Home-made Electric Motor Course Presentation

  The construction of a direct current motor is divided into two parts: the stator and the rotor. Note: Do not confuse the commutator with the commutator pole. Remember their roles. The stator includes: main magnetic poles, base, commutator poles, brush device, etc. The rotor includes: armature core, armature winding, commutator, shaft, and fan, etc. 2. The excitation method of a direct current motor is closely related to its performance. There are four types of excitation methods for direct current motors: direct current helix motor, direct current parallel motor, direct current series motor, and direct current compound motor. Master the characteristics of each method: a direct current helix motor has no electrical connection between the excitation winding and the armature, and the excitation circuit is supplied by another direct current power supply. Therefore, the excitation current is not affected by the armature terminal voltage or armature current. A direct current parallel motorThe voltage at both ends of the field winding is the same as the voltage at both ends of the armature, but the field winding is wound with thin wires, which has a large number of turns, resulting in a larger resistance, thus causing a smaller current through it. In a direct current series excitation motor, the field winding is in series with the armature, so the internal magnetic field of this motor significantly changes with the change of the armature current. In order to prevent large losses and voltage drops in the field winding, the smaller the resistance of the field winding is, the better, so direct current series excitation motors are usually wound with thicker wires, with fewer turns. In a direct current compound excitation motor, the magnetic flux is generated by the excitation currents in both windings.

Objective of the experiment: 1. Understanding the structure of an electric motor - An electric motor is a rotating electromagnetic machine that operates based on the principle of electromagnetic induction. It is used to convert electrical energy into mechanical energy. When operating, it absorbs electrical power from the electrical system and outputs mechanical power to the mechanical system.

Experimental Cognition
Battery box: As the name suggests, it is a box used to install and fix the batteries, which is the device for outputting battery power.

Circuit: When the rotor winding is powered, an induced electric potential and current are generated. The induced current in the magnetic field will be subject to a force. The direction of the rotor current's force is the same as the direction of the rotating magnetic field. The magnetic flux through the air gap and the rotor current produce
The torque generated is what is known as the electromagnetic torque of an electric motor. When the electric motor rotor is dragged by the electromagnetic torque, it starts to rotate in the direction of the rotating magnetic field.

Magnet: Magnets are not invented by humans; they are natural magnetite. The ancient Greeks and the Chinese discovered that there is a natural magnetized stone in nature, which they called 'lodestone.' This stone can magically attract small pieces.
The earliest known use of magnets dates back to ancient China, where they were used to guide navigation at sea. Early mariners relied on these magnetic iron plates, which, after being freely swung, always pointed in the same direction. This early form of the compass was one of the most significant inventions in the history of navigation.
The Chinese people, also known as the "compass," is one of the four great inventions of China.

Experimental steps:
1. Experiment preparation: Understand the experimental equipment: wire, rotor, battery box, base board, support, and diagonal pliers.

Experiment Report:
The motor uses the properties of electromagnetic force to rotate the stator, and students can make their own motors to understand the basic principles of the motor.

Company Profile

 Chiluo Toy Factory was established in 2007. After ten years of unremitting efforts, our company has gradually matured; Our company is a member of the National Ministry of Education Teaching Equipment Industry Association and a backbone enterprise of Zhejiang Province Teaching Equipment. The company has been awarded the "Heavy Contract and Credit-Keeping" unit for three consecutive years by Yiwu City. In 2014, it was designated by the Zhejiang Provincial Education Bureau as the "Culture and Popularization Experiment Equipment Fixed-point Production Unit."

AiGou Company is a high-tech enterprise that integrates modern scientific research and development, educational equipment, curriculum design, teaching resource integration, and technical services. AiGou, with its high-tech products, is a professional enterprise in the development and production of popular science experiment teaching materials in the country. The products are exported to Europe and the United States.
 After years of accumulation, the company has initially reached a certain scale. In terms of technological innovation, the company has professional design personnel engaged in the development of scientific education products and the upgrade and replacement of existing products. In terms of production, management, and service, the company strictly implements the standards of the ISO9001 international quality assurance system. In marketing, the AiGou products have been entered into many provinces and cities in the country and enjoy a good reputation. For many years, it has provided high-quality, advanced, professional series of modern teaching equipment and professional equipment research and development custom services for the educational community. With excellent, high-quality professional talents and perfect after-sales service, it ensures the excellence of product quality and establishes a good corporate image. The scientific education physical series, chemical series, photovoltaic, wind energy, geography, biology, art and other products of Qiquan have successfully won bids in the education bureau tenders many times.

 Chilvog Company continues to adhere to the business philosophy of 'quality first, service to diligence, honesty in conduct', providing excellent equipment and high-quality service for school teaching and research. We are willing to work diligently with new and old friends at home and abroad, join hands to progress, and devote our utmost efforts to education, dedicated to the cause of education.

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