US 11,949,307 B2
Linear vibration motor with iron core and pole pieces with groove on pole piece facing connecting part between magnets
Ziang Li, Shenzhen (CN); Lubin Mao, Shenzhen (CN); Zhiyong Cui, Shenzhen (CN); and Jie Ma, Shenzhen (CN)
Assigned to AAC Microtech (Changzhou) Co., Ltd., Changzhou (CN)
Filed by AAC Microtech (Changzhou) Co., Ltd., Changzhou (CN)
Filed on Dec. 6, 2021, as Appl. No. 17/542,526.
Claims priority of application No. 202120923315.9 (CN), filed on Apr. 29, 2021.
Prior Publication US 2022/0352800 A1, Nov. 3, 2022
Int. Cl. H02K 33/02 (2006.01)
CPC H02K 33/02 (2013.01) 7 Claims
OG exemplary drawing
 
1. A linear vibration motor comprising:
a housing with an accommodation space;
a vibration unit received in the accommodation space, comprising:
a weight with a receiving space;
a magnet unit fixed on the weight and received in the receiving space; and
an elastic member configured to suspend the weight in the accommodation space;
a driving unit received in the accommodation space, fixed on the housing and configured to drive the vibration unit to vibrate along a vibration direction, comprising:
an iron core received in the receiving space;
two pole pieces fixed on two opposite ends of the iron core along the vibration direction, respectively; and
a coil wound around the iron core; wherein
the magnet unit is arranged on one side of the coil along a first direction perpendicular with the vibration direction;
the pole piece comprises a first surface facing the magnet unit; the first surface dents away from the magnet unit along the first direction for forming a groove;
the magnet unit comprises three magnets arranged successively along the vibration direction, forming a connecting part between every adjacent two magnets; the groove faces the connecting part along the first direction.