Technosoft IDM240-5EI - Stepper Motor Open-Loop Control. no Feedback Device; Stepper Motor Open-Loop Control. Incremental Encoder on Load

© Technosoft 2011 80 IDMx40 Technical Reference
]IU[Speed_Motor
Trgain_Tacho
Range_Input_uelogAna
]SI[Speed_Load ×
××
=
4096
where:
Analogue_Input_Range – is the range of the drive analogue input for feedback, expressed in [V].
You can read this value in the “Drive Info” dialogue, which can be opened from the “Drive Setup”
Tacho_gain – is the tachometer gain expressed in [V/rad/s]
6.2.4. Stepper motor open-loop control. No feedback device
The internal speed units are motor µsteps / (slow loop sampling period). The correspondence with
the load speed in SI units
is:
]IU[Speed_Motor
TTrsteps_Nosteps_No
]SI[Speed_Load ×
×××μ
π×
=
2
where:
No_steps – is the number of motor steps per revolution
No_µsteps – is the number of microsteps per step. You can read/change this value in the
“Drive Setup” dialogue from EasySetUp.
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”
6.2.5. Stepper motor open-loop control. Incremental encoder on load
The internal speed units are load encoder counts / (slow loop sampling period). The transmission
is rotary-to-rotary. The correspondence with the load speed in SI units is:
]IU[Speed_Load
Tlines_encoder_No
]s/rad[Speed_Load ×
××
π×
=
4
2
where:
No_encoder_lines – is the rotary encoder number of lines per revolution
Tr – transmission ratio between the motor displacement in [rad] and load displacement in
[rad] or [m]
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”.