Motor control apparatus
A technology for control devices and electric motors, applied in motor generator control, AC motor control, electronic commutation motor control, etc., can solve problems such as unstable control state, poor current phase angle convergence, and current fluctuations
Active Publication Date: 2010-12-01
YASKAWA DENKI KK +2
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Problems solved by technology
[0010] The above-mentioned control device firstly changes the energization phase for the minimum current by a certain amount, so it takes a long time to reach the current phase angle for the minimum current.
Also, since the control is not performed with an index for quickly reaching the target value, the convergence to the current phase angle that makes the minimum current is not good
[0011]Second, if the energized phase changes by the magnitude of the phase change amount near the energized phase with the minimum current, the current also fluctuates, and the control state is unstable
Method used
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Embodiment Construction
[0030] Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same code|symbol is attached|subjected to the same component.
[0031] figure 1 It is a block diagram of the motor control device 1 according to the first embodiment of the present invention.
[0032] The motor control device 1 includes: a motor 101 as a load; a current detector 102 that detects a phase current flowing through the motor 101; and a position detector 103 that detects the position of the motor 101.
[0033] Furthermore, the motor control device 1 includes: an inverter unit 104 that applies a voltage command (vdref, vqref) described later to the motor 101; d and the direction (q-axis) i perpendicular to the d-axis q A coordinate transformer 105 that performs coordinate transformation.
[0034] In addition, the motor control device 1 is equipped with a method for controlling the d-axis current command value idref and the q-axis current command...
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The invention provides a motor control apparatus, concretely comprising a current-command divider configured to divide a command current amplitude into command current components based on a phase-angle command value that is a sum of the phase angle and an alternating current signal; a current controller configured to control current to match a motor current flowing through the motor with the command current components; a torque-variation calculator configured to calculate a motor electric power based on the command voltage and either the motor current or the command current components and to calculate a torque variation based on the motor electric power; a phase angle generator configured to generate a phase angle based on the torque variation.
Description
technical field [0001] The present invention relates to a motor control device capable of efficiently controlling a motor without being affected by fluctuations in motor parameters. Background technique [0002] As a method of efficiently driving a motor having magnetic saliency, a maximum torque control technique is known. The maximum torque control refers to maximizing the generated torque for the same magnitude of output current. The output current command is distributed to the d-axis current (current affecting magnetic flux) and the q-axis current (current affecting torque), and current control is performed based on the distributed current command. Available current amplitude I s , d-axis inductance L d , q-axis inductance L q , Induced voltage constant Φ a , the most suitable current phase angle β (the phase angle from the q-axis to the current vector) that provides the maximum torque condition is obtained through (1) formula. [0003] β = ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02P23/14H02P21/00H02P21/22H02P23/16H02P27/04
CPCH02P21/06Y02P80/10
Inventor 井手耕三森本进也金成旻薛承基
Owner YASKAWA DENKI KK