Method for driving vibrating motor

• US 9,774,289 B2
• Filed: 03/27/2016
• Issued: 09/26/2017
• Est. Priority Date: 07/20/2015
• Status: Active Grant

• Current Assignee: AAC Technologies Pte Limited (AAC Technologies Holdings Inc.)
• Original Assignee: AAC Technologies Pte Limited (AAC Technologies Holdings Inc.)
• Inventors: Wang, HongXing
• Primary Examiner(s): Leykin, Rita
• Application Number:
  US15/081,913
• Publication Number:
  US 20170025980A1
• Time in Patent Office: 548 Days
• Field of Search: 318114, 318119, 310317, 310 15, 310 81, 322 3, 3404071, 715701, 715702
• CPC Class Codes: H02P 25/032 Reciprocating, oscillating or vibrating motors

Abstract

A method for driving a vibrating motor is provided in the present disclosure. The method includes the following steps: providing a driving signal to a vibrating motor; detecting a vibration direction of a vibrating unit of the vibrating motor; determining whether the driving signal facilitates vibration of the vibrating unit; and switching a polarity of the driving signal when the driving signal does not facilitate the vibration of the vibrating unit.

Claims

1. A method for driving a vibrating motor, comprising the following steps:

providing a driving signal with an adjustable signal period to a vibrating motor, the vibrating motor including a vibrating unit performing linear vibration, the vibration direction of the linear vibration having a positive moving direction and a negative moving direction contrary to the positive moving direction, the driving signal comprising a positive driving signal for generating a positive driving force to the vibrating unit along the positive moving direction and a negative driving signal for generating a positive driving force to the vibrating unit along the negative moving direction;

detecting a vibration direction of the vibrating unit of the vibrating motor by a detector, a first detecting signal generated when the vibrating unit is excited in the positive moving direction, a second detecting signal generated when the vibrating unit is excited in the negative moving direction;

determining whether the driving signal facilitates vibration of the vibrating unit, if the direction of driving force corresponding to the driving signal is coincident with the vibration direction of the vibrating unit, the driving signal facilitating the vibrating unit along the moving direction, otherwise the driving signal hindering the vibration of the vibrating unit; and

switching a polarity of the driving signal when the driving signal does not facilitate the vibration of the vibrating unit.

2. The method for driving a vibrating motor as described in claim 1, wherein the driving signal is a periodic electric signal, and each signal period of the driving signal comprises a positive sub-period and a negative sub-period, the driving signal is a positive driving signal in the positive sub-period, and is a negative driving signal in the negative sub-period.

3. The method for driving a vibrating motor as described in claim 2, wherein the driving force comprises a positive driving force corresponding to the positive driving signal, and a negative driving corresponding to the negative driving signal.

4. The method for driving a vibrating motor as described in claim 3, wherein the vibration direction of the vibrating unit is detected by a detector integrated in an electronic device in which the vibrating motor is applied.

5. The method for driving a vibrating motor as described in claim 4, wherein the vibration direction of the vibrating unit is detected by detecting an induced potential generated by a metal part of the vibrating motor.

6. The method for driving a vibrating motor as described in claim 5, wherein the metal part generates a first induced potential when the vibrating unit moves in a positive moving direction, and generates a second induced potential when the vibrating unit moves in a negative moving direction.

7. The method for driving a vibrating motor as described in claim 1, wherein when the positive driving signal is applied to the vibrating motor while the vibrating unit moves in a positive moving direction, or when the negative driving signal is applied to the vibrating motor while the vibrating unit moves in a negative moving direction, the driving signal is determined as facilitating the vibration of the vibrating unit.

8. The method for driving a vibrating motor as described in claim 7, wherein when the positive driving signal is applied to the vibrating motor while the vibrating unit moves in the negative moving direction, or when the negative driving signal is applied to the vibrating motor while the vibrating unit moves in the positive moving direction, the driving signal is determined as not facilitating the vibration of the vibrating unit.

9. The method for driving a vibrating motor as described in claim 1, wherein when the driving signal is a positive driving signal and is determined as not facilitating the vibration of the vibrating unit, the driving signal is switched to a negative driving signal.

10. The method for driving a vibrating motor as described in claim 9, wherein when the driving signal is a negative driving signal and is determined as not facilitating the vibration direction of the vibrating unit, the driving signal is switched to a positive driving signal.

11. The method for driving a vibrating motor as described in claim 10, further comprising:

determining whether a vibration period of the vibrating unit reaches a natural period; and

adjusting a signal period of the driving signal to a natural period of the vibrating unit.

12. The method for driving a vibrating motor as described in claim 1, wherein the driving signal is a periodic electric signal with a fixed signal period equal to a natural period of the vibrating motor.

13. The method for driving a vibrating motor as described in claim 12, further comprising:

determining whether the driving signal stops being provided to the vibrating motor; and

controlling the vibrating unit to stop vibration when the driving signal stops being provided to the vibrating motor.