The problems in elevator door-motor system and picks up the system scheme which adopts the DC brushless motor to act as driver motor based on MSP430F149 is analysed.
详细分析了目前电梯门机系统存在的问题，提出了以MSP430F149单片机为核心，无刷直流电动机为驱动机的系统方案。
The insulation methods of several DC systems are compared and analysed. A ping-pang variable bridge measurement is adopted. The ex - act on line detection of grounding resistance is realized.
比较分析了几种直流系统常用的绝缘检测方法，采用乒乓式变电桥测量法，实现了接地电阻的准确在线测量。
The insulation methods of several DC systems are compared and analysed. A ping-pang variable bridge measurement is adopted. The ex - act on line detection of grounding resistance is realized.
比较分析了几种直流系统常用的绝缘检测方法，采用乒乓式变电桥测量法，实现了接地电阻的准确在线测量。
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