Resonant motion? Wuhan UHV specializes in the production of series resonance, with a wide range of product selection and professional electrical testing. To find series resonance, choose Wuhan UHV.
Resonance is a physical harmonic vibration, in which the acceleration of an object is proportional to the displacement from the equilibrium position and is always directed towards the equilibrium position by the restoring force. The dynamic equation is F=- kx. The phenomenon of resonance is that the current increases and the voltage decreases. The closer it is to the resonance center, the faster the ammeter, voltmeter, and power meter rotate, but the difference from short circuit is that there will be no zero sequence quantity.
In physics, there is a concept called resonance: when the frequency of the driving force is equal to the natural frequency of the system, the amplitude of the forced vibration of the system is maximized, and this phenomenon is called resonance The resonance in a circuit actually means that when the excitation frequency of the circuit is equal to its natural frequency, the amplitude of the electromagnetic oscillation of the circuit will also reach its peak In fact, resonance and resonance express the same phenomenon This phenomenon with the same essence has different names in different fields.
The radio utilizes the resonance phenomenon. When turning the knob of the radio, it is changing the natural frequency of the circuit inside. Suddenly, at a certain point, the frequency of the circuit became equal to the frequency of the electromagnetic waves that were previously invisible in the air, and they resonated. The distant sound came from the radio. This sound is a product of resonance.
A circuit composed of an inductor L and a capacitor C that can resonate at one or several frequencies is collectively referred to as a resonant circuit. In electronic and radio engineering, it is often necessary to select the electrical signals we need from many electrical signals, while suppressing or filtering out the electrical signals we do not need. Therefore, a selection circuit, namely a resonant circuit, is needed. On the other hand, in power engineering, certain hazards may arise due to resonance in the circuit.
The characteristics of resonant circuits during resonance include
1. The resonant impedance Z0 is a pure resistor with the minimum value, that is, Z0=R.
2. The current is in phase with the power supply voltage, that is, φ=ψ u - ψ i=0.
3. When the current reaches its maximum value, i.e. I=I0=US/R0, I0 is called the resonant current.
4. High voltage may occur at both ends of L and C, i.e. UL0=I0XL0=(US/R) XL0=QUS, UC0=I0XC0=(US/R) XC0=QUS
It can be seen that when Q>>1, there is UL0=UCO>>US, so series resonance is also known as voltage resonance. This phenomenon of high voltage is extremely useful in radio and electronic engineering, but it is harmful in power engineering and should be prevented.
Resonant circuits have a characteristic that capacitance is equal to inductance, and the circuit is resistive:
So there is ω L=1/ω C, because LC is a known condition, so the resonant frequency point can be calculated. The quality factor Q=ω L/R. If the quality factor is 28, then the parallel resonant circuit has a current increase of 28 times; If it is a series resonant circuit, then the voltage has increased by 28 times. So now the voltage at the series resonance point is the applied voltage multiplied by the quality factor. If the known conditions tell you that the applied voltage is the peak value, then multiply it directly; If the known conditions tell you that the applied voltage is the effective value, then you need to multiply the calculated voltage by 1.414 to obtain the peak value.
