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S120降低电机噪音的新方法:Pulse Frequency Wobbling

2012-01-30 17:35阅读:
电机的工作噪音是不可避免的,在使用驱动器拖动电机时,噪音更加明显。电机的工作噪音是由于电机内部定子、转子、轴承、绕组、空气在电磁场中振动造成的,负载越重,工作电流就越大,噪音就越大。
要降低电机的工作噪音,在排除机械问题以后,可以在电气采取一下措施来降低噪音。电气上常用的方法是优化控制器参数,屏蔽共振频率,提高开关频率等。如果在采用了这些方法以后,还不理想,那么可以考虑使用这个摆频功能。
摆频是SINAMICS S120变频器新一代装机装柜型Chassis模块新增加的功能。新一代Chassis模块的使用控制接口模块CIM+IPD取代原来的CIB+PSB,同时带来了一些新功能。摆频功能就是这些新功能之一。这种使用CIM的Chassis模块订货号末位为3。
摆频功能可以通过参数P1810.2激活,P1811设置摆动幅值(比如5%)。激活摆频功能后,电机噪音可以进一步减小。
我就不给大家翻译了,原来描述如下:
Description
The function is available for Motor Modules in chassis format with DRIVE-CLiQ (order
numbers: 6SL3xxx-xxxxx-xxx3) available in the vector control mode.
Pulse frequency wobbling damps the spectral components, which can generate unwanted
noise in the motor. Wobbling can be activated only for pulse frequencies that are lower than
or equal to the current controller frequency (see also p0115[0]).
Wobbling causes the p
ulse frequency in a modulation interval to deviate from the setpoint
frequency. This means that the actual pulse frequency might be higher than the average
pulse frequency required.
A noise generator can be used to vary the pulse frequency around an average value. In this
case, the average pulse frequency is equal to the setpoint pulse frequency. The pulse
frequency can be varied in every current controller cycle if the cycle is constant. Current
measurement errors resulting from asynchronous pulse and control intervals are
compensated by a correction in the actual current value.
Pulse frequency wobbling can be parameterized with parameter p1810 'Modulator
configuration'.


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