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Three Phase Permanent Magnet Ac Motor For Screw Air Compressor

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Three Phase Permanent Magnet Ac Motor For Screw Air Compressor

Country/Region	china
City & Province	qingdao shandong
Categories	Air-Compressors

Product Details

Three-Phase Permanent Magnet AC Motor For Screw Air Compressor

Product Parameters:

Frame size: H112 to H450

Rated speed:1500rpm,3000rpm, or according to customer requirements

Protection grade: lP55 IP56 IP65

Insulation class: F, H

Thermal protection device: PTC, PT100

Bearing Brand: FAG, SKF

Power supply voltage:220v,380v,415v,660v,6kv,10 kv or according to customer requirement

Installation: B3,B5,B35 V1,etc

Service factor:1.15,1.2,1.25,1.3 or according to customer requirements

Cooling method: IC411, IC416

Application altitude: 1000m or according to customer requirements

Control mode: inverter open loop vector control

Product Description:

This series of motors is specially designed to consider the special working conditions of the compressor, with high efficiency, low noise, strong overload capacity, long bearing life, and so on. The performance and installation size of this series of motors conforms to the lEC60034 standard, DIN42673 standard, GB755 standard, and related professional and technical standards. And the company has passed IS09001 international quality system certification many times.

From the order, development, manufacturing, inspection, sales, and service process in accordance with the requirements of IS09001 quality system control. This series of motors consider that the cable of the motor is directly connected to the electric control box of the compressor. According to the user's requirements, the motor can be equipped with extended lead wire and screw sleeve; This series of motors features a rotor with a permanent magnet. This technology offers significant advantages to the motor, such as higher efficiency, power factor, and higher power density.

They are driven by frequency converters that provide constant torque over a wide range of speed changes and operate even at low speeds with higher efficiency than induction motors. In addition to the energy efficiency of IE4, the motors can better achieve the efficiency of IE5 on the market today.

Detailed pictures

Demonstration of advantages:

1. Greater power density - reduced mass and volume
Permanent magnets inserted into the rotor ensure a considerable reduction in electrical losses, thereby reducing the motor temperature and making it possible to use a smaller housing size. The mass and volume of an equivalent motor are reduced by 70% compared to an induct motor with the same output power and speed. The shaft and bearings of the motor can withstand higher power and torque in a smaller housing size.

2. The motor provides superior efficiency at a full range of speeds or loads
The motor offers excellent efficiency regardless of speed or load, saving up to 30% of energy compared to inverter-driven induction motors.

3. Maintain constant torque in a wide range of speed regulation
The motor can operate with constant torque over a wide speed range. This feature makes it ideal for applications that require speed variations and constant torque, even at low speeds, without the need for an encoder. The motor is able to operate at up to 30% higher than its rated speed without the use of special components.

4. Permanent magnets
Electric motors use powerful permanent magnets. These magnets are a combination of neodymium, iron, and boron (NdFeB), commonly known as rare-earth magnets. They are 18 times stronger than traditional ferromagnets. To provide excellent mechanical strength and corrosion resistance.NdFeB magnets are covered with a protective epoxy resin coating

5. Thermal protection device

Motor windings built-in PTC(positive temperature coefficient)thermistor, or PT100 platinum thermistor, can provide comprehensive protection against overheating due to lack of phase, overload, and under voltage or overvoltage.

6. Bearing life up to 100,000 hours
The motor is equipped with bearings that can provide up to 100,000 hours of L10 life. All motors are equipped with open bearings and endcaps with refueling nozzles that allow for re-lubrication, thus reducing downtime for maintenance.

7. Universal features:
A strong and versatile foot makes motor calibration and installation easier. The rigid cast iron construction provides high mechanical strength and low vibration ratings. The fully enclosed structure can be used in a variety of harsh working conditions. it can be used with inverters from many manufacturers at home and abroad.

Differences Between The Permanent Magnet Motor And Asynchronous Motor

01. Rotor Structure

Asynchronous motor: The rotor consists of an iron core and a winding, mainly squirrel-cage and wire-wound rotors. A squirrel-cage rotor is cast with aluminum bars. The magnetic field of the aluminum bar cutting the stator drives the rotor.

PMSM Motor: The permanent magnets are embedded in the rotor magnetic poles, and are driven to rotate by the rotating magnetic field generated in the stator according to the principle of magnetic poles of the same phase attracting different repulsions.

02. Efficiency

Asynchronous motors: Need to absorb current from the grid excitation, resulting in a certain amount of energy loss, motor reactive current, and low power factor.

PMSM Motor: The magnetic field is provided by permanent magnets, the rotor does not need exciting current, and the motor efficiency is improved.

03. Volume And Weight

The use of high-performance permanent magnet materials makes the air gap magnetic field of permanent magnet synchronous motors larger than that of asynchronous motors. The size and weight are reduced compared to asynchronous motors. It will be one or two frame sizes lower than asynchronous motors.

04. Motor Starting Current

Asynchronous motor: It is directly started by power frequency electricity, and the starting current is large, which can reach 5 to 7 times the rated current, which has a great impact on the power grid in an instant. The large starting current causes the leakage resistance voltage drop of the stator winding to increase, and the starting torque is small so heavy-duty starting cannot be achieved. Even if the inverter is used, it can only start within the rated output current range.

PMSM Motor: It is driven by a dedicated controller, which lacks the rated output requirements of the reducer. The actual starting current is small, the current is gradually increased according to the load, and the starting torque is large.

05. Power Factor

Asynchronous motors have a low power factor, they must absorb a large amount of reactive current from the power grid, the large starting current of asynchronous motors will cause a short-term impact on the power grid, and long-term use will cause certain damage to the power grid equipment and transformers. It is necessary to add power compensation units and perform reactive power compensation to ensure the quality of the power grid and increase the cost of equipment use.

There is no induced current in the rotor of the permanent magnet synchronous motor, and the power factor of the motor is high, which improves the quality factor of the power grid and eliminates the need to install a compensator.

06. Maintenance

Asynchronous motor + reducer structure will generate vibration, heat, high failure rate, large lubricant consumption, and high manual maintenance cost; it will cause certain downtime losses.

The three-phase Permanent magnet synchronous motor drives the equipment directly. Because the reducer is eliminated, the motor output speed is low, mechanical noise is low, mechanical vibration is small, and the failure rate is low. The entire drive system is almost maintenance-free.