Motor with stator having inner cores and outer cores

DETAILED DESCRIPTION It is an object of the present invention to provide a motor that has a relatively simple structure and yet has a uniform rotational characteristic.
In accordance with an embodiment of the present invention, a motor has a stator with a simplified structure having a stator section including at least two core pairs.
Each of the core pairs includes inner and outer cores.
Coils are wound around the core pairs.
A case made of a magnetic material covers the coils in a manner that the case more securely comes in contact with the inner cores and the outer cores.
The case is welded to at least the inner cores to securely form independent magnetic circuits.
In accordance with another embodiment of the present invention, the case is welded to the inner cores and the outer cores to securely form independent magnetic circuits.
As a result, there is no need to incorporate steps in a manufacturing process, which could lead to increased costs, such as, for example, finishing a case with more stringent dimensional precision against inner cores or employing a deep drawing method in order to achieve a higher dimensional precision in the cylindrical curved surface of the case.
Other features and advantages of the invention will be apparent from the following detailed description, taken in conjunction with the accompanying drawings that illustrate, by way of example, various features of embodiments of the invention.