TYC series high-efficiency low-voltage three-phase permanent magnet synchronous motor

1 Overview

The TYC-80~355 (IP54~IP55) series comprises small, low-voltage, three-phase permanent magnet synchronous motors with asynchronous starting capabilities (utilizing a rotor with squirrel-cage windings). Developed by our company in accordance with the GB/T 22711-2019 standard ("Technical specifications for three-phase permanent magnet synchronous motors—Frame sizes 80–355"), these high-efficiency motors feature innovative design, attractive aesthetics, compact structure, low noise, low vibration, high torque, excellent starting performance, strong overload capacity, high reliability, and ease of use and maintenance. Their efficiency meets or exceeds the Grade 1 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"), making them high-quality, ultra-high-efficiency, energy-saving motors.

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

The enclosure protection class for this series is IP55, in accordance with the GB 4942.1 and IEC 34-5 standards ("Degrees of protection provided by the integral design of rotating electrical machines").

The cooling method for this series is IC411, in accordance with the GB/T 1993 and IEC 34-6 standards ("Methods of cooling for rotating electrical machines"). The structural and mounting configurations for this series of three-phase permanent magnet synchronous motors—specifically IMB3 (horizontal with feet, no flange on end shield), IMB5 (horizontal without feet, with flange on end shield), IMB35 (horizontal with feet, with flange on end shield), and IMV1 (vertical without feet, with flange on end shield)—comply with the GB/T 997 and IEC 34-7 standards regarding "Classification of types of construction and mounting arrangements of rotating electrical machines."

The overall dimensions and mounting dimensions of this series are identical to those of YE2, YE3, and YE4 series three-phase asynchronous motors of the same specifications. Equipped with starting windings and high-performance rare-earth permanent magnets on the rotor, these motors generate starting torque via the windings to initiate rotation; as the speed approaches synchronous speed, the permanent magnets pull the motor into synchronization for normal operation. Consequently, the motors are self-starting and can serve as direct replacements for YE2, YE3, and YE4 series three-phase asynchronous motors of equivalent specifications. This series utilizes Class F insulation, while the temperature rise for the entire range is rated according to Class B standards, thereby significantly enhancing safety and reliability.

2 Scope of Application

This series of motors is suitable for driving various general-purpose machinery—such as compressors, fans, water pumps, machine tools, and transport equipment—and serves as a prime mover in industrial and mining enterprises across sectors including mining, machinery manufacturing, petrochemicals, and power generation. For applications involving high-inertia loads—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 specialized design to ensure reliable operation. Basic conditions for normal motor operation:

a. Altitude not exceeding 1000 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 that the monthly average minimum temperature for that month does not exceed 25°C;

d. Power supply frequency of 50 Hz ± 1%;

e. Operating voltage variation within ± 5% of the rated voltage;

f. Motor duty type: continuous duty (S1).

3 Model Designation

The motor model designation is composed of two parts arranged sequentially—the product code and the specification code—in accordance with GB4831. The product code consists of the motor series code, with the following meanings:

TYC — Three-phase permanent magnet synchronous motor with asynchronous starting capability (via a rotor-mounted squirrel-cage starting winding); IE4 efficiency class; National Standard Energy Efficiency Grade 1.

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

Example:

4 Structural Description

The motor frame and end shields are made of 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, utilizing Class F insulation materials; a special lashing process ensures the winding end turns are securely fixed. The entire stator undergoes Vacuum Pressure Impregnation (VPI) with Class F solvent-free varnish, resulting in excellent, reliable insulation performance as well as superior moisture and impact resistance.

The rotor features a squirrel-cage starting winding (constructed via die-cast aluminum or welded copper bars) and an internal permanent magnet configuration with reliable magnetic isolation measures, ensuring dependable operation. Rolling bearings are used, with a standard enclosure protection rating of IP55; if the motor requires a higher protection rating, the bearing protection rating is upgraded accordingly.

Motors in the H180–355 frame sizes are equipped with systems for adding and draining grease without stopping the motor, allowing for maintenance using specialized tools during operation.

The main terminal box features a sealed design with a protection 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 user requirements. A dedicated grounding terminal is provided inside the terminal box.

5 Starting of Squirrel-Cage Asynchronous-Start Three-Phase Permanent Magnet Synchronous Motors (TYC Series)

Advanced computational techniques are employed to analyze the starting temperature rise and stress within the rotors of these motors, preventing premature failure caused by excessive starting loads. Users are advised to verify the following: (1) the moment of inertia of the driven equipment's rotating parts (referred to the motor speed) must not exceed the value specified in the "Load J" entry of the technical data sheet; (2) the power supply system must ensure that the voltage at the motor terminals remains at or above 85% of the rated voltage during the starting process; and (3) the load torque characteristics of the driven machinery correspond to those of water pumps or fans. Under the conditions specified above, the motor is permitted to undergo two consecutive starts from a cold state (allowing for the motor to coast to a stop between starts) or one start from a hot state. Any subsequent start exceeding these limits must only be attempted after the motor has been stopped for one hour.

If the moment of inertia of the driven mechanical components exceeds the "Load J" value specified in the technical data sheet, or if the application requires frequent starting or starting under heavy load, please contact our company beforehand to discuss a special design that ensures reliable motor starting.

6 Ordering Information

Please specify the following details when placing an order:

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

(2) Rated power: (160 kW)

(3) Rated voltage: (380 V)

(4) Rated frequency: (50 Hz)

(5) Number of poles: (6 poles)

(6) Synchronous speed: (1000 r/min)

(7) Degree of protection: (IP55)

(8) Cooling method: (IC411)

(9) Mounting arrangement: (IMB3)

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

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

(12) Altitude: (≤100 m)

(13) Ambient air temperature: (-15°C to 40°C)

7 Precautions

1. Verify the moment of inertia of the driven machinery (referred to the motor speed); please refer to Chapter 5 above regarding the starting of squirrel-cage asynchronous-start three-phase permanent magnet synchronous motors. When starting motors of this series, pay special attention to the starting time and temperature. Prevent excessive starting times or excessively high temperatures, which could cause the permanent magnets to fail and damage the motor.

2. If operating conditions change or other special requirements arise, a separate technical agreement must be signed prior to the execution of the purchase contract.

3. The technical performance data listed in the tables within this brochure are guaranteed values ​​intended for reference during design selection and ordering.

4. Technical data and dimensions are subject to change without prior notice due to technological advancements or revisions to relevant domestic and international standards; please request the official outline drawing from our company after placing an order.

5. If the technical performance data listed in the brochure tables do not meet your requirements, please consult our technical department and request the relevant information.