WO2019049284A1 - モータ制御装置及びそれを搭載した電動パワーステアリング装置 - Google Patents
モータ制御装置及びそれを搭載した電動パワーステアリング装置 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/02—Details of stopping control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/225—Detecting coils
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/24—Devices for sensing torque, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
Definitions
- the present invention relates to a motor control device having a function of detecting the temperature of an inverter (wiring pattern) for driving a motor and overheat protecting an electronic component, and an electric power steering device equipped with the motor control device.
- a motor control apparatus which arranges a temperature detection element (for example, a thermistor) on the wiring pattern of the power supply line, detects the temperature without being affected by the fluctuation of the power supply voltage, and limits the current command value based on the temperature detection value.
- a temperature detection element for example, a thermistor
- An electric power steering apparatus is an apparatus equipped with a motor control apparatus.
- the electric power steering apparatus applies a steering assist force (assist force) to the steering mechanism of a vehicle by the rotational force of the motor.
- a steering assist force is applied to a steering shaft or a rack shaft by a transmission mechanism such as a gear, etc., by a driving mechanism of a motor controlled by the power supplied from the unit (inverter).
- Such a conventional electric power steering apparatus performs feedback control of motor current in order to generate torque of steering assist force correctly.
- the feedback control is to adjust the motor applied voltage so that the difference between the steering assist command value (current command value) and the motor current detection value becomes smaller, and the motor applied voltage is generally adjusted by PWM (pulse width It is performed by adjusting the duty of modulation) control.
- PWM pulse width It is performed by adjusting the duty of modulation
- the column shaft (steering shaft, handle shaft) 2 of the steering wheel 1 is a reduction gear 3, universal joints 4a and 4b, a pinion rack mechanism 5, tie rods 6a, It passes through 6b, and is further connected to steering wheels 8L and 8R via hub units 7a and 7b.
- the column shaft 2 is provided with a torque sensor 10 for detecting the steering torque of the steering wheel 1 and a steering angle sensor 14 for detecting the steering angle ⁇ , and the motor 20 for assisting the steering force of the steering wheel 1 is a reduction gear 3 Is connected to the column shaft 2 via Electric power is supplied from the battery 13 to the control unit (ECU) 100 that controls the electric power steering apparatus, and an ignition key signal is input through the ignition key 11.
- the control unit 100 calculates the current command value of the assist (steering assist) command based on the steering torque Th detected by the torque sensor 10 and the vehicle speed Vs detected by the vehicle speed sensor 12, and compensates for the current command value
- the current supplied to the motor 20 for EPS is controlled by the voltage control command value Vref applied.
- the steering angle sensor 14 is not essential and may not be provided. It is also possible to acquire the steering angle from a rotation sensor such as a resolver connected to the motor 20.
- the control unit 100 is connected to a CAN (Controller Area Network) 40 that transmits and receives various information of the vehicle, and the vehicle speed Vs can also be received from the CAN 40.
- the control unit 100 can also be connected to a non-CAN 41 that transmits and receives communications other than the CAN 40, analog / digital signals, radio waves, and the like.
- the control unit 100 mainly includes a central processing unit (CPU) (including a micro processor unit (MPU) and a micro controller unit (MCU)), but shows general functions executed by a program in the CPU. And it looks like Figure 2.
- CPU central processing unit
- MPU micro processor unit
- MCU micro controller unit
- the control unit 100 will be described with reference to FIG. 2.
- the steering torque Th detected by the torque sensor 10 and the vehicle speed Vs detected by the vehicle speed sensor 12 (or from the CAN 40) are current commands for calculating the current command value Iref1.
- the value is input to the value calculator 101.
- Current command value calculation unit 101 calculates current command value Iref1, which is a control target value of the current supplied to motor 20, using an assist map or the like based on the input steering torque Th and vehicle speed Vs.
- the voltage control command value Vref whose characteristic is improved by the PI control unit 104 is input to the PWM control unit 105, and the motor 20 is PWM-driven through the inverter 106A.
- the current value Im of the motor 20 is detected by the motor current detector 107 and is fed back to the subtracting unit 102B.
- the inverter 106A is configured by a bridge circuit of FET (Field-Effect Transistor) as a semiconductor switching element (power semiconductor element).
