Variable Speed Direct Drive 3 Phase PMAC Motor 75kw 90kw
Brand Name:ENNENG
Certification:CE,UL
Model Number:PMM
Minimum Order Quantity:1 set
Delivery Time:15-120 days
Payment Terms:L/C, T/T
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Qingdao Shandong China
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No. 18, Xinye Road, High-Tech Zone, Qingdao,Shandong, China
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75kw 90kw Variable Speed Direct Drive 3 Phase PMAC Motor
What Is The Permanent Magnet Synchronous Motor?
The permanent magnet synchronous motor (PMSM) is an AC synchronous motor with a sinusoidal counter electromotive waveform with excitation provided by permanent magnets as the inductor. It contains the same rotor and stator as an induction motor but uses permanent magnets as the rotor to generate the magnetic field, thus eliminating the need for wind excitation windings on the rotor. It is also known as a three-phase brushless permanent magnet sine wave motor. Permanent magnet synchronous motors are very efficient, brushless, very fast, safe, and have high dynamic performance. Due to their advantages, permanent magnet synchronous motors have a variety of applications and are used in several fields.
In industrial applications, the permanent magnet synchronous motor
is an important product. Because of the use of the permanent magnet
rotor, it also has the characteristics of high torque, small seat
size, no rotor current, and so on. Instead of using windings, the
rotor installs a permanent magnet to generate a rotating magnetic
field. As there is no supply of DC source, these types of motors
are very simple and less costly. The permanent magnets enable the
PMSM to generate torque at zero speed. This motor delivers
high-efficiency operations and requires a digitally controlled
inverter.
The working principle of Permanent Magnet Motor
The working principle of pmsm motor is the same as that of the synchronous motor. PMSMs are widely used now, and like induction motors, they are commonly used AC motors.
The characteristics are: during steady-state operation, there is a constant relationship between the rotor speed and the grid frequency n=ns=60f/p, and ns is called synchronous speed.
If the frequency of the power grid is constant, the speed of the synchronous motor is constant at a steady state regardless of the size of the load.
Operating as a generator is the most important operating mode of a synchronous motor, and operating as a motor is another important operating mode of a synchronous motor.
The power factor of the synchronous motor can be adjusted. In the occasions where speed regulation is not required, the application of a large synchronous motor can improve the operating efficiency.
In recent years, small synchronous motors have been used in variable frequency asynchronous motors, also known as induction motors, which are an AC motor that generates electromagnetic torque through the interaction of the air gap rotating magnetic field and the induced current of the rotor winding, thereby realizing the conversion of electromechanical energy into mechanical energy.
Detailed pictures
Advantages of PMSM motors:
01. Low-temperature rise
The copper loss is avoided, and the rotor works without current, which significantly reduces the temperature rise of the motor.
02. Low loss, low current
The motor current is lower, the copper loss of the motor stator is correspondingly lower, and the efficiency is higher.
03. High efficiency
Permanent magnet synchronous motors have a much higher efficiency value at light load and have a wide range of high-efficiency operations.
Permanent magnet AC (PMAC) motors have a wide range of applications including:
ENNENG permanent magnet motors are widely used in different fields including mine, tire factories, oil wells, water treatment plants, and textile factories.
A few small problems that are easily overlooked about the motor:
1. Why can't general motors be used in plateau areas?
Altitude has adverse effects on motor temperature rise, motor corona (high voltage motor), and commutation of DC motor. The following three aspects should be noted:
(1) The higher the altitude, the higher the temperature rise of the motor, the lower the output power. However, when the temperature decreases with the increase of altitude enough to compensate for the influence of altitude on the temperature rise, the rated output power of the motor can remain unchanged;
(2) Anti-corona measures should be taken when the high-voltage motor is used in the plateau;
(3) The altitude is not good for the commutation of the DC motor, so pay attention to the selection of carbon brush materials.
2. Why is the motor not suitable for light load operation?
When the motor runs at a light load, it will cause:
(1) The power factor of the motor is low;
(2) The motor efficiency is low.
(3) It will cause equipment waste and uneconomical operation.
3. Why can't the motor start in a cold environment?
Excessive use of the motor in a low-temperature environment will cause:
(1) Motor insulation cracks;
(2) Bearing grease freezes;
(3) The solder powder of the wire joint is powdered.
Therefore, the motor should be heated and stored in a cold environment, and the windings and bearings should be checked before running.
4. Why can't a 60Hz motor use a 50Hz power supply?
When the motor is designed, the silicon steel sheet generally works in the saturation region of the magnetization curve. When the power supply voltage is constant, reducing the frequency will increase the magnetic flux and the excitation current, resulting in an increase in the motor current and copper consumption, which will eventually lead to an increase in the temperature rise of the motor. In severe cases, the motor may be burned due to overheating of the coil.
5. Motor soft start
Soft start has limited energy-saving effect, but it can reduce the impact of start-up on the power grid, and can also achieve smooth start to protect the motor unit. According to the theory of energy conservation, due to the addition of a relatively complex control circuit, soft start not only does not save energy, and also increases energy consumption. But it can reduce the starting current of the circuit and play a protective role.
Variable Speed Direct Drive 3 Phase PMAC Motor 75kw 90kw
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