Manufacturing and testing of cell phone jammer

Closed-loop control mode of slip frequency control of the slip compensation can be achieved DC double closed loop water slip frequency control slip compensation closed-loop control mode, level (3) Vector Control Vector Control: vector control based on the size of the control of the motor dynamic model, both to control the amount of control of the motor dynamic model, both to control the amount of size, the controlling party places a high dynamic performance requirements of high dynamic performance. occasions. The good cell phone jammer company can effectively guarantee the product quality.4 diagrams two PWM technology devices used by the main circuit 5, the use of voltage, high-voltage inverter high-voltage inverter (2-10KV) low voltage inverter (380V 660V) low voltage inverter sinusoidal pulse width modulation technology 1, definition: the use of semiconductor devices on and off the DC voltage into a certain shape, definition: the use of semiconductor devices on and off, the voltage pulse sequence, in order to achieve frequency conversion, transformer and control and the elimination of harmonic , the target of a voltage pulse sequence to the inverter, transformer and control and eliminate harmonics for a technical target. 2, the mathematical analysis: (i) pulse waveform nine f (t) is an odd function by nature of the Fourier series: f (t) = f (t), a0 = a0, = 0 is an odd function, by the nature of the Fourier series is an odd function of the range of 1, set f (t) The range of, the range of m pulses square wave of half-wave cut, cut angle 1α 2 KK, α m for the cut in the square wave of half-wave pulses, pulse α for odd n and odd odd and odd m: odd number (3)The high-precision imported equipments and instruments are applied for the manufacturing and testing ofcell phone jammer. For odd n and even for odd and even m: and even (4) Thus, by (3) and (4) for odd and arbitrary have and any of m are so, where for odd n and arbitrary for odd functions, even harmonics zero, only odd harmonics, odd function, even harmonics to zero, only odd harmonics, namely Discussion: PWM technique to control the inverter output waveform, harmonic technique to control the inverter output waveform to discuss: (1) the use of technology to control the inverter output waveform content decreased content decreased. ( 2) harmonic to reduce is to reduce the expense of the fundamental amplitude of the harmonic reduction is to reduce the expense of the fundamental amplitude for harmonic reduction is to reduce the fundamental amplitude for the price, SPWM, (1) natural sampling (2) The rules of natural sampling sampling regulations, sampling method diagram (ten)The good mobile phone jammer company has the complete testing equipment of good quality.  Thirteen variable phase SPWM inverter output waveform, the induction motor speed control strategy for inverter-controlled object is the motor, inverter control motor First the motor equivalent diagram (a) diagram is equivalent to an equivalent diagram equivalent to Figure: 1, the rotor potential: the frequency of the rotor potential is 2, the rotor rotation, the rotor conductor and magnetic rotor potential frequency of the rotor potential for f The rotor field relative velocity decreases, the frequency of the rotor EMF is also reduced, then the relative velocity between the field decreases, the frequency of the rotor EMF is also reduced at this time : f2, the = f1S the rotor does not move, the potential of a phase of the rotor does not move when the electric potential of a phase as follows: E2 = 4.44f1w2Φ kw2 type: The production process of cell phone jammer strictly conforms to the Quality System Standard.W2 - rotor phase winding rotor turns one phase winding turns KW2 - rotor winding coefficient of the rotor winding coefficient (2) (a) rotor rotating one phase electric potential as: rotor one phase electric potential 2, the rotor electrical potential balance equation:, rotor potential balance equation when the rotor without external resistors.