Ultrasound electrical motor, and driving method

A technology of ultrasonic motor and driving method, which is applied in the directions of generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, etc. problem, to achieve the effect of less high-order harmonics, less harmonic interference, and saving switching devices

Inactive Publication Date: 2006-12-06
BOLY MEDIA COMM SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an ultrasonic motor with high stability and its driving method, so as to solve the problem that the output torque of the motor fluctuates and the high-order harmonics are large when a two-phase orthogonal power supply is used in the prior art

Method used

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  • Ultrasound electrical motor, and driving method
  • Ultrasound electrical motor, and driving method
  • Ultrasound electrical motor, and driving method

Examples

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Effect test

Embodiment 1

[0035] according to figure 1 As shown, the present invention includes a motor body 1, and the motor body 1 includes a rotor and a stator, such as figure 1 and figure 2 As shown, the stator includes a cylindrical piezoelectric ceramic tube 121, an end pressure piece 122 and a piezoelectric element 120, the piezoelectric ceramic tube 121 and the end pressure piece 122 are connected, and the piezoelectric element 120 is pasted outside the piezoelectric ceramic tube 121 On the surface, the rotor includes a rotating block 111, a rotating shaft 112, a nut 113 and a spring 114. The rotating shaft 112 passes through the stator. The two rotating blocks 111 are connected to the rotating shaft 112 and clamped on both sides of the stator. side, the inner side of which presses against the spring 114 , and the spring 114 is sleeved on the rotating shaft 112 .

[0036] Such as figure 2 and image 3 As shown, the piezoelectric element 120 is a piezoelectric ceramic sheet, and the number...

Embodiment 2

[0047] Such as Figure 6 As shown, the difference between this embodiment and Embodiment 1 is: in this embodiment, the piezoelectric ceramic tube 121 is a regular hexagonal prism type, which can be metal or non-metallic material, as for other parts of the structure, and related driving process and implementation The same or similar as described in Example 1, and will not be repeated here.

Embodiment 3

[0049] according to Figure 7 and Figure 8, the main difference between this embodiment and Embodiments 1 and 2 is: in this embodiment, the multi-phase power supply is a power supply with 5-phase phase difference of 72°, and its five-phase terminals are respectively U, V, W, S, T , the number of piezoelectric elements 120 is twice the number of 5, that is, 10. As for other parts of the structure, and the relevant driving process is the same or similar to that described in Embodiment 1 or Embodiment 2, and will not be repeated here.

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Abstract

The ultrasound motor includes main body, and rotor and stator inside the main body. Piezoelectric elements are pasted on stator. Characters are that number of piezoelectric element is m or integral time of number m, where as prime number larger than 2; amount of piezoelectric element is 3 or integral time of 3; piezoelectric elements are evenly distributed on stator; direction of polarization of piezoelectric element is consistent to pasted surface relatively. The method includes steps: (1) obtaining polyphase source including M phases, and phase difference as 2Pi / M, and M as integer large than 2; (2) applying voltage in each phase on corresponding piezoelectric element in ultrasound motor. The output of power supply in three phases is AC sinusoidal voltage in 120 degrees of phase difference, AC square wave voltage, or modulated AC pulse voltage in mode of pulse width modulation. Features are: stable output moment, and small harmonic interference.

Description

technical field [0001] The invention relates to a motor, in particular to an ultrasonic motor and a driving method thereof. Background technique [0002] The ultrasonic motor is a driving mechanism made of a specific structure using the inverse piezoelectric effect of piezoelectric materials. It is generally composed of functional components such as a stator and a rotor. Usually, a piezoelectric element with an electrostrictive effect is fixed on the stator. Existing ultrasonic motors are generally equipped with four (or integer multiples) of piezoelectric elements, which are driven by a two-phase orthogonal power supply. In practical applications, the two-phase orthogonal power supply is mostly obtained by DC through inversion. The two-way power supply requires two sets of single-phase full-bridge circuits, and a total of eight switching devices are required. The output torque of this two-phase orthogonal power supply is not balanced enough, and the high-order harmonics gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/00H02N2/10H02N2/12H02N2/14
CPCH02N2/147H02N2/16
Inventor 李毅周松河
Owner BOLY MEDIA COMM SHENZHEN
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