Modulation method of independent power supply space vector inverter circuit for single-phase induction motor
A technology of single-phase induction motor and modulation method, which is applied in vector control system, motor generator control, AC motor control, etc., and can solve problems such as poor motor performance
Inactive Publication Date: 2014-10-29
HEILONGJIANG UNIV
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[0005] The purpose of the present invention is to solve the problem that the existing single-phase induction motor performs PWM modulation, and the flux trajectory formed is elliptical, which leads to poor performance of the motor, and provides an independent power supply space vector inverter for single-phase induction motors circuit modulation method
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specific Embodiment approach 1
[0039] Specific implementation mode one: the following combination Figure 3 to Figure 7 Describe this embodiment mode, the independent power source type space vector inverter circuit modulation method of the single-phase induction motor described in this embodiment mode, the inverter circuit used in the modulation method includes a first DC power supply U1, a second DC power supply U2, a third DC power supply DC power supply U3, fourth DC power supply U4, first power switch tube S1, second power switch tube S2, third power switch tube S3, and fourth power switch tube S4,
[0040] The first DC power supply U1 and the first power switch tube S1 are connected in series and connected in parallel to the main coil L of the single-phase induction motor Q both ends of
[0041] The second DC power supply U2 and the second power switch tube S2 are connected in parallel to the main coil L of the single-phase induction motor after being connected in series. Q both ends of
[0042] The...
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The invention discloses a method for modulating a single-phase induction motor by the aid of a space-vector inverter circuit with independent power sources, and belongs to the field of motor control. The method aims to solve the problem that an existing single-phase induction motor is subjected to PWM (pulse-width modulation), a formed flux linkage track is elliptical, and accordingly the performance of the motor is poor. The method includes steps of firstly, initializing setting; secondly, enabling a single chip microcomputer to read set speed values and acquiring the period T of a rotating magnetic field according to a TST (time-space-time) array; thirdly, determining the quantity N1 of acting vectors of each quadrant according to a formula; and fourthly, generating driving signals for grid electrodes of four power switch tubes according to the period T acquired in the second step and the quantity N1, which is acquired in the third step, of the acting vectors of each quadrant, and modulating the single-phase induction motor. Each driving signal contains the acting vectors of each quadrant, a transmission sequence of the acting vectors and the acting time of each acting vector.
Description
technical field [0001] The invention relates to a modulation method of an independent power supply type space vector inverter circuit of a single-phase induction motor, belonging to the field of motor control. Background technique [0002] Single-phase induction motor is a kind of single-phase induction motor with the earliest application time and the widest application range, single-phase power supply and low power application. Its two sets of stator coils (main coil L Q and auxiliary coil L D ) are usually placed in an orthogonal manner, and the stator power supplied to the two coils should have a phase difference of 90 degrees to ensure that the stator rotating magnetic field is formed to make the rotor rotate. [0003] There are two ways to generate the quadrature control voltage of the two coils: the first method is the auxiliary coil L D Some electrical components are connected in series with the main coil L Q Parallel connection requires only one stator control vo...
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IPC IPC(8): H02M1/08H02P21/00H02P25/04
Inventor 王丁
Owner HEILONGJIANG UNIV