A frequency detection circuit and method for fast calculation of electrical parameters of motor

Abstract

The present invention is a frequency detection circuit and a method for quickly calculating electrical parameters of a motor, wherein a frequency detection circuit includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2 and a comparator U1; 7 of the comparator U1 The pin is connected to the 5V power supply, and the pin 4 is grounded; the pin 3 of the comparator U1 is connected to the resistor R3, and the other end of the resistor R3 is connected to the output signal of the motor; the second pin of the comparator U1 is connected to the resistor R1 and the resistor R2 respectively. And one end of the capacitor C2 is connected, the other end of the capacitor C2 and the resistor R1 is grounded, and the other end of the resistor R2 is connected to the 5V power supply; the 8-pin of the comparator U1 is grounded, and the 8-pin is also connected to one end of the capacitor C1, and the capacitor C1 The other end is connected to the 5V power supply; the 6-pin of the comparator U1 is used as the output; by setting the data group, it is not necessary to wait for the completion of periodic sampling and then calculate the valid data corresponding to the output signal, but after completing the sampling of at least one data group It can output valid data and reduce the waiting time.

Description

technical field [0001] The invention relates to the field of motors, in particular to a frequency detection circuit and a method for rapidly calculating electrical parameters of the motor. Background technique [0002] In the system test of the motor, the electrical parameters such as the voltage, current and power of the motor are necessary parameters to measure the performance of the motor and calculate the efficiency of the motor. Especially in the high-power test or locked-rotor test of the motor, it is also required to obtain the relevant electrical parameters of the motor in a short time, otherwise it will cause irreversible damage to the motor or the driver. In the traditional motor performance test, the rms voltage of the motor (U RMS ), current RMS (I RMS ) and active power (P) are calculated according to the sampling data in the cycle, usually multiple cycles of sampling are required, and they are obtained according to the electrical parameters of each operating ...

AI Technical Summary

Problems solved by technology

However, when the speed of the motor is very low or close to a stall, the frequency F of the input signal is very low, which means that the cycle is relatively large. Using traditional data sampling and calculation methods, it is necessary to collect values ​​​​of multiple cycles, and the waiting time is long. It is not conducive to the rapid test of the motor, and it is easy to damage the motor and other equipment during the test

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