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.

CN103107770AInactive Publication Date: 2013-05-15AISIN SEIKI KK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-05-15
Estimated Expiration
Not applicable · inactive patent

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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).
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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...

Examples

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...