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L6480 bảng dữ liệu(PDF) 37 Page - STMicroelectronics

tên linh kiện L6480
Giải thích chi tiết về linh kiện  The L6480, realized in analog mixed signal technology, is an advanced fully integrated solution suitable for driving two-phase bipolar stepper motors with microstepping.
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6480 bảng dữ liệu(HTML) 37 Page - STMicroelectronics

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L6480
Phase current control
Doc ID 023278 Rev 3
37/73
Figure 16.
Current distortion and compensation
The optimization can be enabled setting high the LSPD_OPT bit in the MIN_SPEED register
(Section 9.1.8) and is active in a speed range from zero to MIN_SPEED. When low speed
optimization is enabled, speed profile minimum speed is forced to zero.
7.4
BEMF compensation
Using the speed information, a compensation curve is added to the amplitude of the voltage
waveform applied to the motor winding in order to compensate the BEMF variations during
acceleration and deceleration (see Figure 17).
The compensation curve is approximated by a stacked line with a starting slope (ST_SLP)
when speed is lower than a programmable threshold speed (INT_SPEED) and a fine slope
(FN_SLP_ACC and FN_SLP_DEC) when speed is greater than the threshold speed (see
sections 9.1.11, 9.1.12, 9.1.13 and 9.1.14).



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