CN111010049A - Ultrasonic motor and speed control method thereof - Google Patents
Ultrasonic motor and speed control method thereof Download PDFInfo
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- CN111010049A CN111010049A CN201911352395.0A CN201911352395A CN111010049A CN 111010049 A CN111010049 A CN 111010049A CN 201911352395 A CN201911352395 A CN 201911352395A CN 111010049 A CN111010049 A CN 111010049A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000919 ceramic Substances 0.000 claims description 5
- 230000004044 response Effects 0.000 abstract description 14
- 238000002347 injection Methods 0.000 abstract description 10
- 239000007924 injection Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
- H02N2/14—Drive circuits; Control arrangements or methods
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Abstract
The invention discloses an ultrasonic motor, relates to the technical field of medical facility equipment, and solves the technical problem that the response speed of the conventional high-pressure injector cannot meet the requirement. It includes the pivot, still includes first stator and second stator, install first rotor and second rotor in the pivot, first stator rotates with the pivot to be connected, just first stator is located the outside of first rotor, the second stator rotates with the pivot to be connected, just the second stator is located the outside of second rotor. The invention also discloses a speed control method of the ultrasonic motor. The invention has reasonable structure, can effectively improve the response speed of the motor, has stable and reliable operation and well meets the requirement of quick response of the high-pressure injector during injection.
Description
Technical Field
The invention relates to the technical field of medical facility equipment, in particular to an ultrasonic motor and a speed control method thereof.
Background
With the rapid development of medical technology, high-pressure syringes have been widely used. In clinical use, the requirements on the injection pressure and the injection speed of the high-pressure injector are relatively high, and meanwhile, the response speed of the high-pressure injector is extremely high. If the response speed of the high-pressure injector is not fast enough during the injection process, the situation that the injection pressure does not reach the set requirement easily occurs, and the situation that the injection dose does not reach the requirement easily results. Most of the existing driving mechanisms of high-pressure injectors use stepping motors, but the response speed of the stepping motors to the control of the rotating speed is slow, and the high requirement of the high-pressure injectors on the injection speed is difficult to meet.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and aims to provide an ultrasonic motor which effectively improves the response speed of the motor.
The second purpose is to provide a speed control method of the ultrasonic motor, which effectively improves the response speed of the motor.
In order to achieve the first purpose, the invention provides an ultrasonic motor, which comprises a rotating shaft and is characterized by further comprising a first stator and a second stator, wherein the rotating shaft is provided with a first rotor and a second rotor, the first stator is rotatably connected with the rotating shaft and is positioned on the outer side of the first rotor, the second stator is rotatably connected with the rotating shaft and is positioned on the outer side of the second rotor.
In a further improvement, the first stator and the second stator are both piezoelectric ceramic stators.
Further, the first stator comprises a plurality of first driving teeth, end faces of the first driving teeth are arranged opposite to outer side faces of the first rotor, the second stator comprises a plurality of second driving teeth, and end faces of the second driving teeth are arranged opposite to outer side faces of the second rotor.
Furthermore, an integrated mounting disc is arranged on the rotating shaft, the first rotor and the second rotor are symmetrically mounted on the mounting disc, and the first stator and the second stator are symmetrically arranged on the rotating shaft.
Furthermore, the motor further comprises a shell, a first base and a second base, wherein the first stator is installed on the first base, the second stator is installed on the second base, and the first base and the second base are installed on two sides of the shell in a distributed mode.
In order to achieve the second object, the present invention provides a speed control method of an ultrasonic motor, wherein a first frequency signal is transmitted to a first stator to make the motor obtain an initial speed; transmitting a second frequency signal to a second stator to enable the motor to obtain a first speed; and controlling the rotating speed of the motor according to the signal characteristic of the second frequency signal relative to the first frequency signal.
In a further improvement, the signal characteristic is a phase difference of the second frequency signal relative to the first frequency signal, and the rotation speed of the motor is changed according to the phase difference of the second frequency signal relative to the first frequency signal.
Further, the first frequency signal and the second frequency signal are both PWM signals, and the frequencies of the first frequency signal and the second frequency signal are both consistent.
Advantageous effects
The invention has the advantages that: the high-pressure injector is driven by the double-stator double-rotor motor, and when the rotating speed of the motor needs to be adjusted, only the phase difference of input signals of the two stators needs to be controlled, so that the two rotors rotate asynchronously, the rotating speed of the motor is reduced, and the rotating speed of the motor is quickly adjusted. Compared with the existing technical means of reducing the rotating speed of the stepping motor by adjusting the PWM frequency, the invention realizes faster adjusting response speed of the rotating speed by adjusting the phase difference of the input signals of the stator, has more stable operation and better meets the requirements of quick response and quick injection of the high-pressure injector during injection.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an exploded schematic view of the present invention;
fig. 3 is a front view of an exploded view of the present invention.
