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本文依据作者所参加的科研成果写的。在研制录像机的鼓磁头稳速系统时,为提高稳速精度,特研制了一种数字式的鉴频器作为差值测速元件,由此构成的稳速环达到了较高的稳速精度。本文针对采用了数字式鉴频器构成的稳速环进行理论分析,建立了这种采样系统的数学模型,分析了系统稳定性,讨论了各种扰动对稳速精度的影响,为进一步改进系统性能指出了方向。
This article is based on the author’s participation in scientific research. In the development of video tape recorder drum head steady speed system, in order to improve the speed precision, specially developed a digital frequency discriminator as the differential speed measuring element, the resulting stable speed ring to achieve a higher speed precision. In this paper, a theoretical analysis is made on the steady-speed loop using a digital frequency discriminator, and the mathematical model of the sampling system is established. The stability of the system is analyzed, and the influences of various disturbances on the speed stability are discussed. In order to further improve the system Performance pointed out the direction.