变频器的加、减速功能(上)

• 作 者: 张燕宾
• 出 处: 家电检修技术
• 发表日期: 2005年06期
• 关键词: 变频器 加速过程 电动机 减速时间 工频电源 全压起动 变频起动 直接起动 加速时间 转速

一、加、减速时间与方式1.基本概念(1)工频起动和变频起动:电动机从较低转速升至较高转速的过程称为加速过程,加速过程的极限状态便是电动机的起动。1)工频起动:这里所说的工频起动,是指电动机直接接上工频电源时的起动,也叫直接起动或全压起动,如图1a所示。

First, plus, deceleration time and mode 1. Basic concepts (1) Power frequency starting and frequency starting: the motor from lower speed to higher speed is called the acceleration process, the acceleration process is the limit state is the motor start. 1) Power frequency starting: The power frequency starting mentioned here refers to the starting when the motor is directly connected to the power frequency power supply, also called direct starting or full voltage starting, as shown in FIG. 1a.