electromechanical converter

components, electrical machinery

basis for the electric machine is usually electroinduction with magnetic induction.This device includes a stator, or as it is called constant part (typical for asynchronous, synchronous machines varying current) or inductor (instruments constant current) and the rotor, it is called active or moving part (for asynchronous and synchronous machines varying current) or anchor(constant current devices).In the role of the constant current for low-power machines are used extensively magnets (constant state).

motor power

Electric power - a physical quantity, which is characterized by the speed of the transformation well, or the transmission of electrical energy.To facilitate the understanding of the movement of electrical current are as fluid moving through the pipe, and the voltage - a difference of position of the liquid tiers.Electricity, just performing the work is moved from a low to a high capability as a liquid.So electrical power is the amount of work, some done in 1 second, or the speed of execution of the work itself.The amount of electrical current, which is routed through the cross-section of the circuit for one second, it is the current in the circuit itself.

It follows that the electric power is equal to the proportion of the voltage and current in the circuit.To determine the current power of the accepted unit - watt, abbreviated - watts.
for physical calculations it was customary to use the standard formula N = A / t, where N - Power, A - work, t - time.
There are many variations of this formula with different letter designations.

determine the engine power

If you constantly use electric machines, they often stumbled on the label which, in fact, all the specified characteristics, including power options.If you look at the image nameplate, among the various options you can see the value of the power.As can be seen, the inscription against the maximum power is a value of 1000 watts.But this is not its electrical power, as is often the consumer thinks.

on the nameplate depicted below shows the maximum allowable power of electric current.Often written on the label indicate the recommended power and its kilowatts.

So, how is it possible to calculate the power used by the engine of its own power supply.To do this, you need to look for other indicators of the same name plate of the test device - it is the efficiency and cos.Where efficiency is abbreviated efficiency, or the letter n.First, you need to take into account the connection of available capacity on the shaft mechanics and efficiency.With these values, you can easily calculate the power consumption of the motor from the mains.Learn ratio Ra = R / η.But that's not the results.We must remember, electric appliances consume from the network both active and reactive energy.If the calculations used by the engine full power, you need to get the ratio of the power triangle.

How to determine the power of the electric motor

In order to calculate the power of a certain elektrodvizhka require not enough: a current source (network), ruler (caliper), dynamometer, ammeter, plate, "according to a constant engine With the number ofpoles. "

So, let's options.Namely, to determine the power of the motor:

• current.Connect the drive to a network of electric current with a certain load (voltage).Alternately connecting to our consistency in every obvivku ammeter, measure the operating electric current in amperes engine.We determine the amount received as a result of measurements of currents.Amount multiplied by the voltage, and as a consequence - the power of the electric engine is used in watts;
• size.Determine endomentrichesky stationary part core gauge, the length, together with the ventilation channels in inches.Learn rechanged current network to which the specific motor connected and simultaneously turn the shaft frequency.What would determine the continued division, reproducible core gauge for simultaneous shaft repeatedly and multiply by 3.14, and in the same way divide by 120 (3,14 • D • n / (120 • f)) and repeatability of the network.Thus, the learned separation device, characterized by a polar.Find the number of poles, are often found by multiplying the electricity network replication by 60 and divide the resulting number for re-circulation of the shaft.Previous value is multiplied by two.Based on the decision look to the plate, "according to the definition of unchanged engine With the number of poles" find our number constant.Multiply the resulting continued on the core caliber in the square, its simultaneous turnover frequency and length.The resulting number is multiplied by 10 ^ (- 6) (P = C • D² • l • n • 10 ^ (- 6)).Scored a value of electric power in kilowatts;
• power, which produces an electric motor.Find the turnover rate of the shaft of the test instrument tachometer in rotations per second.After taking the load cell and determine the driving force of the motor.As a result of determining the power in watts is multiplied by the frequency of 6.28 rpm, and the strength and the radius of the shaft, the latter measuring ruler.

Note!Each engine is a network of a certain number of phases.An example of a three-phase motor acts, which is intended only for supply of three-phase AC power.