- a rotation sensor 21 such as a resolver is connected to the motor 20, a motor rotation angle ⁇ is output from the rotation sensor 21, and a motor speed ⁇ is calculated by a motor speed calculator 22.
- the compensation signal CM from the compensation signal generation unit 110 is added to the addition unit 102A, and the characteristic of the steering system is compensated by the addition of the compensation signal CM to improve convergence and inertia characteristics, etc. ing.
- the compensation signal generation unit 110 adds the self aligning torque (SAT) 113 and the inertia 112 in the addition unit 114, and further adds the convergence 111 in the addition result in the addition unit 115, and compensates the addition result of the addition unit 115 It is assumed that the signal CM.
- SAT self aligning torque
- the PWM control unit 105 that calculates the PWM duty values D1 to D6 of the same and the gates of the FETs as drive elements (power semiconductor elements) with the PWM duty values D1 to D6 compensate for dead time and turn ON / It is comprised by the gate drive part 105B which turns off.
- the inverter 106A is configured of a three-phase bridge (FET1 to FET6) of FETs (for example, n-type MOS-FETs) as semiconductor switching elements, and drives the motor 20 by being turned on / off with PWM duty values D1 to D6. Do. Further, a motor relay 23 is connected to each phase for supplying power (ON) to the power supply line between the inverter 106A and the motor 20 and for interrupting (turning off) the current at the time of abnormality.
- FET1 to FET6 FETs
- n-type MOS-FETs for example, n-type MOS-FETs
- the motor current detector 107 is omitted. Further, although the resistor RS0 is connected to the power supply side of the inverter 106A in FIG. 3, it is also possible to detect the motor current in a one-shunt manner by inserting the resistor on the ground side.
- a temperature detection element such as a thermistor is installed on a circuit board that constitutes an inverter, and the thermistor 120 is connected to a stable power supply voltage (for example 5 V). The temperature is detected by A / D conversion of the value. Then, when the detected temperature reaches a predetermined temperature so as not to exceed the heat resistance temperature of the component parts, the overheat protection mechanism is configured to suppress the current or stop the operation.
- a temperature detection element such as a thermistor or the like needs a stable power supply voltage (for example, a constant 5 V power supply) as shown in FIG.
- the wiring pattern and the circuit including the temperature detection element are electrically isolated. That is, although it is desired to place a temperature detection element such as the thermistor 120 in the vicinity of the FET for accurate temperature detection, the power supply voltage of the temperature detection element is independent of the power supply VR of the inverter 106.
- the temperature detection element (thermistor 120) has to be disposed separately as shown in FIG.
- the heat generation of the inverter has to be transmitted to the temperature detection element through the insulating base material (for example, synthetic resin) having poor heat conduction characteristics, so the heat generation of the inverter is efficient As well as being unable to transfer heat to the temperature detection element well, accurate temperature detection could not be performed due to deterioration of the temperature characteristics of the substrate. That is, there is a problem that there is a possibility that the overheat protection can not be accurately performed on the parts to be protected.
- the temperature detection element is placed in the vicinity of the FET, it is necessary to devise a method of cutting a part of the wiring pattern of the original large current (see the cut portion of the pattern of FIG. 11).
- FIG. 4 shows an example of such a conventional arrangement structure of the thermistor in a cross-sectional view of a substrate, and this example shows a multi-layer substrate (conductor layers 122-1 to 122-4, insulating layers 123-1 to 123-) of four layers. 3), and a heat generating component 121 such as a FET is attached on the uppermost conductor layer 122-1 with a solder 121A. Then, the thermistor 120 is disposed on the uppermost conductor layer 122-1 with the solder 120A in the vicinity of being separated from the heat-generating component 121, and the thermal VIA 124 for dissipating heat to the heat dissipation member is provided.
- the thermistor 120 is disposed on the insulated pattern island, and the arrows indicate the heat conduction direction at each site, and the temperature detection of such a structure has the problems as described above.
