JP7254272B1 - MOTOR CONTROL SYSTEM, MOTOR CONTROL DEVICE, LIFE ESTIMATION METHOD, ELECTRIC VEHICLE - Google Patents

Abstract

A motor control system and the like capable of estimating the life of windings of a motor with higher accuracy. A motor control system (15) has a motor (3) having a winding (41) and a motor control device (5) for controlling the motor (3), and the motor control device (5) records specification information about the winding (41). and a calculation execution unit 63 that executes calculations related to the life of the winding 41 based on the specification information recorded in the specification information recording unit 61 . [Selection drawing] Fig. 8

Description

The disclosed embodiments relate to a motor control system, a motor control device, a life estimation method, and an electric vehicle.

Patent Literature 1 describes a method for calculating a winding life of an electric motor. In this winding life calculation method, the difference between the motor temperature obtained by the multi-protector relay connected to the motor and the maximum allowable temperature is reflected in the total operating time to calculate the remaining life of the motor.

JP-A-9-090005

In a system for controlling a motor, there has been a demand for a system capable of estimating the life of the windings of the motor with higher accuracy.

The present invention has been made in view of such problems, and provides a motor control system, a motor control device, a life estimation method, and an electric vehicle capable of estimating the life of windings provided in a motor with higher accuracy. intended to provide

In order to solve the above problems, according to one aspect of the present invention, there is provided a motor having windings, and a motor control device for controlling the motor, wherein the motor control device provides various A motor control system having an information recording unit that records original information and a calculation execution unit that executes calculations related to the life of the winding based on the specification information recorded in the information recording unit is applied be done.

Further, according to another aspect of the present invention, a motor having windings and a motor control device for controlling the motor are provided, and the motor control device controls the current flowing through the windings and the windings. A motor control system is applied, comprising: an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information of the winding when the temperature of the winding satisfies a predetermined condition.

According to another aspect of the present invention, there is provided a motor control device for controlling a motor having windings, comprising: an information recording unit for recording specification information about the windings; and a calculation execution unit that executes calculation related to the life of the winding based on the specification information.

According to another aspect of the present invention, there is provided a motor control device for controlling a motor having windings, wherein when the current flowing through the windings and the temperature of the windings satisfy predetermined conditions, A motor control device is applied that has an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information about the winding.

According to another aspect of the present invention, there is provided a life estimating method for estimating the life of windings provided in a motor, in which specification information about the windings recorded in a motor control device for controlling the motor is acquired. and performing a calculation related to the life of the winding based on the specification information.

According to another aspect of the present invention, there is provided a life estimation method for estimating the life of a winding provided in a motor, wherein when the current flowing through the winding and the temperature of the winding satisfy predetermined conditions, , performing a calculation related to the life of the winding based on the specification information about the winding.

According to another aspect of the present invention, a motor equipped with windings, a motor control device for controlling the motor, wheels driven by the motor, the motor and the motor control device are installed, a vehicle body that travels on the wheels, and the motor control device includes an information recording unit that records specification information about the windings, and based on the specification information recorded in the information recording unit, the and an arithmetic execution unit that executes an arithmetic operation related to the life of the winding.

According to another aspect of the present invention, a motor equipped with windings, a motor control device for controlling the motor, wheels driven by the motor, the motor and the motor control device are installed, and a vehicle body that travels on the wheels, wherein the motor control device controls, based on the specification information about the windings, when the current flowing through the windings and the temperature of the windings satisfy predetermined conditions. and an arithmetic execution unit that executes arithmetic operations related to the life of the winding.

According to the motor control system and the like of the present invention, it is possible to estimate the life of the windings of the motor with higher accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure showing an example of a schematic structure of the electric vehicle which concerns on embodiment. It is a longitudinal section showing an example of composition of a motor. 3 is a cross-sectional view corresponding to the III-III section in FIG. 2, showing an example of the configuration of the motor; FIG. FIG. 4 is an enlarged cross-sectional view of one tooth portion in FIG. 3 ; FIG. 2 is a cross-sectional view showing an example of a cross-sectional configuration of a copper wire that constitutes a winding; It is a block diagram showing an example of functional composition of a motor control device. 3 is a block diagram showing an example of a functional configuration related to motor control of a control unit; FIG. It is a block diagram showing an example of the functional composition regarding life estimation of a control part. 7 is a graph showing an example of coefficient setting by a coefficient setting unit; 4 is a graph showing an example of thermal conductivity in a slot calculated by a threshold calculator. 7 is a graph showing an example of an upper limit number of times in a slot calculated by a threshold calculation unit; 4 is a flow chart showing an example of a processing procedure executed by a control unit of a motor control device; FIG. 11 is a block diagram showing an example of a functional configuration related to life estimation of a control unit of a motor control device according to a modification; It is a graph showing an example of the maximum electric current value integrated by the 2nd integration processing part. It is a graph showing an example of the time integration value integrated by the second integration processing unit. 9 is a flow chart showing an example of a processing procedure executed by a control unit of a motor control device according to a modification; It is a block diagram showing an example of the hardware constitutions of a motor control device.

Hereinafter, embodiments will be described with reference to the drawings.

<1. Schematic configuration of electric vehicle>
An example of a schematic configuration of an electric vehicle according to an embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an example of a schematic configuration of an electric vehicle according to an embodiment.

As shown in FIG. 1 , the electric vehicle 1 has a motor 3 , a motor control device 5 , a battery 7 , a controller 9 , a plurality of (eg, four) wheels 11 , and a vehicle body 13 . The motor 3 , the motor control device 5 , the controller 9 and the like constitute a motor control system 15 .

The electric vehicle 1 is an electric vehicle (EV) equipped with a motor 3 for running. The electric vehicle 1 may be any vehicle provided with a motor for running, and in addition to an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV) with an added external charging function, fuel A battery vehicle (FCV) or the like may be used.

The motor 3 is a driving motor that drives some or all of the wheels 11 . In the example shown in FIG. 1, the motor 3 drives two wheels 11 on the front side of the vehicle body 13 . Motor 3 is, for example, a three-phase AC motor. Note that the motor 3 may be a motor having windings, and may be, for example, a synchronous motor or an induction motor, or may be an AC motor or a DC motor other than three-phase. In the example shown in FIG. 1, one motor 3 drives the wheels 11 , but the wheels 11 may be driven by a plurality of motors 3 . The motor 3 is cooled by, for example, a water-cooled or oil-cooled cooling device (not shown).

The motor control device 5 includes, for example, a control unit 17 (see FIG. 6 described later) having an arithmetic unit (CPU), a recording device, an input device, etc., and an inverter unit 19 (see FIG. 6 described later) that supplies power to the motor 3. etc. The inverter unit 19 converts DC power supplied from the battery 7 into AC power of any frequency, current, and voltage by switching a semiconductor switch, for example. The motor control device 5 supplies AC power to the motor 3 based on the control command received from the controller 9 and controls the operation of the motor 3 .

A battery 7 supplies DC power to the motor controller 5 . As the battery 7, for example, a lithium ion battery or the like is used. Note that other types of batteries may be used.

The controller 9 is a control device that controls the electric vehicle 1 as a whole. The controller 9 transmits a control command for controlling the motor 3 to the motor control device 5 based on the amount of displacement of the accelerator pedal and the brake pedal operated by the driver, the switching input of the shift lever, and the like. A control command is, for example, a torque command. The controller 9 is a computer having, for example, an arithmetic unit (CPU), a recording device, an input device, and the like.

