Why the Permanent Magnet AC Motor Is Special | Duke Electric

Why the Permanent Magnet AC Motor Is Unique | Duke Electric

Permanent Magnet AC (PMAC) motors don't require electrical current to function, which enhances their efficiency by eliminating electrical losses. This leads to reduced heat generation, consequently extending the operational lifespan and reliability of the motor.

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PMAC motors exhibit superior torque capacity and improved torque utilization, providing faster acceleration. Their compact structure enables high torque density while minimizing weight, allowing them to be installed in confined spaces. An advantage of PMACs is their ability to deliver higher continuous torque across a broad range of speeds, supplemented by lower rotor inertia resulting in notable dynamic performance even under load.

However, PMAC motors come with a high price tag, often costing three times as much as induction motors. This can also complicate maintenance and operation since the magnets on the rotor make it challenging to replace or remove the rotor. Furthermore, the magnets are capable of attracting nearby equipment, posing potential hazards. It's crucial to note that permanent magnets can lose their magnetism, becoming demagnetized if exposed to extreme strain, elevated temperatures, or significant electrical disturbances.

Another risk associated with PMACs is their generation of electricity during freewheeling load situations. Freewheeling refers to a sudden voltage surge across the inductive load when the current in the circuit decreases, which raises safety concerns as it can lead to electric shock or fatal accidents.

Despite the high initial cost of permanent magnet motors, the benefits derived from their efficiency and longer operational lifespan often compensate for this investment. They're particularly appealing when speed control is required, especially in operations that involve lower speeds. Industries like water and wastewater management, pulp and paper production, and air handling commonly utilize PMAC motors, with typical applications ranging from pumps and fans to mixers and power generation equipment.

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If you have an inoperative motor, whether it's a high-tech servo or a standard motor, we would be happy to help you restore it. From large industrial generators to water treatment plant pumps, and HVAC systems in hospitals to aggregate kilns, we have the expertise to get your AC and DC equipment performing optimally or to present suitable alternatives.

Permanent magnet motors are commonly found in a variety of appliances in our daily routines, from electric toothbrushes to mobility solutions. But what makes them so special? In this section, we'll focus on PMDC motors, which are the most prevalent form of permanent magnet motors. With 75 years of experience, Parvalux manufactures PMDC motors chosen by a wide array of industries.

Understanding PMDC Motors

Similar to AC motors, permanent magnet motors utilize electromagnetism to generate torque. PMDC motors have permanent magnets positioned in the stator, which produce the necessary magnetic field for operation. This contrasts with traditional brushed or brushless DC motors that generate the magnetic field through stator windings.

Since the magnets are fixed in a PMDC motor, you cannot adjust the magnetic field strength externally. Consequently, PMDC motors are generally found in applications where speed control is unnecessary. Nevertheless, by varying the armature voltage, some degree of control can still be obtained, making them versatile for industries requiring changes in speed and torque.

Due to their impressive output and high performance, PMDC motors are ideal for products in the leisure and healthcare sectors, even though they are typically smaller than their counterparts.

Benefits of Using PMDC Motors

• Compact Size: As highlighted, PMDC motors are generally more compact than other types. This characteristic makes them suitable for tightly spaced applications like windshield wipers and air conditioning units, in addition to enhancing portability for global transport.
• Diverse Applications: Permanent magnet motors can adapt to various industry requirements concerning size and power. You can find a PMDC motor in anything from a computer drive to a child's toy.
• High Startup Torque: PM motors are known for their reliable high starting torque, making them suitable for several industries. Even at lower speeds, these motors work effectively and, when paired with our gearboxes, create an optimal geared motor solution.
• Cost-Effectiveness: The compactness and absence of field windings in permanent magnet motors result in significant cost savings for your application. At Parvalux, we specialize in creating custom solutions that deliver long-lasting performance tailored to your specifications.

Whether deployed as standalone motors or in conjunction with gearboxes, any Parvalux permanent magnet DC motor can be customized to meet your specific power requirements.

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