- Patent No. 3889562 gazette JP, 2013-187322, A JP 2013-62269 A
- Patent Document 1 In the semiconductor device disclosed in Japanese Patent No. 3889562 (Patent Document 1), the semiconductor element and the temperature detection element are electrically connected to the metal layer on the circuit board, and the heat is transferred to the temperature detection element through the metal layer. It is configured to However, in the device of Patent Document 1, the potential at the midpoint of the arm is connected to one side of the thermistor, and there is a problem that the circuit configuration becomes complicated in that a level shift circuit is required. Further, the thermal minimum in the circuit is not clear, and in order to carry out overheat control with high accuracy, a plurality of temperature detection elements are required, and there is also a problem that the cost is increased.
- the electronic component disclosed in Japanese Patent Application Laid-Open No. 2013-187322 has a structure in which the heat coupling property is improved by using the heat generating device and the temperature detecting element using the via (VIA) and the heat transfer member.
- VVA via
- the manufacturing cost is increased.
- Patent Document 3 a plurality of temperature detection elements (thermistor) are disposed in a sandwich structure in a layer between the heat generating device and the heat sink.
- three temperature detection devices are used, and there is a possibility that a time lag may occur in the member cost, the cost increase at the time of manufacture, and the detection of the transient thermal characteristics of the heat generating device.
- the EPS has also been increased in size, and the current flowing to the motor has also been increased (for example, about 120 amperes), but conventionally the FET on the safer side by the estimation algorithm than the temperature detection value around the FET Overheat protection has been achieved, and as a result, the ability to apply a large current to the motor is suppressed.
- the FET since there is a time lag in instantaneous detection of temperature change of the heating element, there is no one that can be applied to control or the like that causes an immediate current to flow to torque (such as lock generation) unique to EPS. For example, even when a high current (for example, 100 amperes or more) flows through the FET, it is more strongly desired to improve the accuracy of temperature detection so that transient heat generated from the FET can be detected instantaneously.
- the present invention has been made under the circumstances as described above, and an object of the present invention is to provide an inexpensive configuration for temperature detection of an inverter, which can be carried out accurately without time delay, and reliably overheat electronic components based on the detected temperature. It is an object of the present invention to provide a motor control device capable of protection control and an electric power steering device equipped with the motor control device.
- the present invention relates to a motor control device that drives and controls a motor via an inverter based on a current command value
- the object of the present invention is to provide a voltage detection unit that detects a power supply voltage of a power supply connected to the inverter;
- a temperature detection element disposed on a wiring pattern of a circuit board between an inverter and the power supply, a voltage dividing circuit which divides the power supply voltage by the temperature detection element and a resistor, and a divided voltage from the voltage dividing circuit
- a temperature detection unit for detecting the temperature of the wiring pattern based on the voltage detection value detected by the voltage detection unit, and an overheat protection control for limiting the current command value based on the temperature detection value of the temperature detection unit.
- the temperature detection unit detects the temperature of the wiring pattern without being affected by the power supply voltage using a predetermined arithmetic expression or a preset data table. Is achieved by which is way.
- the above object of the present invention is that, in the circuit board, the thickness of the wiring pattern between the inverter and the power supply where the temperature detection element is disposed is uniform, and the width is larger than the width of the wiring pattern of the other part
- the width of the wiring pattern between the inverter and the power source on which the temperature detection element is disposed is uniform, and the thickness is larger than the width of the wiring pattern of the other portion, because of the narrowing or the circuit board.
- the wiring pattern between the inverter and the power source in which the temperature detection element is disposed is not dissipated on the back surface of the circuit board or in or near the circuit board.
- at least one of thermal VIA, grease, and heat sink is disposed on the back surface of the circuit board, or Road substrate is a multilayer substrate, by the temperature detecting element in the outermost layer of the multilayer substrate is provided, or by the temperature detecting element is a thermistor, it is more effectively achieved.
- the motor control device of the present invention it is a wiring pattern on which the heat generating component is mounted, and by directly mounting the temperature detection element on the wiring pattern, the thermal bonding between the high component and the temperature detection element And has excellent temperature detectability.
- the circuit board is low cost because no separate heat transfer material (thermal grease) or special processing is required, there is no need to provide an insulated pattern island near the center of the inverter, and the wiring freedom of the inverter is increased. There is an advantage.
- the design freedom of the temperature threshold of the overheat protection function can be increased. It is possible to implement the function.
