WO2016117144A1 - 電動パワーステアリング用モータ駆動制御装置 - Google Patents
電動パワーステアリング用モータ駆動制御装置 Download PDFInfo
- Publication number
- WO2016117144A1 WO2016117144A1 PCT/JP2015/067045 JP2015067045W WO2016117144A1 WO 2016117144 A1 WO2016117144 A1 WO 2016117144A1 JP 2015067045 W JP2015067045 W JP 2015067045W WO 2016117144 A1 WO2016117144 A1 WO 2016117144A1
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- WO
- WIPO (PCT)
- Prior art keywords
- motor drive
- control device
- electric power
- power steering
- drive control
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
- B62D5/0406—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box including housing for electronic control unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
- H01L23/3675—Cooling facilitated by shape of device characterised by the shape of the housing
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/223—Heat bridges
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- 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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/10—Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/0026—Casings, cabinets or drawers for electric apparatus provided with connectors and printed circuit boards [PCB], e.g. automotive electronic control units
- H05K5/0043—Casings, cabinets or drawers for electric apparatus provided with connectors and printed circuit boards [PCB], e.g. automotive electronic control units comprising a frame housing mating with two lids wherein the PCB is flat mounted on the frame housing
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/02—Arrangements of circuit components or wiring on supporting structure
- H05K7/023—Stackable modules
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
Definitions
- the present invention relates to a motor drive control device for electric power steering that drives and controls a motor used in an electric power steering device for a vehicle, for example.
- An electric power steering device for an automobile detects a turning direction and turning torque of a steering shaft that is turned by a driver operating a steering wheel, and based on the detected value, The electric motor is driven to rotate in the same direction, and a steering assist torque is generated.
- a motor drive control device for electric power steering that controls the drive of a motor used in an electric power steering device has a small and highly reliable structure, and has the same MOSFET and smoothing capacitor as a semiconductor switch that constitutes drive control.
- a control board on which the surface mounting components for the control circuit constituting the control circuit are mounted a power board on which the surface mounting components for power are mounted, and between the control board and the power board, the power supply system or other external devices such as an ECU
- a laminated structure is adopted in which a connector case integrated with an external connection connector for connecting to is sandwiched between an upper cover and a lower heat sink.
- JP2013-63689A (FIG. 2) JP2013-103535A (FIG. 2)
- the MOSFET and the smoothing capacitor are arranged on the same metal substrate, and are configured by a lid and a housing.
- the smoothing capacitor is affected by the heat generated from the MOSFET surface, and the housing is also attached to the metal substrate, so that the temperature rise of the smoothing capacitor increases. There was a problem.
- the present invention has been made to solve the above-described problems, and suppresses the temperature rise of the smoothing capacitor whose lifetime is temperature-dependent, thereby improving the reliability and height of the control device.
- An object of the present invention is to provide a motor drive control device for electric power steering that is reduced in size and reduced in size.
- An electric power steering motor drive control device is an electric power steering motor drive control device for driving and controlling a motor used in the electric power steering device, and a plurality of switching elements for supplying current to the motor, A smoothing capacitor for absorbing a ripple component of the motor current that flows when the switching element is turned on / off, a control circuit on which a drive circuit for driving and controlling the switching element and a capacitor for the control circuit are mounted, and a control signal from the control board is transmitted to the switching element A control signal line to be supplied to the switching element, an electrical connection member for electrically connecting the switching element and the smoothing capacitor, and a heat sink portion in which the switching element is embedded and disposed, and the electrical connection member between the switching element and the control board As well as electrical It is obtained by placing the control circuit capacitor and the smoothing capacitor in a space formed between the connection member and the control board.
- the smoothing capacitor is less affected by the heat from the switching element, the housing, and the heat sink, so that the temperature rise of the smoothing capacitor is suppressed and the reliability is improved. Further, since the height direction of the control device is reduced, the device can be miniaturized.
- FIG. 1 is a circuit configuration diagram of an electric power steering device including a motor drive control device according to Embodiment 1 of the present invention.
- FIG. 1 is a structural diagram of a motor drive control device according to Embodiment 1 of the present invention. It is sectional drawing of the electrical connection member used for the motor drive control apparatus which concerns on Embodiment 1 of this invention. It is another sectional drawing of the electrical connection member used for the motor drive control apparatus which concerns on Embodiment 1 of this invention. It is the figure which looked at the electrical connection member used for the motor drive control apparatus which concerns on Embodiment 1 of this invention from the upper surface. It is a figure which shows the positional relationship of each element used for the motor drive control apparatus which concerns on Embodiment 1 of this invention.
- FIG. 1 is a structural diagram of an electric power steering device including a motor drive control device according to Embodiment 1 of the present invention. It is a figure which shows the positional relationship of each element used for the motor drive control apparatus which concerns on Embodiment 2 of this invention.
