The difference between a linear motor to a bar motor or coin type motor

At first, the smart mobile phone is mainly used to provide feedback to the user’s voice, and later with the mobile phone software is more and more abundant, the user experience on the use of increasingly high demand, use sound to provide feedback has been unable to meet the demand of users of intelligent mobile phone. As a result, part of the smart phone began to use the motor to provide vibration and touch, but with the increasingly thin cell phone, the traditional rotor motor can no longer meet the new requirements, so the linear motor came into being.

And what’s the difference between a linear motor and a tradtional bar motor and coin type motor.

Pls refer to as follows: