The utility model discloses a moving coil
permanent magnet linear motor having
high power density. The utility model comprises a coil
assembly, a coil
assembly frame, an inner magnetic yoke, a permanent
magnet, an outer magnetic yoke and other components; the coil
assembly comprises a forward winding and a reverse winding; the coil assembly is fixed on the coil assembly frame, and is capable of making reciprocating
linear motion in an air gap; the coil assembly frame is connected with the driven moving elements; the direction and the size of the current is regulated through an
electric control system, and then the needed
motion mode is realized. The permanent
magnet group is arranged at one side or both sides of the coil assembly; the permanent
magnet group alternately adopts permanent magnets with different magnetic directions along
motion direction and forms a
Halbach array. The utility model has the advantages that, the
power density of the motor is improved obviously, which is 50% more than the
power density of conventional linear motors; meanwhile, the utility model has better control characteristic. The utility model can be used as an executive element and applied to the situations where the volume and the
mass of the
linear motor need to be small, and the thrust and the accuracy of the
linear motor need to be large; for example, the utility model can be applied to the electro-hydraulic
proportional control field, the
robot field or other fields.