- FIG. 1 is a circuit configuration diagram of an electric power steering device including a motor drive control device for electric power steering (hereinafter simply referred to as a motor drive control device) according to Embodiment 1
- FIG. 2 is a structural diagram of the motor drive control device. It is.
- an electric power steering device 100 includes an electric motor 30 that outputs an auxiliary torque to the steering wheel 1 of the vehicle, a motor drive control device 3 that controls the drive of the electric motor 30, and the rotational speed of the electric motor 30.
- a deceleration device 2 that decelerates the vehicle, a battery 4 that supplies a current for driving the electric motor 30, and a torque sensor 6 that is disposed in the vicinity of the steering wheel of the vehicle and detects the steering torque of the steering wheel 1 that the driver steers.
- the electric motor 30 driven by the motor drive control device 3 is a three-phase brushless motor, and the armature windings 31u, 31v, 31w are Y-connected.
- the motor drive control device 3 includes a power connector 7 that electrically connects the battery 4 and the motor drive control device 3, and a vehicle side signal connector 8 that receives a vehicle side signal 5 such as a vehicle traveling speed signal from the vehicle side. And a torque sensor connector 9 for electrically connecting the torque sensor 6 and the motor drive control device 3.
- the motor drive control device 3 also switches the motor current according to the smoothing capacitors 25a to 25c for absorbing the ripple component of the motor current flowing through the electric motor 30 and the magnitude and direction of the auxiliary torque output to the handle 1.
- the power supply relay 40 which is a switching means for supplying and cutting off the battery current supplied to the switching elements 20a to 20c constituting the circuit, and the switching elements 20a to 20c and the power supply relay 40 constituting the three-phase bridge circuit are turned on / off.
- the switching element 20a is mounted with a field effect transistor (hereinafter referred to as FET) 21a and FET 22a, the switching element 20b is mounted with FET 21b and FET 22b, and the switching element 20c is mounted with FET 21c and FET 22c connected to each other at one end. ing.
- the FET 21a of the switching element 20a constitutes the U-phase plus side arm of the three-phase bridge circuit
- the FET 22a constitutes the U-phase minus side arm
- the FET 21b constitutes the V-phase plus side arm of the three-phase bridge circuit
- the FET 22b is minus the V-phase.
- the side arm is configured, the FET 21c is the W-phase plus side arm of the three-phase bridge circuit, and the FET 22c is the W-phase minus side arm.
- the other ends of the FETs 21a to 21c are connected to smoothing capacitors 25a to 25c for absorbing a ripple component of the motor current flowing through the electric motor 30 by turning on and off the switching elements 20a to 20c, respectively.
- the other ends of the FETs 22a to 22c are connected to an installation potential portion of the vehicle via shunt resistors 24a to 24c, respectively.
- connection point A where one ends of the FET 21a and the FET 22a are connected, a connection point B where one ends of the FET 21b and the FET 22b are connected, and a connection point C where the FET 21c and the FET 22c are connected are respectively the U phase of the three-phase bridge circuit, V-phase and W-phase AC side terminals.
- the connection points A, B, and C of the switching elements 20a to 20c are connected to one ends of the FETs 23a to 23c, respectively, and the other ends of the FETs 23a to 23c are armature windings 31u, 31v of the electric motor 30, respectively. And 31w U-phase, V-phase, and W-phase terminals.
- the FETs 23a to 23c thus connected are controlled by the control board 10 so as to be normally turned on, and when necessary, the FETs 23a to 23c serve to electrically disconnect the electric motor 30, that is, to serve as a motor relay.
- the same three switching elements are used as the switching elements 20a to 20c.
- all the switching elements 20a to 20c are integrated into one module, and an inverter is formed using the one module.
- a circuit may be configured.
- one smoothing capacitor 25a to 25c is attached to each switching element 20a to 20c, but the number is not particularly limited as long as it is a necessary number for absorbing the ripple component of the motor current.
- One end of the two FETs 41 and 42 mounted on the power relay 40 are connected to each other, the other end of one FET 41 is connected to the power connector 7 via the coil 43, and the other FET 42 The end is connected to the positive side DC terminal of the three-phase bridge circuit composed of the switching elements 20a to 20c.
- 1 shows an example in which the position of the power relay 40 is arranged between the positive side of the switching elements 20a to 20c constituting the three-phase bridge circuit and the coil 43, but between the power connector 7 and the coil 43.
- An arranged configuration may be used.
- the single coil 43 is configured, but a configuration in which a plurality of coils are connected in series may be used in order to disperse heat generation.
- the control board 10 includes a microcomputer 11, an FET drive circuit 12, a current detection circuit 13, and a control circuit capacitor 14.
