How To Calculate The Torque Of Your DC Electric Motor

There are a number of applications around the home and workplace that require the use of a DC electric motors. It operates by inducing a magnetic field through a series of wire windings that surround a magnetic rotor. When you need to replace your motor, it is recommended that you find out the torque of the old one (which is the name given to the force with which the shaft turns).

Step 1: Determine the power output of the motor. Generally, it will be in horsepower, but if you are using an American model it will be expressed in watts. Pull out the documentation that came with your model to determine the horsepower and revolutions per minute (RPM).

Step 2: If you cannot find the documents that came with your electric motors, you will need to calculate the horsepower yourself. You will need to divide the supply voltage by the engine’s resistance, which will give you its current. Then, multiply the voltage, current and efficiency (this will be a percentage that outlines the energy lost due to friction and heat) of the engine and divide by 746.

Step 3: Divide the horsepower by the speed of the motor (in RPM) and finish by multiplying the answer with a conversion factor of 5,252. This should provide you with the engine’s torque in foot-pounds.

Once you have established the torque of your particular DC electric motor, you will be in a much better position to find a brand new one that will meet the requirements of the application at hand. If you are unsure about some of the numbers and values asked for in the calculations outlined above, you can take your motor to a professional who will be able to do this for you.

Finding torque of servo motors

Servo motors have a great role in controlling the movement of robots, model airplane and helicopter. But what is it that makes servo motors works well? It’s the torque of the machines that makes is fit or unfit for the large machines like airplanes. People find the appropriate servo motors for their machines by calculating motor’s torque. Let us find how to do it.

• Place the motor on a flat surface preferably a table and secure it with shaft suspending at the table edge.

• Fasten the least weight object at an end of a thread and the motor shaft at the other end so that when motor runs the thread winds around the shaft. 

• Connect motor wire with the power point and observe the shaft and thread movement.

• If it winds around freely then stop the motor and replace the light weight object with a slightly heavier object and repeat the process to check if the motor still runs the same way.

• Keep increasing the weight until the motor stalls, then find the smallest weight the delayed or stop the motor. The smaller the weight you increase, the more accurate the calculation will be.

• Take measurement of the motor shaft radius and multiply the mass of the weight that stalled the motor by the radius of the shaft. The result you got is the torque of the servo motor.

If you know the way to calculate the torque, you can check whether the servo motors you bought is appropriate for your machine or not. So, the next time when you are not sure if the motor you purchased is appropriate or not, you can calculate toque with this simple method and get your answer.

Comparing Electric Motor Cars to Hybrid Vehicles

Have you ever considered what the differences might be between pure electric motor powered vehicles and hybrid energy cars? Several different models of hybrid vehicles exist, each with distinct advantages and disadvantages.

Parallel-Hybrid vehicles, for example, utilise both a traditional gasoline engine and another source of energy which provide power to the wheels in an alternating fashion. These combined power source vehicles present less of a pollution threat to the environment and make it easy for drivers to downgrade their reliance on fuel resources.

Series-Hybrid cars, on the other hand, use an electric motors to supply power directly to the wheels, while a gasoline engine is used as a generator for charging an on-board battery. In comparison to these hybrid models, pure battery vehicles have no combustion engine and rely on intermittent plug-ins to recharge the car.

This need for regular rest periods means that many people perceive hybrid vehicles as more convenient than pure electric motor cars. The convenience of an added gas engine comes at an extra cost, however, and for many users it is only needed in extreme circumstances.

Both hybrid and pure energy vehicles are widely considered to be cheaper to own and maintain than conventional gas powered cars. This is because the considerable cost of fuelling the vehicle with petrol is either reduced or cut out completely in both cases.

This cost factor is becoming increasingly important in our current environmental and financial climate, as the cost of powering conventional vehicles is becoming more and more difficult for average income families.