For example, four wheels 11 are provided on the vehicle body 13 , and some or all of them are driven by the motor 3 . In the example shown in FIG. 1, the two wheels 11 on the front side are driven by the motor 3, but the two wheels 11 on the rear side may be driven, or all four wheels 11 may be driven. may be

The vehicle body 13 is equipped with the motor 3 , the motor control device 5 , the battery 7 , the controller 9 , and the like, and runs on the wheels 11 .

<2. Configuration of Motor and Windings>
An example of the configuration of the motor 3 and the windings 41 will be described with reference to FIGS. 2 to 5. FIG. 2 is a vertical sectional view showing an example of the configuration of the motor 3, FIG. 3 is a horizontal sectional view corresponding to the III-III section of FIG. 2, FIG. 4 is an enlarged sectional view of one split core in FIG. 3, and FIG. 4 is a cross-sectional view showing an example of a cross-sectional structure of an electric wire forming a winding; FIG. Note that illustration of the rotor is omitted in FIG.

As shown in FIG. 2 , the motor 3 has a stator 21 , a rotor 23 , a frame 25 , brackets 27 and 29 , bearings 31 and 33 and a temperature detector 35 .

The stator 21 is provided on the inner circumference of the frame 25 . The stator 21 has a stator core 39 , windings 41 and resin 43 . As shown in FIG. 3, the stator core 39 is annularly formed by connecting a plurality of split cores 39a in the circumferential direction. As shown in FIGS. 3 and 4, the stator core 39 has slots 39b opening radially inward between adjacent split cores 39a. As shown in FIG. 4, the windings 41 are attached to the tooth portions 39c of the split core 39a via insulators 42 made of an insulating material, and both sides in the circumferential direction are accommodated inside the slots 39b. be. Inside the slot 39b, the sides of the windings 41 that are adjacent in the circumferential direction are arranged facing each other with a slight gap. The resin 43 is made of an insulating material and is molded, for example, into a predetermined shape so as to cover each winding 41 . The resin 43 fills the inside of each slot 39b so as to insulate the windings 41 adjacent in the circumferential direction.

As shown in FIG. 2 , the rotor 23 has a shaft 37 and a rotor core 45 provided on the outer circumference of the shaft 37 . The rotor core 45 is arranged so as to radially face the stator core 39 .

The bracket 27 is arranged on the load side of the frame 25 (right side in FIG. 2), and the bracket 29 is arranged on the anti-load side of the frame 25 (left side in FIG. 2). The "load side" is the direction in which a load (for example, a speed reducer, etc.) is attached to the motor 3, for example, the direction in which the shaft 37 protrudes in FIG. "Anti-load side" is the direction opposite the load side. Bearing 31 is fixed to bracket 27 and bearing 33 is fixed to bracket 29 . Shaft 37 is rotatably supported by bearings 31 and 33 .

The temperature detector 35 is installed near the stator 21 and detects the temperature of the windings 41 . A thermistor, for example, is used as the temperature detection unit 35 . However, other types of temperature sensors may be used.

As shown in FIGS. 4 and 5, the winding 41 is configured by winding an electric wire 40 (for example, a copper wire or the like). As shown in FIG. 5, the electric wire 40 includes a linear conductor portion 40a made of a conductive material (such as copper) and an insulating material (such as enamel). and a portion 40b.

<3. Functional Configuration of Motor Control Device>
An example of the functional configuration of the motor control device 5 will be described with reference to FIG. FIG. 6 is a block diagram showing an example of the functional configuration of the motor control device 5. As shown in FIG.

As shown in FIG. 6 , the motor control device 5 has the control section 17 and the inverter section 19 described above, and the current detection section 47 .

The inverter unit 19 converts the DC power supplied from the battery 7 into AC power based on the control signal Cs from the control unit 17 and supplies the AC power to the motor 3 to drive the motor 3 . The control signal Cs is, for example, a PWM signal.

The control section 17 controls the inverter section 19 based on a control command (for example, torque command Tr) from the controller 9 . Also, the control unit 17 estimates the life related to the insulation of the winding 41 based on the current detected by the current detection unit 47 and the temperature detected by the temperature detection unit 35 .

The current detection unit 47 detects the current supplied from the inverter unit 19 to the motor 3 , that is, the current I flowing through the windings 41 of the motor 3 and transmits the detected current I to the control unit 17 . As the current detector 47, for example, a CT-type current sensor or the like is used. However, other types of current sensors may be used. Also, the current detection unit 47 may be installed outside the motor control device 5 instead of inside the motor control device 5 .

The temperature detector 35 detects the temperature T of the windings 41 of the motor 3 and transmits it to the controller 17 .

The rotational position detector 49 optically or magnetically detects the rotational angle θ of the motor 7 and transmits it to the controller 17 . As the rotational position detector 49, for example, an optical or magnetic encoder or the like is used. However, other types of rotational position sensors may be used.

<4. Functional Configuration Related to Motor Control of Control Unit>
An example of a functional configuration related to motor control of the control unit 17 will be described with reference to FIG.

As shown in FIG. 7 , the control section 17 has a torque control section 51 , a current control section 53 , a PWM control section 55 and a current conversion section 57 .

The torque control unit 51 generates a current command Iref (for example, a q-axis current command Iqref for the q-axis component and a d-axis current command Idref for the d-axis component) based on the torque command Tr received from the controller 9 .

The current conversion unit 57 converts the current I received from the current detection unit 47 (for example, three-phase currents Iu, Iv, and Iw) to the current I (for example, Coordinate transformation is performed to the q-axis current Iq of the q-axis component and the d-axis current Id of the d-axis component.

The current control unit 53 outputs a voltage command V (for example, the q-axis A component q-axis voltage command Vq and a d-axis component d-axis voltage command Vd) are generated. Next, the current control unit 53 coordinate-converts the voltage command V into, for example, U-phase, V-phase, and W-phase voltage commands based on the rotation angle θ of the motor 3 received from the rotation position detector 49. A voltage command V (a U-phase voltage command Vu, a V-phase voltage command Vv, and a W-phase voltage command Vw) is generated and output to the PWM control unit 55 .

The PWM control unit 55 performs PWM conversion based on the voltage command V input from the current control unit 53 to generate, for example, a PWM signal Cs corresponding to each of the U-phase, V-phase, and W-phase, and outputs it to the inverter unit 19. do.

The inverter unit 19 performs a switching operation based on the PWM signal Cs, converts the DC power supplied from the battery 7 into three-phase AC power, for example, U-phase, V-phase, and W-phase, by PWM control, and supplies the power to the motor 3. supply. A current I (Iu, Iv, Iw) of the AC power supplied from the inverter unit 19 is detected by the current detection unit 47 and transmitted to the current conversion unit 57 .

As described above, the motor control device 5 forms a feedback loop for current control (torque control). As a result, the current supplied from the motor controller 5 to the motor 3 is controlled so as to follow the torque command input to the motor controller 5 .

<5. Functional Configuration Related to Life Estimation of Control Unit>
An example of a functional configuration related to life estimation of the control unit 17 will be described with reference to FIG. 8 .

As shown in FIG. 8 , the control section 17 has an information input section 59 , a specification information recording section 61 , an arithmetic execution section 63 and a first warning output section 65 .

The information input unit 59 inputs the current I flowing through the windings 41 of the motor 3 detected by the current detection unit 47 and the temperature T of the windings 41 of the motor 3 detected by the temperature detection unit 35 .

