07.F5 B3A-0A0A變頻器優(yōu)質(zhì)貨源
1: VVVF 是 Variable Voltage and Variable Frequency 的縮寫，意為改變電壓和改變頻率，也就是人們所說的變壓變頻。
2: CVCF 是 Constant Voltage and Constant Frequency 的縮寫，意為恒電壓、恒頻率，也就是人們所說的恒壓恒頻。
VVC的控制原理
在VVC中，控制電路用一個(gè)數(shù)學(xué)模型來計(jì)算電機(jī)負(fù)載變化時(shí)最佳的電機(jī)勵(lì)磁，并對(duì)負(fù)載加以補(bǔ)償。
此外集成于ASIC電路上的同步60°PWM方法決定了逆變器半導(dǎo)體器件（IGBTS）的最佳開關(guān)時(shí)間。
決定開關(guān)時(shí)間要遵循以下原則：
數(shù)值上最大的一相在1/6個(gè)周期（60°）內(nèi)保持它的正電位或負(fù)電位不變。
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