High dynamic range torque control - Revision history

Tero K at 12:11, 15 September 2014

2014-09-15T12:11:37Z

Tero K at 12:10, 15 September 2014

2014-09-15T12:10:09Z

Tero K: /* Contributions */

2013-10-03T23:59:33Z

‎Contributions

Tero K at 23:52, 13 June 2013

2013-06-13T23:52:35Z

Tero K at 20:53, 13 June 2013

2013-06-13T20:53:46Z

Tero K: /* Applications */

2013-06-13T20:53:25Z

‎Applications

Tero K at 20:53, 13 June 2013

2013-06-13T20:53:00Z

Tero K at 20:52, 13 June 2013

2013-06-13T20:52:41Z

Tero K at 20:52, 13 June 2013

2013-06-13T20:52:22Z

Tero K at 20:51, 13 June 2013

2013-06-13T20:51:15Z

@@ Line 13: / Line 13: @@
 One major motivator behind HDRT is to expand the range of motors that can be driven with single drive without exhibiting any of the typical drawbacks that come when a small motor is being driven with a large drive (motor hiss, jitter, torque ripple, position hunting). It also gives maximum precision for those who want the best performance in torque control mode.
-<gallery widths="450px" heights="450px">
+<gallery widths="450px" heights="360px">
 File:Hdrtboth annotated.png|Illustration of measured current signals from ION. Each phase current is measured in two channels: with high sensitivity and low sensitivity. The high sensitivity signal has higher precision but is limited to about +/-3.5A range. The low sensitivity signal has range of +/-23A but comes with less precision. The drive combines these two signals into one by making it both precise and high dynamic range.
 File:Hdrtcombm.png|Zoomed image of the combined current sense signal. The switch between high and low sensitivity happens at 2.5A. As seen from the image, the curve above 2.5A is bit more rough than below 2.5A.

@@ Line 1: / Line 1: @@
-[[File:Noise1.gif|450px|thumb|All measured signals differ more or less from the true physical value (general example image). HDRT aims to minimize error and noise of measured motor phase currents by adjusting current sensor sensitivity by the means of a low noise amplifier prior to analog-to-digital conversion.]]
+[[File:Noise1.gif|350px|thumb|All measured signals differ more or less from the true physical value (general example image). HDRT aims to minimize error and noise of measured motor phase currents by adjusting current sensor sensitivity by the means of a low noise amplifier prior to analog-to-digital conversion.]]
 '''Torque control''' is the most important single instrument present in modern motor drives. All operations drive does, are handled finally by a torque controller - even if motor is being operated in velocity or positioning modes.
-High dynamic range torque control a.k.a. '''HDRT''' is a torque control technology built in [[VSD-E and VSD-XE|VSD-E/XE series]] and [[Argon (servo drive)|Argon servo drive series]]. HDRT yields approximately 14 bits of torque resolution which is 16 times higher compared to standard 10 bit torque resolution found from an average drive. HDRT has been implemented by using on-the-fly adjusting current sensor gain control combined with low noise electronics and at least 16 bit digital signal path inside the drive.
+High dynamic range torque control a.k.a. '''HDRT''' is a torque control technology built in [[VSD-E and VSD-XE|VSD-E/XE series]], [[Argon (servo drive)|Argon servo drive series]] as well as ION drive series. HDRT yields approximately 14 bits of torque resolution which is 16 times higher compared to standard 10 bit torque resolution found from an average drive. HDRT has been implemented by using on-the-fly adjusting current sensor gain control combined with low noise electronics and at least 16 bit digital signal path inside the drive.
-==Contributions==
+===Contributions===
 *Smoother, less jittering motion when combined with high resolution [[Feedback devices|feedback]]
 *Quieter operation, reduced noise from motor
 *Allow supporting wide power range of motors within single drive
 *All automatic & transparent - no configuration needed
 [[Category:Technology]]
 [[Category:Glossary]]

@@ Line 7: / Line 7: @@
 *Quieter operation, reduced noise from motor
 *Allow supporting wide power range of motors within single drive
 [[Category:Technology]]
 [[Category:Glossary]]

@@ Line 3: / Line 3: @@
 High dynamic range torque control a.k.a. '''HDRT''' is a torque control technology built in [[VSD-E and VSD-XE|VSD-E/XE series]] and [[Argon (servo drive)|Argon servo drive series]]. HDRT yields approximately 14 bits of torque resolution which is 16 times higher compared to standard 10 bit torque resolution found from an average drive. HDRT has been implemented by using on-the-fly adjusting current sensor gain control combined with low noise electronics and at least 16 bit digital signal path inside the drive.
-==Applications==
+==Contributions==
-HDRT helps following ways:
 *Smoother, less jittering motion when combined with high resolution [[Feedback devices|feedback]]
 *Quieter operation, reduced noise from motor

@@ Line 6: / Line 6: @@
 HDRT helps following ways:
 *Smoother, less jittering motion when combined with high resolution [[Feedback devices|feedback]]
-*Quieter operation, no hiss from motor
+*Quieter operation, reduced noise from motor
 *Allow supporting wide power range of motors within single drive
 [[Category:Technology]]
 [[Category:Glossary]]

@@ Line 5: / Line 5: @@
 ==Applications==
 HDRT helps following ways:
-*Smoother, less jittering motion with high resolution feedback
+*Smoother, less jittering motion when combined with high resolution feedback
 *Quiet operation, no hiss from motor
 *Allow supporting wide power range of motors within single drive