Technosoft iPOS4808 MX Series, Technical Reference

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Technosoft 2014 97 iPOS4808 MX Technical Reference
Tr
–
transmission ratio between the motor displacement in SI units and load displacement in SI
units
T
– is the slow loop sampling period expressed in [s]. You can read this value in the “Advanced”
dialogue, which can be opened from
the “Drive Setup”
6.3.2. Brushless motor with linear Hall signals
The internal acceleration units are counts / (slow loop sampling period)
2
. The motor is rotary. The
position resolution i.e. number of counts per revolution is programmable as a power of 2 between
512 and 8192. By default it is set at 2048 counts per turn. The correspondence with the load
acceleration in SI units
1
is:
For rotary motors:
] IU [ on Accelerati _ Motor
T Tr resolution
] SI [ on Accelerati _ Load

 
 

2
2
For linear motors:
2
Pole_Pitch
Load_Acceleration[SI] = ×Motor_Acceleration[IU]
resolution×Tr ×T
where:
resolution
–
is the motor position resolution
Tr
–
transmission ratio between the motor displacement in SI units and load displacement in SI
units
T
– is the slow loop sampling period expressed in [s]. You can read this value in the “Advanced”
dialogue, which can be opened from the “Drive Setup”
Pole_Pitch
–
is the magnetic pole pitch NN (distance expressed in [m])
6.3.3. DC brushed motor with quadrature encoder on load and tacho on motor
The internal acceleration units are encoder counts / (slow loop sampling period)
2
. The motor is
rotary and the transmission is rotary-to-rotary. The correspondence with the load acceleration in SI
units is:
] IU [ on Accelerati _ Load
T lines _ encoder _ No
] SI [ on Accelerati _ Load

 
 

2
4
2
where:
No_encoder_lines
–
is the encoder number of lines per revolution
1
SI units for acceleration are [rad/s
2
] for a rotary movement, [m/s
2
] for a linear movement