High-speed rotating ultrasonic motor and electric excitation method of stator of high-speed rotating ultrasonic motor

An ultrasonic motor, high-speed rotation technology, applied in the direction of generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, etc., to achieve the effects of non-destructive, simple structure, and increased output speed

Active Publication Date: 2016-12-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

A search of existing ultrasonic motor patents found that there are very few small high-speed ultrasonic motors used as actuators on micro-aircraft

Method used

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  • High-speed rotating ultrasonic motor and electric excitation method of stator of high-speed rotating ultrasonic motor
  • High-speed rotating ultrasonic motor and electric excitation method of stator of high-speed rotating ultrasonic motor
  • High-speed rotating ultrasonic motor and electric excitation method of stator of high-speed rotating ultrasonic motor

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing.

[0021] Overall structure of the present invention is as image 3 As shown, including the stator and the rotor, the stator is as figure 1 As shown, it includes a metal disc 2 and a carbon fiber tube 1 passing through the center of the metal disc 2. Four piezoelectric ceramics 8 are fixed on the bottom surface of the metal disc. The first piezoelectric ceramic and the third piezoelectric ceramic at the diagonal position The positive polarization areas of the piezoelectric ceramics are arranged in a semicircle upwards to form phase A, and the second piezoelectric ceramics and the fourth piezoelectric ceramics in the diagonal position are arranged in a semicircle upwards to form phase B, and the phases A and The external excitation signal connected to phase B is a sinusoidal signal with a phase difference of π / 2; the rotor and stator are assembled as follows figure 2 As show...

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Abstract

The invention provides a high-speed rotating ultrasonic motor and an electric excitation method of a stator of the high-speed rotating ultrasonic motor. A stator main body of the motor comprises a metal disk and a carbon fiber tube; the stator comprises the metal disk, the carbon fiber tube and piezoelectric ceramics; four ceramic wafers are used for exciting two out-of-plane bending working modes, of which the space phase difference is pi / 2, of the lower end surface of the stator; and two paths of sine signals of which the time phase difference is pi / 2 are utilized for simultaneously exciting two orthogonal working modes, so that elliptic motion is generated on inner bevels of two ends of the carbon fiber tube; and the rotor is pushed to move through a friction effect. The ultrasonic motor has the characteristics of being simple in structure, high in rotating speed, light in quality and the like, and a bearing is not needed.

Description

technical field [0001] The invention relates to the field of ultrasonic motors, in particular to an electric excitation method for a high-speed rotating ultrasonic motor and its stator. Background technique [0002] The ultrasonic motor is a new type of actuator that uses the inverse piezoelectric effect of piezoelectric ceramics to excite ultrasonic vibrations and is driven by friction. The rotary ultrasonic motor is a type of ultrasonic motor. Compared with traditional electromagnetic motors, ultrasonic motors have the advantages of large torque-to-mass ratio, fast response, precise positioning, and no electromagnetic interference. They have broad application prospects in the fields of biomedicine, precision drives, optical devices, and aerospace. A search of existing ultrasonic motor patents reveals that there are very few small high-speed ultrasonic motors used as actuators on micro-aircraft. Contents of the invention [0003] In order to solve the problems of the pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/12H02N2/16
CPCH02N2/12H02N2/166
Inventor 芦小龙王乐赵淳生薛成吴树雄王福飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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