Greetings all! This is my first post. I did a brief search on this topic, but it didn't help in my search for an answer.
The question: Why can't you use permanent magnets alone to make a perpetual magnet motor? The knee jerk response from the little bit of searching I have done was "...violation of the conservation of energy.", "...no free lunch.", etc. My all time favorite is some sort of assertion of a Lorentz force. Lay men's terms a charged particle experiences a force perpendicular to its velocity in a perpendicular B field. Since the force and the velocity aren't in the same direction work cannot be done. This may be the reason, but I cannot understand how it applies to bar magnets that are electrically neutral or close to neutral, ie no charge on them.
In Irving M. Gottlieb's book Electric Motors and Control Techniques on page 9-10 he asserts that its a matter of "switching logic" that is keeping the perpetual motor from occurring and that maybe long winter evenings should be used to discover the correct switching order of the magnetic poles of permanent magnets.
Is Mr. Gottlieb's assertion incorrect? If so, why? I don't see how someone's response such as "read a physics book" can help when I am sure people who have these questions have read or are reading them and still cannot find the appropriate E&M law that would keep permanent magnets from forming a perpetual motor.
Please help me to understand why it's not possible. I have read many chapter's in Halladay & Resnick's physics book trying to discover the answer as to why some many people cannot tolerate the idea of perpetual motors with permanent magnets.
Thanks
The question: Why can't you use permanent magnets alone to make a perpetual magnet motor? The knee jerk response from the little bit of searching I have done was "...violation of the conservation of energy.", "...no free lunch.", etc. My all time favorite is some sort of assertion of a Lorentz force. Lay men's terms a charged particle experiences a force perpendicular to its velocity in a perpendicular B field. Since the force and the velocity aren't in the same direction work cannot be done. This may be the reason, but I cannot understand how it applies to bar magnets that are electrically neutral or close to neutral, ie no charge on them.
In Irving M. Gottlieb's book Electric Motors and Control Techniques on page 9-10 he asserts that its a matter of "switching logic" that is keeping the perpetual motor from occurring and that maybe long winter evenings should be used to discover the correct switching order of the magnetic poles of permanent magnets.
Is Mr. Gottlieb's assertion incorrect? If so, why? I don't see how someone's response such as "read a physics book" can help when I am sure people who have these questions have read or are reading them and still cannot find the appropriate E&M law that would keep permanent magnets from forming a perpetual motor.
Please help me to understand why it's not possible. I have read many chapter's in Halladay & Resnick's physics book trying to discover the answer as to why some many people cannot tolerate the idea of perpetual motors with permanent magnets.
Thanks