I. Overview of the YVFE3 Series Ultra-High-Efficiency Inverter-Fed Adjustable-Speed Motors:

The YVFE2/E3 series inverter-fed three-phase induction motors were developed to meet market demands, incorporating advanced foreign technologies and building upon the manufacturer’s extensive experience producing the YJT series inverter-fed adjustable-speed motors.

In electromagnetic design, the stator and rotor slot configurations, winding types, and connection methods have been optimized to ensure compatibility with inverter power supplies. This optimization enables the motor to maintain overload capacity at high frequencies while delivering constant torque output at low frequencies. Structurally, the mounting dimensions conform to those of the Y-series motors; except for a reduced overall length, all other external dimensions match the Y-series, ensuring strong interchangeability and ease of integration for end users. These motors employ an independent axial-flow blower for forced ventilation, guaranteeing effective cooling across the entire frequency range and keeping temperature rise within specified limits.

When paired with inverters, the YVFE2/E3 series inverter-fed three-phase induction motors form highly efficient speed-control systems. Compared with other speed-control methods, this system delivers significant energy savings, excellent speed regulation performance, and a wide speed-adjustment range. It features low noise, minimal vibration, and full compatibility with both domestic and international inverters. It is widely applicable in industries such as light industry, textiles, chemicals, metallurgy, and machine tools—particularly for constant-torque or constant-power speed control applications—as well as for energy-saving speed control of fans and pumps, facilitating automated control of speed-regulation systems.

The 4-pole motors of the YVFE2/E3 series comply with JB/T 7118–93 “Technical Specifications for Small Variable-Voltage/Variable-Frequency Adjustable-Speed Motors and Their Power Supplies”; motors with other pole numbers comply with IEC 34-1 and GB/T 755.

II. Model Designation of the YVFE3 Series Ultra-High-Efficiency Inverter-Fed Adjustable-Speed Motors

Taking YVFE2/E3-200L1-6 as an example: YVFE2/E3 denotes the motor model; 200 indicates the center height (mm); L is the frame length code; 1 is the core length code; and 6 indicates the number of poles.

III. Operating Conditions for the YVFE3 Series Ultra-High-Efficiency Inverter-Fed Adjustable-Speed Motors

1. Altitude: not exceeding 1,000 m.

2. Ambient air temperature: varies seasonally but does not exceed +40 °C, nor fall below –15 °C.

3. Maximum monthly average relative humidity: 90%, provided that the corresponding monthly average minimum temperature does not exceed 25 °C.

IV. Construction Features of the YVFE3 Series Ultra-High-Efficiency Inverter-Fed Adjustable-Speed Motors

1. Enclosure protection rating: IP55.

2. Cooling method: totally enclosed with independent axial-flow blower (IC416).

3. Optional high-resolution sensors available upon request, including optical encoders, resolvers, and tachogenerators.

4. Optional accessories available upon request, including electromagnetic brakes (energized or de-energized braking) and gearmotors.

5. The terminal box is located on the right side of the frame when viewed from the drive-end shaft extension; left-side or top-mounted configurations are available upon request.

V. Key Technical Performance and Specifications of the YVFE3 Series Ultra-High-Efficiency Inverter-Fed Adjustable-Speed Motors

1. Duty type: continuous (S1).

2. Rated voltage: 380 V; rated frequency: 50 Hz. Voltage and frequency ratings may be customized per customer requirements.

3. Insulation class: F.

4. Constant-torque speed control range: 5–50 Hz for center heights H80–H255; 3–50 Hz for center heights H250–H355. Constant-power speed control range: 50–100 Hz. High-frequency range may be customized per customer requirements.

5. High overload capacity.

6. Excellent low-speed performance.

7. Winding connection: star (Y) for frame sizes up to 280; delta (Δ) for frame sizes 315 and 355.

VI. Mounting Configurations of the YVFE3 Series Ultra-High-Efficiency Inverter-Fed Adjustable-Speed Motors

VII. Ordering Information for the YVFE3 Series Ultra-High-Efficiency Inverter-Fed Adjustable-Speed Motors

1. When placing orders, please specify the motor model, rated power, rated voltage, rated frequency, high-frequency range (especially critical for 2-pole motors), and mounting configuration.

2. For special requirements regarding voltage class, speed-control characteristics, insulation class, protection class, or mounting dimensions, please indicate them clearly at the time of ordering for separate discussion and agreement.