The specification information recording unit 61 (an example of the information recording unit) records various kinds of specification information regarding the windings 41 of the motor 3 . The specification information includes, for example, the space factor and filling factor of the windings 41 . The space factor is the ratio of the cross-sectional area of the wire 40 to the cross-sectional area of the slot 39b in which the winding wire 41 is accommodated. The filling rate is the ratio of the cross-sectional area of the portion other than the air bubbles to the cross-sectional area of the resin 43 covering the winding 41 .

Note that the specification information recording unit 61 may record specification information on windings for a plurality of models of motors. In this case, the specification information on the windings of all motor models provided by the motor maker may be recorded, or the model of the motor to be controlled may be limited based on the rated output capacity of the motor control device 5. You may record the specification information of the winding which carried out. When the specification information about a plurality of models of motors is recorded in the specification information recording unit 61, the user may select which model of motor the specification information is to be used.

Further, when the motor control device 5 is updated, the specification information recorded in the specification information recording unit 61 of the motor control device 5 before the update and the number of times (count value) can be handed over to the specification information recording unit 61 and the first integration processing unit 69 of the updated motor control device 5, respectively.

When the current flowing through the winding 41 and the temperature of the winding 41 satisfy predetermined conditions, the calculation execution unit 63 performs winding operation based on the specification information about the winding 41 recorded in the specification information recording unit 61. Calculations relating to the life of line 41 are performed. In the present embodiment, as "computation relating to the life of the winding 41", computation processing for counting the number of times the predetermined condition is satisfied is performed. Calculation execution unit 63 has coefficient setting unit 67 , first integration processing unit 69 , first threshold value calculation unit 71 , and first life estimation unit 73 .

The coefficient setting unit 67 sets the coefficient based on the current flowing through the winding 41 and the detected value of the current detecting unit 47 while the temperature of the winding 41 satisfies a predetermined condition. Specifically, the coefficient setting unit 67 sets the detection value of the current detection unit 47 to be equal to or greater than the current threshold Ish (an example of the first threshold), and the detection value of the temperature detection unit 35 to the temperature threshold Tsh (second threshold). Example of threshold value) A coefficient is set based on the maximum value of the detection value of the current detection unit 47 (hereinafter referred to as “maximum current value” as appropriate) while it is below. The "coefficient" is a numerical value multiplied by the first integration processing unit 69 when counting the number of times, and the larger the coefficient, the larger the count value of the number of times when a predetermined condition is satisfied. For example, if the coefficient is 1, it is counted as 1 time when the predetermined condition is met once, but if the coefficient is 2, it is counted as 2 times when the predetermined condition is met once. be done. That is, the coefficient setting unit 67 weights the number of counts so that the larger the maximum current value, the longer the life consumed.

FIG. 9 shows an example of coefficient setting by the coefficient setting unit 67 . Note that FIG. 9 shows setting examples of coefficients for two types of windings (for example, 50% and 60%) having different filling rates of the resin 43 . As shown in FIG. 9, the coefficient is set to increase, for example, exponentially as the maximum current value increases. This is because the larger the current that flows, the greater the amount of heat generated by the conducting wire portion 40a, and the greater the temperature difference between the conducting wire portion 40a and the coating portion 40b, and the greater the stress that the coating portion 40b receives. Further, when the maximum current value is the same, the coefficient is set so as to increase as the filling rate of the resin 43 decreases. This is because when the filling rate of the resin 43 is small, a large number of air bubbles are contained, so that the heat conductivity in the slot 39b becomes small. , the temperature difference between the conductor portion 40a and the coating portion 40b increases, and the stress that the coating portion 40b receives increases.

In the above description, the coefficient is set based on the maximum current value while the value detected by the current detection unit 47 is equal to or higher than the current threshold Ish and the value detected by the temperature detection unit 35 is equal to or lower than the temperature threshold Tsh. The coefficient is not limited to the maximum value, and may be set based on, for example, an average value or integrated value of the detected values during the above period.

Returning to FIG. 8, the first integration processing unit 69 integrates the number of times that the current flowing through the winding 41 and the temperature of the winding 41 satisfy a predetermined condition. Specifically, the first integration processing unit 69 counts and integrates the number of times the detection value of the current detection unit 47 becomes equal to or greater than the current threshold Ish and the detection value of the temperature detection unit 35 becomes equal to or less than the temperature threshold Tsh. do. At this time, the first integration processing unit 69 multiplies the coefficient set by the coefficient setting unit 67 to count the number of times. For example, when the coefficient is 1, it is counted as 1 time when the predetermined condition is met once, but when the coefficient is 2, it is counted as 2 times when the predetermined condition is met once. .

The first threshold calculation unit 71 calculates an upper limit number of times Nmax (an example of a third threshold) for estimating the life of the winding 41 based on the specification information about the winding 41 recorded in the specification information recording unit 61. Calculate The first threshold calculator 71 calculates the upper limit count Nmax, for example, as follows.

Assuming that the cross-sectional area of the slot 39b is Sslot, the space factor of the winding 41 is Kspf, and the filling factor of the resin 43 is Kmol, the cross-sectional area of the winding 41 is Scoil, the cross-sectional area of the resin 43 is Smol, and the cross-sectional area of the bubble is Sair. It is obtained by the following equations (1) to (3).

Scoil=Kspf×Sslot (1)
Smol=(1−Kspf)×Sslot (2)
Sair=(1−Kmol)×Smol (3)

Let λcoil be the thermal conductivity of the winding 41, λmol be the thermal conductivity of the resin 43, and λair be the thermal conductivity of the air bubble.

λ=(λcoil×Scoil/Sslot)+(λmol×Smol/Sslot)+(λair×Sair/Sslot) (4)

FIG. 10 shows an example of the thermal conductivity λ inside the slot 39b calculated by the above formula (4). As shown in FIG. 10, the thermal conductivity λ inside the slot 39b increases exponentially, for example, as the space factor increases. This is because the wire 40 of the winding 41 has a higher thermal conductivity than the resin 43 and air bubbles. Further, when the space factor is the same, the thermal conductivity λ increases as the filling factor of the resin 43 increases. This is because as the filling rate of the resin 43 increases, the number of air bubbles having a lower thermal conductivity than the wires 40 and the resin 43 decreases in the slot 39b.

Assuming that the thermal conductivity in the slot 39b is λ, the deterioration coefficient for the thermal conductivity is N, the basic current is Iref, the number of times of deterioration at the basic current is Nref, and the current threshold is Ish, the upper limit number of times Nmax is given by the following equation (5). Desired. Note that the basic current Iref is a reference value of the current flowing through the winding 41, and for example, the rated current value of the winding 41 may be used.

Nmax=Nref×f((Ish/Iref) ^(2×Nλ) ) (5)

FIG. 11 shows an example of the upper limit number of times Nmax in the slot 39b calculated by the above equation (5). As shown in FIG. 11, the upper limit number Nmax decreases as the current value (basic current Iref) increases. This is because the larger the current that flows, the greater the amount of heat generated by the conducting wire portion 40a, and the greater the temperature difference between the conducting wire portion 40a and the coating portion 40b, and the greater the stress that the coating portion 40b receives. Further, when the maximum current value is the same, the upper limit number of times Nmax increases as the filling rate of the resin 43 increases. This is because when the filling rate of the resin 43 is high, the number of air bubbles decreases and the heat conductivity in the slot 39b increases. This is because the temperature difference generated between the portion 40a and the coating portion 40b is reduced, and the stress received by the coating portion 40b is reduced. Therefore, the upper limit number of times Nmax, which is an index of the life of the winding 41, increases as the current decreases, and increases as the filling rate of the resin 43 increases.

