Three-phase asynchronous motor parameter detection method using a multimeter
First of all, you need to know how to use a multimeter. After understanding how to use a multimeter, you will naturally use a multimeter to measure the parameters you need.
Take my digital multimeter as an example. The multimeter is mainly divided into two parts: the meter body and the test leads. The test leads are very simple, just two test leads, one red test lead and one black test lead; the meter body includes the meter head, which is the screen. , conversion knob, test lead socket.
The top of the watch body is the display screen, which can display all the values we measured;
The buttons below the display screen, the yellow one is the power on/off button, the one above the power button is for AC power conversion, and the light blue one is for lighting up the screen;
The middle part of the multimeter is the conversion knob, which is used to switch various gears. The meanings of the characters above are: AC voltage, DC voltage, Ω gear (resistance) and diode test, frequency, temperature, capacitance, AC/DC/ Microampere, AC/DC/mA, AC/DC/A;
The bottom part of the multimeter body is the test lead socket. There are four sockets in total from left to right, namely current amperes (note the current flow time requirements), current milliamperes and microamps (also pay attention to the current flow time requirements), and COM. It is called the common terminal and voltage resistance diode; the COM hole is plugged into the black test lead, and the remaining three holes are plugged into the red test lead;
In addition, please note that the marking methods on each multimeter are different, but the meanings of the characters are the same. Other keys are rarely used and will not be introduced one by one.
When measuring a motor, it is generally necessary to detect whether there is a short circuit between the phases of the motor terminals, adjust the multimeter to the Ω ohm range, and measure the terminals in pairs with a multimeter to see if the resistance values are not much different. Phase progression indicates that the motor is normal. Likewise, check whether the terminals and the shell are short-circuited. If the resistance is infinite, it is normal. If you want to know the wiring method of the motor, just look at the nameplate on the motor.
