Unlock instant, AI-driven research and patent intelligence for your innovation.

Piezoelectric actuator drive control method, piezoelectric actuator drive control apparatus, and electronic device

A piezoelectric actuator and driving force technology, applied in piezoelectric devices/electrostrictive devices, piezoelectric effect/electrostrictive or magnetostrictive motors, electromechanical clocks, etc., can solve the problem of high power consumption, Reduced circuit efficiency, shortened battery life, etc., to achieve the effects of prolonging battery life, suppressing power consumption, and simplifying the structure

Inactive Publication Date: 2007-07-18
SEIKO EPSON CORP
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when driven by a normal rectangular wave pulse signal, the duty ratio of the reference pulse width is approximately 100%. However, since the output of the piezoelectric actuator is generally set far beyond what is required for driving the rotor, etc. required torque, so power is wasted
As a result, there is a problem of shortened battery life
[0007] Here, even if the current is suppressed by adjusting the voltage of the drive signal as in Patent Document 1, in a structure where the voltage can be changed, since the circuit efficiency is lowered, a large power consumption is caused, and as a result, the power saving effect cannot be achieved.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Piezoelectric actuator drive control method, piezoelectric actuator drive control apparatus, and electronic device
  • Piezoelectric actuator drive control method, piezoelectric actuator drive control apparatus, and electronic device
  • Piezoelectric actuator drive control method, piezoelectric actuator drive control apparatus, and electronic device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0101] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

[0102] In addition, in the description after the second embodiment, the same reference numerals are assigned to the same structures as those of the first embodiment described below, and descriptions are omitted or simplified.

[0103] [1. Overall structure]

[0104] FIG. 1 is a plan view showing an electronic timepiece 1 according to the present embodiment. The electronic timepiece 1 is a wristwatch. In addition to a movement 2 as a timing part, a dial 3 as a timing information display part for displaying normal time, an hour hand 4, a minute hand 5, and a second hand 6, the wristwatch also has slaves arranged on the dial 3. The upper window part 3A displays the date display device 90 of the date.

[0105] [2. Structure of Date Display Device]

[0106] FIG. 2 is a plan view showing the date display device 90 . The date display device 90 is roughly composed of...

no. 2 Embodiment approach

[0201] Next, a second embodiment of the present invention will be described with reference to FIGS. 14 to 25 . In this embodiment, it is assumed that the same piezoelectric actuator 20 is driven and controlled as in the first embodiment, and the piezoelectric actuator drive control device and method of this embodiment include the piezoelectric actuator of the first embodiment described above. Device and method for drive control. However, in the present embodiment, stable driving under phase difference feedback control is realized by implementing steps unique to the present embodiment.

[0202] [Part 2-1. Structure of electronic timepiece]

[0203] FIG. 14 is a plan view showing an electronic timepiece 1A according to this embodiment. The electronic timepiece 1A is a wristwatch as a timekeeping device. In addition to a movement 2 as a timekeeping part, a dial 3 as a timekeeping information display part for displaying normal time, an hour hand 4, a minute hand 5 and a second h...

no. 3 Embodiment approach

[0299] Next, a third embodiment of the present invention will be described.

[0300] In the present embodiment, drive control is performed to adjust the rotational speed of the rotor, which is the driven body of the piezoelectric actuator 20 .

[0301] FIG. 28 shows a drive control device 50B of this embodiment.

[0302] The drive control device 50B has, in addition to the structure of the aforementioned drive control device 50A ( FIG. 15 ), a rotation speed command value source 72 that outputs a rotation speed command value of the rotor; The rotational speed command value output from the rotational speed command value source 72 outputs a control signal to the controller 265 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A piezoelectric actuator drive control method, piezoelectric actuator drive control device, and electronic device greatly reduce power consumption. The piezoelectric actuator drive control device stores as a speed setting the minimum speed at which a rotor (driven body) turns when driven by the minimum torque required to turn the rotor (S 10 ), and to achieve this speed setting limits the pulse width of the drive signal relative to the reference pulse width of a reference signal (S 20 ). By limiting pulse width to the minimum pulse width required to drive the rotor, the pulse duty of the drive signal in a rectangular wave drive pulse train can be reduced and power consumption can be reduced greatly compared with a drive signal having a 100% pulse duty when the pulse width is not limited. Battery life can therefore be increased.

Description

technical field [0001] The invention relates to a driving control method of a piezoelectric actuator, a driving control device of the piezoelectric actuator and electronic equipment. Background technique [0002] Since piezoelectric elements have good conversion efficiency and responsiveness from electrical energy to mechanical energy, piezoelectric actuators (ultrasonic motors), which include a vibrating body with a piezoelectric element and transmit the vibration of the vibrating body to The rotor and the like are driven by the driving body. [0003] In addition, piezoelectric actuators using resonance are known to be small, thin, and high-torque, and it is expected that they will be increasingly installed in various portable devices in the future. [0004] Drive control of such a piezoelectric actuator is generally performed by supplying a driving signal of an alternating rectangular wave voltage to a piezoelectric element (for example, Patent Document 1). In Patent Doc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/00G04C3/12H01L41/09H10N30/20
Inventor 浦野治
Owner SEIKO EPSON CORP