Method for eliminating sampling delay error in motor system controlled by single current sensor

A delay error, single current technology, applied in control systems, control generators, vector control systems, etc., can solve problems such as increasing the controller's computing burden, complex algorithms, and inability to measure the accuracy of motor parameters

CN113381655APending Publication Date: 2021-09-10西北工业大学太仓长三角研究院
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-09-10

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Abstract

The invention discloses a method for eliminating a sampling delay error in a motor system controlled by a single current sensor. The method comprises the following steps: 1, installing a single current sensor between a switching tube Q1 and a switching tube Q3 to construct the circuit topological structure of the single current sensor, 2, deducing a delay error expression [Delta]iSDE when sampling delay exists according to a PMSM three-phase current expression, 3, constructing a delta-gamma reference coordinate system, 4, based on the [Delta]iSDE and the delta-gamma reference coordinate system, converting the [Delta]iSDE into the delta-gamma reference coordinate system through coordinate transformation to obtain error components [Delta]i delta and [Delta] i gamma, and 5, directly filtering second harmonic components in [Delta] i delta and [delta] i gamma by applying a notch filter, and compensating a sampling delay error. According to the method, the sampling delay error in the single current sensor method can be eliminated without depending on motor parameters, and the phase current precision reconstructed in the single current sensor technology is improved.
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Description

technical field

[0001] The invention belongs to the field of motor control, and relates to a method for eliminating sampling delay errors in a motor system controlled by a single current sensor. The sampling delay error in the single current sensor method can be eliminated without depending on motor parameters. Background technique

[0002] Due to its high power density, high reliability, and high precision, permanent magnet synchronous motors (PMSM) have been widely used in aerospace, deep-water servo, and electric vehicles in recent years. The traditional PMSM control method requires at least two current sensors to obtain two-phase current information to complete vector or closed-loop control. However, multiple current sensors will not only increase the volume and cost of the controller, but also may have sampling differences among them, causing current disturbances.

[0003] Single current sensor technology, also known as phase current reconstruction technology, is a low...

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Embodiment Construction

[0036] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0037] figure 1 is the circuit topology and the installation position of the single current sensor in the method of the present invention. Such as figure 1 As shown, the single current sensor is installed on a branch of the inverter, specifically between the switching tubes Q1 and Q3. Q1, Q2, Q3, Q4, Q5, and Q6 are the six switch tubes that constitute the three-phase voltage source inverter, V dc is the DC bus voltage, A, B, and C are the three-phase windings of the permanent magnet synchronous motor, N is the neutral point of the motor winding, and ...