Wherein: 1-rotating shaft, 2-first stator, 3-second stator, 4-first rotor, 5-second rotor, 6-mounting disk, 7-shell, 8-first base, 9-second base, 21-first driving tooth and 31-second driving tooth.
Detailed Description
The invention is further described below with reference to examples, but not to be construed as being limited thereto, and any number of modifications which can be made by anyone within the scope of the claims are also within the scope of the claims.
Referring to fig. 1 to 3, a speed control method of an ultrasonic motor according to the present invention includes a rotating shaft 1, and further includes a first stator 2 and a second stator 3. Install first rotor 4 and second rotor 5 on the pivot 1, first stator 2 rotates with pivot 1 to be connected, and first stator 2 is located the outside of first rotor 4, and second stator 3 rotates with pivot 1 to be connected, and second stator 3 is located the outside of second rotor 5. This motor is the structure of two stators birotors promptly, and first stator 2 acts on first rotor 4, and second stator 3 acts on second rotor 5, and pivot 1 rotates under the combined action of first rotor 4 and second rotor 5 to the rotation of motor has been realized. If the rotating speed of the motor needs to be adjusted, only the phase difference of input signals of the two stators needs to be controlled, so that the two rotors rotate asynchronously, the rotating speed of the motor is reduced, and the rotating speed of the motor is quickly adjusted. Compared with the existing technical means of reducing the rotating speed of the stepping motor by adjusting the PWM frequency, the motor realizes higher speed response of adjusting the rotating speed by adjusting the signal phase difference of the stator; and due to the asynchronization of the double-stator double-rotor motor, the rotating speed of the motor is about twice higher than that of the prior art under the condition of consistent input signals, the motor is more stable to operate, and the requirement of quick response of a high-pressure injector during injection is well met.
The first stator 2 and the second stator 3 are both piezoelectric ceramic stators. The input signal can directly act on the piezoelectric ceramic stator to make the piezoelectric ceramic stator jump and contact with the rotor, so that the rotor rotates. Compared with a stepping motor using a coil, the whole quality of the high-pressure injector is effectively reduced, so that the high-pressure injector is lighter. The first stator 2 of the present embodiment includes a plurality of first drive teeth 21, end faces of the first drive teeth 21 being arranged opposite to the outer side face of the first rotor 4, and the second stator 3 includes a plurality of second drive teeth 31, end faces of the second drive teeth 31 being arranged opposite to the outer side face of the second rotor 5. Because the driving teeth are not directly connected, the driving teeth can jump in sequence according to the frequency of an input signal, and therefore the rotor is driven to rotate effectively. The relatively independently acting drive teeth make the operation of the motor more stable.
An integrated mounting disc 6 is arranged on the rotating shaft 1 and used for fixing the rotor. The first rotor 4 and the second rotor 5 are symmetrically arranged on the mounting disc 6, and the first stator 2 and the second stator 3 are symmetrically arranged on the rotating shaft 1. The two rotors and the two stators are symmetrically arranged on the rotating shaft 1, so that the motor is more stable in operation; and when the input signals of the two stators are completely consistent, the two stators can synchronously act on the rotor so as to maximize the rotating speed of the motor.
The motor further comprises a housing 7, a first base 8 and a second base 9. The first stator 2 is mounted on a first base 8 and the second stator 3 is mounted on a second base 9 to protect the stators. The first base 8 and the second base 9 are distributed on two sides of the shell 7.
A speed control method of an ultrasonic motor transmits a first frequency signal to a first stator 2 so as to enable the motor to obtain an initial speed; the second frequency signal is fed to the second stator 3 to make the motor obtain the first speed. And controlling the rotating speed of the motor according to the signal characteristic of the second frequency signal relative to the first frequency signal. According to the asynchronism of the double-stator double-rotor motor, the motor runs at an initial speed and then is superposed with a first speed, so that the rotating speed of the motor is higher. In addition, the rotating speed of the motor is changed by changing the signal characteristic of the second frequency signal of the motor relative to the first frequency signal, so that the response speed of the motor is higher, and the requirement of the high-pressure injector is met more effectively.
