Frequency detection circuit and method for quickly calculating electrical parameters of motor

Abstract

The invention relates to a frequency detection circuit and method for rapidly calculating electrical parameters of a motor, and the frequency detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, and a comparator U1. A pin 7 of the comparator U1 is connected with a 5V power supply, and a pin 4 of the comparator U1 is grounded; a pin 3 of the comparator U1 is connected with a resistor R3, and the other end of the resistor R3 is connected with an output signal of the motor; a second pin of the comparator U1 is connected with one end of a resistor R1, one end of a resistor R2 and one end of a capacitor C2, the other end of the capacitor C2 and the other end of the resistor R1 are grounded, and the other end of the resistor R2 is connected with a 5V power supply. A pin 8 of the comparator U1 is grounded, the pin 8 is also connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with a 5V power supply; a pin 6 of the comparator U1 is used as output; by setting the data groups, the effective data corresponding to the output signal can be output after the sampling of at least one data group without waiting for the completion of periodic sampling and then calculating the effective data corresponding to the output signal, so that the waiting time is shortened.

Description

technical field [0001] The invention relates to the field of motors, in particular to a frequency detection circuit and a method for quickly calculating electrical parameters of a 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 the necessary parameters to measure the performance of the motor and calculate the efficiency of the motor. Especially when performing a high-power test or a locked-rotor test on 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 effective value of the voltage of the motor (U RMS ), current effective value (I RMS ) and active power (P) are calculated based on the sampling data in the cycle, usually need to sample multiple cycles, and obtain it according to the electrical param...

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

Images