參數(shù)資料
型號(hào): L6470HTR
廠(chǎng)商: STMICROELECTRONICS
元件分類(lèi): 運(yùn)動(dòng)控制電子
英文描述: STEPPER MOTOR CONTROLLER, 7 A, PDSO28
封裝: ROHS COMPLIANT, HTSSOP-28
文件頁(yè)數(shù): 25/64頁(yè)
文件大?。?/td> 814K
代理商: L6470HTR
L6470
Phase current control
Doc ID 16737 Rev 2
31/64
7.2
Sensorless stall detection
Depending on motor speed and load angle characteristics, L6470 offers a motor stall
condition detection using a programmable current comparator.
When a stall event occurs, the respective flag (STEP_LOSS_A or STEP_LOSS_B) is forced
low until a GetStaus command or a system reset occurs (see paragraph 9.2.20).
7.3
Low speed optimization
When motor is driven at a very low speed using a small driving voltage, the resulting phase
current can be distorted. As a consequence, the motor position is different from the ideal
one (see Figure 13).
L6470 implements a low speed optimization in order to remove this effect.
Figure 13.
Current distortion and compensation
The optimization can be enabled setting high the LSPD_OPT bit in MIN_SPEED register
(see paragraph 9.1.8) and is active into speed range from zero to MIN_SPEED. When low
speed optimization is enabled, speed profile minimum speed is forced to zero.
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