How To Measure Motor Inductance

How To Measure Motor Inductance. A low voltage AC signal can be applied to measure the inductance The voltage should be low enough so as not to apply enough current to damage the motors windings Author Steve Grodt.

When the motor is spinning the back EMF has a much bigger influence on current than resistance and inductance In terms of temperature and humidity temperature of the ambient air should not exceed +45℃ and the average maximum relative humidity of the wettest month is 90% Any cookies that may not be particularly necessary for the website to function and is used specifically.

How to Measure Motor Inductance and Impedance using an AC Source

Make sure the LCR meter is in an inductance measuring mode For an analog meter that’s as simple as turning the dial to the section marked L For a digital meter you need to press a button to select inductance Note that some digital meters have an automatic measurement function meaning you don’t need to select a particular mode.

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MethodTipsChoose a 100ohm resistor with 1% resistance Resistors have colored bands that can help you tell them apart A 100ohm resistor will have a brown black and brown band The final band at the far end will also be brown to represent 1% resistance If you have a bunch of resistors to choose from pick one with a known resistance value[1] X Research source Resistors are labeled when they are Connect the inductor coil in series with the resistor In series means the current passes through the coil one after the other Start setting up a circuit by placing the coil and resistor next to each other Make sure they have 1 terminal touching To finish the circuit you will also need to touch power wires to the exposed ends of the resistor and inductor[2] X Research source Purchase Wire a function generator and an oscilloscope into the circuit Take the output leads from the function generator and plug them into the oscilloscope Then turn on both devices to make sure they are working Once they are both on take the function generator’s red output lead and connect it to the red power wire in your circuit Connect the oscilloscope’s black input lead to the black Run a current through the circuit with the function generator The function generator simulates currents the inductor and resistor would receive if they were actually being used Use the control knob on the device to start the current Try setting the function generator to something like 100 or 50 ohms Make sure the generator is set to sine waves so you see big curving waves flowing Monitor the input voltage and resistor voltage on the screen Look to the oscilloscope screen for a pair of sine waves One will be controllable through the function generator The other smaller wave comes from where the inductor and resistor meet Adjust the function generator’s frequency so the junction voltage listed on the screen is half of the original input voltage[5] X Research Longer coils tend to have lower inductance than shorter coils because of their shape Thanks! Helpful 0 Not Helpful 1When a group of inductors are wired in a series their total inductance is the sum of each inductor Thanks! Helpful 0 Not Helpful 0If you wire a group of inductors parallel to one another the total inductance is much less than usual You will need to divide 1 by each inductance add up the total then divide 1 by that number Thanks! Helpful 0 Not Helpful 0Inductors can be constructed as bar coils ringshaped cores or a thin film The more turns or area the coil has the greater its inductance will be Thanks! Helpful 0 Not Helpful 0 64% (40)Views 5838K.