Hub motor engine composition and structure
The engine is a machine capable of transforming a source of energy, which may be in chemical form (in the presence of a fuel), electrical or thermal energy, mechanical energy or work in a continuous mechanical (devices capable of this transformation so impulsive and discontinuous are called actuators, piezoelectric muscles, valves, relays, etc..).
In a philosophical sense, a hub motor is the body that causes the movement or change in other affiliated institutions: Aristotle spoke of "unmoved mover", a term taken up by other philosophers, to indicate the cause of the universe, ie the 'object or person (according to his philosophy) was the principle.
Engine is also used in computer science (graphics engine, search engine, database engine ...) to describe a program that "transformed" into something else something automatically and continuously. More precisely in an engine is a computer program that, in the course of its normal operation:
1.You never ends, unless you have technical problems or who is not deliberately stopped;
2.Develop its output from a set of data and / or default procedures;
3.E intended to be used by other programs and not directly by humans
All physical real engines of any kind may be, are subject to the laws of thermodynamics, this means all work will provide a lower total energy contained in the fuel spent on their operation. The relationship between the work supplied and the energy expended by a particular motor is its gross return, including the fraction of energy spent on the inner workings of the engine. It is always lower than the thermodynamic efficiency, performance (not measured, but calculated) for the same engine considered "ideal", ie no internal energy dissipation.
In particular, the efficiency of internal combustion engines depends critically on the initial temperature and end of their cycle, and for a given temperature drop δT will be smaller than that of the Carnot cycle in the same δT.
The most commonly used engines are alternatives and / or rotary, and produce work in the form of a torque or a force on an axis; others produce only a linear force.
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