- the control circuit capacitor 14 is a capacitor for supplying the power source Vc to the semiconductor control elements and circuit elements constituting the microcomputer 11, the FET drive circuit 12, the current detection circuit 13 and the like mounted on the control board 10. Electrolytic capacitors are used to stably operate each control element and circuit element.
- the torque sensor 6 detects the steering torque, and a steering torque signal corresponding to the detected torque is input to the microcomputer 11.
- the rotation sensor 51 is constituted by a resolver or a magnetic sensor, and a rotation detection signal corresponding to the steering rotation number detected by the rotation sensor 51 is input to the microcomputer 11. Further, the motor current flowing through the electric motor 30 is detected by the current detection circuit 13 through one end of the shunt resistors 24 a to 24 c, and the motor current signal from the current detection circuit 13 is input to the microcomputer 11.
- the microcomputer 11 calculates the FET from the steering torque signal from the torque sensor 6, the rotation detection signal detected by the rotation sensor 51, the vehicle side signal 5 such as the vehicle traveling speed signal, and the motor current signal from the current detection circuit 13. A control signal input to the drive circuit 12 is calculated.
- the FET drive circuit 12 generates a gate drive signal at a predetermined timing based on a control signal from the microcomputer 11 and controls the switching elements 20a to 20c of the three-phase bridge circuit and each FET of the power supply relay 40.
- the three-phase bridge circuit generates a predetermined three-phase alternating current and supplies the three-phase alternating current to the armature windings 31u to 31v of the electric motor 30 to drive the electric motor 30.
- the torque generated by the electric motor 30 is applied as an assist torque to the steering shaft via the reduction gear 2. Thereby, the steering force of the steering wheel 1 by the driver is reduced.
- FIG. 1 shows an example in which the armature windings 31u to 31v of the electric motor 30 are Y-connected, they may be ⁇ -connected.
- the side where the motor drive control device 3 is connected to the motor 30 is the front side of the motor drive control device 3, and the side not connected to the motor is the rear side of the motor drive control device.
- the motor drive control device 3 according to the first embodiment is hierarchically arranged in the order of the cover 60, the control board 10, the electrical connection member 15, and the heat sink part 70.
- Mounted on the control board 10 are a microcomputer 11, an FET drive circuit 12 having a control element, a current detection circuit 13, and a control circuit capacitor 14 necessary for power supply to the control elements of the microcomputer 11 and the FET drive circuit 12.
- the control signal from the control board 10 is sent to the switching elements 20a to 20c as electric signals via the control signal lines 26a to 26c connected to the switching elements 20a to 20c.
- the switching elements 20a to 20c are made of resin-molded bare FET chips, and are equipped with shunt resistors 24a to 24c for the purpose of current detection.
- the semiconductor elements used for the switching elements 20a to 20c are voltage-controlled self-extinguishing high-speed semiconductor elements, and MOSFETs or IGBTs are selected. If a wide gap semiconductor such as silicon carbide (SiC) or gallium nitride (GaN) is used, it is possible to configure a small motor drive control device 3 with lower loss due to its high-speed switching characteristics and high-temperature operation characteristics. .
- the switching elements 20a to 20c drive the electric motor 30 by supplying a necessary current to the electric motor 30. Further, the switching elements 20a to 20c are arranged in the heat sink part 70.
- the heat sink portion 70 is made of a metal such as aluminum, for example, and has a function of absorbing heat generated in the switching elements 20a to 20c and reducing a temperature rise of the switching elements 20a to 20c.
- the heat sink portion 70 has a structure of a recess 70a that is cut deeper than the length in the thickness direction of the switching elements 20a to 20c so that the switching elements 20a to 20c are embedded.
- the switching elements 20a to 20c are completely formed in the concave part 70a of the heat sink part 70.
- the switching elements 20a to 20c have an insulating layer on a base material such as aluminum, and a copper foil for forming a circuit on the insulating layer, or a high thermal conductive ceramic material and a wiring conductor. It may be mounted on a ceramic substrate constituted by the above and contact with the heat sink part 70 through these substrates. Further, the switching elements 20a to 20c may be in contact with the heat sink part 70 via an adhesive or solder. With such a configuration, the heat generated in the switching elements 20a to 20c can be efficiently transmitted to the heat sink portion 70, so that the temperature rise of the switching elements 20a to 20c can be suppressed.
- a highly thermally conductive insulating material such as mold resin or silicone gel is placed in the concave portion 70a.
- An injected configuration may be used. With such a configuration, the heat generated in the switching elements 20a to 20c can be efficiently transmitted to the heat sink portion 70, so that the temperature rise of the switching elements 20a to 20c can be suppressed and the switching elements 20a to 20c can be suppressed. Since the electrically exposed portion of 20c can be insulated, the reliability can be further improved.
