A servo motor is a device that rotates the parts of a machine with the help of a servo drive. The servo drive amplifies signals (analog or digital) and sends it to the servo motor that ultimately controls the speed and precision of the shaft (end component of a servo system). A servo motor is a combination of a regular motor and a sensor for positional feedback. The controller is one of the important components of the servo motor that is designed to control the positioning of the servo motor. A servo motor is a closed-loop mechanism that incorporates positional feedback to control rotational or linear speed. It is an amalgamation of several parts and combinations.

国家发改委、国家能源局联合发布《关于加快推动新型储能发展的指导意见（征求意见稿）。征求意见稿从顶层设计为储能行业健康发展提供指引，有望对国内储能需求和产业链形成重大催化，对安全的重视也将加快市场集中度提升，我们认为储能各环节中具备先进技术和制造能力的龙头企业将受益。

工业自动化1Q21 代表性行业高景气，机床产业链需求旺盛。工程机械行业需求稳定，基本面无虞。多地颁布氢能产业发展规划，氢能商用化有望提速。我们建议关注“顺周期、国产替代、碳中和”三条投资主线，从中优选具备护城河和长期增长潜力的制造龙头。维持覆盖公司的盈利预测、目标价和评级不变。

机械行业表现整体优于大盘，但其中子版块分化明显，负面冲击弱化，静待业绩释放。营收规模同比提升，经营质量仍然良好；沿三条主线看好我国制造业的发展潜力，在基建和地产双驱动下，我们预计工程机械板块未来仍将保持较高景气度。

台积电于4 月15 日召开投资者电话会议，对公司2021 年Q1 业绩进行了说明和展望。受强劲芯片需求带动，一季度净利润以美元计算同比增长近20%，营收同比增长16.7%。会议上强调了芯片短缺会从汽车制造领域延续至消费电子产品甚至更广，供应紧张的情况会延续至2022 年底，有望在2023 年得到缓解。预测第二季度营收上限上修至132 亿美元。半导体行业景气度超预期拉长，制造产能紧缺拉动半导体设备需求上升，继续强烈推荐A 股半导体设备板块。

A rectifier is a two-lead semiconductor that enables current to pass in only one direction. It is an electrical component that converts alternating current (AC) to direct current (DC). It is used inside the power supplies of nearly all electronic equipment. Also, in power supplies, the semiconductor rectifier is normally placed in series following the transformer, a smoothing filter, and possibly a voltage regulator. It is typically used as a polarity guard for electronic circuits, which eliminates the hazards of an accidental reversal of supply voltage.

Frequency converters are used to change the frequency of various applications such as motors, pumps, fans, compressors, and others in the industrial sector to increase the speed of the manufacturing process and decrease the overall consumption of electricity. These are also called AC drives or VFDs (variable frequency drives). Global trends such as urbanization, growth in industrial automation, energy efficiency, and increased penetration of renewable energy are expected to support the growth of frequency converters.

Medium voltage (MV) is a range of electricity distribution system voltages from 3.3kV to 33kV. Cable accessories for medium voltage have similar design and performance requirements as that of cables of same voltage range. The scope of the report discusses the potential opportunities for the key players to enter the global medium voltage cable accessories market. Furthermore, it provides an in-depth analysis of the market, outlining current trends, key driving factors, and key areas of investment. The report includes Porter’s five forces analysis to understand the competitive scenario of the industry and role of each stakeholder in the value chain. Moreover, it features the strategies adopted by key market players to maintain their foothold in the market.

A speaker amplifier is an electronic device, which is used to increase the amplifier-sound from low power electronic audio signal to high level audio signal for loudspeakers or headphones. It is used in sound systems such as home audio systems, musical instruments systems, loudspeakers, and sound reinforcement. The purpose of an amplifier is to increase vibrations to the maximum extent of signals without affecting the frequency or any wavelength, and help improve the efficiency of the system. Audio amplifier is also used in wireless communication and broadcasting.

Vending machine is an automated machine that provides items such as foods, beverages, cigarettes, and others. These machines are mostly used in retail sites, public transport hubs, airport, and other public places that provide fast foods. Vending machines are product-oriented machines, which offer different types of products. The base year of the global vending machine market is 2019 while 2020 is the estimated year, wherein the forecast period is 2021-2027.