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Inverter control device, electric compressor using inverter control device, and electric equipment

A control device and inverter technology, applied in control systems, electronic commutation motor control, single motor speed/torque control, etc. Brush DC motor operation control and other issues to achieve high operation control, suppression of misalignment stop, stable and reliable effects

Inactive Publication Date: 2013-01-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in this inverter control device, there is a constraint that the commutation control of the inverter circuit unit is limited to the range in which the induced voltage can be monitored.
[0009] In addition, in the inverter control device disclosed in Patent Document 1, when a load fluctuation or a voltage fluctuation due to a sudden rotation fluctuation occurs in the brushless DC motor, it is difficult to detect the zero-crossing point of the waveform of the induced voltage.
In this state, the relative position of the rotor cannot be recognized in the running brushless DC motor
Therefore, the operation control of the brushless DC motor cannot be continuously performed, and the brushless DC motor stops due to imbalance.

Method used

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  • Inverter control device, electric compressor using inverter control device, and electric equipment
  • Inverter control device, electric compressor using inverter control device, and electric equipment
  • Inverter control device, electric compressor using inverter control device, and electric equipment

Examples

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Embodiment approach 1

[0032] [Basic structure of inverter control unit]

[0033] First, refer to figure 1 An example of the configuration of the inverter control device according to Embodiment 1 of the present invention will be specifically described.

[0034] like figure 1 As shown, the inverter control device 20 of this embodiment is a device that controls the operation of the brushless DC motor 30 and includes an inverter circuit unit 21 , a rotor position signal generation circuit unit 22 , and an inverter control unit 23 .

[0035] The brushless DC motor 30 set as the control object by the inverter control device 20 is a three-phase permanent magnet synchronous motor, such as figure 1 As shown, a stator 31 composed of three-phase windings and a rotor 32 including permanent magnets 32a to 32f are included.

[0036] The stator 31 includes a stator winding 31u corresponding to the U phase, a stator winding 31v corresponding to the V phase, and a stator winding 31w corresponding to the W phase. ...

Embodiment approach 2

[0119] In Embodiment 1 described above, the drive controller 231 can switch control under any conditions when returning from forced synchronous commutation control to position detection commutation control (see image 3 step S106). On the other hand, in Embodiment 2, the drive controller 231 may be configured such that the forced synchronous commutation control returns to the position detection commutation control based on the rotational speed command, for example. Next, this structure will be specifically described.

[0120] like figure 1 As shown, the inverter control device 20 according to the second embodiment has the same configuration as that described in the above-mentioned first embodiment, and therefore a specific description thereof will be omitted. Here, in the inverter control device 20 of the present embodiment, when the drive controller 231 controls the commutation of the PWM inverter 211 based on the forced synchronous commutation signal (that is, the forced s...

Embodiment approach 3

[0130] In Embodiment 1 or 2 above, an example in which the inverter control device 20 is used to control the sensorless operation of the brushless DC motor 30 has been described. The inverter control device 20 of or 2, the electric compressor of the brushless DC motor 30 whose operation is controlled by the inverter control device 20, and the refrigerator including the electric compressor will be specifically described.

[0131] [Structure Example of Electric Compressor]

[0132] The inverter control device 20 of Embodiment 1 or 2 described above can be preferably used for an electric compressor included in a refrigerator. refer to Figure 8A The electric compressor will be specifically described.

[0133] like Figure 8A As shown, the electric compressor 40 is equipped with the inverter circuit part 21 of Embodiment 1 or 2, the inverter control part 23, the brushless DC motor 30, and the compression mechanism 41. The inverter control device 20 is constituted by an inverte...

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Abstract

The invention provides an inverter control device, an electric compressor using inverter control device, and electric equipment. The inverter control device controls the operation of a brushless DC motor selsorlessly. A driving controller of the inverter control device switches commutation of switching elements from control based on a position detection commutation signal to control based on a forced synchronization commutation signal if an output voltage of an inverter circuit section is equal to or greater than a preset threshold and a value of a rotational speed detected by the rotational speed detector is equal to or less than a reference value less than a target value of the rotational speed. The output voltage controller of the inverter control device changes the output voltage control signal based on a phase difference detected by a phase difference detector when the driving controller is controlling commutation of switching elements based on the forced synchronization commutation signal.

Description

technical field [0001] The present invention relates to an inverter control device for controlling energization of a brushless DC motor, an electric compressor using the inverter control device, and electric appliances such as household refrigerators equipped with a brushless DC motor driven by the inverter control device . Background technique [0002] Currently, an inverter control device including an inverter circuit is widely used for operation control of a brushless DC motor. A brushless DC motor, which is the object of control, usually has a structure including a rotor equipped with permanent magnets and a stator composed of three-phase windings. Furthermore, in the brushless DC motor configured as described above, the inverter control device generates a rotating magnetic field by switching the energized phase of the stator (performing a commutation (commutation) operation) in accordance with the magnetic pole position of the rotor. Therefore, the rotor of the brushl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02P6/18H02P6/06H02P6/182
CPCH02P6/18H02P6/182H02P6/145H02P6/08H02P6/153
Inventor 远藤胜己福田充浩甲田笃志
Owner PANASONIC CORP
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