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Vector control dead zone compensation method and system for permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and dead zone compensation, applied in vector control systems, control systems, motor control, etc., can solve problems such as misjudgment of zero crossing, failure of dead zone compensation, and increased computing burden on the processor

Active Publication Date: 2018-10-09
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology

In addition, there are multiple coordinate transformations in this method, which increases the computational burden of the processor, and then there will be a lag due to excessive calculation, resulting in misjudgment of zero crossing, resulting in failure of dead zone compensation

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  • Vector control dead zone compensation method and system for permanent magnet synchronous motor
  • Vector control dead zone compensation method and system for permanent magnet synchronous motor
  • Vector control dead zone compensation method and system for permanent magnet synchronous motor

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Embodiment Construction

[0073] The invention provides a method for compensating dead zone of vector control of permanent magnet synchronous motor, which comprises the following steps:

[0074] Ideally, the three-phase current of the motor:

[0075] i a =Isin(ωt+θ),

[0076] Among them, ω is the electrical angular velocity, θ is the initial angle of the vector current, and I is the vector current.

[0077] Due to various interferences and the influence of the accuracy of the sampling circuit, it is difficult to detect the zero point of the current, so the dead zone compensation time cannot be judged by directly collecting the current, but the processed current can be used as a condition for dead zone compensation judgment.

[0078] 1) Calculation of three-phase current of permanent magnet synchronous motor, including:

[0079] Step 11: coordinate transformation, by the three-phase current i a,b,c Transform to static coordinates two-phase current i α，β , and then transformed from stationary coor...

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Abstract

The invention discloses a vector control dead zone compensation method and a vector control dead zone compensation system for a permanent magnet synchronous motor. The method comprises: 1) performingthree-phase current collection, corresponding coordinate transformation and filtering, and inverse coordinate transformation; 2) detecting the electrical angle of the current sampling period by the encoder provided by the motor, calculating corresponding electrical angular velocity according to the electrical angle change of corresponding time interval to calculate the electrical angular acceleration, and predicting the electrical angle of the next sampling period after the low-pass filtering processing; 3) determining whether the current time is the dead zone compensation time by comparing whether the current electrical angle and the predicted electrical angle of the next period and the current value of the three-phase current in the current sampling period is less than the set thresholds; and 4) compensating the corresponding voltage according to the judged dead zone compensation time and the current magnitude when the current crosses zero. The invention overcomes the dead zone compensation failure caused by excessive calculation and sampling lag, and realizes real-time high performance control of the motor.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method and system for compensating a dead zone under vector control of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have the advantages of small size, fast response, and high power, and are widely used in new energy vehicles, CNC machine tools, and robots. At present, the existing permanent magnet synchronous motor control systems (or drives) on the market generally adopt vector control methods. The core idea of ​​vector control is to use the stator winding of the motor to generate a rotating magnetic field, and then drive the rotor to rotate. However, in order for the stator winding to form a rotating magnetic field, it is required to have a sinusoidal three-phase current. The existing motor drive system basically adopts the AC-DC-AC inverter mode, and combines the pulse width regulation technology to control t...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P21/18
CPCH02P21/14H02P21/18H02P2207/05
Inventor 张碧陶唐秀文
Owner JIANGXI UNIV OF SCI & TECH
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