What does electromagnetic phase shift mean, what does phase shift mean?

Electromagnetic phase-shifting motor.

Its principle is very simple, so that the motor rotor impedance phase shift 45 degrees, so that the motor impedance is close to pure resistance, with ideal motor characteristics, no starting Xun consumption, constant torque, any speed can work stably for a long time, the cost is very low, enough to replace the traditional asynchronous motor.

The following introduces its principle, taking the two-pole motor as an example.

At this point, the rotor cuts the magnetic field lines and generates current in and out.

x n out axis into s

y 3 half-wave phase-shifting circuit, plus two diodes half-wave rectification scheme as follows:

Out of x, in y

In this case, since XY does not cut the magnetic field lines and does not induce current, the magnetic field of the rotor will move forward by 45 degrees, and its external rotor impedance will also move forward by 45 degrees.

4 Full-wave rectifier quadrude circuit:

Out x in y out.

The rotor moves relative to the stator slip, and the mechanism of the phase shift of the magnetic field of the rotor circuit by 45 degrees after rectification is analyzed and studied by yourself.

2. Electromagnetic phase-shifting synchronous motor technology.

This technology is more complex, the rotor does not use external input current and starting equipment, the constant torque tolerance is self-simulating, the production process is very simple, and its cost is very low and comparable to the asynchronous motor.

3. Transformer magnetic circuit phase shifting technology.

This technology is more complex but very low-cost, regardless of the size of the giant micro transformer can be designed to low inductance pure resistance or high capacitance, if used in the global power transmission system, can reduce the global power transmission system loss by more than 30%, transmission capacity by more than 30%.

Phase shift is the state when the waveform of the AC signal (including alternating current) does not change according to the original angle when it changes, and the angle changes, if it should be 90°, but the amplitude becomes 120°, it is the phase shift of 30°, and it should be the forward shift of 30°, which is the voltage change on the inductance. In the rectifier circuit, it is generally a capacitor, and the capacitance phase shift refers to the AC signal moving backward after passing through the capacitor in parallel, which means that the voltage is shifted backward, and the voltage after the capacitor cannot be jumped.

The air-gap magnetic field is a rotating magnetic field. There are two windings on the stator of the single-phase motor, one is the working winding, the other is the starting winding, the two windings are 90 ° apart in space, and the stator magnetic potential is the pulsating magnetic potential, which produces two positive and negative magnetic fields, and the resultant electromagnetic torque is zero, and the motor cannot start by itself. In order for a single-phase asynchronous motor to generate a starting torque, it is necessary to find a way to generate a rotational magnetic potential inside the motor when starting.

There are two commonly used methods: split-phase starting and shaded pole starting, and split-phase starting is a capacitive starting motor.

The electromagnetic law of single-phase AC motor and three-phase AC motor is the same, but the working principle is different, the condition of motor rotation is: the rotor conductor current energy and the air gap magnetic field interact so that the rotor conductor can be affected by the electromagnetic force, under the action of the electromagnetic force, the rotor of the motor can rotate, and its steering is the same as the rotation direction of the air gap magnetic field. The windings of the three-phase AC motor are 120° apart in space, 120° in the phase of the three-phase magnetic potential and electric potential, and the air gap magnetic field is a rotating magnetic field.

There are two windings on the stator of the single-phase motor, one is the working winding, the other is the starting winding, the two windings are 90 ° apart in space, and the stator magnetic potential is the pulsating magnetic potential, which produces two positive and negative magnetic fields, and the resultant electromagnetic torque is zero, and the motor cannot start by itself. In order for a single-phase asynchronous motor to generate a starting torque, it is necessary to find a way to generate a rotational magnetic potential inside the motor when starting. There are two commonly used methods: split-phase starting and shaded pole starting, and split-phase starting is a capacitive starting motor.

In order to obtain a circular rotating magnetic field, the amplitude of the pulsating magnetic potential of the starting winding and the amplitude of the pulsating magnetic potential of the working winding are required to be equal, but the difference between the two is 90° in the time phase of the pulse. For this purpose, it is required that the current in the starting winding and the current in the working winding differ by 90° in time phase. This requirement is usually met by connecting capacitors in series on the starting winding.

At this time, the current in the starting winding is one electrical angle ahead of the single-phase voltage, and the current in the working winding is one electrical angle ahead of the single-phase voltage. When the capacitor is properly configured, a circular rotating magnetic field can be generated in the motor air gap to enable the motor to start smoothly.

