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Motor control apparatus

A technology for motor control and excitation of motors, applied in motor control, electromechanical devices, control systems, etc., can solve problems such as inability to effectively display motor performance, limit current, increase component ratings or radiator body size, etc.

Active Publication Date: 2016-05-11
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, when the temperature is estimated with reference to the phase with the largest thermal resistance (the temperature tends to increase the most) from the viewpoint of equipment protection, the temperature is largely over-expected for the phase with relatively small thermal resistance (the temperature is difficult to increase) rise
Therefore, the current is excessively limited, and the performance of the motor cannot be effectively displayed
[0012] Therefore, the temperature estimation cannot be performed with a sufficiently high accuracy in a conventional manner taking into account external factors or changes in control conditions
Can not effectively display the performance of the motor
When the required torque is to be ensured even under current limitation, the rating of the component or the body size of the heat sink is increased

Method used

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no. 1 approach

[0067] will refer to Figure 2 to Figure 6 A motor control device according to a first embodiment of the present invention will be described.

[0068] like figure 2 As shown, the motor control device 90 in Embodiment 1 includes a main delay arithmetic unit 1, a sensor value adder 14, an offset adder 15, a response constant determination section 2, and an offset temperature determination section as configurations related to temperature estimation 5. Incidentally, in the first embodiment, the drive control of the inverter 70 is not limited to PWM control.

[0069] Main delay arithmetic unit 1 receives current square value (I 2 ) and the time average of the integral value (ΣI 2 / Δt). Incidentally, the current square value of the current used to excite the motor may represent the current square value of the current supplied to the motor. The currents include phase currents lu, lv and lw and dq axis currents Id and Iq. The main delay arithmetic unit 1 calculates the main de...

no. 2 approach

[0098] will refer to Figure 7 to Figure 12 A motor control device according to a second embodiment of the present invention will be described.

[0099] like Figure 7 As shown, the motor control device 90 of the second embodiment includes a main delay arithmetic unit 41, a sensor value adder 14, an offset adder 15, a response constant determination section 2, and a motor lock determination section 6 as configurations related to temperature estimation. . The basic configuration is the same as that in the following third to sixth embodiments.

[0100] The main delay arithmetic unit 1 according to the second embodiment receives the squared value (lu 2 , lv 2 , lw 2 ), or the time average of the integral of this squared value (e.g. ΣIu 2 / Δt). The main delay arithmetic unit 1 calculates the main delay response by using the transfer function "K / (τs+1)" for the input phase current square value. In this case, K is the gain and τ is the time constant. The combination of gain...

no. 3 approach

[0125] will refer to Figure 13 to Figure 18B A third embodiment of the present invention will be described.

[0126] like Figure 13 As shown, instead of the phase currents of the second embodiment, according to the third embodiment, the sum of the squares of the dq axis currents (Id 2 +Iq 2 ) is input to the main delay arithmetic unit 1. The main delay arithmetic unit 1 calculates the main delay response by using the transfer function "K / (τs+1)" for the integral value of the dq-axis current square value. According to the third embodiment, only the modulation pattern is input to the response constant determination section 2 . In other words, in the third embodiment, the temperatures of the upper MOS and the lower MOS are estimated not for each phase but including three phases. The gain K and time constant τ used for the main delay calculation do not depend on the sign of the q-axis current Iq and the electrical angle θ.

[0127] like Figure 14 As shown, the gain deter...

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Abstract

A motor control apparatus that estimates a temperature of a temperature estimation target element at a time of energizing the motor and drives a motor by controlling an electric power is provided. The motor control apparatus includes a primary delay arithmetic unit that outputs a primary delay response as an amount of temperature change, a sensor value adder that adds a sensor value of a temperature sensor to the amount of temperature change, an offset adder that adds an offset temperature to an output of the sensor value adder, a response constant determination portion that determines the gain and the time constant, and an offset temperature determination portion. At least one of the response constant and the offset temperature is changed according to a supply voltage or an input voltage.

Description

technical field [0001] The present disclosure relates to a motor control device with an overheating prevention function. Background technique [0002] Patent Document 1: JP4483298B2 [0003] Patent Document 2: JP2009-17707A [0004] Conventionally, motor control devices are known. The motor control device estimates temperatures of electronic components (eg, elements) used to configure motor coils or power converters. And the motor control device limits the current command value to prevent overheating. In the temperature estimation method of the motor coil disclosed in Patent Document 1, the time average value of the integral value of the current square value of the current supplied to the motor coil is input to the main delay function. The temperature estimation method estimates the temperature of the motor coils. In Patent Document 2, the estimated temperature of each phase is calculated by adding the temperature measurement result of the inverter measured by the tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K11/25H02P1/26
CPCH02P1/26B62D5/0409H02P29/64H02P21/22
Inventor 远藤豪
Owner DENSO CORP