Electrodynamometer Movement

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METER MOVEMENTS Test Instruments & Measuring Devices A  common  variation  of  the  D’Arsonval  movement  is  the  Weston  movement,  which  uses essentially the same principle built to a more rugged construction by employing jeweled supports for  the  core  and  employing  a  heavier  winding  in  the  electromagnet.  Remember  that  the D’Arsonval movement is a DC device and can only measure DC current or AC current rectified to DC. Electrodynamometer Movement The  electrodynamometer  movement  (Figure  2)  has  the  same  basic  operating  principle  as  the D’Arsonval meter movement, except that the permanent magnet is replaced by fixed coils.   The moving coil and pointer, which are attached to the coil, are suspended between and connected in series with the two field coils.   The two field coils and moving coil are connected in series such that the same current flows through each coil. Figure 2    Electrodynamometer Movement Current flow through the three coils in either direction causes a magnetic field to be produced between  the  field  coils.   The  same  current  flow  through  the  moving  coil  causes  it  to  act  as  a magnet exerting a force against the spring.   If the current is reversed, the field polarity and the polarity of the moving coil reverse, and the force continues in the same direction.   Due to this characteristic of the electrodynamometer movement, it can be used in both AC and DC systems to measure current.   Some voltmeters and ammeters use the electrodynamometer.   However, its most important use is in the wattmeter, which will be discussed later in this module. ES-14 Page 2 Rev. 0


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