YE3 Series High-Efficiency Low-Voltage Three-Phase Asynchronous Motor

1 Overview

The YE3-80~355 (IP54~IP55) series of small-sized, low-voltage, three-phase asynchronous motors are high-efficiency motors designed and developed by our company. They feature novel designs, attractive aesthetics, low noise, high torque, excellent starting performance, compact structures, and ease of use and maintenance. Their efficiency fully meets the Grade 2 energy efficiency requirements specified in GB 18613-2012, "Minimum Allowable Values ​​of Energy Efficiency and Energy Efficiency Grades for Small and Medium-sized Three-phase Asynchronous Motors." They have also passed the energy-saving product certification by the China Quality Certification Center (CQC) and obtained the corresponding certificate.

The power ratings, electrical performance, mounting dimensions, and tolerances of this motor series comply with the national standard GB 755 ("Rotating Electrical Machines – Rating and Performance"), the International Electrotechnical Commission (IEC) standard IEC 34-1 ("Rotating Electrical Machines – Rating and Performance"), and the machinery industry standard GB/T 4772.1, among others.

The enclosure protection ratings for this series are IP54 and IP55, in accordance with GB 4942.1 and IEC 34-5 ("Degrees of Protection Provided by the Enclosure of Rotating Electrical Machines").

The cooling method for this series is IC411, in accordance with GB/T 1993 and IEC 34-6 ("Methods of Cooling for Rotating Electrical Machines").

The structural and mounting arrangements for this series include IMB3 (horizontal with feet, no flange on end shield), IMB5 (horizontal frame without feet, with flange on end shield), IMB35 (horizontal frame with feet, with flange on end shield), and IMV1 (vertical frame without feet, with flange on end shield), complying with the provisions of GB 997 and IEC 34-7 ("Classification of Types of Construction and Mounting Arrangements of Rotating Electrical Machines").

This series utilizes Class F insulation, with the entire range assessed based on Class B temperature rise limits, thereby significantly enhancing safety and reliability.

2 Scope of Application

This series of electric motors is suitable for driving various general-purpose machinery—such as compressors, fans, water pumps, machine tools, and transport equipment—serving as prime movers in industrial and mining enterprises across sectors like mining, machinery manufacturing, petrochemicals, and power generation. For motors driving machinery with high inertia—such as blowers, coal mills, rolling mills, hoists, crushers, and belt conveyors—relevant technical data must be provided and a technical agreement signed at the time of ordering; this information serves as the basis for the motor's special design to ensure reliable operation.

Basic conditions for normal motor operation:

a Altitude not exceeding 1,000 m;

b Maximum ambient air temperature not exceeding 40°C; minimum ambient air temperature of -15°C;

c Monthly average maximum relative humidity of 90% during the most humid month, provided the monthly average minimum temperature does not exceed 25°C;

d Power supply frequency of 50 Hz ± 1%;

e Operating voltage fluctuation range within ± 5% of the rated voltage;

f Motor duty type: Continuous duty (S1);

3 Model Designation

In accordance with the GB4831 standard, the motor model designation consists of two parts arranged in sequence: the product code and the specification code. The product code indicates the motor series, with the following meaning:

YE3 — High-efficiency three-phase asynchronous motor with squirrel-cage rotor

The product specification code consists of the shaft height, the core length sequence number, and the number of poles.

Example:

4 Structural Description

The motor frame and end shields are constructed from high-strength cast iron, and the stator utilizes an external press-fit structure. The stator windings consist of randomly wound soft coils made of round copper wire. Class F insulation materials are employed; the winding end turns are secured using a specialized, robust, and reliable lashing process. The entire stator undergoes Vacuum Pressure Impregnation (VPI) with Class F solvent-free varnish, ensuring excellent, reliable insulation performance as well as superior moisture and impact resistance.

Motors in this series feature a cast-aluminum squirrel-cage rotor for reliable operation. Rolling bearings are used, with a standard enclosure rating of IP54; if a higher motor enclosure rating is specified, the bearing protection rating is upgraded accordingly.

Motors in the 315–355 frame sizes are equipped with on-the-fly greasing and drainage systems, allowing for lubrication and grease replacement without stopping the motor.

The main terminal box features a sealed design with an enclosure rating matching that of the motor. It is typically mounted on top of the motor frame but can be positioned on the side to meet specific customer requirements. A dedicated grounding terminal is provided inside the terminal box.

5 Starting of squirrel cage asynchronous motor (YE3 series)

The rotor of the squirrel cage asynchronous motor uses advanced computing technology to calculate the starting temperature rise and stress of the squirrel cage rotor to prevent early damage to the motor due to excessive starting load. It is recommended that the user check: (1) The moment of inertia of the rotating part of the driven mechanical equipment (after conversion to the motor speed) should not exceed the value of the [Load J] item in the technical data table; (2) The user's power grid should ensure that the motor terminal voltage during the starting process is not less than 85% of the rated voltage; (3) The resistance torque characteristics of the driven machinery are those of water pumps and fans.

Under the above conditions, the motor is allowed to be started twice continuously in the actual cold state, and the motor is naturally stopped between two starts; or it is allowed to be started once in the hot state. If the motor exceeds the above limit, the motor should be restarted after parking for 1 hour.

If the moment of inertia of the mechanical rotating part driven by the motor exceeds the [Load J] value in the technical data sheet, or the motor is required to be started frequently, or the motor may be started with a heavy load, be sure to contact our company in advance for special design to ensure reliable starting of the motor.

6 Ordering Information

Please specify the following details when placing an order:

(1) Motor model: (YE3-355M1-6)

(2) Rated frequency: (50Hz)

(3) Rated power: (160kW)

(4) Rated voltage: (380V)

(5) Number of poles: (6 poles)

(6) Protection class: (IP54)

(7) Cooling method: (IC411)

(8) Mounting type: (IMB3)

(9) Direction of rotation: (Clockwise [viewed from the shaft extension end])

(10) Terminal box position: (Top of the motor)

7 Precautions

1. Verify the moment of inertia of the driven machinery (referred to the motor speed); please refer to Chapter 5: Starting of Squirrel-Cage Motors.

2. If operating conditions change or there are other special requirements, a separate technical agreement must be signed before the purchase contract is finalized.

3. The technical performance data listed in the catalog tables are guaranteed values ​​intended for reference during design selection and ordering. 4. Technical data and dimensions in the catalog are subject to change without prior notice due to technological advancements and revisions to relevant domestic and international standards; please request the official outline drawing from our company after placing an order.