Three Zone Permanent Magnetic Structures and Their Applications 2015-01-0141
Linear electric motors designed on the basis of permanent magnets have disadvantage. It is caused by nonlinear distribution of a magnetic flux density around the cylindrical permanent magnet. Therefore, the motors should be designed with the high level reserve power. It lids to increase of mass - dimensional parameters of a motor. In addition, it complicates a control system of an electric drive on base of the linear motor. These disadvantages are eliminated by using, offered by authors, of three-zoned permanent magnetic structures. Using the three zone magnetic structures on basis Nd-Fe-B permanent magnets allows reducing weight - dimensional parameters of the linear motor. In this paper is considered design technique of creation the tree zone magnet structure. As an example, it was designed linear electrical motor (actuator) for diesel speed electronic controller. Prototype electronic speed controller was build and tested. In the electronic speed controller, the linear motor works in mode of position control. The brushless sensor rod position, suggested by authors, was used for realization feedback. Results of the electric drive test show linear dependence of the developed mechanical force from actuator shaft (magnet) position. The suggested linear electric actuator has simple design configuration, dependable, and produces high level force on motor output shaft. Linear electric motor can find different application in the car system engineering.