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Rotating electric machine control device and electric power steering apparatus

A technology for rotating electrical machines and control devices, which is applied in the direction of motor control, power steering mechanisms, electric steering mechanisms, etc., and can solve problems such as excessive power supply current flowing out, insufficient output of rotating electrical machines, and error margins, etc.

Active Publication Date: 2014-09-17
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the motor voltage limit command value can have an error margin
If the motor voltage limit command value has an error margin, the output of the rotating motor may be insufficient due to excessive limitation of the power supply current, or an excessive power supply current may flow due to insufficient limitation of the power supply current

Method used

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  • Rotating electric machine control device and electric power steering apparatus
  • Rotating electric machine control device and electric power steering apparatus
  • Rotating electric machine control device and electric power steering apparatus

Examples

Experimental program
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no. 1 approach ）

[0020] will refer to figure 1 The rotating electric machine control device 1 according to the first embodiment of the present disclosure will be described. The rotary electric machine control device 1 controls the driving of an electric motor 10 as a rotary electric machine. The rotary electric machine control device 1 can be used, for example, in an electric power steering apparatus that assists a steering operation of a vehicle.

[0021] figure 2 is a diagram showing a steering system 90 including an electric power steering device 99 . The electric power steering device 99 includes a torque sensor 94 . A torque sensor 94 is attached to a steering shaft 92 connected to a steering wheel 91 . The torque sensor 94 detects the steering torque input by the driver to the steering shaft 92 via the steering wheel 91 .

[0022] Attached to one end of the steering shaft 92 is a pinion gear 96 . The pinion gear 96 meshes with the rack shaft 97 . At the end of the rack shaft 97,...

no. 2 approach ）

[0060] will refer to image 3 A rotating electric machine control device according to a second embodiment of the present disclosure will be described. The rotating electric machine control device according to the present embodiment has a physical configuration similar to that of the rotating electric machine control device according to the first embodiment. However, the limit gain determination section 50 according to the present embodiment determines the limit gain Glimit in a manner different from that of the first embodiment.

[0061] In the present embodiment, the limit gain determination section 50 determines the limit gain Glimit through a series of first to fourth steps described below. In the present embodiment as well, the limit gain determination section 50 repeats the series of first to fourth steps at a predetermined cycle and determines the limit gain Glimit each time.

[0062] In the first step, the limit gain determination section 50 is based on the U-phase cu...

Embodiment approach ）

[0083] Parts of the components in the above-described embodiments may be combined unless there is an obstacle. For example, in the first embodiment, a target power supply current may be determined based on a map, or a limited gain may be set as a value that passes a filter.

[0084] In another embodiment, the target power supply current may be determined based on a calculation formula that is not limited to the mapping. In another embodiment, the limited voltage command value is calculated only for the q-axis voltage command value. In this case, only the q-axis component in the supply current is limited. Therefore, when the rotation of the rotary electric machine is important, the rotary electric machine according to the present embodiment is suitable.

[0085] In another embodiment, the rotating electrical machine may be a multi-phase rotating electrical machine other than a three-phase rotating electrical machine. The rotary electric machine control device according to th...

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PUM

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Abstract

In a rotating electric machine control device, a voltage command value calculation section calculates a voltage command value based on a current command value and a motor current. An inverter power estimation section estimates an inverter power based on the motor current. A power supply current estimation section estimates a power supply current based on the inverter power and a power supply voltage. A limit gain determination section determines a limit gain based on the power supply current and a target power supply current. A limited voltage command value calculation section calculates a limited voltage command value based on the voltage command value and the limit gain. A current limitation section is capable of limiting the power supply current by outputting a command value corresponding to the limited voltage command value to an inverter portion.

Description

technical field [0001] The present disclosure relates to a rotary electric machine control device and an electric power steering apparatus including the rotary electric machine control device. Background technique [0002] Generally, there is known a rotary electric machine control device that limits the power supply current flowing from the power supply to the inverter unit and controls the drive of the rotary electric machine. For example, the rotating electric machine control device disclosed in JP-A-2011-125134 limits heat generation on the power supply path and breakdown of switching elements in the inverter section by limiting the power supply current. In addition, the rotary electric machine control device disclosed in JP-A-2011-125134 is used as a control device for a rotary electric machine in an electric power steering system in a vehicle to limit the impact of excessive current consumption by the rotary electric machine on other components in the vehicle. system ...

Claims

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Application Information

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IPC IPC(8): H02P6/08B62D5/04H02P27/04H02P21/00H02P25/022H02P25/026
CPCH02P6/002H02P29/028B62D5/04H02P21/0035B62D5/046B62D5/0481H02P29/032H02P6/28
Inventor 小林大辅
Owner DENSO CORP
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