- the FET 41 and the FET 42 constituting the power supply relay 40 are not shown, but are arranged so as to be embedded in the recesses 70a provided in the heat sink part 70 as in the switching elements 20a to 20c.
- An electrical connection member 15 made of a metal bus bar and an insulating resin is in contact with the end surface (rear side) of the heat sink portion 70 provided with the recess 70a so as to completely cover the switching elements 20a to 20c. Has been placed. By doing this, smoothing capacitors 25a to 25c (25c are not visible in FIG. 2; the same applies hereinafter) disposed on the rear side of the electrical connection member 15, and a control board attached to the rear side of the electrical connection member 15 Since the influence of heat from the switching elements 20a to 20c and the heat sink part 70 can be suppressed on the microcomputer 11 and the control elements constituting the FET drive circuit 12 arranged in 10, the reliability is further improved. be able to.
- a rotation sensor 51 is provided on the other end surface (front side) of the heat sink unit 70. The rotation sensor 51 may be a resolver, but may be configured by a combination of a permanent magnet and a GMR sensor.
- the electrical connection member 15 is disposed between the switching elements 20a to 20c and the control board 10, and smoothing capacitors 25a to 25c are formed in a space formed between the electrical connection member 15 and the control board 10.
- the control circuit capacitor 14 mounted on the control board 10 is also disposed in this space.
- a cover 60 is screwed with a screw 101 into a heat sink connecting screw hole 92 (see FIG. 5) provided in the heat sink part 70 so as to cover the control board 10 and the electrical connection member 15.
- the connection between the heat sink unit 70 and the cover 60 is not limited to screwing, but may be an adhesive or a combination of screws and adhesive.
- the cover 60 is made of metal or resin, and the cover 60 is integrally formed with an arrangement space for the power connector 7, the vehicle-side signal connector 8, the torque sensor connector 9, and the coil 43.
- FIG. 3 is a cross-sectional view of the electrical connection member 15. Power supply to the switching elements 20a to 20c and electrical connection between the switching elements 20a to 20c and the smoothing capacitors 25a to 25c are performed through the electrical connection member 15.
- the electrical connection member 15 is planar, and the size of the plane is the same as or approximately the same as the planar size of the control board 10.
- the electrical connection member 15 is configured such that a current-carrying bus bar made of a metal positive side bus bar 15a and a negative side bus bar 15b is disposed on an insulating member 15c such as a resin, or a part of the positive side bus bar 15a and the negative side bus bar 15b. Alternatively, all of them are formed by molding with an insulating member 15c such as resin.
- the plus-side bus bar 15a and the minus-side bus bar 15b serve to supply current
- the insulating member 15c such as resin is used to ensure electrical insulation between the current-carrying bus bars 15a and 15b and other parts such as the heat sink portion 70 and to be energized. It plays the role of a frame that supports the bus bar, and further, the heat shielding function that makes it difficult for the heat from the switching elements 20a to 20c and the heat from the heat sink part 70 to be transmitted to the smoothing capacitors 25a to 25c.
- the insulating member 15c such as resin has a rising flange 15cd around the planar end so that a space is formed between the insulating member 15c and the control board 10.
- one surface of the electrical connection member 15 comes into contact with the end face of the heat sink portion 70 as shown in FIG. 2, and completely covers the switching elements 20a to 20c.
- the effects of heat from the switching elements 20a to 20c and the heat sink unit 70 on the smoothing capacitors 25a to 25c disposed on the upper surface of the electrical connection member 15, the microcomputer 11 and the FET drive circuit 12 disposed on the control board 10 Can be suppressed.
- FIG. 4 is a diagram showing another structure of the electrical connection member 15. As shown in FIG. 4, even if the rising flange 15cd formed around the end of the insulating member 15c of the electrical connecting member 15 protrudes toward the heat sink portion 70 opposite to the control board 10 side, the switching element If the structure covers the region including 20a to 20c, the same effect as described above can be obtained.
- FIG. 5 is a view of the heat sink portion 70, the switching elements 20a to 20c, and the electrical connection member 15 as viewed from the rear side.
- the plus side bus bar 15 a and the minus side bus bar 15 b of the electrical connection member 15 are connected to the battery 4 via the power connector 7.
- the plus-side bus bar 15a and the minus-side bus bar 15b are wired so as to be close to each other in parallel, and are arranged so as to draw a loop, and each of the plus-side bus bar 15a and the switching elements 20a to 20c has a P
- the terminals 28a to 28c are connected to the negative side bus bar 15b and the N terminals 29a to 29c of the switching elements 20a to 20c.
