厂家生产供应教学用手摇交直流发电机

材质：-

品牌：华声

型号：j2417

J2417手摇交直流发电机主要供中学物理和小学自然演示交直流发电机的结构和工作原理使用，此外还可作小功率电源使用。

一、用途

J2417型手摇交直流发电机，主要供中学物理和小学自然演示交直流发电机的结构和工作原理使用，此外还可作小功率电源使用。

二、结构

本机主要由定子、转子、电刷、转动机构、集流环（或换向器）、小灯座、底板等部分组成。

1、底板 2、转子 3、定子（极靴） 4、永磁铁

5、传动带 6、手轮 7、轮座 8、小灯座

9、电刷支架10、电刷11、轴承座 12、集流环(换向器)

三、工作原理

本机是永磁旋转电枢式发电机。当电枢线圈在永磁场中旋转时，线圈切割磁力线产生感生电动势。由于线圈切割磁力线的方向是周期性改变，其产生感生电动势的方向，大小也跟着作周期性变化，即产生出交流电。

电枢线圈发出的交流电，通过集流环（换向器）电刷输出，外电路就得到交流电，通过换向器（半环部分）电刷输出，外电路就得到直流电。

四、主要技术指标

1、输出空载电压：转子转速为1200-1600转/分时，交直流空载电压≥8V。

2、输出负载电压：转子转速为1200-1600转/分时，串入4.8V、0.3A小灯泡，负载电压≥5V。

3、本器两个电刷放在换向器两边时，输出为交流电，放在换向器中间时输出为直流电。

4、转子与极靴的距离≤1.5mm，无碰撞和摩擦。

5、整机使用性能：手摇2分钟，皮带不打滑，不松脱；电刷不变形、不移位、发电正常。

五、操作使用

1、使用前调整电刷与集流环（换方器），使之接触良好。试转时，灯泡发光，说明发电正常，即可根据需要进行实验。

2、交流发电机：电路见图2

图2

先把电刷放在换向器两端，再用滑动变阻器和演示用大型电表，接图2接好线路，慢慢转动电枢，电流计就不断向两个方向指示，显示出交流电。

3、直流发电机：两电刷放在整流子中间时，外电路不变，转动电枢，电流计指针只向一个方向指示，显示出直流电。

六、维护保养和故障排除

1、电刷与换向器应保持清洁和接触良好，电刷压在换向器上要松紧适度。

2、转子与极靴之间间隙很小，使用时要检查是否有卡塞现象，如有卡塞，可调节支架位置，轴承处适当滴加润滑油，以减少摩擦和降低噪音。

3、永磁铁极性应异极放置，否则发不了电。

4、所有线路应连接良好。

七、注意事项

1、本仪器为教学演示用，只能手摇，不允许用其它动力拖动。

2、实验完毕，应卸下皮带，防止弹性衰退。

3、仪器不用时，应存放在干燥通风处，避免受潮。

Ⅰ.Purpose

The J2417 model hand AC and DC generator mainly provides the demonstration of the construction and operation principle of an AC and DC generator for teaching the physics for junior middle schools and the natural science for primary schools. It is also used as a small power supply.

Ⅱ.Construction

The generator mainly consists of a stator, a rotor, brushes, a turning mechanism, a collect ring (or a communtator), a small bulb holder and a base plate.

Fig.1. the composition of the generator

Ⅲ.Operation principle

The generator is a permanent—magnet rotating armature generator. When the armature coil rotates in the permanent magnet field, the induced electromotive force will be generated by the coil cutting the mage tic line of force.

Because the direction of the cutting is a periodic change, the direction and amount of generated induced electromotive force varies as the periodic change, generating an alternating current.

The alternating current by the armature coil is received in the external circuit through the brush output in the collector ring (commentator); and the direct current through the brush output in the commutator (half ring part).

Ⅳ.Specifications

(1)Output idle voltage: AC and DC idle voltage≥8V at 1200-1600 rpm rotating speed of rotor.

(2)Output load voltage: Load voltage≥5V at 1200-1600 rpm rotating speed of rotor and connecting 4.8V, 0.3A small bulb.

(3)When the two brushes of the generator are put in the two ends of the commutator, the output is an alternating current. When they are put in the middle of the commutator, the output is a direct current.

(4)Distance between rotor and pole piece≤1.5mm, without collision and friction

(5)Operation performance: At turning the handwheel for two minutes, no slide and loose belt; no deformation and shift brush; normal generation.

Ⅴ.Operation

(1)Adjust the brush and the collector ring (commutator) before the operation and keep good contact. When turning the handwheel, the bulb will come on, indicating normal generation. Then an experiment will be done when desired.

(2)

Fig. 2

AC generator: Its circuit is shown in Fig. 2. Place the brushes at the two ends of the commutator, and then connect a slide rheostat with a large electric meter for demonstration as shown in Fig. 2. Turn the armature slowly, and the current meter will have two direction indications continuously, indicating an alternating current.

(3)DC generator: When place the two brushes in the middle of the commutator, keep the external circuit constant and turn the armature, and then the needle of the current meter only will have one direction indication, indicating a direct current.

Ⅵ.Maintenance and trouble shooting

(1)The brushes and the commutator should keep cleanness and good contact. The pressure of the brushes on the commutator should keep suitable degree of tightness.

(2)Because of a very small gap between the rotor and the pole piece, you should inspect the block condition when in use. If the block exists, you can adjust the support position. Properly add Lubrication oil at the bearing to reduce friction and noise.

(3)The polarity of permanent magnet should be put in the heteropolar position, or the current will not be generated.

(4)All lines should be connected properly.

Ⅶ.Points to watch

(1)The generator is for teaching demonstration. It is used only by hand and is not permitted with other power drive.

(2)After the experiment, the belt should be removed to avoid elastic fade.

(3)When not in use, the generator should be kept in the dry and ventilation place to avoid moisture.