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31. A cogging torque measurement system was proposed , which was composed of stepping motor, torque sensor, etc.
32. Based on three dimensional finite element analyses of magnetic fields, the cogging torque of a prototype motor is calculated using the virtual work and Maxwell stress tensor methods.
33. Proposed a PDC cogging cutting angle calculation method that adapt to every complex movement condition.
34. The results showed that suitable magnet poles notching could reduce the cogging torque effectively.
35. Firstly, using finite element analysis to describe that cogging force was the main cause of force ripple in tubular permanent magnet linear motors.
36. To minimize the cogging torque, a global optimization algorithm(zooming algorithm) and the finite element method(FEM) are combined to find the best pole arc combination.
37. The design and construction of fold and directional blastings for demolition of an office building and water tower in the Second Cogging mill of Anshan Steel and Iron Corp. are expounded.
38. Second, this dissertation develops the qualitative and quantitative analysis methods for cogging torque.
39. Cogging torque is one of the most important parameters of PM motors, which causes torque ripple, vibration and acoustic noise.
40. They are also preferred in applications where no cogging and minimal torque ripple is important.
41. The calculation formula of the cogging torque are derived by the Fourier decomposition and the virtual displacement method.
42. In this thesis will discuss the suppress result of the adaptive robust controller at the effect of cogging foce.
43. The stator cogging effect is usually ignored when we calculate generator magnetic field by air gap permeance method[sentencedict.com], which lead to the generator fault information missing.
44. During manufacturing in cogging workshop, it produces a lot of oxide filing, these filings get into precipitating tank through the channel.
45. Moreover, the force ripple arose by end effect and cogging effect also exists in system.
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