- smoothing capacitors 25a to 25c for reducing ripple current caused by the switching elements 20a to 20c are mounted on the electrical connection member 15.
- the smoothing capacitors 25a to 25c are, for example, a large-capacity aluminum electrolytic capacitor or a conductive polymer hybrid aluminum electrolytic capacitor having a small DC equivalent resistance (ESR) to absorb the ripple component of the motor current flowing in the motor 30.
- ESR DC equivalent resistance
- the conductive polymer hybrid aluminum electrolytic capacitor is composed of a hybrid electrolyte having the characteristics of both a solid conductive polymer and a liquid electrolyte used in the aluminum electrolytic capacitor.
- the motor drive control device 3 has low ESR and high ripple current characteristics equivalent to those of conductive polymer capacitors, and low leakage current characteristics that are characteristic of aluminum electrolytic capacitors. Therefore, when the ripple current characteristics are the same, the physique of the conductive polymer hybrid aluminum electrolytic capacitor is smaller than that of the aluminum electrolytic capacitor, so that the height of the motor drive control device 3 can be made lower by using this. Can do. Further, when the length of the end face of the smoothing capacitors 25a to 25c is smaller than the length of the side face, the end face of the smoothing capacitor may be placed horizontally so that it is perpendicular to the upper plane of the electrical connecting member 15. desirable. With such an arrangement, the height of the motor drive control device 3 can be further reduced.
- FIG. 6 is a view of the positional relationship among the power relay 40, the switching elements 20a to 20b, and the smoothing capacitors 25a to 25c attached to the heat sink portion 70, as viewed from the rear side.
- the power relay 40, the switching elements 20a to 20b, and the smoothing capacitors 25a to 25c are arranged at positions that do not overlap vertically when viewed from the rear side.
- FIG. 6 shows a configuration in which the smoothing capacitors 25a to 25c are arranged in the circumferential direction as an example.
- the arrangement direction may be either the inner side or the outer side of the end surface. Not limited to this, it may be placed vertically as shown in FIG. In any arrangement, the smoothing capacitors 25a to 25c are not easily affected by the heat generated from the switching elements 20a to 20b, so that the reliability can be further improved.
- the control board 10 is composed of a multilayer (for example, four layers) glass / epoxy board, and the smoothing capacitors 25a to 25b are electrically connected so that the smoothing capacitors 25a to 25b are sandwiched between the control board 10 and the electrical connection member 15. It is attached to the rear side upper surface of the connecting member 15.
- a microcomputer 11 a control element constituting the FET drive circuit 12, a current detection circuit 13, and a control circuit capacitor 14 necessary for supplying power to the control element are mounted on the control board 10.
- the microcomputer 11, the FET drive circuit 12, and the current detection circuit 13 are arranged on the rear side surface of the control board 10, and the control circuit capacitor 14 is arranged on the front side surface of the control board 10, and the smoothing capacitors 25a to 25c are arranged. It is set as the structure arrange
- the smoothing capacitors 25 a to 25 c and the control circuit capacitor 14 are sandwiched between the control board 10 and the electrical connection member 15 as described above, the space formed between the control board 10 and the electrical connection member 15 is effectively used. Therefore, the motor drive control device 3 can be reduced in size. Further, since the smoothing capacitors 25a to 25c and the control circuit capacitor 14 are not easily affected by the heat received from the switching elements 20a to 20b, the microcomputer 11, and the FET drive circuit 12, the reliability can be further improved. it can. *
- FIG. 8 shows an example of the structure of an electric power steering device 100 in which the motor drive control device 3 and the electric motor 30 are integrated.
- an armature winding 31 (31u, 31v, 31w) is wound around a stator core 32 (32u, 32v, 32w), and a rotor core 34 and a permanent magnet are opposed to the stator core 32.
- a rotor with 33 is arranged.
- a shaft 80 is press-fitted into the center of the rotation axis of the rotor core 34, and a boss 81 that is a coupling with a gear shaft is press-fitted into one end of the shaft 80.
- the shaft 80 is supported by two bearings 71 and 72, and the bearings 71 and 72 are fixed to the cover 62 so that the rotor can rotate.
- the part is provided with a rotation sensor 51.
- the cover 62 and the stator core 32 are fixed to the frame 63 by shrink fitting or the like.
- the frame 63 is made of, for example, aluminum, and is screwed to the frame connecting screw hole portion 91 (see FIG. 5) provided in the heat sink portion 70 with screws 102.
- the armature winding 31 (31u, 31v, 31w) is electrically connected to a bus bar (not shown) via the terminal 61, and the bus bar (not shown) and the motor drive control device 3 are electrically connected. Is done.
- the bus bar (not shown) can be supplied with current from the FET output units 27a to 27c (see FIG. 5) of the switching elements 20a to 20c of the motor drive control device 3, and can drive the electric motor 30.
