Advantages of Permanent Magnet AC Motors (PMAC)
Advantages of Permanent Magnet AC Motors (PMAC)
Permanent magnet AC and AC induction motors comprise the majority of electric motors sold worldwide and total more than 70% of electric motor sales in . AC motors are used extensively throughout numerous industries to drive various devices, from fans and pumps to HVAC systems, appliances, power tools, and electric vehicles. Demand for higher efficiencies from government agencies has driven advances in AC motor manufacturing processes and innovative motor designs that improve not only efficiencies but also motor life. This article covers the pros and cons of the two leading AC motor technologies.
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A permanent magnet AC motor uses magnets embedded in or attached to the surface of the rotor. The magnets provide a constant magnetic field that interacts with the electromagnetic field of the stator to produce motor rotation. In contrast, to create motion, the AC induction motor requires stator excitation to generate a magnetic field that then induces current within aluminum bars integrated in the rotor. The electromechanical design of the PMAC motor provides advantages associated with efficiency, power density, dynamic response, and speed range.
PMAC motors have significant advantages over AC induction motors but also have many drawbacks to consider, such as cost, temperature range, demagnetization, and control complexity.
With additional pressures to reduce energy consumption, motor efficiency becomes an important factor in AC motor topology selection. PMAC motors provide clear advantages with efficiency, usable speed range, dynamic response time, and can reduce the physical dimensions and weight of the motors. It's important to note that the specific advantages and disadvantages will vary due to the specific design, application, and technological advancements in motor manufacturing.
7 Advantages of Permanent Magnet DC Motor
What is a Permanent Magnet DC Motor? You need to understand Permanent Magnet DC (or PMDC) Motors whenever you purchase an electric motor for sale for instance. With PMDC, the magnets are mounted on the inner periphery of a cylindrical steel stator. The magnets of the PMDC are radially magnetized. With PMDC the stator provides a return path for the magnetic flux. Additionally, the rotor has commutator segments, brushes, and a DC armature.
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Popular Uses for the PMDC
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These motors can be used in cars for windshield wipers, controlling windows, and car air conditioners. A PMDC electric motor for sale can also provide power for computer drives, toys, food mixers, and hedge trimmers. Therefore, they have many applications. Most importantly, LN Electric has an impressive stock of all types of motors for your needs, including the PMDC.
Key Advantages of Permanent Magnet DC Motors
Moreover, you can find many reasons to use PMDC motors. Talk to our experienced staff about the benefits of the PMDC. What are some of the key advantages? They have specific benefits, including:
- Portability in size
- Less expensive
- Lower manufacturing costs
- Do not require field winding
- No field circuit copper losses
- Increased efficiency overall
- Multiple application use
The PMDC are developed to about 200 kW for most applications. More importantly, they have uses both in the home and in industry. They can have up to fractions to several horsepowers depending on the application. This gives them a wide range of applications from computers to cars to appliances.
Types of Permanent Magnetic Materials
Find out about several types of permanent magnetic materials that have been used in PMDC construction: Alnicos, Ferrites, and Rare Earths. Each has its own unique uses and advantages.
- Alnicos &#; Used with high voltage and low current
- Ferrites &#; Cost-sensitive applications
- Rare Earths &#; Expensive material used for size-sensitive applications
To sum up, rare earth magnets can be used in servo industrial drives, large industrial motors, and cars. Use ferrites materials for compressors, refrigerators, and compressors.
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