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[0004] The magnitude of the induced voltage used in the former method is characteristically proportional to the speed of the rotating electrical machine. Therefore, in the zero-speed and low-speed ranges, the induced voltage decreases and the S / N ratio deteriorates, making it difficult to estimate the rotating electrical machine with high accuracy. The rotor position of
Method used
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Embodiment approach 1
[0034] figure 1 It is a block diagram of the control device of the rotating electric machine in Embodiment 1 of this invention.
[0035] In Embodiment 1, an embedded magnet type synchronous motor is applied to the rotary electric machine 1 in this example. In addition, the control device of this embodiment for controlling the rotating electric machine 1 includes a current detecting unit 2 connected to a voltage applying unit 3 that applies a predetermined control voltage to the rotating electric machine 1, and detects that the voltage flowing through the rotating electric machine 3 is connected to the rotating electric machine. The electric rotating machine current iu, iv, iw between 1; The position estimation unit 4 estimates the rotor position θL of the electric rotating machine 1 based on the electric rotating machine current iu, iv, iw detected by the current detecting unit 2; and the control unit 5 , and output voltage commands Vup*, Vvp*, Vwp* for drive control to the v...
Embodiment approach 2
[0122] Figure 6 is a configuration diagram of a control device for a rotating electrical machine in Embodiment 2 of the present invention, and figure 1 In Embodiment 1 shown, the corresponding or equivalent components are assigned the same symbols. In addition, in Figure 6 Since the parts other than the configuration of the position estimating current amplitude computing unit 7 in the position estimating unit 4 are the same as those in the first embodiment, the description of the parts other than the position estimating current amplitude computing unit 7 is omitted here.
[0123] In the position estimation means 4, similarly to the case of the first embodiment, current extractors 6u, 6v, 6w extract the same voltage commands Vuh, Vvh, Vwh for position estimation from the rotating electrical machine currents iu, iv, iw. The position estimation currents iuh, ivh, and iwh of the frequency components, therefore, the position estimation current amplitude calculation unit 7 calcu...
Embodiment approach 3
[0134] Figure 8 is a configuration diagram of a control device for a rotating electrical machine in Embodiment 3 of the present invention, and figure 1 In Embodiment 1 shown, the same code|symbol is attached|subjected to the corresponding or equivalent structural part. In addition, in Figure 8 Since the parts other than the configurations of the position estimation unit 4 and the control unit 5 are the same as those of the first embodiment, the description of the parts other than the position estimation unit 4 and the control unit 5 will be omitted here.
[0135] The control unit 5 has a drive voltage command calculation unit 11, a position estimation voltage generator 12, a first coordinate converter 15, a two-phase / three-phase converter 16, and an adder 23d. Further, the drive voltage command calculation unit 11 includes two subtractors 13d and 13q, a d-axis current controller 14d, a q-axis current controller 14q, a second coordinate converter 17, and a three-phase / two-p...
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Abstract
A control means (5) for outputting a voltage command for controlling the drive of a rotating electric machine (1) adds a position estimation voltage command, which is generated in a position estimation voltage generator (12) and is used for estimating a rotor position, to a driving voltage command in adders (23u to 23w) and outputs as the voltage command. A position estimation means (4) includes: current extractors (6u to 6w) for extracting a position estimation current having the same frequency component as the position estimation voltage command from a rotating electric machine current detected by a current detection means (2); a position estimation current amplitude calculation unit (7) for calculating a position estimation current amplitude from the position estimation current; and an estimation position calculator (8) for calculating the estimation position of the rotating electric machine (1), based on the position estimation current amplitude. The position estimation current amplitude calculation unit (7) calculates the position estimation current amplitude, based on the autocorrelation value obtained by squaring the position estimation current.
Description
technical field [0001] The present invention relates to a control device and a control method for a rotating electric machine such as an induction motor and a synchronous electric machine, which can obtain rotor position information without using a rotational position sensor to perform drive control. Background technique [0002] In order to control the rotation operation of the rotating electrical machine with high precision, information on the rotor position of the rotating electrical machine and information on the current flowing through the rotating electrical machine are required. Here, regarding the rotor position information, conventionally, the rotor position information is obtained by separately attaching a rotational position sensor to the rotating electric machine. However, from the standpoint of cost reduction, space saving, and reliability improvement, the disadvantage of providing a separate rotational position sensor is large, and therefore sensorless transfor...
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