Rules for the preparation of detail specifications for pulsed fixed - frequency magnetrons of assessed quality 經(jīng)質(zhì)量評定的固定頻率脈沖磁控管詳細(xì)規(guī)范編制規(guī)則
According to the variety characteristic of frequency , radio station can be divided into two types : " fixed - frequency radio " and " hop - frequency radio " 按照無線電波頻率的變化特征,無線電臺可分為“固頻電臺”和“跳頻電臺”兩大類。
In the meantime , the paper introducted the method of fixed - frequency sampling in combination with commutation method by overlap in order to hold back the torque ripple of bldcm 論文主要研究了兩相和三相無位置傳感器永磁無刷直流電機(jī)由電流換相引起的轉(zhuǎn)矩波動,推導(dǎo)出相應(yīng)的轉(zhuǎn)矩波動公式,提出一種采用定頻采樣和重疊換相相結(jié)合的方法對換相轉(zhuǎn)矩波動進(jìn)行抑制和控制。
The three - phase high - frequency ac pulse density modulation ( pdm ) converter , which is proposed in this paper , can efficiently synthesize low - distortion variable frequency variable amplitude low frequency voltage signals from the fixed - frequency voltage of the high frequency link 本文闡述的高頻交流脈沖密度調(diào)制( pdm )的控制策略能夠較容易地將高頻交流信號低失真地合成幅值和頻率變換的低頻信號。
Abstract : a new current feedback control method of brushless dc motor ( bldcm ) is introduced in this paper , which combines the traditional overlap method with the fixed - frequency sampling current control method . it both stabilizes the work frequency of the inverter , and improves the commutative performance of bldcm . and it is verified by the result of the simulation 文摘:提出一種永磁無刷直流電機(jī)電流反饋新的控制方法,即采用常規(guī)重疊換相法與定頻采樣電流控制相結(jié)合的方法,既能穩(wěn)定逆變器的工作頻率,又改善了永磁無刷直流電機(jī)的換相性能,利用仿真對提出的方法進(jìn)行了驗(yàn)證。