates air pockets where partial discharge would otherwise initiate winding degradation. All windings are tested at 2500 V AC for one minute before dispatch.
Independently Powered External Cooling
A standard induction motor relies on its shaft-mounted fan for cooling; at low shaft speed the fan delivers inadequate airflow and the motor overheats under load. The YVF2 uses an IC416 cooling arrangement: a separately powered single-phase blower motor (50 W, 220 V) drives a constant-speed axial fan that maintains full rated airflow at any shaft speed from 0 rpm to maximum. This is the key engineering change that enables full rated torque from near-zero speed without thermal derating.
PTC Thermistor Protection
Three PTC thermistors (one per phase) are embedded in the stator end-windings and wired to an external thermistor relay in the control panel. When winding temperature exceeds the PTC switching threshold (typically 130 °C for Class H insulation), the relay trips the VFD input contactor before thermal damage occurs. This protection is independent of motor speed and supply frequency, providing reliable over-temperature protection across the entire VFD operating range where conventional thermal overload relays lose accuracy due to harmonic heating effects.
Frequently Asked Questions — YVF2 Series VFD Inverter Duty Motor
Request a Quote for YVF2 Series VFD Inverter Duty Motors
Specify your required power (kW), pole count, speed range, and VFD brand. Learn more about our manufacturing on the About Us page.
Επιπλέον πληροφορίες
| Editor | Cxm |
|---|
