A sound and light control switch circuit II

Description: The generated alternating current (AC) at both ends of the voltage is adjusted after being rectified to supply the motor armature windings, allowing for speed adjustments of a 15W lamp. It is noteworthy that despite the freewheeling role of the circuit, the motor speed remains very low, resulting in jerky motion. This occurs due to the short conduction time of the triac, which leads to a potential shadow under the ring and places the motor in a critical state of instability. To address this issue, efforts were made to reduce the influence of back electromotive force by connecting a dummy load resistor, which helps maintain proper conduction angles for the silicon-controlled rectifier (SCR). This resistor should be selected to minimize low-frequency oscillations in the motor. A 70W electric resistance was employed to eliminate jitter, although it resulted in power consumption at the armature. The machine operates with a voltage that builds over time, leading to a voltage drop across the resistor of 220V and a power dissipation of 48.4W, which is tolerable. Additionally, the resistor is connected to a rectifier bridge, significantly reducing electric power consumption. For the same 7nW motor, a resistor value of 20kΩ effectively mitigates motor vibrations during operation. This resistor, known as the "ki resistance," consumes 2.4W during high-speed operation. It is important to note that the actual resistance value selected should be slightly higher than the theoretical value. For the aforementioned 70W motor, a 5W 20kΩ resistor is recommended. This speed control circuit is particularly straightforward for applications with less demanding requirements.

The circuit described involves a rectifier bridge that converts AC voltage into a usable DC voltage for the motor armature. The triac plays a crucial role in controlling the power supplied to the motor by adjusting its conduction angle, which directly influences the motor speed. The incorporation of a dummy load resistor is essential to counteract the effects of back electromotive force generated by the motor during operation. This resistance not only stabilizes the circuit but also ensures smooth operation by reducing the jerky motion caused by rapid changes in motor speed.

The selection of resistor values is critical; a higher resistance can help absorb excess voltage and limit current, thus protecting the motor and other components from damage. The use of a 70W electric resistance serves as an effective means to dampen vibrations and improve overall motor performance. The power dissipation across the resistor must be carefully calculated to ensure it remains within safe operating limits, particularly when the voltage across it can reach significant levels.

In applications where speed control is necessary, the described circuit offers a practical solution by allowing for fine-tuning of motor performance while maintaining efficiency. The simplicity of the design makes it suitable for various low-demand scenarios, providing an effective method for managing motor speed and stability.AB generated at both ends of the voltage is adjusted to take after being rectified by supplying the motor armature windings, thereby adjusting 15W Lan achieve speed purposes. I t is worth noting contention two meals pipe bridge despite freewheeling role, Tanzania motor speed is very low when will appear jerky. Because: At this point the triac conduction time when Xu short, the motor should a potential shadow under the ring, and has been turned off in the critical state of instability forgive.

Resolved to do remove drawer trying to reduce the triac cut back electromotive Dan nosebleed influence feeding very Liduan member dummy load resistor connected, also being SCR conduction angle hour work properly. This resistor should be chosen to eliminate the motor amidships low Lian beat prevail. I used the machine to a 70W electric resistance lkn wells connected to eliminate jitter. But in the end Sh armature l l bring resistor power consumption, because the electric machine with voltage l island to build run-time, the voltage across the resistor also children of this building chop 220V, the resistance power of 48.4W.

Husband to the extent r water tolerance. The well is then connected to the resistance of two AC input rectifier bridge (ie FIG q1 of AH two points), the electric power pllwJ H is greatly reduced. The same is 7nW motor, then the value of the resistor connected to the well of 20k0 can effectively eliminate the motor when the beating.

This is called the ki resistance in high-speed operation of the motor lamination) J consumption is 2.4W. Of course, r reducing fat goose, the actual resistance of the power t bite selected to be slightly more husband.

As for 1 above 70W motor selection r 5W20kn resistance. Such speed circuit - less demanding occasions is particularly simple fact in fJ