These days, direct current (or DC) electric motors are used in a wide range of applications, such as the moving windows and seats in your car. Because of the concealed nature of these motors, it can be highly difficult to complete any repairs or maintenance on them without having to pull whatever it is powering apart. This is why, once you have managed to get to your DC electric motor, you should always give it a quick check to see whether it has gone “bad” and needs to be replaced.Begin by removing the DC motor from its mount, ensuring that you have also removed any source of electric power that could accidentally cause it to begin turning. You may need to follow the manufacturer’s instructions to do this, as some motors are very much wedged into position and could pose a risk of electrocution.Next, you can test the electric motor’s continuity (or connection) by attaching it to a volt ohmmeter. Ensure that the meter is in the “ohms” position, then place the red and black leads into its connections (the red lead should be attached to the “ohms” and the black lead to the “common” point). Test that the meter is working properly by touching these two leads together – the screen should read zero ohms (or full continuity).To test your DC motor, touch the leads of the ohmmeter to the leads of the motor. The meter’s screen should indicate a low resistance (somewhere between 10 and 30 ohms), but if it reads an infinite ohms or an open circuit you should rotate the end shaft of the motor. The ohmmeter should give different readings as this shaft is rotated (which is an indication that the electric motor itself is good, but that there is a problem with the electrical circuit. If the meter is still reading as an open circuit, the conducting brushes may have gone “bad”.Use a screwdriver to remove the brushes from the end of the electric motor (you can find them under the plastic end caps at the opposite end of the motor to the drive shaft). Carefully inspect the brushes for any sign of cracks or breaks in the surface – the area of the brush that sits against the conductor or commutator should be smooth and curved. If there are any broken wires or springs, the motor will fail. If the brushes appear fine, then the problem may be with the commutator.Take the screwdriver again and use it to remove the rear end cap of the DC electric motor (by removing the two screws that run the motor’s length). Inspect the plates that comprise the commutator assembly – there should be an opening between each. If you notice any broken wires or burnt varnish, the commutator has failed and its damaged parts will need to be replaced.
This information is provided to give a brief overview and highlight some of the key aspects of the different magnetic motors that have been created by Michael Brady (Perendev Motor), Howard Johnson (HoJo Motor) and Edwin Gray’s Electromagnetic Motor. There are various “free energy” devices in existence and some of the exceptional devices functioning as highly efficient magnetic motors have actually been awarded with official patents.It is definitely not an easy task of acquiring intellectual property rights through patents and this process firstly requires a new invention created by the inventor(s) and also the legal advice of a good intellectual property attorney. Any new device must be replicated with the patent application stating the claim to the new idea and submitted to the patent office. The patent office thoroughly examines and tests the device for a few years and may award a patent if they are convinced. It is important to understand that patents are not awarded for claims without a proof of concept prototype to demonstrate the concept.There are ways to counter the conditions which are destructive to permanent magnets. The problem of excessive heat can be addresses by cooling the magnet using heat sinking techniques such as aluminium housing for the rotor and stator magnets, or liquid cooling. The main aim is to rapidly transfer the heat from the magnet into a suitable radiator. Excessive shock is easily countered by careful handling and not allowing the magnet to impact with other surfaces such as the floor, metals that are attracted and other magnets. Magnet keepers also help preserve magnets by keeping the magnet’s fields mostly within the enclosure, which is necessary for storage and transport of magnetic materials.Also in the 70’s, Edwin Gray was awarded patents for his Electromagnetic Motor which continually spins without depleting the power source that energises the electromagnets and spins the motor. Edwin Gray’s motor did require the initial spin to “kick-start” the motor into operation. Edwin Gray also connected his Electromagnetic Motor to an electrical generator and produced an excess amount of useable electricity. Gray’s motor is also an excellent candidate for a drive motor in an electric generator set because no fuel is required in its operation. This motor does require an electric source such as a car battery to provide the initial starting power, however the battery is fully recharged once stable operation is achieved.When considering the long term performance of these three different motors, Howard Johnson’s motor and Edwin Gray’s motor outperform the Perendev motor built by Mike Brady. It is important to note that Howard Johnson and Edwin Gray patented their magnetic motors in the 1970’s and were likely to have been invented quite few years before the patent office received the patent applications. It is also interesting to note that Michael Brady built his motor around 20 years after Howard Johnson’s patents were awarded.
Ok, another generalized topic of auto mechanics is replacing loose motor mounts. Now, there are generally only two reasons to replace a motor mount. 1) You are putting in a different engine that needs different motor mounts, or 2) You have cracked the old ones or they no longer snug up to the frame of the car or the engine block.It is important to remember that motor mounts should never really have to be replaced unless they are broken. If they are loose, it would be better to just go in and tighten them.In any case, let’s go through a simple explanation of replacing your Motor Mounts. It will have to be general because with out knowing anything precise about the vehicle you are replacing them in; it is hard to give details.Step One: Lifting the EngineIn order to get to the motor mounts and take them off to replace them, you will need to hoist the motor. This can be done with our without disconnecting the transmission or transaxle, but you will still need to go through the same process that you would to remove your engine.During the process of removing the engine, you will need to take off the bolts that hold the motor mounts to the frame of the vehicle. Then, you can freely lift the motor to get access to the rest of the mount on the block of the engine.Step Two: Remove the Motor MountsThere should be 2 to 4 bolts holding the motor mount onto the block of the engine and you will need to pull them off. If you are changing the bracket that holds the motor mount on the frame of the vehicle, you will also need to remove that.Step Three: Put on your new Motor MountsReplace the motor mounts on the block of the engine and the bracket onto the frame of the car if needed. Make sure your bolts are tightened as far as they can go without breaking them. This will keep you from having ‘loose’ motor mounts in the future.Let your engine down a little on the hoist until the mounts fit squarely into the brackets on the frame of the vehicle. Once they are lined up, replace the bolts that hold them together while you still have the engine slightly hoisted. This will help make your job easier.Step Four: Reconnect the EngineYou will need to reconnect any parts, hoses, lines or harnesses that you have removed to hoist the engine up. Make sure everything goes back in its correct place.Step Five: Wiggle Room!Get inside the engine compartment and push down on the engine vigorously. You are checking to make sure your engine is securely in place and that there is no longer any signs of a ‘loose’ motor mount.Step Six: Test DriveAs you can see it is possible to do this safely without disconnecting the transmission or the transaxle. Take your vehicle for a test drive to make sure you have repaired the necessary parts and that it is functioning properly.