Product Details
Place of Origin: China
Brand Name: ENNENG
Certification: CE,UL
Model Number: PMM
Payment & Shipping Terms
Minimum Order Quantity: 1 set
Price: USD 500-5000/set
Packaging Details: seaworthy packing
Delivery Time: 15-120 days
Payment Terms: L/C, T/T
Supply Ability: 20000 sets/year
Features: |
Small Stator Current High Capacity |
Name: |
Small Stator Current PMSM Motor |
Current: |
AC |
Material: |
Rare Earth NdFeB |
Power Range: |
5.5-3000kw |
Poles: |
2,4,6,8,10,etc. |
Protection Grade: |
IP54 IP55 IP68 IP65 |
Frequency: |
50/60Hz |
Installation: |
IMB3 IMB5 IMB35 |
Service: |
ODM, OEM |
Features: |
Small Stator Current High Capacity |
Name: |
Small Stator Current PMSM Motor |
Current: |
AC |
Material: |
Rare Earth NdFeB |
Power Range: |
5.5-3000kw |
Poles: |
2,4,6,8,10,etc. |
Protection Grade: |
IP54 IP55 IP68 IP65 |
Frequency: |
50/60Hz |
Installation: |
IMB3 IMB5 IMB35 |
Service: |
ODM, OEM |
Small Stator Current High Capacity 5.5kw-3mw PMSM Electric Motor
What Is The Permanent Magnet Synchronous Motor?
The PERMANENT MAGNET SYNCHRONOUS MOTOR is mainly composed of the stator, rotor, chassis, front-rear cover, bearings, etc. The structure of the stator is basically the same as that of ordinary asynchronous motors, and the main difference between the permanent magnet synchronous motor and other kinds of motors is its rotor.
The permanent magnet material with pre-magnetized (magnetic charged) magnetic on the surface or inside the permanent magnet of the motor, provides the necessary air gap magnetic field for the motor. This rotor structure can effectively reduce the motor volume, reduce loss and improve efficiency.
Analysis of the principle of the technical advantages of permanent magnet motor
Permanent magnet motors are electric motors that use permanent magnets instead of electromagnets to create the magnetic field required for the motor's operation. These magnets are typically made of rare-earth elements such as neodymium or samarium-cobalt, which have strong magnetic properties. The use of permanent magnets eliminates the need for a separate power source to create the magnetic field, resulting in a more efficient and compact motor design. Permanent magnet motors are commonly used in various applications such as electric vehicles, wind turbines, and industrial machinery.
Due to the use of permanent magnets to provide magnetic fields, the rotor process is mature, reliable, and flexible in size, and the design capacity can be as small as tens of watts, up to megawatts. At the same time, by increasing or decreasing the number of pairs of rotor permanent magnets, it is easier to change the number of poles of the motor, which makes the speed range of permanent magnet synchronous motors wider. With multi-pole permanent magnet rotors, the rated speed can be as low as a single digit, which is difficult to achieve by ordinary asynchronous motors.
Especially in the low-speed high-power application environment, the permanent magnet synchronous motor can be directly driven by a multi-pole design at low speed, compared with an ordinary motor plus reducer, the advantages of a permanent magnet synchronous motor can be highlighted.
PM Motor Structure
PM motor structures can be separated into two categories: interior and surface. Each category has its subset of categories. A surface PM motor can have its magnets on or inset into the surface of the rotor, to increase the robustness of the design. An interior permanent magnet motor positioning and design can vary widely. The IPM motor’s magnets can be inset as a large block or staggered as they come closer to the core. Another method is to have them embedded in a spoke pattern.
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.
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.
Advantages of Permanent Magnet Synchronous Motors
01. Low loss and low-temperature rise
Since the magnetic field of the permanent magnet synchronous motor is generated by the permanent magnet, the driving loss caused by the magnetic field generated by the driving current, that is, the copper loss is avoided; the rotor works without current, which significantly reduces the temperature rise of the motor and the temperature rise is less than 20K under the same load.
02. High power factor
A permanent magnet synchronous motor has a high power factor, independent of the number of poles of the motor. When the motor is fully loaded, the power factor of the motor is close to 1. Compared with the asynchronous motor, the motor current is lower, the copper loss of the motor stator is correspondingly lower, and the efficiency is higher. As the number of motor poles increases, the power factor of an asynchronous motor is getting lower and lower. In addition, due to the high power factor of the permanent magnet synchronous motor, the capacity of the power supply (transformer) matched with the motor can theoretically be reduced, and the specifications of the supporting switch cabinet and cables can be reduced at the same time.
03. High efficiency
Compared with asynchronous motors, permanent magnet synchronous motors have a much higher efficiency value at light load and have a wide range of high-efficiency operations. The efficiency is greater than 90% in the range of 25% to 120%. The rated efficiency of the permanent magnet synchronous motor can reach 1 time the current national standard energy efficiency level, which is its biggest advantage in energy saving compared with the asynchronous motor. In actual operation, the motor rarely runs at full power when driving a load. The reason is: On the one hand, when the designer selects the motor, the motor power is generally determined according to the extreme working conditions of the load, and the possibility of extreme working conditions is very small. At the same time, in order to avoid burns under abnormal working conditions To ensure reliability of the motor, the motor manufacturer will generally leave a certain power margin on the basis of the power required by the user to ensure the reliability of the motor. This leads to the actual operation of the motor, most of the work is below 70% of rated power, especially to drive fans or pump loads, the motor generally works in the light load area. For asynchronous motor, its light load efficiency is very low, while permanent magnet synchronous motor can still keep high efficiency in the light load area.
04. Other advantages
The permanent magnet synchronous motor also has the advantages of high starting torque, short starting time, and high overload capacity. It can reduce the installed capacity of the equipment drive motor according to the actual shaft power, save energy and reduce investment in fixed assets. The permanent magnet synchronous motor is easy to control, has a constant speed, does not change with load fluctuations or voltage fluctuations, only depends on frequency, and runs smoothly and reliably. Because the speed is strictly synchronized, the dynamic response performance is good, and it is suitable for frequency conversion control. The installation dimensions of the permanent magnet synchronous motor meet the IEC standard, which can directly replace the three-phase asynchronous motor, and the protection level can reach IP54 and IP55.
2. The disadvantages of permanent magnet motors:
01. High cost of permanent magnet materials
02. Under the condition of high temperature, vibration and overload current, the permanent magnet material will be irreversibly demagnetized, which will affect the performance of the motor.
03. High requirements for the control system
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