安装同步电机时要仔细阅读厂家说明书,吊装就位后按要求找正,测定转子与定子间的气隙,符合要求后再固定轴承座。整体安装完毕后进行电气试验,各项试验合格后才能试运行。近年来,河南黄金建筑安装公司安装的溢流型球磨机的拖动电机从800~...安装同步电机时要仔细阅读厂家说明书,吊装就位后按要求找正,测定转子与定子间的气隙,符合要求后再固定轴承座。整体安装完毕后进行电气试验,各项试验合格后才能试运行。近年来,河南黄金建筑安装公司安装的溢流型球磨机的拖动电机从800~3 000 k W不等。现以TM1850-30/2860中型同步电机为例,探讨同步电机的安装与调试。展开更多
In making purchasing decisions, consumers look to online reviews posted by others who have used or experienced the product/service. Most existing studies on online reviews only focused on their content without address...In making purchasing decisions, consumers look to online reviews posted by others who have used or experienced the product/service. Most existing studies on online reviews only focused on their content without addressing how their explanation type influences purchasing decisions, not to mention the boundary conditions for such effects. Based on three experimental studies, this paper examines how explanation type affects the perceived usefulness of online reviews and purchasing decisions, and discusses the boundary conditions for such effects. Our findings show that positive explanation type has a positive effect on the perceived usefulness of online reviews, while negative explanation has an insignificant impact. For search products, there is a positive correlation between the online reviews of explained actions and the perceived usefulness of consumer reviews. For experience products, there is a positive correlation between the online reviews of explained reactions and the perceived usefulness of consumer reviews. Further research found that temporal distance may moderate the effects of explanation type and product type on the perceived usefulness of online reviews. This study also provides a new approach for research on the word-of-mouth(WOM) with meaningful implications for e-commerce firms.展开更多
This paper presents the composition, control scheme and signal processing method of frequency conversion motor speed testing system based on $7-200 PLC, and design the hardware circuit, the trapezoidal chart procedure...This paper presents the composition, control scheme and signal processing method of frequency conversion motor speed testing system based on $7-200 PLC, and design the hardware circuit, the trapezoidal chart procedure and touch screen display program. The debugging test shows that the system is simple, practical, and related design work has laid the foundation for the future.展开更多
This paper introduces the design of doubly fed system for conveyor belt motor, the system adopts stator flux orientation vector control technology and AC-AC inverter motor speed and power factor control, and carried o...This paper introduces the design of doubly fed system for conveyor belt motor, the system adopts stator flux orientation vector control technology and AC-AC inverter motor speed and power factor control, and carried on the test in transmission field. This paper introduces in detail the structure and characteristic of DSP system, and gives a design scheme of Doubly Fed Speed Control System of motor based on this chip.展开更多
文摘安装同步电机时要仔细阅读厂家说明书,吊装就位后按要求找正,测定转子与定子间的气隙,符合要求后再固定轴承座。整体安装完毕后进行电气试验,各项试验合格后才能试运行。近年来,河南黄金建筑安装公司安装的溢流型球磨机的拖动电机从800~3 000 k W不等。现以TM1850-30/2860中型同步电机为例,探讨同步电机的安装与调试。
基金Supported by"Reputation Sharing Mechanism and Recourse Liability Policy of E-commerce Platform:An Interactive Perspective of Platform Enterprise and Its Sellers"Project of the National Natural Science Foundation of China(NSFC)(Grant No.71672026)"Influencing Mechanism of User-generated Content on Brand Equity of Multichannel Retailers under the Regulatory Focus Paradigm"of the NSFC(Grant No.71272050)
文摘In making purchasing decisions, consumers look to online reviews posted by others who have used or experienced the product/service. Most existing studies on online reviews only focused on their content without addressing how their explanation type influences purchasing decisions, not to mention the boundary conditions for such effects. Based on three experimental studies, this paper examines how explanation type affects the perceived usefulness of online reviews and purchasing decisions, and discusses the boundary conditions for such effects. Our findings show that positive explanation type has a positive effect on the perceived usefulness of online reviews, while negative explanation has an insignificant impact. For search products, there is a positive correlation between the online reviews of explained actions and the perceived usefulness of consumer reviews. For experience products, there is a positive correlation between the online reviews of explained reactions and the perceived usefulness of consumer reviews. Further research found that temporal distance may moderate the effects of explanation type and product type on the perceived usefulness of online reviews. This study also provides a new approach for research on the word-of-mouth(WOM) with meaningful implications for e-commerce firms.
文摘This paper presents the composition, control scheme and signal processing method of frequency conversion motor speed testing system based on $7-200 PLC, and design the hardware circuit, the trapezoidal chart procedure and touch screen display program. The debugging test shows that the system is simple, practical, and related design work has laid the foundation for the future.
文摘This paper introduces the design of doubly fed system for conveyor belt motor, the system adopts stator flux orientation vector control technology and AC-AC inverter motor speed and power factor control, and carried on the test in transmission field. This paper introduces in detail the structure and characteristic of DSP system, and gives a design scheme of Doubly Fed Speed Control System of motor based on this chip.
