Motor winding resistance test
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If you like saving money and preventing down time, then this one is for you! With a preventative maintenance plan, you can schedule reconditioning or repairs before complete service failure.
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The actual values might vary depending on the temperature or humidity, so make sure you’re keeping good records. By the way, good insulation has a high resistance, whereas poor insulation has a relatively low resistance. Typically, the resistance drop is gradual though, which is where electrical testing comes in!Ĭhecking your motor’s insulation periodically is key. And once that starts, there’s no turning back. Over time, these rascals cause tiny holes and cracks, allowing moisture or foreign particles to leak into the surface of the insulation – giving way to a low resistance path for leakage current. However, despite major manufacturing improvements to motors over the years, insulation is still susceptible to classic wear and tear, as well as other villains like mechanical damage, vibration, excessive heat or cold, dirt, oil, corrosive vapors, moisture from processes, or just natural humidity, which can cause insulation failure. If you’re working with brand-new, shiny motors in your plant, then your electrical insulation should be in tip top shape. Why should you be running insulation resistance tests on your motor? Why would you need to Megger a motor? Or better yet… To each their own, right? Plus, this is a blog, not a lecture hall. Plus, we’re flattered that you’re throwing around our name so much, so we can’t complain.īut what you’re really asking is – how can you run an insulation resistance test on a motor? And that is a question we can definitely help you with, regardless of whether you say Megger, megging, or meg a motor. Megger is a registered trademark, not a verb, but we get it – old habits die hard. Each of the sets of windings should read about the same ohms value.Well, if we’re nit-picking, technically speaking, you can’t ‘Megger’ a motor. Keep the multi-meter set for 30,000-ohms and touch one test lead to one terminal and the other to another terminal. Test for direct shorts in the motor's power windings in induction (non-brush type) motors. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. If there is any reading on any of these then the motor is bad, do not use it. With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. It will usually be low enough (under 30 Ω) for the audible continuity indicator to sound.Īlso, how do you check a motor with a multimeter? The smaller the motor, the higher this reading will be, but it should not be open. If your spindle motor fails the test, you may want to make sure the problem is not with the connector, which may have coolant on it that's interfering with your results.įurthermore, should motor windings have continuity? The windings (all three in a three-phase motor) should read low but not zero ohms.
#MOTOR WINDING RESISTANCE TEST HOW TO#
How to Test Your Spindle Motor for Open or Short in Windings Similarly, how do you check motor windings with a multimeter? Remember that the three phases have identical windings or nearly so! The ohms reading for each winding must be the same (or nearly the same). AC Motor Winding Resistance Test Check the motor winding resistance or ohms reading using a multimeter or ohmmeter for phase to phase terminal ( U to V,V to W ,W to U ).