Elimination method for dead zone effect in motor FOC (field-oriented control) control operational method
A technology for control operation and dead zone effect, applied in motor generator control, electronic commutation motor control, control system, etc., can solve the problems of inaccurate elimination of dead zone effect, high equipment performance requirements, complex structure, etc.
Inactive Publication Date: 2016-08-24
SUZHOU WEIKONGZHIXIN SEMICON TECH CO LTD
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[0013] The invention provides a brand-new method for eliminating the dead zone effect in the motor FOC control operation method, which solves the problems of inaccurate elimination of the dead zone effect and high requirements for equipment performance, complex structure and high cost in the previous motor FOC control operation method
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[0038] The method for eliminating the dead zone effect in the motor FOC control operation method in the present invention is specifically as follows: firstly, the current direction is judged, that is, the two-phase current is obtained through the ADC through the double-resistor current measurement method, and through such as Figure 7 , in the FOC algorithm, the sampled two-phase current is transformed by Clarke (Clark) to obtain iα and iβ, and then by Park (Park) transformation to obtain id and iq in the two-phase rotating coordinate system. id and iq filter out high-order harmonics through a low-pass filter, and the two current values obtained finally obtain the polarity of the current. After the polarity of the two-phase current is clear, the PWM pulse width of each phase can be calculated.
[0039] First, we analyze the circuits of each phase in the two-phase current. Such as Figure 4 , ideally, Q1 and Q2 will not be turned on at the same time, but since it takes a ce...
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The invention discloses an elimination method for a dead zone effect in a motor FOC (field-oriented control) control operational method. The elimination method comprises the steps of judging the directions of a, b and c three-phase currents firstly; then inserting two dead times into the a, b and a three-phase upper bridge arms or lower bridge arms respectively according to the differences of the directions of a, b and c three-phase currents; when the current directions are forward directions, enabling the corresponding upper bridge arms to carry out on-off operations according to the pulse width time obtained by calculation, not inserting dead time in the corresponding upper bridge arms while inserting two dead time times in the corresponding lower bridge arms; and when the current directions are negative direction, enabling the corresponding lower bridge arms to carry out on-off operations according to the pulse width time obtained by calculation, and not inserting dead time in the corresponding lower bridge arms while inserting two dead times in the corresponding upper bridge arms. By adoption of the method, the technical problems of not-accurate-enough elimination of the dead zone effect and overhigh cost in the prior art can be effectively solved.
Description
technical field [0001] The invention belongs to the field of motor control systems, and in particular relates to a method for eliminating the dead zone effect in the FOC algorithm in the motor control system. Background technique [0002] At present, motors are used in various fields such as vacuum cleaners, washing machines, kitchen appliances, electric vehicles, etc., and the FOC (Field Oriented Control) algorithm gradually replaces the original six-step commutation algorithm. FOC (field-oriented control) is a field-oriented control, also known as vector control (vector control), is a technology that uses a frequency converter (VFD) to control a three-phase AC motor. And angle, to control the output of the motor. Its characteristic is that the magnetic field and torque of the motor can be individually controlled, similar to the characteristics of a separately excited DC motor. Because the three-phase output current and voltage are expressed as vectors during processing, ...
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IPC IPC(8): H02P21/00
CPCH02P21/00
Inventor 陈冬冬周毅贾金辉孙进军
Owner SUZHOU WEIKONGZHIXIN SEMICON TECH CO LTD