Returning to FIG. 8, the first life estimation unit 73 estimates the life of the winding 41 based on the number of times integrated by the first integration processing unit 69 and the upper limit number of times Nmax calculated by the threshold value calculation unit 71. presume. For example, when the integrated value of the number of times exceeds the upper limit number of times Nmax, the first life estimation unit 73 estimates that the winding 41 has reached the end of its life. It can be estimated that the winding 41 has not reached the end of its life.

The first warning output unit 65 issues a warning related to the life of the winding 41 ( warning or alarm) is output. Various modes of outputting the warning by the first warning output unit 65 can be considered. Alternatively, it may be transmitted to an external output device (not shown) communicatively connected to the motor control device 5, for example.

The information input unit 59, the specification information recording unit 61, the calculation execution unit 63, the first warning output unit 65, the coefficient setting unit 67, the first integration processing unit 69, the first threshold value calculation unit 71, and the first life estimation unit described above 73 and the like are not limited to these examples of division of processing, and may be processed by a smaller number of processing units (for example, one processing unit), or may be further subdivided. may be processed by a separate processing unit. The above processing and the like of the control unit 17 may be implemented by a program executed by the CPU 901 (see FIG. 17), which will be described later, or part or all of it may be implemented by an actual device such as an ASIC, FPGA, or other electric circuit. may be

<6. Processing Procedure of Control Unit>
An example of the processing procedure executed by the control unit 17 of the motor control device 5 will be described with reference to FIG. 12 .

In step S<b>10 , the control unit 17 inputs the detected value of the current flowing through the winding 41 (current I) from the current detection unit 47 through the information input unit 59 . Input of the current I is continuously performed at predetermined time intervals, for example.

In step S<b>20 , the control unit 17 inputs the temperature detection value (temperature T) of the winding 41 from the temperature detection unit 35 through the information input unit 59 . The temperature T is continuously input, for example, at predetermined time intervals.

In step S<b>30 , the control unit 17 uses the calculation execution unit 63 to determine whether the current I is greater than or equal to the current threshold Ish and the temperature T is less than or equal to the temperature threshold Tsh. If the above conditions are not met, that is, if the current I is less than the current threshold Ish or the temperature T is higher than the temperature threshold Tsh (step S30: NO), the process returns to step S10. On the other hand, when the above conditions are satisfied, the process proceeds to the next step S40.

In step S40, the control unit 17 causes the calculation execution unit 63 to determine whether or not the condition of step S30 is no longer satisfied. Specifically, it is determined at least one of whether or not the current I has become less than the current threshold Ish, or whether or not the temperature T has become higher than the temperature threshold Tsh. This step S40 is repeated while the condition of step S30 is satisfied (step S40: NO), and when the condition of step S30 is no longer satisfied (step S40: YES), the process proceeds to the next step S50.

In step S50, the control unit 17 causes the coefficient setting unit 67 to set the maximum value ( Set the coefficient based on the maximum current value).

In step S60, the control unit 17 causes the first integration processing unit 69 to determine the number of times the current I becomes equal to or greater than the current threshold Ish and the temperature T becomes equal to or less than the temperature threshold Tsh based on the coefficient set in step S50. are counted and accumulated. The accumulated number of times (count value) is recorded in appropriate recording means (such as recording device 917, see FIG. 17 described later).

In step S70, the control unit 17 causes the first life estimation unit 73 to determine whether or not the number of times accumulated in step S60 is equal to or greater than the upper limit number of times Nmax. The upper limit number of times Nmax is calculated based on the specification information about the winding 41 by the first threshold calculation unit 71 in step S70 or at an appropriate timing. If the number of times is less than the upper limit number of times Nmax (step S70: NO), it is estimated that the winding 41 has not reached the end of its life, that is, the deterioration of the insulation of the winding 41 is within the allowable range, and the previous step Returning to S10, the same procedure is repeated. On the other hand, if the number of times is equal to or greater than the upper limit number of times Nmax (step S70: YES), it is estimated that the winding 41 has reached the end of its life, that is, the deterioration of the insulation of the winding 41 has exceeded the allowable range. Go to step S80.

In step S<b>80 , the control unit 17 outputs a warning regarding the life of the winding 41 using the first warning output unit 65 . This completes the flowchart.

The processing procedure described above is an example, and at least part of the above procedure may be deleted or changed, and procedures other than the above may be added. The order of at least some of the above procedures may be changed, and multiple procedures may be combined into a single procedure.

<7. Effect of Embodiment>
As described above, the motor control system 15 of this embodiment includes the motor 3 having the windings 41 and the motor control device 5 that controls the motor 3. The motor control device 5 controls the windings 41 a specification information recording unit 61 that records specification information about have.

The winding 41 is formed by winding an electric wire 40, and the electric wire 40 has a conductor portion 40a and a coating portion 40b made of an insulating material. When a current flows through the electric wire 40, the conducting wire portion 40a expands due to heat generation, but the covering portion 40b receives stress due to the difference in coefficient of thermal expansion between the conducting wire portion 40a and the covering portion 40b. By repeatedly receiving such stress, the coating portion 40b is fatigued and the insulation deteriorates, causing the motor 3 to malfunction. For this reason, it has been required to estimate the life associated with the insulation of the winding 41 with high accuracy.

In order to estimate the life of the windings 41 with high accuracy, there are cases where specification information regarding the windings 41 that is not open to the public, such as the space factor and filling factor of the windings 41, is required. In this embodiment, such specification information is recorded in the specification information recording section 61 of the motor control device 5 . Therefore, the service life of the windings 41 can be estimated with higher accuracy by performing calculations based on the recorded specification information in the calculation execution unit 63 of the motor control device 5 . As a result, by informing the user in advance before the winding 41 reaches the estimated service life, it is possible to take countermeasures such as replacing the motor 3 or the winding 41 before the motor 3 fails. Therefore, the burden on the user can be reduced, and the product value can be increased.

In addition, the motor control system 15 of the present embodiment includes a motor 3 having a winding 41 and a motor control device 5 that controls the motor 3. The motor control device 5 controls current flowing through the winding 41 and It has a calculation execution unit 63 that executes a calculation related to the life of the winding 41 based on the specification information on the winding 41 when the temperature of the winding 41 satisfies a predetermined condition.

When current flows through the electric wire 40 forming the winding 41, the conductor portion 40a expands due to heat generation, and the coating portion 40b receives stress due to the difference in thermal expansion coefficient between the conductor portion 40a and the coating portion 40b. In particular, when a large current flows while the temperature of the winding 41 is low (for example, when the electric vehicle 1 is rapidly accelerated while the motor 3 is not sufficiently warmed up), the lead wire portion 40a and the coating portion 40b, a sharp temperature difference occurs, and the coating portion 40b receives a large stress. When the motor 3 is repeatedly operated under such conditions that the windings 41 are subjected to a particularly large stress, deterioration of the insulation of the coating portion 40b is accelerated. Therefore, in order to estimate the life of the windings 41 with high precision, it is desirable to consider the actual operating conditions of the motor 3 .

In this embodiment, when the current flowing through the windings 41 and the temperature of the windings 41 satisfy predetermined conditions, calculations relating to the life of the windings 41 are executed. As a result, it becomes possible to perform the calculation when the winding 41 satisfies the conditions under which the winding 41 receives a particularly large stress as described above, and to estimate the life of the winding 41 in accordance with the actual operating conditions of the motor 3. It becomes possible. Therefore, the life of winding 41 can be estimated with higher accuracy.

