Vibration in Electric Motors

Contacting the manufacturer is the only reliable way to find out. If you have got vibration I would suggest you do so quickly.

Its a blunt question, without giving the size/capacity or type of foundation or balancing quality which are necessary to determine allowable vibration. So I shall answer assuming for the most likely.

A motor below 300 W capacity with rigid foundation can have acceptable vibration value up to 4.5 mm/s. However, for new motors it is advised to be under 1.8 mm/s.

Refer ISO 10816 for pedestal vibration and ISO 7919 for shaft vibration depending on requirement to find applicable limits.

Please refer to Table-1 of IS 12075

Pl. provide the table - 1 of IS 12075. WE ALL WILL BE BENIFITTED.

tHANKS,

RAJESWARI.

IS 12075 is available in the following link. You can download it for free

http://www.ziddu.com/download/11358867/3...5.pdf.html

sharath

Refer to IEC 60034-14: "Mechanical vibration of certain machines with shaft heights 56 mm and higher - Measurement, evaluation and limits of vibration", Section 8.1, Table 1

The allowable vibration depends on the motor mounting condition and the shaft height:

For the rigid mounted case, the allowable limit is 2.8 mm/s

For the free suspension case, the allowable limit is 1.8 mm/s for shaft height 56 mm to 132 mm, 2.8 mm/s for shaft height 132 mm to 225 mm and 3.5 mm/s for shaft height greater than 225 mm

- MS

Article for Vibration analysis and remedy: click here

http://www.brighthub.com/engineering/electrical/articles/122952.aspx

Dear Mr. electricaleng:

Thank you for your reply and guidance.

Very useful and educating link.

rajeswari.