The signal characteristic of this embodiment is the phase difference of the second frequency signal relative to the first frequency signal, and the rotation speed of the motor is changed according to the phase difference of the second frequency signal relative to the first frequency signal. The phase difference of the second frequency signal relative to the first frequency signal is adjusted, so that the two rotors are asynchronous at once, the speed of the rotors is reduced, and the response speed of the stepping motor is higher and more stable than the speed regulation of the conventional stepping motor. Specifically, the second frequency signal is supplied to the second stator 3 through the phase adjuster. When the phase adjuster is closed, the motor is operated only by the first frequency signal, i.e. at the initial speed. When the phase adjuster is started, the rotating speed of the motor is superposed with the first speed on the basis of the initial speed, the rotating speed of the motor is greater than the initial speed, and when the phases of the second frequency signal relative to the first frequency signal are consistent, the motor is enabled to run synchronously, and the rotating speed of the motor is the maximum at the moment; when the phase difference of the second frequency signal relative to the first frequency signal occurs, the motor immediately generates asynchronous operation, at the moment, although the rotating speed of the motor is greater than the initial speed, the rotating speed of the motor under the asynchronous operation is smaller than that of the motor under the synchronous operation, and therefore the rotating speed of the motor can be adjusted by adjusting the phase of the second frequency signal relative to the first frequency signal.
The first frequency signal and the second frequency signal are PWM signals, so that the driving teeth on the stator are sequentially jumped to drive the rotor to rotate. The frequencies of the first frequency signal and the second frequency signal are consistent, so that the motor can run more stably.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the structure of the invention, which will not affect the effect of the invention and the practicability of the patent.
Claims (8)
1. The utility model provides an ultrasonic motor, includes pivot (1), its characterized in that still includes first stator (2) and second stator (3), install first rotor (4) and second rotor (5) on pivot (1), first stator (2) rotate with pivot (1) and are connected, just first stator (2) are located the outside of first rotor (4), second stator (3) rotate with pivot (1) and are connected, just second stator (3) are located the outside of second rotor (5).
2. An ultrasonic motor according to claim 1, characterized in that the first stator (2) and the second stator (3) are piezo-ceramic stators.
3. An ultrasonic motor according to claim 2, characterized in that the first stator (2) comprises a plurality of first drive teeth (21), the end faces of the first drive teeth (21) being arranged opposite the outer side face of the first rotor (4), and the second stator (3) comprises a plurality of second drive teeth (31), the end faces of the second drive teeth (31) being arranged opposite the outer side face of the second rotor (5).
4. An ultrasonic motor according to claim 1, wherein the rotating shaft (1) is provided with an integrated mounting plate (6), the first rotor (4) and the second rotor (5) are symmetrically mounted on the mounting plate (6), and the first stator (2) and the second stator (3) are symmetrically arranged on the rotating shaft (1).
5. An ultrasonic motor according to claim 1, further comprising a housing (7), a first base (8) and a second base (9), wherein the first stator (2) is mounted on the first base (8), the second stator (3) is mounted on the second base (9), and the first base (8) and the second base (9) are distributed on two sides of the housing (7).
6. A method of speed control of an ultrasonic motor according to any of claims 1-5, characterized in that a first frequency signal is fed to the first stator (2) to obtain an initial speed of the motor; -delivering a second frequency signal to a second stator (3) to cause the motor to obtain a first speed; and controlling the rotating speed of the motor according to the signal characteristic of the second frequency signal relative to the first frequency signal.
7. The method as claimed in claim 1, wherein the signal characteristic is a phase difference of the second frequency signal with respect to the first frequency signal, and the rotational speed of the motor is changed according to the phase difference of the second frequency signal with respect to the first frequency signal.
8. The method as claimed in claim 6 or 7, wherein the first frequency signal and the second frequency signal are both PWM signals, and the frequencies of the first frequency signal and the second frequency signal are both identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911352395.0A CN111010049A (en) | 2019-12-25 | 2019-12-25 | Ultrasonic motor and speed control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911352395.0A CN111010049A (en) | 2019-12-25 | 2019-12-25 | Ultrasonic motor and speed control method thereof |
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| Publication Number | Publication Date |
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| CN111010049A true CN111010049A (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911352395.0A Pending CN111010049A (en) | 2019-12-25 | 2019-12-25 | Ultrasonic motor and speed control method thereof |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206775411U (en) * | 2017-05-31 | 2017-12-19 | 江苏紫金东方超声电机有限公司 | One kind is exempted to adjust the coaxial double stators and double rotors plate-like travelling wave supersonic motor of gap |
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2019
- 2019-12-25 CN CN201911352395.0A patent/CN111010049A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206775411U (en) * | 2017-05-31 | 2017-12-19 | 江苏紫金东方超声电机有限公司 | One kind is exempted to adjust the coaxial double stators and double rotors plate-like travelling wave supersonic motor of gap |
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Application publication date: 20200414 |