- one of the temperature detection elements such as the thermistor is directly connected to the conductive (excellent heat conduction) wiring pattern of the power supply line (VR line) of the inverter which generates heat easily.
- the present invention provides a motor drive device excellent in the transient response of the temperature detection of the heat generating part by connecting the contacts of (1) and the power supply (VR) to the other contact. Specifically, the divided voltage of the power supply voltage is detected by the temperature detection element (power supply side) and the resistor (GND side) and the resistance connected to the power supply and the ground, and the voltage detection of the power supply is detected by the detected divided voltage.
- the influence of voltage fluctuation of the power supply is eliminated, and temperature detection (the temperature of the wiring pattern to which one contact of the temperature detection element is connected) is referred to by referring to the data table for calculation or temperature conversion. It is possible.
- the power supply voltage is usually almost the same as the battery voltage of the vehicle, so the voltage fluctuation is large, and the voltage fluctuation due to its own motor drive is remarkable, so in order to enable accurate temperature detection, It is necessary to eliminate fluctuations.
- the shape of the wiring pattern is devised so that the amount of heat generation of the conductive wiring pattern of the power supply line which is the temperature detection portion becomes large.
- the width of the wiring pattern of the circuit board for temperature detection is partially narrowed, or the number of thermal vias of the wiring pattern for temperature detection is adjusted, or the heat around the wiring pattern for temperature detection is heat sink.
- the present invention is a motor control device in which an inverter for driving a motor is provided with a temperature detection element directly on the wiring pattern of a power supply line susceptible to heat generation to detect temperature and high thermal coupling from the heat generating portion and excellent temperature detection performance.
- I will provide a.
- the circuit board does not require a separate heat transfer member or special processing to enhance the thermal bondability from the heat generating portion, and the cost is low.
- thermal VIA and the heat transfer material are separately provided, but in the present invention, inclusions such as thermal grease from the heat generating portion to the temperature detection element.
- thermal VIA and the like for increasing the heat transfer efficiency between the heat generating portion and the temperature detection element are not newly provided.
- the temperature detection unit can be intentionally heated significantly and adjustment is also possible. It is. Based on the detected temperature, it is possible to increase the degree of freedom in the threshold design of the overheat protection and to prevent the heat resistance temperature of the components of the inverter from being exceeded.
- FIG. 5 shows a configuration example of the present invention corresponding to FIG. 3, and a thermistor 130 is connected to a power supply line of the inverter 106 as a temperature detection element, and a power (VR) voltage of the inverter 106 at the time of motor drive
- a power (VR) voltage of the inverter 106 at the time of motor drive
- large capacity capacitors C1 to C3 are disposed in each arm on the power supply line.
- the power supply voltage for the thermistor 130 is not provided, and the same power supply voltage VR as that of the inverter 106 is applied to the thermistor 130.
- the large-capacity capacitors C1 to C3 are formed of an electrolytic capacitor, a conductive polymer hybrid electrolytic capacitor, or the like.
- the arrows in the inverter 106 indicate the flow of current
- the solid line indicates the flow of current when the upper arm FET is turned on
- the broken line indicates via the parasitic diode when the upper arm FET is turned off. It shows the current flowing.
- the inverter 106 is connected to a voltage detection unit 143 that detects a power supply voltage, and is also connected to a thermistor 130 and a voltage dividing circuit 144 that divides the power supply voltage with a resistor.
- the power supply voltage VRd detected by the voltage detection unit 143 and the divided voltages V1 and V2 of the voltage dividing circuit 144 are input to the temperature detection unit 142, and the temperature detection unit 142 detects the temperature using a data table for temperature conversion.
- the temperature detection value Tm detected by the temperature detection unit 142 is input to the overheat protection control unit 141, and the current limit value Ir is input to the motor drive control unit 140.
- the motor drive control unit 140 limits the current command value (assist command) based on the current limit value Ir.
- FIG. 6 shows an arrangement example of the thermistor 130 corresponding to FIG. 4, and the thermistor 130 is attached on the wiring pattern by the solder 130A.
- the thermal VIA 124 is shown in this example, it may be omitted.
- FIG. 7 shows a configuration example of the voltage dividing circuit 144 and the connection of the thermistor 130.
- One end of the thermistor 130 is connected to the power supply voltage VR, and the other end is grounded (GND) via the resistor R1.
