How do you measure stator winding resistance?
A practical way to measure the winding resistance is to use the Ohm’s law: Resistance = Voltage / Current. If you apply a power source to the windings and measure the voltage and current flowing through them, a simple division will yield an accurate value for the resistance. Figure 2.
What is stator winding resistance?
The stator winding dc resistance of a three-phase induction motor is measured by connecting a dc voltage source across two stator terminals. No induced rotor voltage can occur under de stator excitation and hence the resistance ‘seen’ by the dc voltage source is the stator de resistance.
How does a DVM measure resistance?
To perform a measurement with a DMM simply connect V+ to one end of the resistor and V – to the other end and set the DMM to measure resistance. The DMM supplies a constant current source to the resistor and the meter measures the voltage across it, the voltage being proportional to the resistance.
Which winding will have a high resistance?
The primary winding has more turns (more length) and less cross section area. Hence primary winding or the high volatge winding has more resistance.
What is the minimum acceptable value of insulation resistance?
Insulation resistance should be approximately one megohm for each 1,000 volts of operating voltage, with a minimum value of one megohm. For example, a motor rated at 2,400 volts should have a minimum insulation resistance of 2.4 megohms.
Can a voltmeter measure resistance?
The basic idea is that the multimeter places a voltage at the two probes and this will cause a current to flow in the item for which the resistance is being measured. By measuring the resistance it is possible to determine the resistance between the two probes of the multimeter, or other item of test equipment.
Why does high voltage winding have more resistance?
High voltage winding (primary winding in case of step down transformer) has higher resistance due to larger number of turns and thinner conductor.
How is the stator de resistance calculated in DC?
No induced rotor voltage can occur under de stator excitation and hence the resistance ‘seen’ by the dc voltage source is the stator de resistance. By applying a known dc voltage and measuring the dc current, the stator de resistance can be calculated.
What is the resistance of a stator winding?
A resistance of the stator winding Rs is defined as a resistance between a phase terminal and the center of the winding. The winding resistance is temperature dependent. Usually the resistance value at 25 °C or specified temperature is listed in the motor’s datasheet.
How is the DC resistance of an induction motor measured?
The stator winding dc resistance of a three-phase induction motor is measured by connecting a dc voltage source across two stator terminals. No induced rotor voltage can occur under dc stator excitation and hence the resistance ‘seen’ by the dc voltage source is the stator dc resistance.
How is the stator resistance estimation algorithm tested?
The stator resistance estimation algorithm was tested together with the rotor-flux-oriented induction motor drive of Fig. 37.14 implemented in the laboratory.
What should the resistance of a stator generator be?
Which is why we are all a little confused. So the STATOR coil (A.C. Generator), measured from the coil winding to the end of the black wire exiting the stator assembly should be 2.1-2.3 ohms? Section 5-1 of the shop manual states that a resistance of 1.3ohms indicates a short or short to ground.
No induced rotor voltage can occur under de stator excitation and hence the resistance ‘seen’ by the dc voltage source is the stator de resistance. By applying a known dc voltage and measuring the dc current, the stator de resistance can be calculated.
What should coil resistance be on hpow stator?
Break out the multimeter… Primary (stator) coil 2.1-2.3 ohms, secondary coil 9-11 ohms. The Secondary coil on the frame, Do I meashure from Spark Plug cap to ground? The shop manual states resistance should be 9-11ohms from the spark plug wire to ground. Is that a typo? I thought 10k (10,000)ohms was acceptable.
The stator winding dc resistance of a three-phase induction motor is measured by connecting a dc voltage source across two stator terminals. No induced rotor voltage can occur under dc stator excitation and hence the resistance ‘seen’ by the dc voltage source is the stator dc resistance.