The document discusses the basics of brushless DC motors including their structure, operating principle, drive circuits, and applications. It compares brushless DC motors to conventional DC motors, noting that brushless motors are more efficient, require less maintenance, and can operate at higher speeds. Some key applications mentioned are in laser printers, hard disks, and devices where high efficiency, small size, and precise speed control are important.

1. A Seminar on Brushless DC Motors

3. Basic Structure

5. Principle of brushless DC motor

6. Comparison of conventional and brushless dc motors

7. Drive circuits Unipolar drive Bipolar drive

8. Unipolar drive

9. Bipolar drive

10. Applications Laser printer

11. Hard disk drive

12. Comparison of an ac synchronous motor and a brushless dc motor for an 8-inch hard disk drive

13. Efficiency Comparison brush DC to Brushless DC

14. ADVANTAGES It is more efficient. Need less maintenance. It can operate higher speeds than conventional dc motor. High efficiency & small size are especially important for military, aircraft, & automotive application. Speed accuracy is very high. Speed control over a very wide speed range.

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