- a voltage dividing circuit of resistors R3 and R4 is provided between the power supply and the ground.
- the output voltage V1 of the voltage dividing circuit including the thermistor 130 and the resistor R1 becomes the following equation 1, and the output voltage V1 is affected by the fluctuation of the power supply voltage VR.
- the output voltage V2 of the voltage dividing circuit formed by the resistors R3 and R4 is expressed by the following equation 2. Similarly, the output voltage V2 is affected by the fluctuation of the power supply voltage VR.
- the voltages V1 and V2 from the voltage dividing circuit 144 are input to the temperature detection unit 142 and A / D converted respectively, and the respective digital values are VAL1 and VAL2. Then, the digital value VAL1 is divided by the digital value VAL2 to obtain a value VAL3. That is, the value VAL3 is the following equation 3.
- the value VAL3 depends only on the resistance RZ of the thermistor 130. Therefore, the temperature Tm can be detected by preparing the relationship between the resistance of the thermistor 130 and the temperature in the form of a data table, or by calculating. That is, by performing temperature detection based on the relationship between the value VAL3 and the temperature detection value Tm as shown in FIG. 8, the temperature does not suffer from the influence of the voltage fluctuation even in the configuration using the power supply voltage with a large voltage fluctuation. It becomes possible to detect correctly.
- the thermistor resistance at temperature T 0 [K] is R 0
- the thermistor resistance RZ at temperature T [K] can be expressed by the following equation 4.
- B is called a B constant of the thermistor, and is different for each thermistor.
- Steinhart-Hart equation Equation 5 as an approximation of the temperature resistance characteristic of a thermistor whose approximation is higher than the equation 4.
- a, b and c are called Steinhart-Hart parameters and are designated for each thermistor. It can be understood from the above equation 4 that the thermistor resistance RZ depends on the temperature, and from the equation 5 it is possible to obtain the thermistor temperature T, that is, the temperature of the wiring pattern in which the thermistor 130 is installed. In the present invention, not the cyclic detection but the detection of the channel CH1 which measures the power supply voltage VR (VRd) and performs A / D conversion, and the measurement of the voltage division value V1 of the thermistor 130 makes the A / D conversion of the channel CH2.
- the detection and the detection of the channel CH3 for measuring and A / D converting the voltage division value V2 of the voltage dividing circuit 144 are sampled at the same time, and the temperature calculation unit 142 measures the temperature previously obtained using the above equation or The temperature of the thermistor 130 is detected using a data table for
- the overheat protection control unit 141 suppresses the temperature rise of the components of the inverter 106 by limiting the current command value to a small value according to the temperature detection value Tm or stopping the motor drive. That is, as the temperature detection value Tm increases, the current command value (assist command) is restricted so as to decrease or the motor drive is stopped. The motor drive may be stopped when the temperature detection value Tm exceeds the predetermined value Tm2.
- the correlation value between the temperature rise of the component of the inverter 106 and the temperature detection value Tm is analyzed in advance by experiment etc., and a temperature larger than the temperature detection value Tm1 when any heat resistant temperature of the component is exceeded
- the overheat protection start temperature threshold temperature
- the present invention adjusts in the following manner. (1) As shown in FIG. 9, the width of the wiring pattern of the power supply line at the portion where the temperature detection element is disposed is made narrower than the width of the other portions. If the thickness of the wiring pattern is made uniform, the electrical resistance becomes large by narrowing the width, and the heat generation of the pattern is increased by the conduction current. In FIG. 9A, since the widths of the arrangement portion and the other portion are the same, the amount of heat generation of the temperature detection portion is small, and as shown in FIG.
- the heat generation amount of the temperature detection unit can be increased.
- the width may be the same and the thickness may be reduced.
- the heat generation amount of the temperature detection unit can be increased by reducing the thermal VIA of the wiring pattern of the power supply line as shown in FIG. 6, and conversely, by increasing the thermal VIA, the temperature detection unit The calorific value can be reduced.
- the amount of heat generated by the temperature detection unit can be adjusted by adjusting the amount of heat released from the circuit board of the wiring pattern to the case. That is, in FIG.
