WO2012140774A1

WO2012140774A1 - Power converter-integrated motor for passenger conveyer

Info

Publication number: WO2012140774A1
Application number: PCT/JP2011/059404
Authority: WO
Inventors: 良一猪俣
Original assignee: 三菱電機株式会社
Priority date: 2011-04-15
Filing date: 2011-04-15
Publication date: 2012-10-18

Abstract

A converter unit and an inverter unit respectively have a plurality of SiC MOSFETs and a plurality of SiC Schottky barrier diodes, and an inverter drive unit has a high withstand voltage IC. The configuration components of the converter unit and the inverter unit are thermally connected to a heat dissipating fin block. A wiring board and the heat dissipating fin block are fixed to a base, such as an aluminum board, by means of a screw that penetrates the wiring board and the heat dissipating fin block. The base is placed on the floor of a machine room. The motor main body and a power converter are disposed adjacent to each other in the horizontal direction on the upper surface of the base.

Description

Power converter integrated motor for passenger conveyor

The present invention relates to a power converter integrated motor for a passenger conveyor in which a motor and a power converter are integrally combined.

For example, a conventional apparatus as shown in Patent Document 1 includes a motor that drives a plurality of steps with variable voltage and variable frequency, and a power converter (inverter unit) provided at a predetermined distance from the bottom surface side of the motor, The heat pipe which fixed the power converter, and the base which is located in the bottom face of a heat pipe and is attached to the floor of the machine room of a passenger conveyor are provided.

In such a conventional apparatus, the self-cooling fan of the motor can efficiently cool not only the motor but also the capacitor and the heat radiation means. In addition to this, since the wiring board having the power converter, the rectifying means and the capacitor is disposed between the motor and the heat radiating means, the configuration of the unit can be made relatively compact.

JP 2009-102082 A

However, in the conventional apparatus as described above, since the wiring board is disposed between the motor and the heat radiating means and has a laminated structure as a whole, a unit of a power converter integrated motor (inverter integrated motor) When the power converter is separated from the whole, it is necessary to remove the motor body from the entire unit of the power converter integrated motor. For this reason, there has been a problem that it takes time and labor to inspect and replace the life-long parts inside the power converter.

The present invention has been made to solve the above-described problems. The power converter can be easily separated from the entire unit, and the workability of maintenance and inspection and parts replacement can be improved. It is an object of the present invention to obtain a power converter integrated motor for a passenger conveyor that can shorten the length.

A power converter integrated motor for a passenger conveyor according to the present invention includes a pedestal provided in a machine room of a truss, a plurality of switching elements, and a plurality of diodes, and at least one of the plurality of switching elements and the plurality of diodes. A converter unit, one of which is formed of a wide band gap semiconductor, and an inverter unit having a plurality of switching elements and a plurality of diodes, and at least one of the plurality of switching elements and the plurality of diodes is formed of a wide band gap semiconductor. And a power converter provided on the upper surface of the pedestal, and having a high voltage IC and an inverter driving unit for driving switching of the inverter unit incorporated in the inverter unit, and the power Front to be next to the transducer horizontally Provided on the upper surface of the pedestal, and a motor main body to provide a driving force to the step by receiving power from the inverter unit.

It is a block diagram which shows a part of escalator by Embodiment 1 of this invention. It is a block diagram which shows the electric constitution of the escalator of FIG. It is a circuit diagram which shows the inverter part and inverter drive part of FIG. It is a perspective view which shows the power converter of FIG. It is a side view which shows the power converter of FIG. It is a perspective view which shows the power converter integrated motor of FIG. It is a perspective view which shows the power converter cover of FIG. It is a perspective view which shows the state which removed the power converter from the power converter integrated motor of FIG. It is a top view which expands and shows a part of wiring board of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing a part of an escalator (passenger conveyor) according to Embodiment 1 of the present invention.
In FIG. 1, a machine room 1 a is provided at the upper floor side end of the truss 1. Inside the machine room 1a, a control device 100, a drive unit 2, a main shaft 3, a step drive sprocket 4, and an upper floor driven sprocket 5 are provided. The control device 100 is fixed to the side surface of the machine room 1a. The driving machine 2 is fixed to the floor of the machine room 1a. The drive machine 2 includes a power converter integrated motor 6, a speed reducer 7, and a drive machine sprocket 8.

The power converter integrated motor 6 has a motor body 9 and a power converter (inverter device) 10. The motor body 9 is driven by the power received from the power converter 10. The motor body 9 has an output shaft (rotating shaft). The output shaft of the motor body 9 is connected to the speed reducer 7. The drive machine sprocket 8 is attached to the output shaft of the speed reducer 7. The speed reducer 7 decelerates the rotation of the output shaft of the electric power converter integrated motor 6 and rotates the drive sprocket 8.

