VID 29 documentation - Guy Carpenter

See also our application note AN230405
Torque value (uNm)
AN210905
1) During the reset the torque of the motor as to be lower as possible
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
Average Tor que
100Hz 150Hz 200Hz 250Hz 300Hz 350Hz 400Hz 450Hz 500Hz 550Hz 600Hz
Fr equency
Is necessary to work with a pointer speed between 450 and 550 deg/sec
2) The acceleration to reach this speed depends from the inertia of the
pointer.
3) Example and method to calculate the acceleration.
Remarks:
- 1 Hz = 1 deg/sec of the pointer = 180 deg/sec of the rotor
Suppose a pointer inertia of 5*E-7 Kgm2
a) Start stop frequency
The maximum start-stop frequency is:
205 Hz (205 deg/sec of pointer)

For security we will chose 170 Hz. So the pointer can start to move at 190
deg/sec.
b) Rotation speed steps

A pointer with inertia of 5*E-7 Kgm2 can be accelerate
c) Time of acceleration
FROM TO
190 deg/sec 290 deg/sec
290 deg/sec 360 deg/sec
360 deg/sec 420 deg/sec
420 deg/sec 470 deg/sec
470 deg/sec 500 deg/sec
500 deg/sec 530 deg/sec
530 deg/sec 560 deg/sec
How long the pointer as to be accelerate for each steps
FROM TO Time [msec]
190 deg/sec 290 deg/sec 3.3
290 deg/sec 360 deg/sec 2.9
360 deg/sec 420 deg/sec 2.6
420 deg/sec 470 deg/sec 2.5
470 deg/sec 500 deg/sec 2.2
500 deg/sec 530 deg/sec 2
530 deg/sec 560 deg/sec 2

100000
80000
60000
40000
20000
Speed of
rotor
deg/sec
500
400
300
200
100
REMARKS:
Speed of
pointer
deg/sec
5 10
1000
Acceleration phase
Start-stop frequency
15
3000
20
25
Final speed
10 20 30 40
Time [m sec]
30
4000 6000
- The visible jitter of pointer during bumping on the stop is also influenced
by the design and the material of the pointer. It is necessary to adjust the
final speed (final rotation frequency) by experimental test in order to
minimize this phenomenon.
Angle of pointer
Angle of rotor