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6.环路的跟踪若输入信号的频率和环路参数皆稳定不变,并无内、外干扰的影响,则环路的锁定点也就稳定不变,反之则可能引起锁定点变化,形成相位误差。这在叙说环路调整过程时已有所提及(见第3节)。而如前述,传感器精转角转换数码是依靠测量参考和可变二信号的相位差而获得的。由于使用了锁相倍频环路,实际上最终获得的数码是反应了参考和可变锁相倍频环路反馈信号间的相位差。所以锁定点的任何变化皆能形成转换误差,这当然是我们非常关心的,也是希望尽量减小的。为此要对各种可能情况作一些必要的说明和计算。
6. Loop tracking If the input signal frequency and loop parameters are stable and no internal and external interference, the lock point of the loop will be stable, otherwise it may cause changes in the lock point to form Phase error. This is already mentioned in the narrative loop adjustment process (see section 3). As mentioned earlier, the sensor corner conversion digital precision is obtained by measuring the phase difference between the reference and variable two signals. Due to the use of a lock-in frequency multiplier loop, the resulting digital actually reflects the phase difference between the reference and variable-phase-locked multiplier loop feedback signals. So any change in the lock point can create a conversion error, which of course we are very concerned about, but also hope to minimize. To do this, we must make some necessary explanations and calculations for possible situations.