摘要:
A phase voltage setting unit is configured to define an actual current phase region including a current phase error range based on parameters to which is added an individual difference of at least any one of a motor and an inverter. The phase voltage setting unit defines a stable operation current phase region in which a rotor position can be detected through sensorless control, and sets, as a target current, an electric current obtained by adding a phase difference corresponding to the number of revolutions detected by the revolution number detecting unit to an electric current set by current vector control, such that the actual current phase region is within the stable operation current phase region.
摘要:
A motor control apparatus includes a phase current detecting section for detecting phase currents to a motor, a current phase/current peak value calculating section for calculating a current phase based on the phase currents, a voltage phase setting section for adding a predetermined phase difference to the current phase and setting the resultant sum as a voltage phase, a phase voltage setting section for setting phase voltages to the motor based on the voltage phase and the command voltage. Basically, the motor is operated by maintaining the voltage at constant and always monitoring the current/voltage phases so as to maintain a constant phase difference, without the motor axis position being predicted.
摘要:
An applied-voltage electrical angle setting method for a synchronous motor includes detecting applied voltage and current of the synchronous motor M, calculating current peak value Ip based on the detected values while calculating present applied voltage phase α, calculating target current phase βtarg based on the current peak value Ip followed by calculating target applied voltage phase αtarg corresponding to the target current phase in a target value setting unit 20, and calculating new applied voltage electrical angle instruction value θvtarg, based on change angle Δθv obtained by correcting a difference between the present applied voltage phase α and the target applied voltage phase αtarg by response time constant L/R of the synchronous motor, rotational speed ω calculated based on the applied voltage and the current, and the previous applied voltage electrical angle instruction value θvtarg, in a voltage electrical angle instruction value setting unit 10.
摘要:
A motor control device includes a feed-forward control unit configured to detect a change amount of any one of the target voltage, the applied voltage peak value, and the revolution number difference, which are a monitoring target. The control unit is also configured to manipulate an operation amount of a predetermined operation target on the basis of a magnitude of the change amount to correct the number of revolutions of the motor recognized by a controller.
摘要:
A motor control device has an overcurrent test unit to send a first test voltage Vt1 lower than a reference voltage Vref for overcurrent determination and a second test voltage Vt2 not lower than the reference voltage Vref to an overcurrent determination unit when a synchronous motor is not rotated. The motor control device determines that an abnormality occurs in the overcurrent detection unit when the overcurrent determination unit determines that the first test voltage Vt1 causes an overcurrent on the basis of a comparison result, or the second test voltage Vt2 causes no overcurrent on the basis of the comparison result.
摘要:
An inverter apparatus comprises an inverter circuit using pairs of switching elements. The pseudo AC voltage of each phase of this inverter circuit is controlled by pulse modulation using pulses generated by a PWM generator, and the pseudo AC voltages are applied to a power supplied load. The average voltage of respective phases of the output voltages applied to the power supplied load is detected as a virtual neutral voltage corresponding to the neutral voltage of the power supplied load by detecting the voltage at a common node where the phases of a voltage detecting circuit provided between the inverter circuit and the power supplied load are connected. The detected virtual neutral voltage is fed back for controlling the output duty of each phase by the PWM generator. Thus the output voltage of each phase from the inverter circuit is controlled so as to become a target output voltage. The target output voltage can be accurately obtained stably at all times.
摘要:
An inverter unit includes a DC power source, an inverter circuit having two or more pairs of switching elements which are connected in parallel to the DC power source, so that a DC voltage of the DC power source is converted into a pulse train-like, pseudo-AC voltage output from the inverter circuit, and a PWM generator connected to the inverter circuit for adjusting the pseudo-AC voltage by pulse width modulation. Further, the inverter unit includes a voltmeter for detecting an actual, output voltage which is output from the inverter circuit, and a duty cycle controller for controlling an output duty cycle, so that the detected, actual, output voltage becomes a target output voltage. In this inverter unit, a desirable, output voltage may be obtained stably and accurately even if a voltage of a power source fluctuates.
摘要:
A current detection unit of an inverter outputs currents to a load, such as a motor includes a device for measuring a DC current flowing in the inverter. The current detection unit also includes a measurement time setting device for setting a measurement time of power source currents at at least one of an uppermost point and a lowest point of a reference chopping wave with a predetermined frequency, and a current phase detection means for detecting at least two phase currents from respective power source currents measured at two or more measurement times sequential to each other. A phased current output from the inverter to a load, such as a motor, may be detected with a high degree of accuracy and at a constant period.
摘要:
Proposed is a motor control device that executes rotational control that follows load fluctuations in a startup mode. The proposed motor control device is provided with: detection means 4 that detects a current peak value Ip and a current electrical angle θi based on phase currents Iu to Iw; detection means 5 that detects an induced voltage peak value Ep and an induced voltage electrical angle θe based on phase currents Iu to Iw and applied voltages Vu to Vw; rotor position detection means 6 that detects a rotor position θm using θm=θi−β−90° or θm=θe−γ−90°; velocity fluctuation detection means 15 that detects a rotational velocity ω based on this θm; and startup means 10 that outputs a startup voltage instruction value Vp and a startup voltage phase instruction value θv, increases the rotational velocity of the synchronous motor M with predetermined acceleration, and makes the rotational velocity ω detected by the velocity fluctuation detection means 15 be reflected in θv.
摘要翻译:提出了一种电动机控制装置,其执行在启动模式下的负载波动之后的旋转控制。 所提出的电动机控制装置设有:检测装置4,其根据相电流Iu至Iw检测当前峰值Ip和当前电角度; i; 检测装置5,其基于相电流Iu至Iw和施加电压Vu至Vw检测感应电压峰值Ep和感应电压电角度; e; 转子位置检测装置6,用于检测转子位置; m使用&thetas; m =&thetas; i-&bgr; -90°或者Thetas; m =&thetas; e-γ-90°; 速度波动检测装置15,其基于该信号检测旋转速度ω; m; 以及启动装置10,其输出启动电压指令值Vp和启动电压相位指令值& t; v以预定加速度增加同步电动机M的转速,并使由速度变动检测装置15检测的转速ω 反映在&thetas; v。