Development of 2phase/4phase flat-type vibtration motor

The flat-type vibration motor is very important component in the mobile communication device industry. The thinner the mobile devices are, the more flat-type vibration motors are needed. So, it is impossible to survive in market without thinking mass-production cost. In that point of view, 2phase vibration motor has some merit like less component number except the fatal defect of starting failure. By adopting double winding coils, we can solve the problem of starting failure without additional expensive mass-production cost.