- the motor drive control device 3 is connected to the electric motor 30 via the heat sink part 70, and the motor drive control device 3 can block the heat generated from the electric motor 30 by the heat sink part 70. Furthermore, the smoothing capacitors 25a to 25c of the motor drive control device 3 can block the heat from the heat sink portion 70 and the switching elements 20a to 20c by the electrical connection member 15, so that the reliability can be further improved. it can.
- the switching elements 20a to 20c, the control circuit capacitor 14, the smoothing capacitors 25a to 25c, the switching element and the smoothing capacitor are provided.
- the control circuit capacitor 14 and the smoothing capacitor 2 is provided in the motor drive control device for electric power steering.
- the smoothing capacitors 25a to 25c are less affected by the heat from the switching elements 20a to 20c, the housing, and the heat sink part 70.
- the temperature rise of the capacitors 25a to 25c is suppressed, the reliability is improved, and the height direction of the motor drive control device 3 is reduced, so that the device can be downsized.
- FIG. 9 is a diagram showing the positional relationship of each element used in the motor drive control device 3 corresponding to FIG.
- the power relay 40 and the switching elements 20a to 20b are evenly arranged in FIG. 6, and the smoothing capacitors 25a to 25c are evenly arranged between these elements. As shown in FIG. 9, the switching elements 20a to 20c are arranged in the vicinity of the heat sink connecting screw hole 92.
- Other configurations are the same as those of the first embodiment, and the same or corresponding parts are denoted by the same reference numerals.
- the heat sink connecting screw hole portion 92 is constituted by a part of the heat sink portion 70, and since the metal thickness of this portion is larger than the surroundings, the heat capacity is large. Therefore, since the cooling effect of the switching elements 20a to 20c is increased, the temperature rise can be suppressed, and the heat generated from the switching elements 20a to 20b by the smoothing capacitors 25a to 25c arranged on the rear side surface of the electrical connection member 15 can be suppressed. Since it becomes difficult to be affected, the reliability can be further improved. Further, when the smoothing capacitors 25a to 25c and the switching elements 20a to 20c are arranged at positions where they do not overlap each other when viewed from the rear side surface of the electrical connection member 15, they are affected by the heat from the switching elements 20a to 20c. Since it becomes difficult, reliability can be improved more.