Further, in the present embodiment, the specification information may include at least one of the space factor and the filling factor of the windings 41 .

Generally, the space factor, filling factor, etc. of the winding 41 are not open to the public, and are information that cannot be grasped unless, for example, inquiries are made to the winding manufacturer. In this embodiment, such specification information is recorded in the specification information recording unit 61 of the motor control device 5, so that the calculation execution unit 63 of the motor control device 5 can By performing the calculation, the life of the winding 41 can be estimated with high accuracy. As a result, the user can grasp the life of the highly accurate winding 41 without inquiring to the winding manufacturer or the like.

In this embodiment, the motor control device 5 also has an information input unit 59 for inputting detection values from the current detection unit 47 that detects the current flowing through the winding 41 and the temperature detection unit 35 that detects the temperature of the winding 41. In that case, the calculation execution unit 63 integrates the number of times the detection value of the current detection unit 47 is equal to or greater than the current threshold Ish and the detection value of the temperature detection unit 35 is equal to or less than the temperature threshold Tsh. and a first life estimation unit 73 that estimates the life of the winding 41 based on the accumulated number of times and the upper limit number of times Nmax.

In this case, the number of times the winding 41 satisfies the condition of receiving a large stress can be accumulated. By setting the upper limit number of times Nmax at which the winding 41 can tolerate the above conditions as a threshold value, the upper limit number of times Nmax becomes an index of the life of the winding 41 . Therefore, for example, when the accumulated number of times exceeds the upper limit number of times Nmax, the winding 41 has reached the end of its life. It can be assumed that no

Further, in the present embodiment, the calculation execution section 63 may have a first threshold calculation section 71 that calculates the upper limit number of times Nmax based on the specification information regarding the winding 41 .

In this case, the upper limit number of times Nmax, which is an index of the life related to the insulation of the winding 41, can be set to an appropriate value by calculating using the specification information of the winding 41. FIG.

Further, in the present embodiment, the calculation execution unit 63 controls the current detection unit 47 while the detection value of the current detection unit 47 is equal to or higher than the current threshold Ish and the detection value of the temperature detection unit 35 is equal to or lower than the temperature threshold Tsh. may have a coefficient setting unit 67 that sets a coefficient based on the maximum value of the detected values of , and in that case, the first integration processing unit 69 may count the number of times based on the coefficient.

When the current value becomes equal to or higher than the current threshold value Ish and the temperature becomes equal to or lower than the temperature threshold value Tsh, and the condition that the winding 41 is subjected to a large stress is satisfied, depending on how much the current value rises The magnitude of the stress that the windings 41 receive is different. For example, when the current value is relatively high, the damage to the coating portion 40b is greater than when the current value is relatively low, resulting in a shorter life.

In the present embodiment, a coefficient is set based on the maximum current value while the winding 41 satisfies the condition of receiving a large stress, and the number of times the winding 41 satisfies the condition is counted based on the coefficient. As a result, the number of counts can be changed according to the magnitude of the maximum current value, so the life of the winding 41 can be estimated with higher accuracy according to the actual operating conditions.

Further, in the present embodiment, the motor control device 5 may have a first warning output unit 65 that outputs a warning regarding the life of the winding 41 when the accumulated number of times exceeds the upper limit number of times Nmax.

In this case, since the user can be notified in advance before the winding 41 reaches the estimated end of life, the user can feel secure and the reliability can be improved. In addition, since the user can take countermeasures such as replacing the motor 3 or the winding 41 before the motor 3 fails, the burden on the user can be reduced and the product value can be increased.

Further, the electric vehicle 1 of the present embodiment includes a motor 3 having a winding 41, a motor control device 5 that controls the motor 3, wheels 11 driven by the motor 3, the motor 3 and the motor control device 5. The motor control device 5 includes a specification information recording unit 61 for recording specification information about the windings 41 and a specification information recording unit 61 for recording the specification information recorded in the specification information recording unit 61. and an arithmetic execution unit 63 that executes an arithmetic operation related to the life of the winding 41 based on the specification information.

Generally, a motor for an electric vehicle is often operated at a maximum torque or a torque close to it when the vehicle body is accelerated. In addition, motors are also required to be downsized in order to be easily mountable on a vehicle body, and the current flowing through the windings is relatively large compared to, for example, general industrial motors. Therefore, the current density flowing through the windings is set high. On the other hand, since motors for electric vehicles are generally cooled by water cooling or oil cooling, they have a high cooling capacity. However, cooling by water cooling or oil cooling is effective when the motor is operated with continuous torque, but is less effective when it is operated instantaneously with maximum torque or the like. For this reason, for example, when the current density in the conducting wire portion rises sharply and heat is generated when the operation is performed at maximum torque, etc., when the temperature of the winding is low due to cooling, etc., the A steep temperature difference occurs between the two parts, and the coating part receives a large stress. When such stress is repeatedly applied to the coating, the insulation deteriorates due to fatigue, and the failure of the motor is detected and the motor is stopped during operation. In that case, the vehicle will stop on the spot, placing a burden on the user and lowering the product value. For this reason, it has been required to estimate the life associated with the insulation of windings with high accuracy.

In order to estimate the life of the windings with high accuracy, it may be necessary to obtain specification information about the windings, such as the space factor and filling factor of the windings, which is not disclosed to users. In this embodiment, such specification information is recorded in the specification information recording section 61 of the motor control device 5 . Therefore, the service life of the windings 41 can be estimated with higher accuracy by performing calculations based on the recorded specification information in the calculation execution unit 63 of the motor control device 5 . As a result, by informing the user in advance before the winding 41 reaches the estimated lifetime, measures such as replacing the motor 3 or the winding 41 before the motor 3 fails and the electric vehicle 1 stops. Since it becomes possible to take the above, it is possible to reduce the burden on the user and increase the product value.

Further, the electric vehicle 1 of the present embodiment includes a motor 3 having a winding 41, a motor control device 5 that controls the motor 3, wheels 11 driven by the motor 3, the motor 3 and the motor control device 5. and a vehicle body 13 mounted on the vehicle and traveling by the wheels 11, and the motor control device 5 determines the specifications of the winding 41 when the current flowing through the winding 41 and the temperature of the winding 41 satisfy predetermined conditions. It has an arithmetic execution unit 63 that executes an arithmetic operation related to the life of the winding 41 based on the information.

When the temperature of the windings 41 of the motor 3 is low and the motor 3 is operated at the maximum torque or a torque close to it (for example, when the electric vehicle 1 is rapidly accelerated while the motor 3 is not sufficiently warmed up), the coating portion Insulation deterioration of 40b is accelerated. Therefore, in order to estimate the life of the windings 41 with high precision, it is desirable to consider the actual operating conditions of the motor 3 .

In this embodiment, when the current flowing through the windings 41 and the temperature of the windings 41 satisfy predetermined conditions, calculations relating to the life of the windings 41 are executed. As a result, it becomes possible to perform the calculation when the winding 41 satisfies the conditions under which the winding 41 receives a particularly large stress as described above, and to estimate the life of the winding 41 in accordance with the actual operating conditions of the motor 3. It becomes possible. Therefore, the life of winding 41 can be estimated with higher accuracy.

<8. Variation>
The disclosed embodiments are not limited to the contents described above, and various modifications are possible without departing from the gist and technical ideas thereof.

