you need
• - Tester;
• - table of the dependence of the engine from the number of poles;
• - dynamometer.
Guide
1
Turn the motor by connecting it to a power supply with a nominal voltage for which it is designed.Connect the tester in series with each winding, adjusting it to the current measurement.Find the product of the current in each winding and tension.Get the results add up.This will be the rated power of the electric motor.Voltage is measured in volts, amperage, then get the engine power in watts.
2
To determine the power of the electric motor , without connecting it to the mains, make these steps: 1. vernier calipers, measure the inner diameter
of the stator core, and its length in millimeters.2. Determine the frequency of the current in the network.3. Determine the synchronous speed of the shaft.4. The number of 3.14, multiply the diameter of the core and the synchronous frequency of the shaft.The result is divided by the number 120 and the frequency of the current in the network.The resulting number - the pole pitch of the scale.5. Find the number of poles by multiplying the current rate by 120 and dividing by the frequency of rotation of the motor shaft.6. As a specialized table, at the intersection of the values ​​of pole pitch and get the number of poles of the motor constant .7. Multiply constant at the core diameter squared its same length and synchronous speed.For power in kilowatts, multiply the result by 10 ^ (- 6).
3
To determine the net power motor with tachometer to measure shaft speed frequency in hertz (revolutions per second).Dynamometer, determine the traction force exerted by them.For this operation, it is best to use a special stand.To determine the value of the net power of the electric motor , multiply the number 3.14 to the measured force, the speed of the shaft and its diameter.