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Abstract
Description
従来から電動パワーステアリング装置に用いられるモータを駆動制御する電動パワーステアリング用モータ駆動制御装置については、小型で信頼性の高い構造として、駆動制御を構成する半導体スイッチとしてのMOSFETと平滑コンデンサを同一の金属基板上に配置した電力変換回路部と、マイコンなどの制御回路部品を配置した制御回路部、およびフィルタを配置したフィルタ部を、蓋体とハウジングにより構成される収容空間に収容された積層構造が採られている。(例えば特許文献1の図2参照)
以下、この発明の実施の形態1に係る電動パワーステアリング用モータ駆動制御装置を図1~図8に基づいて説明する。
図1は、実施の形態1に係る電動パワーステアリング用モータ駆動制御装置(以下、単にモータ駆動制御装置という。)を含む電動パワーステアリング装置の回路構成図、図2はモータ駆動制御装置の構造図である。
なお、モータ駆動制御装置3により駆動される電動モータ30は、3相ブラシレスモータで構成されており、各々の電機子巻線31u、31v、31wはY結線されている。
またモータ駆動制御装置3は、電動モータ30に流れるモータ電流のリップル成分を吸収するための平滑コンデンサ25a~25cと、ハンドル1に出力する補助トルクの大きさと方向に応じてモータ電流を切り替えるための3相ブリッジ回路を構成する同一のスイッチング素子20a、20b、20cと、スイッチング素子20a~20cのスイッチング動作時に発生する電磁ノイズが外部へ流出することを防止するコイル43と、バッテリー4から3相ブリッジ回路を構成するスイッチング素子20a~20cに供給されるバッテリー電流を通電、遮断するスイッチ手段である電源リレー40と、これら3相ブリッジ回路を構成するスイッチング素子20a~20cと電源リレー40のオン、オフの状態を制御するための制御基板10と、電動モータ30の回転数を検出する回転センサ51を備えている。
またFET21a~FET21cのそれぞれの他端は、スイッチング素子20a~20cのオンオフによって、電動モータ30に流れるモータ電流のリップル成分を吸収するための平滑コンデンサ25a~25cがそれぞれ接続されている。FET22a~22cの他端は、それぞれシャント抵抗24a~24cを介して車両の設置電位部に接続されている。
なお、図1では電源リレー40の位置を3相ブリッジ回路を構成するスイッチング素子20a~20cのプラス側とコイル43の間に配置した例を示しているが、電源コネクタ7とコイル43の間に配置した構成でも良い。また図1ではコイル43を1つで構成しているが、発熱を分散させるために複数のコイルを直列に接続した構成でもよい。
マイクロコンピュータ11は、上記トルクセンサ6からの操舵トルク信号、回転センサ51で検出される回転検出信号、車両の走行速度信号などの車両側信号5、および電流検出回路13によるモータ電流信号から、FET駆動回路12に入力する制御信号を演算する。
電動モータ30の発生したトルクは、減速装置2を介してステアリング軸にアシストトルクとして加えられる。これにより、運転者によるハンドル1の操舵力は軽減されるというものである。なお図1では、電動モータ30の電機子巻線31u~31vがY結線される例を示したが、Δ結線されていても良い。
なお、この図2には電源リレー40を構成するFET41とFET42は図示されていないが、スイッチング素子20a~20cと同様にヒートシンク部70に設けられた凹部70aに埋め込んで配置されている。
ヒートシンク部70のもう一方の端面(フロント側)には、回転センサ51が設けられている。なお、回転センサ51はレゾルバを用いてもよいが、永久磁石とGMRセンサの組み合わせで構成してもよい。
制御基板10および電気的接続部材15を覆うようにカバー60がヒートシンク部70に設けられたヒートシンク連結ネジ穴部92(図5参照)に、ネジ101でネジ止めされる。なお、ヒートシンク部70とカバー60の接続は、ネジ止めに限らず、接着剤や、ネジと接着剤の併用などの方法でもよい。
カバー60は金属あるいは樹脂で構成され、このカバー60には、電源コネクタ7、車両側信号コネクタ8、トルクセンサ用コネクタ9、およびコイル43の配置空間が一体成型されている。
電気的接続部材15は平面状であり、その平面の大きさは制御基板10の平面的大きさと同じ、または同程度である。電気的接続部材15は、金属製のプラス側バスバー15aとマイナス側バスバー15bからなる通電用バスバーを樹脂等の絶縁部材15c上に配置するか、プラス側バスバー15aとマイナス側バスバー15bの一部、あるいは全部を樹脂等の絶縁部材15cでモールドして形成されている。
電気的接続部材15のプラス側バスバー15aとマイナス側バスバー15bは、電源コネクタ7を介してバッテリー4に接続される。プラス側バスバー15aとマイナス側バスバー15bは、それぞれが互いに近接して並行になるように配線され、さらにループを描くように配置されており、プラス側バスバー15aとスイッチング素子20a~20cのそれぞれのP端子28a~28cが、またマイナス側バスバー15bとスイッチング素子20a~20cのそれぞれのN端子29a~29cが接続される。
このような配線とすることで、よりバスバーのインダクタンスを下げることが可能となり、インダクタンスに起因するサージ電圧を抑制することができる。また、スイッチング素子20a~20cと電源リレー40をヒートシンク部70の全面に分散配置することが可能となるため、スイッチング素子20a~20cの温度上昇を均一化させることができる。これにより、モータ駆動制御装置3の信頼性をより向上させることができる。
電源リレー40とスイッチング素子20a~20bと平滑コンデンサ25a~25cは、リア側から見て上下に重ならない位置に配置される。
なお、図6は一例として平滑コンデンサ25a~25cを円周方向に並べて配置した構成を示しているが、配置方向は端面が内側、外側のいずれの方向となっていてもよく、また横置きに限らず、図7のように縦置きのいずれにしてよい。いずれの配置も平滑コンデンサ25a~25cがスイッチング素子20a~20bから発する熱の影響を受け難くなるため、より信頼性を向上させることができる。