- the heat is dissipated to the back side of the position where the temperature detection element is disposed via the grease and the heat sink, so the amount of heat generation can be adjusted small, and in FIG. Since the heat dissipation material is not disposed on the rear side of the position where the temperature detection element is disposed, the amount of heat generation can be largely adjusted.
- the width of the wiring pattern may be increased as in FIGS. 10C and 10D (case 1) or the width of the wiring pattern may be narrowed (case 2) ). Further, the widths for cutting the above wiring patterns may be combined.
- the threshold temperature of the overheat protection can be easily designed, and the freedom of the threshold design of the overheat protection can be enhanced. It becomes possible to prevent the heat resistance temperature excess.
- FIG. 11 shows an example of the mounting arrangement of the temperature detection element of the present invention on the circuit board.
- the temperature detection element is arranged at the end of the circuit board. Conventionally, it has been arranged inside the circuit board. The reason is as follows.
- the heating elements are disposed on the circuit board of the power section, and the center is likely to be the point at which the temperature is the highest, and when the temperature detection element is disposed at the center of the power section, the distance from each element is average
- the temperature of each heating element can be obtained uniformly. In other words, it is to make it difficult for the distance to get too far and the temperature can not be picked up.
- the other elements are usually at or below that temperature. It is not necessary to arrange at the center of the substrate of the power circuit unit by detecting the temperature on the VR pattern which is not wired.
- a thermistor is taken as an example of a temperature sensor, but a temperature measuring resistor, a thermocouple, an IC temperature sensor utilizing temperature characteristics of a transistor, a crystal thermometer using Y cut of quartz, etc. It is also possible to use
- thermal VIA and grease are shown in the embodiment of the present invention, they are simply required for heat dissipation of the system, and are provided to assist heat transfer from the heat generating portion to the temperature detection element. It is not something that
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- Microelectronics & Electronic Packaging (AREA)
- Power Steering Mechanism (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
一般的に温度T0[K]の時のサーミスタ抵抗をR0とすると、温度T[K]の時のサーミスタ抵抗RZは、下記数4で表せる。
上記数4からサーミスタ抵抗RZが温度に依存し、数5からサーミスタ抵抗RZの測定によりサーミスタ温度T、つまりサーミスタ130が設置されている配線パターンの温度が得られることが分かる。本発明では周期的な検出ではなく、電源電圧VR(VRd)を測定してA/D変換するチャンネルCH1の検出と、サーミスタ130の分圧値V1を測定してA/D変換するチャンネルCH2の検出と、分圧回路144の分圧値V2を測定してA/D変換するチャンネルCH3の検出とを同時にサンプリングし、温度演算部142が上記演算式を用いて、或いは予め求めてある温度測定用のデータテーブルを用いてサーミスタ130の温度を検出する。