For example, in the above-described embodiment, as an example of "calculation related to the life of the winding 41", the case of accumulating the number of times a predetermined condition is satisfied has been described, but the calculation is not limited to accumulating the number of times. For example, a current value while a predetermined condition is satisfied, or a time integral value obtained by integrating the current value while the predetermined condition is satisfied may be accumulated. The details of this modification will be described below.

FIG. 13 shows an example of a functional configuration related to life estimation of the control unit 17 of the motor control device 5 according to this modification. In FIG. 13, the same components as in FIG. 8 described above are given the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 13 , the control section 17 has the information input section 59 and the specification information recording section 61 described above, an arithmetic execution section 75 and a second warning output section 77 .

The information input unit 59 inputs the current I flowing through the windings 41 of the motor 3 detected by the current detection unit 47 . Note that the temperature T of the windings 41 of the motor 3 detected by the temperature detector 35 may also be input, as in the above-described embodiment.

When the current flowing through the winding 41 satisfies a predetermined condition, the calculation execution unit 75 determines the service life of the winding 41 based on the specification information about the winding 41 recorded in the specification information recording unit 61. perform an operation. The predetermined condition is that the detected value of the current detector 47 is equal to or greater than the current threshold Ish. As in the above-described embodiment, the predetermined condition may be that the detected value of the current detector 47 is equal to or higher than the current threshold Ish and the detected value of the temperature detector 35 is equal to or lower than the temperature threshold Tsh. In this modified example, as the "calculation related to the life of the winding 41", the current value while the predetermined condition is satisfied, or the time integration obtained by integrating the current value while the predetermined condition is satisfied Performs arithmetic processing for accumulating values. Calculation executing portion 75 has a second integration processing portion 79 , a second threshold value calculating portion 81 , and a second life estimating portion 83 .

The second integration processing unit 79 integrates the detection value of the current detection unit 47 or the time integration value obtained by integrating the detection value of the current detection unit 47 over time while the detection value of the current detection unit 47 is equal to or greater than the current threshold value Ish. is accumulated.

FIG. 14 shows an example of the time integral value integrated by the second integration processing section 79. As shown in FIG. FIG. 14 shows an example of changes in the current I while the electric vehicle 1 is running. In the example shown in FIG. 14, the current I becomes equal to or greater than the current threshold Ish at time t11, becomes equal to or less than the current threshold Ish at time t12, becomes equal to or greater than the current threshold Ish at time t21, becomes equal to or less than the current threshold Ish at time t22, and becomes equal to or less than the current threshold Ish at time t31. It becomes equal to or greater than the threshold Ish, and becomes equal to or less than the current threshold Ish at time t32. In this case, the second integration processing section 79 calculates the integrated value totalI of the time integrated values based on, for example, the following equations (6) to (9).

Note that f(I1) is the current value during the period from time t11 to t12 (the value detected by the current detection unit 47), intI1 is the time integration value of the current value during this period, and f(I2) is the current value during the period from time t21 to t22. current value, intI2 is the time integrated value of the current value in the period, f(I3) is the current value in the period from time t31 to t32, intI3 is the time integrated value of the current value in the period, totalI is the integrated value of the time integrated value is. The time integral values intI1, intI2, and intI3 correspond to the area of the hatched regions in FIG.

As shown in FIG. 15, time integrated values intI1, intI2, and intI3 of portions where the current I exceeds the current threshold Ish may be integrated. In this case, the above formulas (6) to (8) are as follows.

Note that the second integration processing unit 79 may integrate the current value itself instead of integrating the time integral value obtained by integrating the current value over time as described above. In this case, for example, the maximum value of the current value in a period in which a predetermined condition is satisfied (a period in which the current value is equal to or greater than the current threshold Ish) may be integrated, or the average value of the current value in the period may be integrated. good.

Returning to FIG. 13 , the second threshold calculation unit 81 calculates the upper limit limI of the integrated value of the current value (an example of the fourth threshold) or the upper limit limI of the integrated value of the time integral value ( An example of the fourth threshold) is calculated. Specifically, the second threshold calculator 81 obtains, for example, a temperature rise due to an increase in current by actual measurement or simulation, and grasps the relationship between current and temperature (relational expression between current and temperature). At this time, the relationship between current and temperature may be calculated based on the space factor, filling factor, or the like of the windings 41 . Regarding the thermal deterioration of the insulating material due to the temperature rise, the second threshold calculation unit 81 calculates the progress of deterioration of the insulating material (for example, the physical properties of the insulating material (changes in strength, electrical characteristics, etc.) are grasped by accelerated tests. The second threshold calculator 81 converts the result into an integrated current from the relationship between the current, the temperature, and the deterioration time obtained from the acceleration test, and calculates the upper limit value limI. The upper limit value limI calculated by the second threshold calculator 81 is recorded in the specification information recording unit 61 .

なお、ｋは反応速度定数、Ａは定数、Ｅａは活性化エネルギー、Ｒは気体定数、Ｔは絶対温度（Ｋ）である。

Here, k is the reaction rate constant, A is the constant, Ea is the activation energy, R is the gas constant, and T is the absolute temperature (K).

The second life estimation unit 83 estimates the life of the winding 41 based on the integrated value totalI integrated by the second integration processing unit 79 and the upper limit value limI calculated by the second threshold value calculation unit 81. do. For example, when the integrated value totalI exceeds the upper limit value limI, the second life estimation unit 83 estimates that the winding 41 has reached the end of its life. 41 has not reached the end of its life.

The second warning output unit 77 outputs a signal related to the life of the winding 41 when the integrated value totalI integrated by the second integration processing unit 79 exceeds the upper limit value limI calculated by the second threshold value calculation unit 81. Output a warning (may be warning or alarm).

The processing performed by the calculation execution unit 75, the second warning output unit 77, the second integration processing unit 79, the second threshold value calculation unit 81, the second lifespan estimation unit 83, etc. described above is limited to examples of sharing these processes. For example, it may be processed by a smaller number of processing units (for example, one processing unit), or may be processed by further subdivided processing units. The above processing and the like of the control unit 17 may be implemented by a program executed by the CPU 901 (see FIG. 17), which will be described later, or part or all of it may be implemented by an actual device such as an ASIC, FPGA, or other electric circuit. may be

FIG. 16 shows an example of a processing procedure executed by the control section 17 of the motor control device 5 according to this modification. In FIG. 16, the description of the same procedure as in FIG. 12 will be omitted as appropriate.

In step S<b>110 , the control unit 17 inputs the detected value of the current flowing through the winding 41 (current I) from the current detection unit 47 through the information input unit 59 . Input of the current I is continuously performed at predetermined time intervals, for example.

In step S<b>120 , the control unit 17 uses the calculation execution unit 75 to determine whether or not the current I is equal to or greater than the current threshold Ish. If the above condition is not satisfied, that is, if the current I is less than the current threshold Ish (step S120: NO), the process returns to step S110. On the other hand, when the above conditions are satisfied, the process proceeds to the next step S130.

In step S130, the control unit 17 causes the calculation execution unit 75 to determine whether or not the condition of step S120 is no longer satisfied. Specifically, it is determined whether or not the current I is less than the current threshold Ish. This step S130 is repeated while the condition of step S120 is satisfied (step S130: NO), and when the condition of step S120 is no longer satisfied (step S130: YES), the process proceeds to the next step S140.

In step S140, the control unit 17 uses the second integration processing unit 79 to calculate the current value or the time integral value while the detection value of the current detection unit 47 is equal to or greater than the current threshold value Ish.

