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.