(1)図9に示すように、温度検出素子を配設する部位の、電源ラインの配線パターンの幅を他の部位の幅よりも狭くする。配線パターンの厚さは均一とすると、幅を狭くすることにより電気的抵抗が大きくなり、通電電流によりパターン発熱が上昇する。図9(A)は配設部位と他の部位との幅が同一になっているので温度検出部の発熱量が小さく、図9(B)に示すように、一端面側からV字状の凹部を設けてパターン幅を狭くすることにより、温度検出部の発熱量を大きくすることができる。同様な理論で、幅を同一にして、厚さを薄くするようにしても良い。
(2)図6に示すような電源ラインの配線パターンのサーマルVIAを少なくすることにより、温度検出部の発熱量を大きくすることができ、逆にサーマルVIAを多くすることにより、温度検出部の発熱量を小さくすることができる。
(3)図10に示すように配線パターンの回路基板からケースへの放熱量を調整することにより、温度検出部の発熱量を調整することができる。即ち、図10(A)では、温度検出素子の配設位置の裏側にグリース、ヒートシンクを介して放熱するようにしているので、発熱量を小さく調整することができ、図10(B)では、温度検出素子の配設位置の裏側には放熱材料が配置されていないので、発熱量を大きく調整することができる。
(4)図10(B)の形態で、図10(C)及び(D)のように配線パターンの幅を広くしたり(ケース1)、配線パターンの幅を狭くしても良い(ケース2)。また、上記配線パターンをカットする幅を組み合わせても良い。
上記方法(1)~(4)により、電源ラインの配線パターンの発熱量を調整することで、過熱保護の閾値温度を設計し易くし、過熱保護の閾値設計の自由度を高め、構成部品の耐熱温度超過を防ぐことが可能となる。
2 コラム軸(ステアリングシャフト、ハンドル軸)
10 トルクセンサ
12 車速センサ
20 モータ
100 コントロールユニット(ECU)
101 電流指令値演算部
104 PI制御部
105 PWM制御部
106、106A インバータ
110 補償信号生成部
120、130 サーミスタ
121 発熱部品
122-1~122-4 導体層
123-1~123-3 絶縁層
140 モータ駆動制御部
141 過熱保護制御部
142 温度検出部
143 電圧検出部
144 分圧回路
Claims (8)
- 電流指令値に基づいてインバータを介してモータを駆動制御するモータ制御装置において、
前記インバータに接続された電源の電源電圧を検出する電圧検出部と、
前記インバータ及び前記電源の間の、回路基板の配線パターン上に配置された温度検出素子と、
前記温度検出素子及び抵抗で前記電源電圧を分圧する分圧回路と、
前記分圧回路からの分圧電圧及び前記電圧検出部で検出された電圧検出値に基づいて、前記配線パターンの温度を検出する温度検出部と、
前記温度検出部の温度検出値に基づいて前記電流指令値を制限する過熱保護制御部と、
を備え、
前記温度検出部は、所定の演算式若しくは予め設定されたデータテーブルを用いて、前記電源電圧の影響を受けることなく前記配線パターンの温度を検出するようになっていることを特徴とするモータ制御装置。 - 前記回路基板において、前記温度検出素子が配置される前記インバータ及び前記電源の間の前記配線パターンの厚さが均一で、幅が他の部位の配線パターンの幅よりも狭くなっている請求項1に記載のモータ制御装置。
- 前記回路基板において、前記温度検出素子が配置される前記インバータ及び前記電源の間の前記配線パターンの幅が均一で、厚さが他の部位の配線パターンの幅よりも薄くなっている請求項1に記載のモータ制御装置。
- 前記温度検出素子が配置される前記インバータ及び前記電源の間の前記配線パターンが、前記回路基板の裏面若しくは内部又は近辺で放熱されない構造になっている請求項1乃至3のいずれかに記載のモータ制御装置。
- 前記回路基板の裏面に、サーマルVIA、グリース、ヒートシンクの少なくとも1つが配設されている請求項1乃至4のいずれかに記載のモータ制御装置。
- 前記回路基板が多層基板であり、前記多層基板の最外層に前記温度検出素子が設けられている請求項1乃至5のいずれかに記載のモータ制御装置。
- 前記温度検出素子がサーミスタである請求項6に記載のモータ制御装置。
- 請求項1乃至7のいずれかのモータ制御装置を搭載したことを特徴とする電動パワーステアリング装置。
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PCT/JP2017/032334 WO2019049284A1 (ja) | 2017-09-07 | 2017-09-07 | モータ制御装置及びそれを搭載した電動パワーステアリング装置 |
CN201780057891.6A CN109874383A (zh) | 2017-09-07 | 2017-09-07 | 电动机控制装置以及搭载了该电动机控制装置的电动助力转向装置 |
US16/320,771 US20200382013A1 (en) | 2017-09-07 | 2017-09-07 | Motor control unit and electric power steering apparatus equipped with the same |
EP17918689.5A EP3493390A4 (en) | 2017-09-07 | 2017-09-07 | MOTOR CONTROL DEVICE AND ELECTRICALLY ASSISTED STEERING DEVICE PROVIDED WITH SAID CONTROL DEVICE |
BR112019001979-0A BR112019001979A2 (pt) | 2017-09-07 | 2017-09-07 | unidade de controle de motor e aparelho de direção acionada por energia elétrica equipado com a mesma |
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JP7338816B1 (ja) * | 2022-05-20 | 2023-09-05 | 日本精工株式会社 | モータ制御装置及び電動パワーステアリング装置 |
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- 2017-09-07 CN CN201780057891.6A patent/CN109874383A/zh active Pending
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EP3493390A1 (en) | 2019-06-05 |
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