Metodu għal Judging il - Kwalità ta ' Elettriku Muturi bi a Multimetru
Hemm tliet fażijiet muturi u fażi waħda motors, u fażi waħda muturi ukoll għandhom tlieta u sitt wajers.
Three-phase mutur
Sitt viti għal it-tliet fażijiet istralċ of a tliet fażijiet mutur. Let's first remove the connecting piece connecting connecting connecting the motor terminal. Measure the start and end of each phase winding with a multimeter to see if it is on or off. Then use a multimeter to Then use a multimeter to measure the resistance value between each two phase winding separately, at least greater than 0.5 megohms, the greater the better. Fl-aħħarnett, miżura l-insulazzjoni reżistenza bejn kull fażi fażi tkebbib u il mutur casing, li should be infinite. By measuring in this way, the quality of the three-phase motor can be basicly judged.
Three wajer fażi waħda mutur
A unidirezzjonali mutur biss has two windings, one for starting and one for running. One of the three wires is tagħhom common wire, li means that one end of the the two-phase winding is connected together. The other two are the other taps of the two winding of the other taps of the two-phase winding.
The resistance between the two taps should be the massimu u equal to the sum of the resistance values of the two windings.
Of course, we also need to measure the resistance between the coil and the casing to see if it been broken down. The higher the resistance, the better, and the lowest is the same, not less than 0.5 megaohms.
6-wire Fażi Waħda mutur
The reason why there are 6 lines is that there are actually two lines (Z1, Z2) that are centrifugal switch lines. This type of electric motor also has 6 terminals, so its connecting pieces need to be removed as well. Remove the capacitor as well, and then measure the resistance values at the beginning and end of the two phase windings, as well as between the two phase windings. The method is the same as for three-phase motors.
Using a multimeter to judge the quality of a motor can only be a preliminary judgment. The insulation resistance between windings and the insulation resistance of each phase winding to ground should be measured with a megohmmeter to be more accurate.
There is ukoll a short circuit between the turns of the winding that cannot be measured, and we can only use comparative methods to guess jekk hemm a fenomenu of inter turn short circuit. For example, if the organization of a certive a sure phase is-selected of a certain phase winding is much smaller than that of other two phases, we can suspect that it has an inter turn short circuit.