The main shaft 3 is arranged on the lower floor side in the machine room 1a with a space from the drive unit 2. The step drive sprocket 4 is attached to the main shaft 3. The step drive sprocket 4 is connected to a drive machine sprocket 8 via a drive chain 11. The upper floor side driven sprocket 5 is also attached to the main shaft 3. The upper floor driven sprocket 5 is rotated as the step drive sprocket 4 rotates.

Furthermore, an endless step drive chain 13 for connecting a plurality of steps 12 is wound around the upper floor side driven sprocket 5. The step drive chain 13 is also wound around a lower floor driven sprocket (not shown) provided at the lower floor side end of the truss 1.

Therefore, in such an escalator, the rotation of the motor body 9 in the electric power converter integrated motor 6 is decelerated by the speed reducer 7, and the drive machine sprocket 8 is driven by the step drive sprocket 4 and the upper floor side driven via the drive chain 11. Power is transmitted to the sprocket 5. As a result, the step drive chain 13 circulates and moves in a substantially elliptical shape within the truss 1, and a plurality of steps 12 travel.

Next, the electrical configuration of the escalator will be described. FIG. 2 is a block diagram showing an electrical configuration of the escalator of FIG. In FIG. 2, the power converter 10 includes an input terminal 14, a converter unit (rectifying means) 15, a capacitor 16, an inverter unit 17, an output terminal 18, an inverter driving unit 19, and a control terminal 20.

The input terminal 14 is electrically connected to a three-phase AC power source (commercial AC power source) 101. The AC voltage of the three-phase AC power supply 101 is applied to the converter unit 15 via the input terminal 14. The converter unit 15 converts the AC voltage into a DC voltage including a pulsation component. The capacitor 16 smoothes the pulsation of the DC voltage.

The inverter unit 17 converts the DC voltage smoothed by the capacitor 16 into an AC voltage having a three-phase variable voltage and variable frequency. Further, the inverter unit 17 applies the converted AC voltage to the motor main body 9 via the output terminal 18. The inverter drive unit 19 is incorporated in the inverter unit 17. In addition, a control command from the control device 100 is input to the inverter drive unit 19 via the control terminal 20. Furthermore, the inverter drive part 19 switches ON / OFF of MOSFET (switching element) of the inverter part 17 according to a control command.

Next, FIG. 3 is a circuit diagram showing the inverter unit 17 and the inverter drive unit 19 of FIG. In FIG. 3, the inverter unit 17 further includes SiC / MOSFETs T1 to T6, SiC / Schottky barrier diodes D1 to D6, and resistance elements 24 to 29. Similarly to the inverter unit 17, the converter unit 15 also includes a plurality of SiC / MOSFETs and a plurality of SiC / Schottky barrier diodes (not shown). Each of the SiC MOSFET T1, T3, and T5 is an upper arm switching element. SiC MOSFET T2, T4 and T6 are lower arm switching elements, respectively.

The anodes of the SiC Schottky barrier diodes D1 to D6 are connected to the source terminals of the SiC MOSFETs T1 to T6, respectively. The cathodes of the SiC Schottky barrier diodes D1 to D6 are connected to the drain terminals of the SiC MOSFETs T1 to T6, respectively. That is, the SiC Schottky barrier diodes D1 to D6 are connected in antiparallel to the SiC MOSFETs T1 to T6, respectively. The resistance elements 24 to 29 are connected in series to the gate terminals G1 to G6 of the SiC / MOSFETs T1 to T6, respectively.

The inverter drive unit 19 includes a clamp diodes 21 to 23, a high voltage IC (HVIC) 30 for driving a switching element, a power source 31 serving as a voltage source of the high voltage IC, diodes 32 to 34, and a capacitor. 35 to 37 and a constant voltage diode 38.

The high voltage IC 30 includes circuit configurations (functional blocks) of an input buffer b1, level shifts b2 to b4, upper arm side drive circuits b5 to b7, lower arm side drive circuits b8 to b10, an overcurrent detector b11, and an error signal generator b12. ) Is included. The upper arm side drive circuits b5 to b7 drive SiC MOSFET T1, T3, T5, respectively. Lower arm side drive circuits b8 to b10 drive SiCＳｉMOSFET T2, T4, T6, respectively.

Here, the high voltage IC 30 includes UPi, UNi, VPi, VNi, WPi, WNi, UPo, VPo, WPo, UNo, VNo, WNo, VB1, VB2, VB3, VS1, VS2, VS3, VS0, OC, Fo, VCC and VSS are provided as a plurality of input / output terminals. UPi, VPi, WPi and UNi, VNi, WNi are drive signal input terminals, respectively. UPo, VPo, and WPo are upper arm switching element drive signal output terminals for outputting drive signals for SiC MOSFET T1, T3, and T5, respectively.