図2に示すように、制御基板10にはマイクロコンピュータ11、FET駆動回路12を構成する制御素子、電流検出回路13、および制御素子への電源供給に必要な制御回路用コンデンサ14が実装されるが、マイクロコンピュータ11、FET駆動回路12、および電流検出回路13は制御基板10のリア側の面に、制御回路用コンデンサ14は制御基板10のフロント側の面で、平滑コンデンサ25a~25cが配置されていない空隙に配置する構造とする。
回転子鉄心34の回転軸中心には、シャフト80が圧入され、シャフト80の一端にはギヤ軸とのカップリングであるボス81が圧入されている。シャフト80は、2つの軸受71、72によって支持され、軸受71、72はカバー62に固定されて、回転子が回転自在になるような構造となっている、また、シャフト80のもう一方の端部には回転センサ51が設けられている。カバー62と固定子鉄心32は、フレーム63に焼きばめなどで固定されている。またフレーム63は、例えばアルミニウムで構成され、ヒートシンク部70に設けられたフレーム連結ネジ穴部91(図5参照)に、ネジ102でネジ止めされる。
次にこの発明の実施の形態2におけるモータ駆動制御装置3について図9に基づいて説明する。
実施の形態2の発明においては、実施の形態1と同様に各部品が実装され、電気回路も同一であり、図1および図2に示すような回路構成図と構造図は省略するが、図9は図6に相当するモータ駆動制御装置3に使用される各素子の位置関係を示した図である。
さらに電気的接続部材15のリア側の面から見て、平滑コンデンサ25a~25cとスイッチング素子20a~20cを上下に重ならない位置に配置することで、スイッチング素子20a~20cからの熱の影響を受け難くなるため、より信頼性を向上させることができる。
Claims (11)
- 電動パワーステアリング装置に用いられるモータを駆動制御する電動パワーステアリング用モータ駆動制御装置であって、
前記モータに電流を供給する複数のスイッチング素子と、これらスイッチング素子のオンオフによるリップル電流を低減するための平滑コンデンサと、前記スイッチング素子を駆動制御する駆動回路と制御回路用コンデンサを実装した制御基板と、前記制御基板からの制御信号を前記スイッチング素子に供給する制御信号線と、前記スイッチング素子と前記平滑コンデンサを電気的に接続する電気的接続部材と、前記スイッチング素子を埋め込んで配置するヒートシンク部を備え、
前記スイッチング素子と前記制御基板との間に前記電気的接続部材を配置すると共に、
前記電気的接続部材と前記制御基板との間に形成される空間に前記制御回路用コンデンサと前記平滑コンデンサを配置した
ことを特徴とする電動パワーステアリング用モータ駆動制御装置。 - 前記ヒートシンク部が前記スイッチング素子を埋め込んで配置するための凹部を有することを特徴とする請求項1に記載の電動パワーステアリング用モータ駆動制御装置。
- 前記ヒートシンク部の凹部に高熱伝導性の絶縁材を注入したことを特徴とする請求項2に記載の電動パワーステアリング用モータ駆動制御装置。
- 前記複数のスイッチング素子が前記ヒートシンク部に分散配置されるとともに、前記平滑コンデンサと前記スイッチング素子が、前記電気的接続部材の上面から見て重ならない位置に配置されていることを特徴とする請求項1から請求項3のいずれか1項に記載の電動パワーステアリング用モータ駆動制御装置。
- 前記平滑コンデンサの端面が、前記電気的接続部材の上平面に対して垂直になるように、前記平滑コンデンサを前記電気的接続部材に横置き配置したことを特徴とする請求項1から請求項4のいずれか1項に記載の電動パワーステアリング用モータ駆動制御装置。
- 前記電気的接続部材は、電源のプラス側電位およびマイナス側電位を接続する通電用バスバーと、この通電用バスバーを支持する絶縁部材で構成されたことを特徴とする請求項1から請求項5のいずれか1項に記載の電動パワーステアリング用モータ駆動制御装置。
- 前記電気的接続部材は、前記制御基板と同程度の平面部を有し、前記ヒートシンク部と当接するように配置されたことを特徴とする請求項6に記載の電動パワーステアリング用モータ駆動制御装置。
- 前記電動パワーステアリング用モータ駆動制御装置にバッテリーから流入する電流を遮断する電源リレーを備え、前記電源リレーが前記ヒートシンク部に埋設されて配置されていることを特徴とする請求項1から請求項7のいずれか1項に記載の電動パワーステアリング用モータ駆動制御装置。
- 前記複数のスイッチング素子と前記平滑コンデンサと前記電源リレーが、前記電気的接続部材の上面から見て重ならない位置に配置されていることを特徴とする請求項8に記載の電動パワーステアリング用モータ駆動制御装置。
- 前記スイッチング素子を配置するヒートシンク部がヒートシンク連結ネジ穴部を有し、前記ヒートシンク連結ネジ穴部の近傍に前記スイッチング素子を配置したことを特徴とする請求項1から請求項9のいずれか1項に記載の電動パワーステアリング用モータ駆動制御装置。
- 前記平滑コンデンサは、導電性高分子ハイブリッドアルミ電解コンデンサであることを特徴とする請求項1から請求項10のいずれか1項に記載の電動パワーステアリング用モータ駆動制御装置。
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Also Published As
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DE112015006036T5 (de) | 2017-10-05 |
DE112015006036B4 (de) | 2023-09-28 |
JPWO2016117144A1 (ja) | 2017-04-27 |
JP6026048B1 (ja) | 2016-11-16 |
US10106189B2 (en) | 2018-10-23 |
CN106856667A (zh) | 2017-06-16 |
US20170305456A1 (en) | 2017-10-26 |
CN106856667B (zh) | 2019-08-06 |
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