Noise Depressed in a Micro Stepping Motor

An investigation of noise in a micro stepping motor is considered to study in this article. Because of the trend towards higher precision and more and more small 3C (including Computer, Communication and Consumer Electronics) products, the micro stepping motor is frequently used to drive the micro system or the other 3C products. Unfortunately, noise in a micro stepped motor is too large to accept by the customs. To depress the noise of a micro stepped motor, the dynamic characteristics in this system must be studied. In this article, a Visual Basic (VB) computer program speed controlled micro stepped motor in a digital camera is investigated. Karman KD2300-2S non-contract eddy current displacement sensor, probe microphone, and HP 35670A analyzer are employed to analyze the dynamic characteristics of vibration and noise in a motor. The vibration and noise measurement of different type of bearings and different treatment of coils are compared. The rotating components, bearings, coil, etc. of the motor play the important roles in producing vibration and noise. It is found that the noise will be depressed about 3~4 dB and 6~7 dB, when substitutes the copper bearing with plastic one and coats the motor coil with paraffin wax, respectively.

Authors:

• Bo-Wun Huang
• Jao-Hwa Kuang
• J.-G. Tseng
• Yan-De Wu

Keywords:

• micro motor
• noise
• vibration

References:

[1] Trimmer W, Gabriel KL. Design consideration for a practical electrostatic
micromotor. Sensors and Actuators 1987; 11: 189-206.
[2] Dhuler VR, Mehregany M, M.Phillips S. A comparative study for
harmonic side-drive micromotor. IEEE Trans Electron Devices 1993; 40:
1985-9.
[3] Trimmer W, Jebens R. Harmonic electrostatic motor. Sensors and
Actuators 1989; 20: 17-24.
[4] Muller RS. Microdynamics. Sensors and Actuators A 1990; 21-23: 1-8.
[5] Bart SF, Mehregany M, Tavrow LS, Lang JH, Senturia SD. Electric
micromotor dynamics. IEEE Transactions on Electron Devices 1992;
39(3): 566-75.
[6] Pelikant A, Wiak S, Komeza K. Computer simulation of dynamic states
of the silicon micromotor. Int J. Comput Math Elect Electron Eng 1998;
7: 307-12.
[7] Endemano A, Fourniols JY, Camon H, Marchese A. VHDLÔÇöAMS
modelling and simulation of a planar electrostatic micromotor. J
Micromech Microeng 2003; 13: 580-90.
[8] Dufour I, Sarraute ES, Abbas A. Optimization of the geometry of
electrostatic micromotors using only analytical equations. J Micromech
Microeng 1996; 6: 108-11.
[9] Sangster AJ, Samper VD. Accuracy assessment of 2-D and 3-D
finite-element models of a double-stator electrostatic wobble motor. J
Micromech Microeng 1997; 6: 142-50.
[10] Tai YC, Muller RS. Frictional study of IC-processed micromotor. Sensors
and Actuators 1990; 21: 180-3.
[11] Beerschwinger U, Milne NG, Yang SJ, Reuben RL, Sangster AJ, Ziad H.
Coupled electrostatic and mechanical FEA of a micromotor. J
Microelectromech Syst 1994; 3: 162-71.
[12] Beerschwinger U, Reuben RL, Yang SJ. Frictional study of micromotor
bearings. Sensors and Actuators A 1997; 63: 229-41.
[13] Chu X, Xing Z, Gong W, Li L, Gui Z. Vibration analysis of stepping
piezoelectric micro-motor using wiggle mode. Materials Science and
Engineering B 2003; 99(1-3): 306-8.
[14] Ishikawa T, Takakusagi R, Matsunami M, Static Torque Characteristics
of Permanent Magnet Type Stepping Motor with Claw Poles," IEEE
Trans. on Magnetics 2000; 36 (N4): 1854-7.
[15] Kawase Y, Takehara A. 3-D Dynamic Step Response Analysis of
Claw-poled Stepping Motors by Finite Element Method. Digest of IEEE
CEFC-98, 1998; 214.
[16] Liu CP, Li YC, Liu KH, Wu KT, Yao YD. Analysis of the performance of
permanent magnetic stepping motor with trapezoid stator tooth. J. Appl.
Phys 2006; 99: 08R316.
[17] Zaman MT, Kumar AS, Rahman M, Sreeram S. A three-dimensional
analytical cutting force model for micro end milling operation.
International Journal of Machine Tools & Manufacture 2006; 46:
353-66.
[18] Michael PV, Shiv GK, Richard ED. On the modeling and analysis of
machining performance in micro-endmilling, part II: cutting force
prediction. ASME, Journal of Manufacturing Science and Engineering,
2004; 126: 695-705.
[19] Chae J, Park SS, Freiheit T. Investigation of micro-cutting operations.
International Journal of Machine Tools & Manufacture 2006; 46:
313-32.
[20] Kim CJ, Mayor JR, Ni J. A Static Model of Chip Formation in Microscale
Milling. ASME, Journal of Manufacturing Science and Engineering
2004; 126:710-8.
[21] Tansel IN, Arkan TT, Bao WY, Mahendrakar N, Shisler B. Tool wear
estimation in micro-machining. part I: tool usage-cutting force
relationship. International Journal of Machine Tools & Manufacture,
2000; 46: 313-32.