Why the Permanent Magnet AC Motor Is Special | Duke Electric

Because PMAC motors do not require any electrical current, they can be more efficient because they are not incurring electrical losses. This also means that less heat is generated, which leads to improved operational life and, therefore, reliability.

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PMAC&#;s also have a higher torque capacity and better torque utilization with faster acceleration. Further, its compact design with high torque density and less weight mean it can fit into smaller spaces. A higher continuous torque over a wide range of speeds is an added benefit, with lower rotor inertia and higher dynamic performance under load.

PMACs are expensive, often three times the price of induction motors. They can also be hard to maintain and operate as magnets on the rotor make the rotor hard to remove and replace. The magnets can even attract nearby equipment and machinery, which can be a real hazard. And believe it or not, permanent magnets aren&#;t always permanent and can have limited capabilities. Certain forces can demagnetize the magnets if the material is strained, permitted to reach high temperatures, or is impacted by a significant electrical disturbance.

Another disadvantage of PMACs is that they generate electricity in a freewheeling load situation (freewheeling or flyback is defined as a sudden increase in voltage across the inductive load when the current through the circuit shows a reduction), which makes them dangerous to work on because they can cause electric shock or death.

Although the initial cost of permanent magnet motors can be high, this can be offset by the efficiency gains and longer operational life. If speed control is required and the motor is meant to operate at reduced speeds, permanent magnet motors have greater appeal. Typical industries include water and wastewater, pulp and paper, and air handling. Common applications include pumps, fans, mixers, power generation, and paper machines.

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If you&#;ve got a broken unicorn on your hands or just a regular old motor, we&#;d love to see it and get it back up and running again. From big iron to high-tech servo, marine generators to water treatment plant pumps, hospital HVAC systems to aggregate kilns, we&#;ll get your AC and DC equipment up and running &#; or tell you what your options are.

You will find permanent magnet motors in any number of appliances in your daily life, from toothbrushes to mobility solutions; but what exactly are they and what are their advantages? In this article, we will focus on PMDC motors, which are the most common type of permanent magnet motor. As trusted manufacturers of motors for 75 years, Parvalux PMDC motors are specified by manufacturers in a huge range of industries.

What is a PMDC Motor?

Like an AC motor, a permanent magnet motor uses electromagnetism to generate torque. PMDC motors have permanent magnets in the stator that provide the magnetic field needed to make it function. This is an alternative to traditional brushed or brushless DC motor, where the magnetic field is created in the stator windings..

As the magnets are fixed in a permanent magnet motor, you cannot control the magnetic field strength externally. This means that you are likely to find PMDC motors in applications where the speed doesn&#;t need to be controlled. This being said, control can be achieved by controlling armature voltage, so they are not necessarily excluded from use in industries where speed and torque need to vary.

They are an excellent choice for products in the leisure and healthcare industries because PMDC motors offer an impressive output and are high performance, despite being generally smaller than other motors.

Advantages of PMDC Motors

• Smaller in size &#; As mentioned above, PMDC motors are generally smaller than other motors, but this doesn&#;t mean they are less useful. In fact, they are perfect for small applications such as windshield wipers, air conditioning units and even electric toothbrushes. This also helps with portability, making them easy to transport globally.
• Use in multiple applications &#; Permanent magnet motors can be used in a variety of industries because they can be designed to meet a number of needs, such as size and power. You are just as likely to find a PMDC motor in a computer drive, as you are in a child&#;s toy.
• High starting torque &#; Like other DC motors, PM motors have a high start-up power, making them perfect for a variety of industries. Despite a lower speed, these motors are still very reliable and when combined with one of our gearboxes they create the ultimate geared motor solution.
• Cost-Effective &#; Due to their smaller size and lack of field windings, permanent magnet motors are a reliable and cheaper option for your application. At Parvalux, we can create a custom solution for your application, ensuring you have a long-lasting motor that works to your precise specification.

Depending on whether you are using it as a motor-only or in combination with a gearbox, any Parvalux permanent magnet DC motor can be built to fit your power requirements.

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