permanent magnet

Articles About permanent magnet


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1 High-Tech Motors Evolving from PM Muck (September 2014)

University lab's motor eliminates pricey rare-earth magnets.

2 Brushless PM-Motors Speed Ahead (June 2014)

There are more brushless PM motors being made every day. These brushless PM motors are smaller in size -- i.e., less than 50 watts in power output found in hard-disk drives, CD and DVD players and many portable medical devices. Servo systems with brushless PM motors ranging from 50 watts to 50 kilowatts are now challenging the larger electric motor applications. A few manufacturers have pushed brushless PM motors above 200 kW.

3 Book Review: Design of Permanent-Magnet Brushless Machines (October 2010)

The latest offering by machine design experts J.R. Hendershot and T.J.E. Miller is an 822-page brushless permanent-magnet (PM) machine design book that serves as a worthy follow-up to their 1994 work.

4 Lightweight, Highly Efficient Drive System (February 2017)

This paper presents a joint project conducted by Ashwoods Electric Motors and Oerlikon Fairfield that uses planetary drives with an integrated electric motor. Current solutions used in production of off-highway vehicles rely upon large, heavy and inefficient brushed DC or induction motors, coupled to a planetary gearbox. This presents a number of challenges to the vehicle designers such as: limited vehicle range, limited space around the motor/drivetrain, and motor durability. The proposed integrated system utilizes an Oerlikon Fairfield Torque Hub, widely used in off-highway vehicles, and the Ashwoods first-to-market, interior permanent magnet motor. How these products are integrated, i.e. incorporating a brake solution, represents a market-changing product. Using interior permanent magnet (IPM) technology in the motor design means the motor can be up to 70% lighter, 70% smaller and 20% more efficient than traditional motors used in off-highway traction applications.

5 The Reluctance Motor Springs Forth (August 2014)

There are three major types of reluctance motors: all three reluctance motors are non-permanent magnet, brushless motors. They are synchronous motors with a non-linear relationship between torque and current. The variable-reluctance step and switched-reluctance motors utilize the principle of magnetic attraction by inducing magnet poles within the soft-iron rotor, and by energizing a set of coils wound around stator teeth resident in the laminated stator. These two reluctance motors must be sequentially excited to achieve continuous, steady-state rotation. The design of all reluctance motors requires finite element analysis (FEA) software.

6 The Green Spin: Baldor Redefines Cooling Tower Performance (February 2011)

The Baldor Reliance RPM AC Cooling Tower Direct Drive Motor is designed exclusively for the cooling tower industry. This motor combines the technologies of the power-dense, laminated frame RPM AC motor with high performance, permanent magnet salient pole rotor designs.

7 Industry News (October 2017)

The complete Industry News section from the October 2017 issue of Power Transmission Engineering.

8 Have a Pump, Motor, Generator, Turbine, Compressor or Gearbox - There is a Bearing for That! (October 2012)

Waukesha Bearings is known internationally for its capabilities, technology, size and application experience in the rotating (turbo) equipment industry. Following is a brief selection guide intended to assist engineers, specifiers, integrators and others in choosing the right bearing—and bearing technology—for the application.

9 Achieving High Electric Motor Efficiency (April 2012)

The use of motor structures which can concentrate magnetic flux allows ferrite PM motors to achieve performance and power densities that approach those of PM motors using rare earth magnets, but without the cost penalties and supply source concerns of rare earth magnets.

10 Frictionless, Magnetic Gears and Couplings Gain Traction (February 2010)

The Magnetic Gearing and Turbine Corp. (MGT), founded by Australian inventor Andrew French in 2000, manufactures injection molded gears and couplings based entirely on magnetic technology. The repulsive magnetic forces are used to transmit power without losing any energy, and drive shafts rotate completely independently of each other.

11 Product News (February 2010)

The complete Product News section from the February 2010 issue of Power Transmission Engineering.

12 Industry News (February 2012)

The complete Industry News section from the February 2012 issue of Power Transmission Engineering.

13 Electromagnetic Know-How (August 2012)

Finite Element Analysis (FEA) software can be used for a variety of mechanical engineering tasks, including injection molding simulation of plastic parts, analysis of aerospace components, impact and crash analysis of automobiles and the electromagnetic analysis of motors, actuators, transformers and sensors.

News Items About permanent magnet

1 Ogura Releases Permanent Magnet Brake (March 19, 2013)
A new high torque permanent magnet brake, model PMB-06 is now available from Ogura. The new model has a smaller diameter than the size 07...

2 Permanent Magnet Brakes Apply Controlled Stop (September 29, 2008)
Like spring applied brakes, permanent magnet brakes are applied when power is lost. However, unlike spring applied brakes, permanent magn...

3 Permanent Magnet Motor Offers Efficiency Gains (April 17, 2013)
SyMAX IHP (integral horsepower) is a permanent magnet AC motor range whose radial flux design delivers high torque, ultra high efficiency...

4 SG Transmission Designs Curved Permanent Magnet Brake (February 16, 2017)
SG Transmission has designed a curved permanent magnet brake to be used in specialist medical equipment. The customized brake has be...

5 Ogura Highlights Permanent Magnet Brakes in Latest Animation Video (October 9, 2018)
Ogura has created a new animation showing how permanent magnet brakes work.  The animation shows an exploded view of the component...

6 SG Transmission Customizes Permanent Magnet Brake (April 17, 2018)
SG Transmission has designed a custom made, size Ø50 permanent magnet brake, for a major global motor manufacturer, which will m...

7 NEMA Publishes New Guide for Permanent Magnet Motors (March 9, 2018)
Today, the National Electrical Manufacturers Association (NEMA) published a new standard NEMA SM 1-2017 Guide to General-Purpose Synchr...

8 Baldor Expands RPM AC Permanent Magnet Products (August 5, 2011)
Baldor Electric Company, a Fort Smith, Arkansas-based manufacturer of energy efficient industrial electric motors, drives, mechanical pow...