SU488169A1 - Device for automatically recording static hysteresis loops of magnetic cores - Google Patents

Description

Control device snnh: lowers the work of the printing npncTaiSKii 6 with weights. In the current state of operation, counters 1 and 2 are set to “O”, which corresponds to the maximum magnitude of the magnetic flux and the maximum value of the current and response.

The former 11 generates imulses, the duration of which is proportional to the duration of the pulses of the emf, induced on the secondary winding of the core by the action of a magnetized current. With a small amplitude of pulses of emf. a pulse of maximum duration is formed, equal to the duration of the sync pulse, the prefix for it. Such a duration ensures the switching of the core according to the static hysteresis.

As the magnetizing field increases, the switching time of the core decreases and the amplitude of the emf pulses increases. Upon reaching the amplitude of the emf pulses the trigger threshold of the duration of the pulse at the output of the latter, a pulse is formed, the duration of which is 2-3 times the duration of the pulse emf. A margin of duration is required for reliable switching of the core along a complete static hysteresis loop.

The impulse of the magnetizing current at the output of the key 12 has a duration equal to the duration of the pulse from the imaging device 11, and the amplitude proportional to the voltage at the output of the encoding iriver 4. A readout of the amplitude and duration is formed at the trailing edge of the magnetization pulse. The read signals are sent to the integrator via the coding converter 3, which converts the counter code in the integrator C-circuit magnitude, proportional to the magnetic flux F, and the signal at the integrator input is equal to

and - -.

The signal from the integrator is analyzed by the discriminator 10 and is fed to the control device. To increase the noise immunity of the device, the signal is sampled from the discriminator using a gate driver. As long as the signal from the integrator is increased by the magnitude of the amplitude discriminator, a "" sign is printed, followed by an increase in the counter code 1. This leads to an increase in the C-circuit and a corresponding increase in the outputs of the integrator. In the absence of a signal from the discriminator, the sign "O" is printed and the carriage of the printing attachment is returned, the counter code 2 and the magnitude of the magnetizing pulse increase by one. Counter 1 is reset; device operation continues in a similar fashion. When the counter overflows 2 device

and stops working.

Claims (1)

Invention Formula A device for automatically registering static hysteresis loops of magnetic cores, comprising a control device connected to the respective coding transducers via two counters and with the printing device directly, as well as sequentially connected read pulse shaper and measuring table, the output of which is connected to the second input of the second coding converter, and the output of the latter through the integrator is connected to the amplitude discriminator, in order to reduce power consumption and increase accuracy measurements, it is equipped with a strobe former, a pulse duration former and a key of magnetization pulses, one input of which is connected to the inputs f gate stator, read pulse generator and pulse width driver output, another input - with the output of the first coding converter, and output - with an input of the measuring table and output of the read pulse generator, and the strobe is connected to another input of the amplitude discriminator, the input of the pulse width generator is connected to the integrator input and the output of the second coding transducer.