In step S150, the control unit 17 causes the second integration processing unit 79 to integrate the current value or the time integral value calculated in step S140. The accumulated integrated value is recorded in appropriate recording means (recording device 917, etc., see FIG. 17, which will be described later).

In step S160, the control unit 17 causes the second life estimation unit 83 to determine whether or not the integrated value integrated in step S150 is equal to or greater than the upper limit value. The upper limit value is calculated by the second threshold calculator 81 and recorded in the specification information recording unit 61 in step S160 or at an appropriate timing, and is acquired from the specification information recording unit 61 . If the integrated value is less than the upper limit value (step S160: NO), it is estimated that the winding 41 has not reached the end of its life, that is, the deterioration of the insulation of the winding 41 is within the permissible range. Returning to S110, the same procedure is repeated. On the other hand, when the integrated value is equal to or greater than the upper limit value (step S160: YES), it is estimated that the winding 41 has reached the end of its life, that is, the deterioration of the insulation of the winding 41 has exceeded the allowable range. Go to step S170.

In step S<b>170 , the control unit 17 outputs a warning regarding the life of the winding 41 using the second warning output unit 77 . This completes the flowchart.

The processing procedure described above is an example, and at least part of the above procedure may be deleted or changed, and procedures other than the above may be added. The order of at least some of the above procedures may be changed, and multiple procedures may be combined into a single procedure.

According to the modified example described above, when the current flowing through the winding 41 satisfies a predetermined condition, how much the current value rises, or how much the current value rises and how long it takes It is possible to perform calculations related to the life by taking into consideration whether or not it has continued for Therefore, the life of the windings 41 can be estimated with higher accuracy in line with the actual operating conditions of the motor 3 .

<9. Hardware Configuration Example of Motor Control Device>
Next, a hardware configuration example of the motor control device 5 will be described with reference to FIG. 17 . In FIG. 17, the configuration related to the function of supplying power to the motor 3 of the motor control device 5 is omitted as appropriate.

As shown in FIG. 17, the motor control device 5 includes, for example, a CPU 901, a ROM 903, a RAM 905, a dedicated integrated circuit 907 constructed for a specific application such as an ASIC or FPGA, an input device 913, and an output device. 915 , a recording device 917 , a drive 919 , a connection port 921 and a communication device 923 . These components are connected via a bus 909 and an input/output interface 911 so as to be able to transmit signals to each other.

The program can be recorded in, for example, the ROM 903, the RAM 905, the recording device 917 including a hard disk, or the like.

The program is temporarily or non-temporarily (permanently) recorded on a removable recording medium 925 such as a magnetic disk such as a flexible disk, an optical disk such as various CDs, MO disks, and DVDs, or a semiconductor memory. You can also keep Such a recording medium 925 can also be provided as so-called package software. In this case, the programs recorded on these recording media 925 may be read by the drive 919 and recorded on the recording device 917 via the input/output interface 911, bus 909, or the like.

Also, the program can be recorded in, for example, a download site, another computer, another recording device, or the like (not shown). In this case, the program is transferred via a network NW such as LAN or Internet, and the communication device 923 receives this program. The program received by the communication device 923 may be recorded in the recording device 917 via the input/output interface 911, the bus 909, or the like.

Also, the program can be recorded in an appropriate externally connected device 927, for example. In this case, the program may be transferred via an appropriate connection port 921 and recorded in the recording device 917 via the input/output interface 911, bus 909, or the like.

Then, the CPU 901 executes various processes in accordance with the programs recorded in the recording device 917, thereby causing the information input section 59, the specification information recording section 61, the calculation execution section 63, the first warning output section 65, A coefficient setting unit 67, a first integration processing unit 69, a first threshold calculation unit 71, a first life estimation unit 73, a second warning output unit 77, a second integration processing unit 79, a second threshold calculation unit 81, and a second Processing by the life estimation unit 83 and the like is realized. At this time, the CPU 901 may, for example, directly read out the program from the recording device 917 and execute it, or load the program once into the RAM 905 and execute it. Furthermore, when the CPU 901 receives a program via the communication device 923 , the drive 919 , or the connection port 921 , for example, the received program may be directly executed without being recorded in the recording device 917 .

In addition, the CPU 901 may perform various processing based on signals and information input from an input device 913 such as a mouse, keyboard, microphone, touch panel (not shown), etc., as necessary.

Then, the CPU 901 may output the result of executing the above processing from an output device 915 such as a display device or an audio output device. It may be transmitted via the port 921 or may be recorded in the recording device 917 or the recording medium 925 .

In addition to the methods already described above, the methods according to the above embodiments and modifications may be used in combination as appropriate. In addition, although not exemplified one by one, the above-described embodiment and each modified example can be implemented with various modifications within the scope not departing from the spirit thereof.

The problems and effects to be solved by the embodiments, modifications, and the like described above are not limited to the contents described above. Depending on the embodiments, modifications, etc., problems not described above can be solved, effects not described above can be achieved, only part of the problems described can be solved, and one of the effects described can be obtained. Sometimes only the part is played.

Reference Signs List 1 electric vehicle 3 motor 5 motor control device 15 motor control system 35 temperature detection unit 39b slot 40 electric wire 41 winding 43 resin 47 current detection unit 61 specification information recording unit (information recording unit)
63 calculation execution unit 65 first warning output unit 67 coefficient setting unit 69 first integration processing unit 71 first threshold value calculation unit 73 first life estimation unit 75 calculation execution unit 77 second warning output unit 79 second integration processing unit 81 second 2nd threshold calculator 83 second life estimator Ish current threshold (first threshold)
intI1 time integral value intI2 time integral value intI3 time integral value limI upper limit (fourth threshold)
Nmax upper limit number of times (third threshold)
Tsh temperature threshold (second threshold)

Claims (21)

