Overview

This document details the technical specifications and mechanical dimensions of the Y and YX series high-voltage three-phase asynchronous motors, designed for 6kV and 10kV applications with IP23 protection.

1. Motor Types and Ratings

The motors are identified by model codes (e.g., Y3551-2, Y6306-4) that define their design and performance characteristics. Rated output power ranges from 220 kW up to 3550 kW for 6kV motors, with similar ranges for 10kV models. Rated speeds vary according to pole count, including 2980, 1480, 990, 740, 590, and 490 rpm. Each motor type has an associated rated current value.

2. Electrical Performance Parameters

• Power Output: 220 kW to 3550 kW for 6kV motors.
• Speed: Multiple rated speeds corresponding to pole configurations.
• Current: Rated current specified per model.
• Efficiency: High efficiency from approximately 90.6% to 96.8%, improving with motor size and speed.
• Power Factor: Typically between 0.72 and 0.90, increasing with motor power.
• Locked Rotor Current: Approximately 5.5 to 7 times rated current, reflecting typical asynchronous motor inrush.
• Locked Rotor Torque: Generally 0.6 to 0.8 times rated torque.
• Maximum Torque: About 1.8 times rated torque, ensuring strong starting and overload capacity.

3. Mechanical Characteristics

Motor weights vary significantly by size and power, from roughly 1500 kg for smaller units to over 9000 kg for the largest models.

4. Voltage and Protection Class

• Designed for high voltage operation at 6kV and 10kV.
• Protection class IP23: protects against solid objects >12.5 mm and water spray at angles less than 60° from vertical.

5. Key Performance Trends

• Efficiency increases with motor size and speed.
• Power factor improves with higher power ratings.
• Locked rotor current remains consistently high, typical for asynchronous motors.
• Maximum torque consistently about 1.8 times rated torque, supporting reliable start-up and overload conditions.

6. Application and Usage Recommendations

These motors are suitable for industrial environments requiring high power and reliable operation at elevated voltages. The detailed specifications enable precise motor selection based on power, speed, efficiency, and mechanical constraints.

7. Electrical and Performance Specifications Table Summary

The table lists models operating at 490 V with power ratings from 315 kW to 1120 kW. Efficiency ranges from 91.5% to 94.8%, power factor around 0.73–0.74, and speeds from 4720 to 9480 rpm depending on the model.

8. Mounting and Overall Dimensions

8.1 For 6kV IP23 Motors

Detailed mounting dimensions (shaft height, bolt circle diameter, etc.) and overall dimensions (length, height, width) are provided for frame sizes 355 to 630 with 2 poles. Dimensions scale with frame size, e.g., frame 355 has length 1870 mm, height 784 mm, width 1380 mm; frame 630 has length 3220 mm, height 1336 mm, width 2050 mm.

8.2 For 10kV IP23 Motors

Similar dimensional data is provided for 10kV motors with frames 400 to 630 and 2 poles. Dimensions are comparable to 6kV motors but slightly adjusted for voltage rating.

9. Critical Information and Recommendations

• Select frame size and pole number carefully based on application power and speed requirements.
• Verify mounting dimensions to ensure installation compatibility.
• Consider efficiency and power factor for energy consumption optimization.
• Choose appropriate voltage rating (6kV or 10kV) and confirm IP23 protection suitability for the environment.
• Use detailed dimensional tables for precise installation planning.

This structured summary consolidates the essential technical and mechanical data for the Y and YX series high-voltage asynchronous motors, supporting informed engineering decisions for selection and installation.