Phase current detecting method and device
A detection method and phase current technology, applied in the control of electromechanical transmission devices, electrical components, control of generators, etc., can solve the problems of different periods, affecting closed-loop control performance, and each phase current can not meet the real-time requirements of phase current, etc. Achieve high real-time performance and improve closed-loop control performance
Active Publication Date: 2017-12-08
SHANGHAI SIGRINER STEP ELECTRIC
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Problems solved by technology
[0003] The inventors found that there are at least the following problems in the prior art: In servo control, the current loop cycle and the digital decimation filter operate independently, but because the current loop cycle is not the same as the digital decimation filter cycle, the sampled The current of each phase cannot meet the real-time requirements of servo control for phase current, thus affecting the performance of closed-loop control
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[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, various implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in this application can also be realized.
[0019] The inventors found that in the existing phase current detection scheme, the current of each phase of the motor is generally converted to analog-to-digital by a Σ-Δ analog-to-digital converter, and then the current of each phase is extracted and sampled by using a Sinc3 digital decimation filter. Assu...
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The embodiment of the invention relates to the technical field of motor control and discloses a phase current detecting method and device. According to the invention, the phase current detecting method includes starting timing when each current loop cycle of closed-loop control begins; when timing arrives a preset time length, starting a phase current sampling device for sampling so as to obtain phase current, wherein the sum of the preset time length and the sampling cycle of the phase current sampling device is smaller than and approximate to the cycle of the current loop. According to the invention, phase current of a motor can always be sampled at points approximate to ending positions of each current loop cycles, so that the closed-loop control performance of the motor is improved.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of motor control, and in particular to a phase current detection method and device. Background technique [0002] With the rapid development of science and technology, the requirements for motor control precision are getting higher and higher. Motor control generally adopts a closed-loop control system. Such as figure 1 Shown is the schematic diagram of the control structure of the permanent magnet synchronous motor closed-loop control system. First, the system calculates the stator current reference input i through the speed PI (Proportional Integral) controller according to the detected motor speed, the input reference speed and the relationship between speed and torque sqref . The stator phase currents ia and ib are extracted through the phase current detection circuit, and then they are transformed into the stator phase coordinate system by Clark (Clark) transformation, and then...
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IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 王春祥周建坤
Owner SHANGHAI SIGRINER STEP ELECTRIC