In physics, analog circuits have their own frequency characteristics, and after a sine wave of different frequencies passes through the circuit, the waveform will differ from the input signal in time. The phase difference between the output sine wave and the input sine wave signal is called phase shift.

Analog circuits refer to circuits used to transmit, convert, process, amplify, measure, and display analog signals. An analog signal is an electrical signal that changes continuously.

Analog circuits are the basis of electronic circuits, which mainly include amplification circuits, signal operation and processing circuits, oscillation circuits, modulation and demodulation circuits, and power supplies.

Analog circuits have their own frequency characteristics, and after a sine wave of different frequencies passes through the circuit, the waveform will differ from the input signal in time. The phase difference between the output sine wave and the input sine wave signal is called phase shift.

Phase Shifter Phase Shifter

A device that adjusts the phase of a wave.

Fluctuations conducted by any pair of transmission mediums in them introduce phase shifts, which is the principle of early analog phase shifters; After the development of modern electronic technology, digital phase shift has been realized by using a d and d a conversion, as the name suggests, it is a discontinuous phase shift technology, but it is characterized by high phase shift accuracy.

Phase shifters have a wide range of applications in radar, missile attitude control, accelerators, communications, instrumentation and even other fields.

In an R-C series circuit, if the input voltage is a sine wave, the voltage and current everywhere in the circuit are sine waves. As can be seen from the phasor diagram, the output voltage phase leads to the input voltage phase by an angle, if the input voltage does not change, then when the power supply frequency f or the circuit parameter R or C is changed, the angle will change, and the trajectory of point A is a semicircle. In the same way, it can be analyzed that when the capacitor voltage is used as the output voltage, the output voltage phase lags behind the input voltage phase by one angle.

Therefore, regardless of whether the R terminal or the C terminal is used as the output, the output voltage has a phase-shifting effect compared with the input voltage, and this effect is called resistance-capacitance phase shifting.

The resistance-capacitance phase-shifting link is widely used in electronic technology applications, such as phase-shifting circuits, coupling circuits, differential circuits, integration circuits, etc.

Magnetism refers to the properties that attract substances such as iron, cobalt, nickel, etc.

The interaction between magnetic poles refers to the repulsion of the same poles and the attraction of different poles.

There are types of magnetism.

Diamagnetism: When the magnetization m is negative, the solid behaves as diamagnetic. Metals such as BI, CU, AG, AU, etc., have this property.

In the external magnetic field, the magnetic induction intensity inside this magnetized medium is less than the magnetic induction intensity m in the vacuum. The magnetic moment of the atoms (ions) of a diamagnetic substance should be zero, i.e., there is no permanent magnetic moment. When a diamagnetic substance is placed in an external magnetic field, the external magnetic field causes the electron orbit to change, inducing a magnetic moment that is opposite to the direction of the external magnetic field, which is diamagnetic.

Paramagnetic: The main characteristic of paramagnetic substances is that there is a permanent magnetic moment inside the atom, regardless of the presence or absence of an applied magnetic field. However, in the absence of an applied magnetic field, due to the irregular thermal vibration of the atoms of the paramagnetic substance, the macro ** comes, and there is no magnetism; Under the action of the applied magnetic field, the magnetic moment of each atom is relatively regularly oriented, and the substance shows extremely weak magnetism.

The magnetization is consistent with the direction of the external magnetic field, is positive, and is strictly proportional to the external magnetic field h.

Ferromagnetism: For substances such as Fe, Co, Ni, etc., the magnetic susceptibility can reach 10-3 orders of magnitude at room temperature, and the magnetism of such substances is called ferromagnetism. Ferromagnetic substances can obtain extremely high magnetization even in weak magnetic fields, and when the external magnetic field is removed, they can still retain extremely strong magnetism.

Its magnetic susceptibility is positive, but when the external field increases, its h becomes smaller due to the rapid saturation of magnetization.

Antiferromagnetism: Antiferromagnetism refers to the reverse parallel alignment due to the spins of electrons. There is spontaneous magnetization in the same sub-lattice, and the electron magnetic moments are arranged in the same direction; In different sub-lattices, the electron magnetic moments are reversed.

The spontaneous magnetization in the two sub-lattices is of the same magnitude and opposite in direction, and the whole crystal is .

There are also ferromagnetism, spin glass, and mixed magnetism, superparamagnetism.