A method for direct torque control of a dual-three-phase permanent magnet synchronous motor

A direct torque control, dual three-phase permanent magnet technology, used in motor control, motor generator control, electronic commutation motor control, etc., can solve the problems of unstable switching frequency, increased system loss, and large harmonic current. , to achieve the effect of constant switching frequency, suppressing torque ripple and reducing harmonic current

Active Publication Date: 2019-01-15
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

However, only one voltage vector is applied in one control cycle, and there are problems of large torque ripple and unstable switching frequency.
When traditional DTC is applied to dual three-phase motors, according to the theory of vector space decoupling, it will cause the problem of large harmonic current and increase system loss

Method used

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  • A method for direct torque control of a dual-three-phase permanent magnet synchronous motor
  • A method for direct torque control of a dual-three-phase permanent magnet synchronous motor
  • A method for direct torque control of a dual-three-phase permanent magnet synchronous motor

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Embodiment Construction

[0026] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] The method specifically includes the following steps:

[0028] Step 1: Construct a synthetic voltage vector to form a new switch table. The specific method is as follows:

[0029] Step 1.1: According to the vector space decoupling principle, decompose the dual-three-phase system from a six-dimensional space into three mutually orthogonal two-dimensional subspaces: αβ, xy and o1o2, in which only the components of the αβ subspace participate in the electromechanical energy conversion , and the xy harmonic plane will have a large harmonic current due to its small impedance.

[0030] Step 1.2: From the spatial distribution of voltage vectors, it can be known that the large and medium vectors in the same direction in the αβ plane correspond to the small and medium vectors in the opposite direction in ...

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Abstract

A method for direct torque control of a dual-three-phase permanent magnet synchronous motor comprises the steps of: 1, construct a composite voltage vector to form a new switching table. 2, synthesizethat duty cycle of the vector; Step 3: Adjust the action sequence of the zero vector and the synthetic vector, and carry out the centralized treatment on the PWM waveform. The invention improves thetraditional direct torque control through the modulation of the synthetic vector and the duty ratio. The introduction of the synthetic vector can effectively reduce the harmonic current, and no additional harmonic plane current regulator is required. The calculation of the duty cycle is simple, and the torque ripple can be suppressed by adding zero vector in the control cycle reasonably. And in order to facilitate the hardware implementation of PWM modulation, the center symmetrical PWM waveform can be obtained by adjusting the sequence of vector action, and the switching frequency is constant.

Description

technical field [0001] The invention relates to a direct torque control method of a double-three-phase permanent magnet synchronous motor, which belongs to the technical field of multi-phase motor control. Background technique [0002] In occasions that require low voltage, high power and high reliability, compared with traditional three-phase motors, multi-phase motor drive systems provide more control resources and have received more and more attention, such as electric vehicles, ship electric propulsion, All-electric aircraft, wind power generation, etc. However, if the traditional direct torque control is simply extended to the multi-phase system, there will be problems of torque ripple and large harmonic current, and the constant switching frequency cannot be guaranteed. [0003] Direct torque control (direct torque control, DTC) has been widely used in three-phase motor drive systems. The traditional direct torque control is based on the torque and flux linkage error,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/30
CPCH02P2205/05H02P21/30
Inventor 张志锋朱春海毕猛王凯东
Owner SHENYANG POLYTECHNIC UNIV
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