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Geo Brick Drive User Manual
Motor Setup
199
Commutation Position Address, Commutation Enable: Ixx83, Ixx01
Digital Quadrature Feedback (Default)
I483=$078019
; Motor #4 On-going Commutation Position Address
I401=1
; Motor #4 Commutation Enabled, from X-register
Note
AC Induction Motors are not generally used for (high precision)
positioning; it is assumed that a quadrature feedback type device is
being used. For setting up other feedback devices, the commutation
position address (Ixx83) would have to change. Contact Technical
Support for help with these special cases.
Magnetization Current, Slip Gain: Ixx77
The quadrature current is much smaller than the direct current with AC induction motors therefore the
magnetization current, Ixx77, can be estimated using the no load current at a specified voltage:
#define Ch4MaxADC
26.02 ; =26.02 for 8/16A, see electrical specs of the drive
-User Input
#define Ch4MaxOutput P7004 ; Channel 4 Maximum Command Output
#define Mtr4EstMagCur P7005 ; Motor #4 Estimated Magnetization current [16-bit DAC]
Ch4MaxOutput=32767*SQRT(3)/2
Mtr4EstMagCur= Mtr4NoLoadCur*ACBusVoltage/Mtr4Voltage
I477=Mtr4EstMagCur*Ch4MaxOutput*SQRT(2)/Ch4MaxADC
; Initial Guess
Motor Slip Gain: Ixx78
Ixx78 controls the relationship between the torque command and the slip frequency of the magnetic field
on the rotor of an AC Induction (Asynchronous) motor. While it is usually set experimentally, The Motor
Slip Gain Ixx78 can be calculated from either the motor name plate, or the rotor time constant.
Calculating Slip Gain From Name Plate Data:
#define We
P7006 ; Electrical Frequency, in Radians/Sec
#define Wm
P7007 ; Rated mechanical pole frequency, in radians/sec
#define Tp
P7008 ; Phase Clock, in Seconds
#define PI
3.1416 ; PI Constant
Tp=1/(PhaseClk*1000)
; PhaseClk is defined in clock calculation section
We=LineFrequency*2*PI
;
Wm=(Mtr4Speed*2*PI*Mtr4Poles)/(60*2) ;
I478=(We-Wm)*Tp*I477/32768
; Motor #4 Slip Gain Constant
Note
Using the name plate information to calculate the slip gain requires an
initial estimation of the magnetization current Ixx77. If the
magnetization current is changed, as explained in a subsequent step,
the slip gain needs to be adjusted accordingly.
Calculating Slip Gain From Rotor Time Constant. Example:
#define Tp
P7008 ; Phase Clock, in Seconds
Tp =1/(PhaseClk*1000) ; PhaseClk is defined in clock calculation section
I478= Tp/Mtr4TimeCst ; Motor #4 Slip Gain Constant
Содержание Geo Brick
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Страница 286: ...Geo Brick Drive User Manual Appendix A 286 APPENDIX A Schematic Samples Watchdog X15 Inputs J6 J7...
Страница 287: ...Geo Brick Drive User Manual Appendix A 287 Outputs J6 J7 603793 109 and earlier Outputs J6 J7 603793 10A and later...
Страница 288: ...Geo Brick Drive User Manual Appendix A 288 Limits Flags J4...