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Control device and control method of alternating current motor?

A technology for AC motors and control devices, applied in the direction of AC motor control, electronic commutation motor control, current controllers, etc., can solve the problem that the current offset cannot be removed, the current offset changes, and the current cannot be detected Changes in offsets, etc.

Inactive Publication Date: 2013-05-15
AISIN SEIKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, if there is a detection error in the rotational phase of the rotor, the current offset will change depending on the magnitude or sign of the detection error.
The control device of Patent Document 1 cannot detect the actual current offset generated in the operating state of the motor, nor can it detect the change of the current offset
[0008] In addition, in the control device that controls the phase of the rectangular wave voltage based on the torque command value, the control of switching the positive and negative of the rectangular wave is performed every 180° of the electrical angle, but it does not have the function of controlling the amplitude of the positive and negative voltage.
Therefore, even if there is a current offset, it cannot be removed

Method used

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  • Control device and control method of alternating current motor?
  • Control device and control method of alternating current motor?
  • Control device and control method of alternating current motor?

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Embodiment Construction

[0073] refer to Figure 1 ~ Figure 7A , 7B, the control device of the AC motor according to the embodiment of the present invention will be described. figure 1 It is a figure explaining the whole structure which includes the control apparatus 1 of the AC motor which concerns on embodiment, and the AC motor 9 which is a control object. As the drive source of the AC motor 9, a combination of the inverter circuit 2, the DC power supply 3, and the drive circuit 4 is used. The control device 1 transmits control signals CU, CV, and CW to the drive circuit 4 to drive the inverter circuit 2 to finally control the AC motor 9 . First, refer to figure 1 , to describe the overall structure in detail.

[0074] The AC motor 9 is mainly composed of a stator 91 and a rotor, wherein the stator 91 has three-phase armature windings 92 , 93 , 94 connected in a Y shape, and the rotor has magnetic pole pairs omitted in the figure. In this embodiment, there is no particular limitation on the num...

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Abstract

The invention provides a control device and a control method, which can detect current offset amount under the moving state of the AC motor conducting phase control of voltage, and can inhibit or eliminate the current offset amount through controlling a voltage waveform. A control device of the alternating current motor controls the voltage waveform on the condition of considering the current offset amount of the AC motor (9) having current detection units (97U-97W) and a phase detection unit (95). The control device comprises voltage phase setting portion (12), an offset detecting unit (11), a switch control unit (13) and a waveform switching unit (16).

Description

technical field [0001] The present invention designs a control device and a control method for an AC motor, and more specifically, relates to a control device and a control method that take into account the offset of the current that energizes an armature winding of a stator. Background technique [0002] In recent years, the technology of using an inverter as a driving device for an AC motor has been popularized, and the control performance has been significantly improved compared with the conventional technology. In many cases, the current flowing to each phase of the armature winding of the stator and the rotation phase of the rotor are detected by the control of the drive device to which the inverter is applied, and based on the torque command value from the outside, by controlling the rectangular The phase of the wave voltage, or the pulse width modulation (PWM) method is used to control the effective value of the voltage to adjust the output torque. There is also a te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02P6/06H02P6/08H02P6/16H02P6/28
CPCH02P6/00H02P6/14
Inventor 广濑祥多
Owner AISIN SEIKI KK
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