Thrust compensation system of dual-winding voice coil motor

• US 9,621,084 B2
• Filed: 09/09/2014
• Issued: 04/11/2017
• Est. Priority Date: 09/30/2013
• Status: Active Grant

• Current Assignee: Harbin Institute of Technology
• Original Assignee: Harbin Institute of Technology
• Inventors: Li, Liyi, Pan, Donghua, Guo, Qingbo, Zhang, Chengming, Cao, Jiwei
• Primary Examiner(s): Leykin, Rita
• Application Number:
  US15/023,401
• Publication Number:
  US 20160211782A1
• Time in Patent Office: 945 Days
• Field of Search: 318135, 318119, 318118, 310 10, 310 15, 310 1201, 310 36, 310 1217, 310 1208, 310 1216
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 41/0356 moving along a straight path
• CPC Class Codes: H02P 25/034 Voice coil motors voice coil motors driven by DC power H02P7/025
• CPC Class Codes: H02P 7/025 the DC motors being of the moving coil type, e.g. voice coil motors

Abstract

A thrust compensation system of a dual-winding voice coil motor, which is used for driving the voice coil motor having main windings (100) and secondary windings (200), wherein the secondary windings (200) of the voice coil motor are between each pair of the main windings (100). The system includes a switch drive circuit of the main windings (800) which is powered by a first controlled voltage source to drive the main windings (100) adopted as the main working windings of the voice coil motor and used for providing the output electromagnetic force required by the driving system of the voice coil motor in work; a switch drive circuit of the secondary windings (900) which is powered by a second voltage source to drive the secondary windings (200) adopted as compensation windings, and used for providing the thrust ripple opposite to the main windings (100) so as to compensate the thrust ripple of the main windings (100) and keep the resultant force of the output of the main windings (100) and the secondary windings (200) of the voice coil motor in constant; wherein the voltages U_dc1 and U_dc2 of the first and second controlled voltage sources of the main windings (100) and the second windings (200) are configured as meeting a certain relationship.

Claims

1. A thrust compensation system comprising:

a switch drive circuit of main windings of a voice coil motor that is powered by a first controlled voltage source to drive the main windings adopted as the main working windings of the voice coil motor and used for providing the output electromagnetic force required by a driving system of the voice coil motor in work;

a switch drive circuit of secondary windings of the voice coil motor that is powered by a second voltage source to drive the secondary windings adopted as compensation windings and used for providing the thrust ripple opposite to the main windings to compensate the thrust ripple of the main windings and keep the resultant force of the output of the main windings and the secondary windings of the voice coil motor constant;

wherein the voltages U_dc1 and U_dc2 of the first and second controlled voltage sources of the main windings and the second windings are configured as

2. The thrust compensation system as claimed in claim 1, wherein R₂ is adjustable.

3. The thrust compensation system as claimed in claim 2, wherein the thrust ripple of the system can be reduced while the average thrust can be kept at the same time.

4. The thrust compensation system as claimed in claim 1, wherein R₂ is proportional to R₁.

5. The thrust compensation system as claimed in claim 1, wherein the ratio of R₂ of the secondary windings to R₁ of the main windings is proportional to the ratio of L₂ to L₁.

6. The thrust compensation system as claimed in claim 5, wherein the proportion of the ratio of R₂ to R₁ to the ratio of L₂ to L₁ is larger than 1.

7. The thrust compensation system as claimed in claim 1, wherein the drive circuits of the main windings and the secondary windings are H-shaped full-bridge drive circuits.

8. The thrust compensation system as claimed in claim 1, wherein the system is for a dual-winding voice coil motor, which is used for driving the voice coil motor having the main windings and secondary windings, wherein the secondary windings of the voice coil motor are between each pair of the main windings.

9. A thrust compensation system of a dual-winding voice coil motor, including a voice coil motor, wherein the voice coil motor includes main windings, a magnetic steel and a permanent magnet, and further includes secondary windings arranged between a pair of main windings of the voice coil motor;

wherein the main windings are the main working windings of the voice coil motor, driven by a switch drive circuit of the main windings which is powered by an independent controlled voltage source, and used for providing the electromagnetic force required by the driving system of the voice coil motor in work;

the secondary windings are compensation windings, driven by a switch drive circuit of the secondary windings which is powered by another independent controlled voltage source, and used for providing the thrust ripple opposite to the main windings so as to compensate the thrust ripple of the main windings and then keep the resultant force of the output of the main windings and the secondary windings of the voice coil motor in constant;

wherein the voltages U_dc1 and U_dc2 of the controlled voltage sources of the main windings and the second windings are configured as

10. The thrust compensation system of the dual-winding voice coil motor as claimed in claim 9, wherein the main windings and the secondary windings of the voice coil motor are shaped of layered type or joint filling type.

11. The thrust compensation system of the dual-winding voice coil motor as claimed in claim 10, wherein the secondary windings are enclosed between the two layers of the main windings, and the main windings at the internal side are enclosed on the external layer of the winding pillar.

12. The thrust compensation system of the dual-winding voice coil motor as claimed in claim 10, wherein the secondary windings are clamped between the upper main winding and the lower main winding, and the winding pillar passes through the upper main winding, the secondary winding and the lower main winding from upside to downside.

13. The thrust compensation system of the dual-winding voice coil motor as claimed in claim 9, wherein the main windings, the secondary windings and the winding pillar are encapsulated in a primary winding support plate through epoxy glue;

wherein the primary winding support plate is supported through a primary support pedestal; and

wherein a secondary magnetic steel is connected with a secondary support structure through a yoke plate.