a motor with windings;
a motor control device that controls the motor,
The motor control device
an information recording unit for recording specification information about the winding;
an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information recorded in the information recording unit;
has
The specification information is
A space factor, which is the ratio of the cross-sectional area of the electric wire to the cross-sectional area of the slot in which the winding is accommodated, and the cross-sectional area of the portion other than the bubble with respect to the cross-sectional area of the resin covering the winding Including at least one of the filling rate, which is the proportion of
motor control system. a motor with windings;
a motor control device that controls the motor,
The motor control device
A calculation execution unit that executes calculations related to the life of the winding based on the specification information about the winding when the current flowing through the winding and the temperature of the winding satisfy predetermined conditions;
has
The specification information is
A space factor, which is the ratio of the cross-sectional area of the electric wire to the cross-sectional area of the slot in which the winding is accommodated, and the cross-sectional area of the portion other than the bubble with respect to the cross-sectional area of the resin covering the winding Including at least one of the filling rate, which is the proportion of
motor control system. a motor with windings;
a motor control device that controls the motor,
The motor control device
an information input unit that inputs the current flowing through the winding from a current detection unit and inputs the temperature of the winding from a temperature detection unit;
When the current flowing through the winding satisfies a first condition and the temperature of the winding satisfies a second condition, based on the specification information about the winding, the life of the winding an arithmetic execution unit that executes an arithmetic operation;
A motor control system, comprising: a motor with windings;
a motor control device that controls the motor,
The motor control device
an information recording unit for recording specification information about the winding;
an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information recorded in the information recording unit;
an information input unit that inputs detected values from a current detection unit that detects the current flowing through the winding and a temperature detection unit that detects the temperature of the winding,
The arithmetic execution unit
a first integration processing unit that integrates the number of times the value detected by the current detection unit is greater than or equal to a first threshold and the value detected by the temperature detection unit is less than or equal to a second threshold;
a first life estimating unit that estimates the life of the winding based on the accumulated number of times and a third threshold;
A motor control system, comprising: a motor with windings;
a motor control device that controls the motor,
The motor control device
an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information about the winding when the current flowing through the winding and the temperature of the winding satisfy predetermined conditions;
an information input unit that inputs detected values from a current detection unit that detects the current flowing through the winding and a temperature detection unit that detects the temperature of the winding,
The arithmetic execution unit
a first integration processing unit that integrates the number of times the value detected by the current detection unit is greater than or equal to a first threshold and the value detected by the temperature detection unit is less than or equal to a second threshold;
a first life estimating unit that estimates the life of the winding based on the accumulated number of times and a third threshold;
A motor control system, comprising: The arithmetic execution unit
a first threshold calculation unit that calculates the third threshold based on the specification information about the winding;
6. A motor control system according to claim 4 or 5 , comprising: The arithmetic execution unit
A coefficient is calculated based on the detection value of the current detection unit while the detection value of the current detection unit is equal to or greater than the first threshold and the detection value of the temperature detection unit is equal to or less than the second threshold. coefficient setting part to be set,
has
The first integration processing unit
counting the number of times based on the factor;
A motor control system according to any one of claims 4 to 6 . The motor control device
a first warning output unit that outputs a warning related to the life of the winding when the accumulated number of times exceeds the third threshold;
8. A motor control system as claimed in any one of claims 4 to 7 , comprising: a motor with windings;
a motor control device that controls the motor,
The motor control device
an information recording unit for recording specification information about the winding;
an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information recorded in the information recording unit;
an information input unit for inputting a detected value from a current detection unit that detects the current flowing through the winding;
The arithmetic execution unit
a second integration processing unit that integrates the detection value of the current detection unit or a time integral value obtained by integrating the detection value of the current detection unit over time while the detection value of the current detection unit is equal to or greater than a first threshold; ,
a second life estimating unit that estimates the life of the winding based on the integrated detection value or the time integral value and a fourth threshold;
A motor control system, comprising: a motor with windings;
a motor control device that controls the motor,
The motor control device
an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information about the winding when the current flowing through the winding satisfies a predetermined condition;
an information input unit for inputting a detected value from a current detection unit that detects the current flowing through the winding;
The arithmetic execution unit
a second integration processing unit that integrates the detection value of the current detection unit or a time integral value obtained by integrating the detection value of the current detection unit over time while the detection value of the current detection unit is equal to or greater than a first threshold; ,
a second life estimating unit that estimates the life of the winding based on the integrated detection value or the time integral value and a fourth threshold;
A motor control system, comprising: The arithmetic execution unit
a second threshold calculation unit that calculates the fourth threshold based on the acceleration test;
has
The information recording unit
recording the specification information including the fourth threshold;
A motor control system according to claim 9 . The motor control device
a second warning output unit that outputs a warning related to the life of the winding when the integrated detection value or the time-integrated value exceeds the fourth threshold;
12. A motor control system as claimed in any one of claims 9 to 11 , comprising: A motor control device for controlling a motor with windings,
an information recording unit for recording specification information about the winding;
an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information recorded in the information recording unit;
has
The specification information is
A space factor, which is the ratio of the cross-sectional area of the electric wire to the cross-sectional area of the slot in which the winding is accommodated, and the cross-sectional area of the portion other than the bubble with respect to the cross-sectional area of the resin covering the winding Including at least one of the filling rate, which is the proportion of
motor controller. A motor control device for controlling a motor with windings,
an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information about the winding when the current flowing through the winding and the temperature of the winding satisfy predetermined conditions; ,
The specification information is
A space factor, which is the ratio of the cross-sectional area of the electric wire to the cross-sectional area of the slot in which the winding is accommodated, and the cross-sectional area of the portion other than the bubble with respect to the cross-sectional area of the resin covering the winding Including at least one of the filling rate, which is the proportion of
motor controller. A motor control device for controlling a motor with windings,
an information input unit that inputs the current flowing through the winding from a current detection unit and inputs the temperature of the winding from a temperature detection unit;
When the current flowing through the winding satisfies a first condition and the temperature of the winding satisfies a second condition, based on the specification information about the winding, the life of the winding an arithmetic execution unit that executes an arithmetic operation ,
motor controller. A life estimation method for estimating the life of a winding provided in a motor, comprising:
Acquiring specification information about the windings recorded in a motor control device that controls the motor;
performing a calculation related to the life of the winding based on the specification information;
has
The specification information is
A space factor, which is the ratio of the cross-sectional area of the electric wire to the cross-sectional area of the slot in which the winding is accommodated, and the cross-sectional area of the portion other than the bubble with respect to the cross-sectional area of the resin covering the winding Including at least one of the filling rate, which is the proportion of
Lifespan estimation method. A life estimation method for estimating the life of a winding provided in a motor, comprising:
performing a calculation related to the life of the winding based on the specification information about the winding when the current flowing through the winding and the temperature of the winding satisfy predetermined conditions;
has
The specification information is
A space factor, which is the ratio of the cross-sectional area of the electric wire to the cross-sectional area of the slot in which the winding is accommodated, and the cross-sectional area of the portion other than the bubble with respect to the cross-sectional area of the resin covering the winding Including at least one of the filling rate, which is the proportion of
Lifespan estimation method. A life estimation method for estimating the life of a winding provided in a motor, comprising:
inputting the current flowing through the winding and inputting the temperature of the winding;
When the current flowing through the winding satisfies a first condition and the temperature of the winding satisfies a second condition, based on the specification information about the winding, the life of the winding performing an operation ;
A method for estimating a lifetime, comprising: a motor with windings;
a motor control device that controls the motor;
wheels driven by the motor;
a vehicle body on which the motor and the motor control device are mounted and which travels on the wheels;
The motor control device
an information recording unit for recording specification information about the winding;
an arithmetic execution unit that executes an arithmetic operation related to the life of the winding based on the specification information recorded in the information recording unit;
has
The specification information is
A space factor, which is the ratio of the cross-sectional area of the electric wire to the cross-sectional area of the slot in which the winding is accommodated, and the cross-sectional area of the portion other than the bubble with respect to the cross-sectional area of the resin covering the winding Including at least one of the filling rate, which is the proportion of
electric vehicle. a motor with windings;
a motor control device that controls the motor;
wheels driven by the motor;
a vehicle body on which the motor and the motor control device are mounted and which travels on the wheels;
The motor control device
A calculation execution unit that executes calculations related to the life of the winding based on the specification information about the winding when the current flowing through the winding and the temperature of the winding satisfy predetermined conditions;
has
The specification information is
A space factor, which is the ratio of the cross-sectional area of the electric wire to the cross-sectional area of the slot in which the winding is accommodated, and the cross-sectional area of the portion other than the bubble with respect to the cross-sectional area of the resin covering the winding Including at least one of the filling rate, which is the proportion of
electric vehicle. a motor with windings;
a motor control device that controls the motor;
wheels driven by the motor;
a vehicle body on which the motor and the motor control device are mounted and which travels on the wheels;
The motor control device
an information input unit that inputs the current flowing through the winding from a current detection unit and inputs the temperature of the winding from a temperature detection unit;
When the current flowing through the winding satisfies a first condition and the temperature of the winding satisfies a second condition, based on the specification information about the winding, the life of the winding an arithmetic execution unit that executes an arithmetic operation;
An electric vehicle.

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