"The Principle of Electric Motor Rotation" Electric Motors and Generators PPT Courseware 3

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"The Principle of Electric Motor Rotation" Electric Motors and Generators PPT Courseware 3

1. Learning objectives:

1. Understand that the current-carrying wire will be affected by force in the magnetic field, and know that the direction of the force is related to the direction of the current and the magnetic field.

2. Know that the force exerted on a current-carrying conductor in a magnetic field is related to the strength of the current and the strength of the magnetic field.

3. Apply the knowledge you have learned to analyze the working principle of the motor, and be able to use the force of the magnetic field on the current to solve certain practical problems.

4. Know what a commutator is and its function. Know the energy conversion of electric motors

2. Independent learning:

1. A current-carrying conductor is acted upon by ____________ in a magnetic field, and the direction of the force is related to both ______ and ______.

2. The coil swings back and forth a few times and then stops. This position of the coil is called: _________.

3. There is a "small mechanism" at the entrance of the motor power supply - _________, which is composed of two _________ that are insulated from each other. The two semicircular rings of the commutator are connected to ________ respectively, and are connected to the two poles of the power supply through ____.

4. When the coil crosses the equilibrium position, due to the action of _____, the _______ in the coil is changed, causing the coil to continue to rotate.

3. Testing and feedback:

1. An energized coil can __________ in a magnetic field. When the plane of the coil is perpendicular to the magnetic field lines, the magnetic field force exerted on the coil acts as a pair of __________ forces.

2. The DC motor is made based on the principle that the energized coil is in the _________ device. It uses the _________ device to automatically change the direction of the current in the coil, so that the coil continuously rotates.

3. The DC motor is composed of ＿＿＿＿＿＿＿＿＿＿＿＿＿＿ and other parts.

4. Which of the following electrical appliances is not used in electric motors [ ]

A. Electromagnetic relay B. Washing machine C. Moving coil speaker D. Electric fan

4. Improvement after class:

1. In the experiment of installing a DC motor model, Xiaojie installed a DC motor model as shown in Figure 2 according to the requirements of the science textbook. After the installation is completed, after closing the switch, the coil rotates clockwise. The method to make the coil rotate counterclockwise is: [ ]

A. Reduce one battery

B． Reverse the poles of the power supply and the magnet at the same time

C. Add a battery

D． Reverse the poles of the power supply

2. In the above question, if the motor model rotates too slowly, which of the following methods is feasible to increase the speed [ ]

A. Enhance the magnetic properties of the magnet B. Increase the power supply voltage

C. Increase the number of coil turns D. Add lubricating oil between the brush and commutator

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For more information about the "Principles of Motor Rotation of Electric Motors and Generators" PPT courseware, please click the "Principles of Electric Motors and Generators PPT Rotation of Electric Motors" ppt tag.

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Update Time: 2024-10-02

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 2 industry PPT template

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