permanent magnet

简明释义

水磁铁永磁永久磁铁

英英释义

例句

1.The speaker uses a permanent magnet to create sound waves.

扬声器使用永磁体来产生声波。

2.Refrigerators often have permanent magnets in their doors to keep them closed.

冰箱的门上通常有永磁体以保持其关闭。

3.A permanent magnet can be used to hold tools in place on a workbench.

永磁体可以用来将工具固定在工作台上。

4.Many toys use permanent magnets to stick pieces together.

许多玩具使用永磁体将部件粘在一起。

5.In electric motors, a permanent magnet can help improve efficiency.

在电动机中，永磁体可以帮助提高效率。

作文

A permanent magnet is a type of magnet that maintains its magnetic properties without the need for an external power source. Unlike temporary magnets, which only exhibit magnetism when exposed to a magnetic field, permanent magnets are made from materials that can be magnetized and retain their magnetic state over time. This unique property makes them essential in various applications, ranging from household items to industrial machinery.One of the most common uses of permanent magnets is in refrigerator magnets. These small, colorful pieces of magnetized material stick to the metal surface of a refrigerator door, allowing people to display photos, reminders, or shopping lists. The simplicity and effectiveness of these magnets showcase how permanent magnets have become a staple in everyday life.In addition to household applications, permanent magnets play a crucial role in technology and industry. For instance, they are used in electric motors, where they help convert electrical energy into mechanical energy. The interaction between the magnetic fields of permanent magnets and electromagnets produces motion, which is fundamental to the operation of various devices, including fans, pumps, and even electric vehicles.Another significant application of permanent magnets is in magnetic resonance imaging (MRI) machines. These medical devices utilize strong permanent magnets to create detailed images of the inside of the human body. The ability of permanent magnets to generate a stable and powerful magnetic field is vital for the accurate diagnosis of various health conditions.The manufacturing process of permanent magnets involves several steps, including the selection of appropriate materials, such as neodymium, samarium-cobalt, or ferrite. Each material has its own set of properties, making it suitable for different applications. For example, neodymium magnets are known for their exceptional strength and are often used in high-performance applications, while ferrite magnets are more cost-effective and commonly found in consumer products.Despite their advantages, permanent magnets also have limitations. One of the main drawbacks is that they can lose their magnetism if exposed to extreme temperatures or physical shock. Therefore, understanding the environment in which a permanent magnet will be used is crucial for ensuring its longevity and effectiveness.In conclusion, permanent magnets are indispensable components in our daily lives and various industries. Their ability to maintain a stable magnetic field without the need for external energy makes them unique and valuable. As technology continues to advance, the applications of permanent magnets are likely to expand, leading to new innovations and improvements in efficiency across numerous fields. Understanding the properties and uses of permanent magnets not only enhances our knowledge of physics but also highlights their significance in modern society.

永磁体是一种无需外部电源即可保持其磁性特性的磁铁。与临时磁铁不同，后者仅在暴露于磁场时表现出磁性，永磁体由可被磁化并能够长时间保持其磁状态的材料制成。这一独特特性使其在从家庭用品到工业机械的各种应用中至关重要。永磁体最常见的用途之一是冰箱磁铁。这些小巧多彩的磁性材料可以粘附在冰箱门的金属表面，使人们能够展示照片、提醒或购物清单。这些磁铁的简单性和有效性展示了永磁体如何成为日常生活中的一种基本元素。除了家庭应用，永磁体在技术和工业中也发挥着至关重要的作用。例如，它们被用于电动机中，帮助将电能转化为机械能。永磁体与电磁体的磁场之间的相互作用产生运动，这是各种设备（包括风扇、水泵甚至电动车）运作的基础。永磁体的另一个重要应用是在磁共振成像（MRI）机器中。这些医疗设备利用强大的永磁体产生人体内部的详细图像。永磁体生成稳定且强大的磁场的能力对于准确诊断各种健康状况至关重要。永磁体的制造过程涉及多个步骤，包括选择合适的材料，如钕、钐钴或铁氧体。每种材料都有其自身的一组特性，使其适用于不同的应用。例如，钕磁铁以其卓越的强度而闻名，通常用于高性能应用，而铁氧体磁铁则更具成本效益，通常出现在消费产品中。尽管有其优点，永磁体也存在局限性。主要缺点之一是如果暴露于极端温度或物理冲击下，它们可能会失去磁性。因此，了解永磁体使用环境对于确保其耐久性和有效性至关重要。总之，永磁体是我们日常生活和各个行业中不可或缺的组成部分。它们无需外部能源即可保持稳定的磁场的能力使其独特且有价值。随着技术的不断进步，永磁体的应用很可能会扩展，从而在众多领域带来新的创新和效率提升。理解永磁体的特性和用途不仅增强了我们对物理学的认识，也突显了它们在现代社会中的重要性。