Motor assembly and linear compressor with same

The motor assembly comprises an inner magnet yoke, an outer magnet yoke and main magnetic steel, the outer magnet yoke is arranged on the outer side of the inner magnet yoke at intervals, a coil and two pieces of auxiliary magnetic steel are arranged on the outer magnet yoke, the main magnetic steel is arranged between the inner magnet yoke and the outer magnet yoke, and the auxiliary magnetic steel is arranged between the inner magnet yoke and the outer magnet yoke. Under the action of electromagnetic force, the inner magnet yoke reciprocates in the axial direction of the inner magnet yoke. The linear compressor comprises a cylinder seat, a piston and the motor assembly, wherein the cylinder seat is provided with a compression cavity; the piston is slidably arranged in the compression cavity, and main magnetic steel of the motor assembly is connected with the piston so as to drive the piston to reciprocate in the compression cavity. According to the motor assembly provided by the embodiment of the invention,