Synchronous motor

From Wikipedia, the free encyclopedia

Jump to: navigation, search

A synchronous electric motor is distinguished by its rotor spinning at the same rate as the oscillating field which drives it. Another way of saying this is that it has zero slip under usual operating conditions. Contrast this with an induction motor, which must slip in order to produce torque.

Synchronous motors have the following advantages over non-synchronous motors :

  • Speed is independent of the load, provided an adequate field current is applied.
  • Accurate control in speed and position using open loop controls, eg. stepper motors.
  • They will hold their position when a DC current is applied to both the stator and the rotor windings.
  • Their power factor can be adjusted to unity by using a proper field current relative to the load. A leading (capacitive) P.F. can also be obtained by increasing this current slightly, which can help achieve a better power factor correction for the whole installation.
  • Their construction allows for increased electrical efficiency when a low speed is required (as in ball mills and similar apparatus).

  • Brushless permanent magnet DC motor.
  • Stepper motor.
  • Slow speed AC synchronous motor.
  • Switched reluctance motor.

v • d • e
Electric motors
Broad Motor Categories Synchronous motor • AC motor • DC Motor
Conventional Electric Motors Induction • Brushed DC • Brushless DC • Stepper • Linear • Unipolar • Reluctance
Novel Electric Motors Ball bearing • Homopolar • Piezoelectric • Ultrasonic • Electrostatic
Motor Controllers Adjustable-speed drive • Direct Torque Control • Direct on line starter • Electronic speed control • Variable-frequency drive
See also Barlow's Wheel • Nanomotor • Traction motor • Lynch motor • Mendocino motor • Repulsion motor • Inchworm motor • Booster (electric power) • Brush (electric)
Retrieved from "http://en.wikipedia.org/wiki/Synchronous_motor"
Advanced Search
Included Web Search Engines


Safe Search

close

Top Matching Results

Occasionally Search.com will highlight specialized results that are based on the context of your query. Examples of specialized results include specific links to news, images, or video.

Top Matching Results may highlight information from other Search.com pages, content from the CNET Network of sites, or third party content. The listings are based purely on relevance. Search.com does not receive payment for listings in this section but our partners that provide this data may get paid for listing these products.

Sponsored Links

This section contains paid listings which have been purchased by companies that want to have their sites appear for specific search terms and related content. These listings are administered, sorted and maintained by a third party and are not endorsed by Search.com.

Search Results

Search.com sends your search query to several search engines at one time and integrates the results into one list which has been sorted by relevance using Search.com's proprietary algorithm. You can customize the list of search engines included in your metasearch from the preferences.

The search engines that are used in your metasearch may allow companies to pay to have their Web sites included within the results. To view the Paid Inclusion policy for a specific search engine, please visit their Web site. Search.com does not accept payment or share revenue with any search engine partner for listings in this section.