IE4 IE5 Three Phase Direct Drive Permanent Magnet AC Motor

Benefits of PMSM motors:
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High efficiency
This is particularly true at lower speeds. The permanent magnet motor does not require current to be supplied to its rotor to generate the rotor field, therefore eliminating the rotor losses almost completely. When compared to induction or reluctance motors it also requires lower currents on the stator and has a bigger power factor, leading to smaller current ratings on the controller, and increasing the overall drive system efficiency.

Driving lower speeds at higher efficiency than an induction motor might delete the requirement of a speed-reduction transmission, taking the complexity out of the mechanical arrangement.

Constant torque
This type of motor can generate constant torque and maintain full torque at low speeds.

Size
The smaller size, lighter weight, and less coil provide a higher power density.

Cost-effective
With the absence of brushes, there are reduced maintenance costs.

Minimal heat
In PMSM the heat is generated on the stator coils and there are no brushes and only minimal heat generated on the rotor, facilitating the cooling of the motor. As they run cooler than induction motors, the motor's reliability and lifespan are increased.

Speed range
This type of motor can have a wide speed range with the use of Field Weakening and can adopt the maximum torque/current (MTPA) control strategy during constant torque operation.

Permanent magnet AC (PMAC) motors have a wide range of applications including:

Industrial Machinery: PMAC motors are used in a variety of industrial machinery applications, such as pumps, compressors, fans, and machine tools. They offer high efficiency, high power density, and precise control, making them ideal for these applications.

Robotics: PMAC motors are used in robotics and automation applications, where they offer high torque density, precise control, and high efficiency. They are often used in robotic arms, grippers, and other motion control systems.

HVAC Systems: PMAC motors are used in heating, ventilation, and air conditioning (HVAC) systems, where they offer high efficiency, precise control, and low noise levels. They are often used in fans and pumps in these systems.

Permanent magnet synchronous motors with internal magnets: Maximum energy efficiency

The permanent magnet synchronous motor with internal magnets (IPMSM) is the ideal motor for traction applications where the maximum torque does not occur at maximum speed. This type of motor is used in applications that require high dynamics and overload capacity. And it is also the perfect choice if you want to operate fans or pumps in the IE4 and IE5 range. The high purchase costs are usually recouped through energy savings over the run time, provided that you operate it with the right variable frequency drive.

Our motor-mounted variable frequency drives use an integrated control strategy based on MTPA (Maximum Torque per Ampere). This allows you to operate your permanent magnet synchronous motors with maximum energy efficiency. The overload of 200 %, the excellent starting torque, and the extended speed control range also allow you to fully exploit the motor rating. For fast recovery of costs and the most efficient control processes.

IPM (Interior Permanent Magnet) Motor Features:

High torque and high efficiency
High torque and high output are achieved by using reluctance torque in addition to magnetic torque.

Energy-saving operation
It consumes up to 30% less power compared to conventional SPM motors.

Safety
Since the permanent magnet is embedded, mechanical safety is improved as, unlike in an SPM, the magnet will not detach due to centrifugal force.

Permanent magnet synchronous motors with external magnets for classic servo applications

Permanent magnet synchronous motors with external magnets (SPMSM) are ideal motors when you need high overloads and rapid acceleration, for example in classic servo applications. The elongated design also results in low mass inertia and can be optimally installed. However, one disadvantage of the system consisting of SPMSM and variable frequency drive is the costs associated with it, as expensive plug technology and high-quality encoders are often used.

Renewable Energy Systems: PMAC motors are used in renewable energy systems, such as wind turbines and solar trackers, where they offer high efficiency, high power density, and precise control. They are often used in the generators and tracking systems in these systems.

Medical Equipment: PMAC motors are used in medical equipment, such as MRI machines, where they offer high torque density, precise control, and low noise levels. They are often used in the motors that drive the moving parts in these machines.

A few small problems that are easily overlooked about the motor:

1. 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.

2. 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.

3. 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.

4. Motor soft start

The soft start has a limited energy-saving effect, but it can reduce the impact of start-up on the power grid, and can also achieve a smooth start to protect the motor unit. According to the theory of energy conservation, due to the addition of a relatively complex control circuit, a soft start not only does not save energy but also increases energy consumption. But it can reduce the starting current of the circuit and play a protective role.

How to choose a three-phase permanent magnet synchronous motor?

Selecting a three-phase permanent magnet synchronous motor requires consideration of several factors, including the motor's power, speed, materials, manufacturing process, and so on.

Motor Power

Motor power is an important parameter of the motor, which determines the maximum output power of the motor and the applicable scene. When selecting a three-phase permanent magnet synchronous motor, you need to determine the power range of the motor according to the actual demand and select the appropriate motor type and parameters.

Motor Speed

Motor speed is also a factor to be considered in the selection process. Different application conditions require different motor speeds, and it is necessary to determine the speed range of the motor according to the actual needs and select the appropriate motor type and parameters.

Motor Material

Motor material is one of the important factors in motor design and selection. This property directly affects the performance and service life of the motor. Common motor materials include copper wire, magnets, insulation materials, etc. When selecting three-phase permanent magnet synchronous motors, it is necessary to choose appropriate motor materials and adopt appropriate processing technology and quality inspection measures.

Manufacturing process

Common manufacturing processes include winding, pole processing, assembly, and so on. When selecting three-phase permanent magnet synchronous motors, it is necessary to adopt appropriate manufacturing processes and quality inspection measures to ensure that the performance and quality of the motor meet the requirements.

Future outlook

From the technical aspect, in the future, the design and manufacturing technology of three-phase permanent magnet synchronous motors will continue to be improved and upgraded. New materials can improve the performance and service life of the motor, such as new magnetic materials. The improvement of motor control technology can realize more precise control and higher efficiency. Advances in motor sensor technology can improve the measurement and control accuracy of the motor so that the performance of the motor can be further improved.

From the application aspect, the application range of three-phase permanent magnet synchronous motors will continue to expand and deepen. The application of three-phase permanent magnet synchronous motors in the field of industrial automation will continue to expand, such as belt conveyors, textile machines, and so on. In the future, three-phase permanent magnet synchronous motors will be more efficient, precise and reliable, providing better solutions for various industries.