YFB3 Series Dust-Explosion-Proof Three-Phase Asynchronous Motors

1. Product Overview

The YFB3 Series Dust-Explosion-Proof Three-Phase Asynchronous Motors are totally enclosed, self-fan-cooled, squirrel-cage three-phase asynchronous motors. They feature small size, light weight, reliable operation, and an attractive appearance, along with advantages such as high efficiency, low noise, low vibration, large temperature rise margin, excellent performance, a reasonable explosion-proof structure, and safe and reliable use.

2. Applications

Dust-explosion-proof motors are mainly used in places with combustible dust, including the pharmaceutical industry, textile industry (e.g., cotton fibers, linen fibers, chemical fibers, etc.), metallurgical industry (e.g., magnesium powder, aluminum powder, carbon powder, etc.), grain processing industry (e.g., wheat, corn, grains, etc.), feed processing industry (e.g., blood meal, fish meal), chemical fertilizer industry, tobacco industry, papermaking industry, synthetic materials industry (e.g., plastics, dyes), and building materials industry.

3. Executive Standards

GB/T 755-2019 Rotating Electrical Machines - Ratings and Performance

GB/T 997 Rotating Electrical Machines - Classification of Construction Types, Mounting Arrangements and Terminal Box Positions (IM Codes)

GB/T 1032 Test Methods for Three-Phase Asynchronous Motors

GB 1971 Rotating Electrical Machines - Terminal Markings and Direction of Rotation

GB/T 1993 Cooling Methods for Rotating Electrical Machines

GB/T 3836.1-2021 Explosive Atmospheres - Part 1: General Requirements for Equipment

GB/T 3836.12-2021 Explosive Atmospheres - Part 12: Test Methods for the Characteristics of Combustible Dusts

GB/T 3836.31-2021 Explosive Atmospheres - Part 31: Equipment Protected by Dust-Ignition-Proof Enclosures "t"

GB/T 4942.1 Rotating Electrical Machines - Degrees of Protection Provided by Integral Enclosure Structures (IP Codes) - Classification

GB/T 10068 Mechanical Vibration of Electrical Machines with Shaft Heights of 56 mm and Above - Measurement, Evaluation and Limits of Vibration

GB/T 10069.1 Methods and Limits for Noise Measurement of Rotating Electrical Machines - Part 1: Methods for Noise Measurement of Rotating Electrical Machines

GB/T 10069.3 Methods and Limits for Noise Measurement of Rotating Electrical Machines - Part 3: Noise Limits

GB 18613-2012 Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Motors

GB/T 22714 Test Specification for Interturn Insulation of Formed Windings in AC Low-Voltage Motors

GB/T 22719.1 Interturn Insulation of Random Windings in AC Low-Voltage Motors - Part 1: Test Methods

4. Basic Features

4.1 Frame Size: 80～355

4.2 Rated Power Range: 0.18～375kW

4.3 Number of Poles: 2～16 poles

4.4 Rated Voltage: 380V, 660V, 380/660V, 660/1140V (other voltages can be customized)

4.5 Rated Frequency: 50Hz (60Hz optional)

4.6 Insulation Class: Class F (Class H optional)

4.7 Efficiency: IE3, IE4

4.8 Cooling Method: IC411

4.9 Mounting Type: B3, B5, B35, V1 (optional: B14, B34, V6, etc.)

4.10 Protection Class: IP65

4.11 Duty Type: S1 (S2-S10 optional)

4.12 Ambient Temperature: -20℃～+40℃ (optional: maximum high temperature up to 60℃, minimum low temperature down to -35℃, customizable)

4.13 Altitude: Not exceeding 1000m (other altitudes can be customized)

4.14 Humidity: Maximum monthly average relative humidity not exceeding 90%

4.15 Shaft Extension Key: Type B key

4.16 Bearings: Sealed bearings for frame sizes 132 and below; open bearings for frame sizes 160 and above (optional: sealed bearings for frame sizes 160-280)

4.17 Connection Method: "Y" connection for motors with power ≤3kW and voltage 380V; "△" connection for motors with power >3kW and voltage 380V

4.18 Fan: Anti-static plastic fan (cast aluminum fan optional)

4.19 Rotation Direction (viewed from the shaft extension end): Clockwise (can be adjusted to counterclockwise if needed)

4.20 Corrosion Resistance Class: C3 (optional: C4, C5, CX)

4.21 Topcoat Color: Light blue (RAL5012), customizable

4.22 Main Terminal Box

The main terminal box is located on the top of the motor (viewed from the motor shaft extension end) with a right-side wire outlet, and it can be rotated by 90 degrees. The wire outlet can be adjusted in four directions. However, when the terminal box outlet faces backward (toward the non-shaft extension end), due to the influence of the lifting ring, it is necessary to lift the motor into place at the installation site, remove the lifting ring, open the terminal box cover, loosen the connecting bolts between the terminal box and the frame, and adjust the terminal box outlet to face backward.

The standard wire inlet configuration for the terminal box is a bell-mouth inlet; it can also be made into a threaded pipe wiring inlet or an explosion-proof gland inlet according to user requirements (optional).

4.23 Auxiliary Terminal Box (Optional)

The auxiliary terminal box refers to the terminal box for temperature measurement and heating tape.

4.24 Temperature Measurement and Heating Devices (Optional)

For frame sizes 160～225, a heating tape or PTC temperature measurement device can be installed according to user needs (one of the two options is available). For frame sizes 250-355, a stator bearing temperature measurement device and a heating tape can be installed according to user requirements (optional).

5. Ordering Guide

5.1 Factors to Consider When Selecting a Motor

□ Explosion-Proof Class: Ex tD A21 IP65 T130℃, etc.

□ Voltage: 380V, 660V, etc.

□ Frequency: 50Hz, 60Hz, etc.

□ Mounting Type: IMB3, IMB35, etc.

□ Operating Environment: Indoor, outdoor, ambient temperature, altitude, etc.

□ Protection Class: IP65, etc.

□ Mechanical characteristics and moment of inertia of the driven equipment

□ Connection method between the motor and the driven equipment

□ Starting method, starting frequency, and starting voltage drop, etc.

□ Duty Type: S1 or others

□ Thermal Classification: 155 (Class F) or others

□ Motor Rotation Direction: Clockwise, counterclockwise, bidirectional

□ Terminal Box Position: Top-left, top-right

□ Terminal Box Inlet Type: Bell-mouth, threaded pipe wiring, gland

5.2 Example

Requirements: Frame center height 355, 220kW, 2-pole frame with base, end cover without flange, dust-explosion-proof type of Ex tD A21 IP65 T135℃ (Group T4), 380/660V, clockwise rotation, bell-mouth inlet.

Motor Marking:

Converted to contract terms: YFB3-355M1-220kW 380/660V 50Hz IMB3 Ex tD A21 IP65 T130℃ Bell-Mouth Inlet.

5.3 For special requirements (such as voltage, frequency, protection class, rotation direction, mounting type, double shaft extension, noise, vibration limits, explosion-proof mark, and terminal box inlet type), manufacturing can only be carried out after signing a technical agreement.

5.4 The data in this catalog is subject to change with technological progress without prior notice. Please pay attention to the catalog version.