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.
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.
