The principle of swinging fountain with music
A fountain is a combination of water or other liquid sprayed by a certain pressure through a nozzle with a specific shape. Nowadays, fountains are generally artificial landscape fountains relying on fountain equipment. It is mainly through the control of frequency converter to achieve rhythm and rhythm. The music fountain is rich in water shape changes, and the combination of light gives people a real and intuitive aesthetic feeling. All kinds of swing in the music fountain can make people feel the soft beauty of the fountain. The radial swing is caused by the swing mechanism under the water surface, which makes the waterscape beautiful and moving, pleasing to the eyes, and gives people a magical feeling. It is the performance of the high-tech development of the times.
The change of the position and velocity of the swing fountain is an important factor to produce the natural and unrestrained wind color of the swing water type. The position sensor of fountain swing mechanism shall be waterproof and non-contact positioning device. Hall sensor induced by magnet, photoelectric sensor guided by optical fiber or rotary position encoder attracted by magnet are often used. For example, the positioning device of the fountain swing mechanism with position encoder includes position encoder, high-speed counter, control computer and communication interface installed on the swing motor shaft. Since the linkage of the swing mechanism usually has a large gap, in order to achieve the positioning, the swing mechanism can only reach the positioning point from one direction, so as to make it repeat the accuracy. Therefore, when the swing mechanism needs to stop, it needs to reach the positioning point from one direction every time.
The positioning accuracy of the swing mechanism is affected by the motion moment and resistance moment. The moment of motion is determined by the supply voltage of the motor and the speed of motion before the motor stops, while the moment of resistance is composed of the friction force of the swing mechanism, the speed of water flow and the wind force around. It can be seen that these are factors that cannot be determined in advance. Therefore, in order to achieve the goal of positioning, we need to change its control parameters every time. Generally, there are two control parameters for motor energy consumption braking positioning: the magnitude of DC braking current and starting braking time. The more convenient way for computer control is to change the braking time.
In the control system, the motor braking time can be corrected by detecting the deviation of the position point. According to the statistical data of the positioning deviation value of the swing mechanism and the calculation of the mathematical model, the braking time is determined.