UNo, VNo, and WNo are lower arm switching element drive signal output terminals that output drive signals for SiC MOSFETs T2, T4, and T6, respectively. VB1, VB2, and VB3 are floating power source positive side input terminals, respectively. VS1, VS2, and VS3 are floating power source negative side input terminals and upper arm switching element drive signal reference output terminals, respectively. VS0 is a lower arm switching element drive signal reference output terminal. OC is a current detection terminal. Fo is an error output terminal. VCC and VSS are power terminals on the positive side and the negative side, respectively.

The clamp diode 21 is connected between the upper arm switching element drive signal reference output terminal VS1 of the inverter driver 19 and the lower arm switching element drive signal reference output terminal VS0 of the inverter driver 19. The clamp diode 22 is connected between the upper arm switching element drive signal reference output terminal VS2 of the inverter driver 19 and the lower arm switching element drive signal reference output terminal VS0 of the inverter driver 19. The clamp diode 23 is connected between the upper arm switching element drive signal reference output terminal VS3 and the lower arm switching element drive signal reference output terminal VS0 of the inverter drive unit 19.

In such a circuit configuration, the voltages V (VS1-VS0), V (VS2) between the upper arm switching element drive signal reference output terminals VS1, VS2, VS3 and the lower arm switching element drive signal reference output terminal VS0. When -VS0) and V (VS3-VS0) become negative voltages, the

corresponding clamp diodes

21, 22, and 23 are turned on. As a result, the voltages V (VS1-VS0), V (VS2-VS0), and V (VS3-VS0) are kept at the ON voltages of the

clamp diodes

21, 22, and 23, respectively.

In FIG. 3, S1, S2, and S3 are connection nodes on the source side of the SiC-MOSFETs T1, T3, and T5, respectively. S0 is a common connection node on each source side of SiC MOSFET T2, T4, T6. P is a power supply terminal for applying a positive power supply voltage to the inverter circuit. N is a power supply terminal for applying a negative power supply voltage to the inverter circuit. U, V, and W are output terminals of the inverter unit 17.

Here, in general, the minimum value of each withstand voltage of the upper arm switching element drive signal reference output terminals VS1, VS2, VS3 of the high withstand voltage IC 30 is [(potential of the lower arm switching element drive signal reference output terminal VS0) −5]. ] About bolts. That is, voltages V (VS1-VS0), V (VS2-VS0) between the upper arm switching element drive signal reference output terminals VS1, VS2, VS3 and the lower arm switching element drive signal reference output terminal VS0, The minimum rated breakdown voltage of V (VS3-VS0) is approximately −5V, respectively.

Accordingly, the

clamp diodes

21, 22, and 23 are not particularly limited, but it is preferable to use, for example, a general diode having an on-voltage of about 0.7V to 2V. By using such a diode, when a negative voltage is applied between the upper arm switching element drive signal reference output terminals VS1, VS2 and VS3 and the lower arm switching element drive signal reference output terminal VS0, the gap between them is increased. The voltage is clamped to the ON voltage of the

clamp diodes

21, 22, 23, that is, about −0.7V to −2V.

The

clamp diodes

21, 22, and 23 are provided in the vicinity of the reference output terminals VS0 and VS1, VS2, and VS3 of the high voltage IC 30, and the

clamp diodes

21, 22 are connected to the terminals VS0, VS1, VS2, and VS3 of the high voltage IC 30. , 23 is more preferably as short as possible.

Next, the operation of the inverter unit 17 having the circuit configuration shown in FIG. 3 will be described. When a negative voltage that may cause destruction of the high voltage IC 30 is applied between the upper arm switching element drive signal reference output terminals VS1, VS2, VS3 and the lower arm switching element drive signal reference output terminal VS0 of the high voltage IC 30 Only, the

clamp diodes

21, 22, 23 are turned on, and the voltages V (VS1-VS0), V (VS2-VS0), and V (VS3-VS0) between these terminals VS1, VS2, VS3 and VS0 are set. Clamp each to ON voltage (0.7V ~ 2V).

Therefore, the voltages V (VS1-VS0), V (VS2-VS0), and V (VS3-VS0) are about -0.7V to -2V, respectively. As a result, the voltages V (VS1-VS0), V (VS2-VS0), and V (VS3-VS0) have the rated breakdown voltage minimum value -5V between the terminals VS1, VS2, VS3 and VS0 of the high breakdown voltage IC30, respectively. Never fall below.

As described above, the inter-terminal voltage when a negative voltage is applied between the upper arm switching element drive signal reference output terminals VS1, VS2, VS3 and the lower arm switching element drive signal reference output terminal VS0 of the high voltage IC 30. V (VS1-VS0), V (VS2-VS0), and V (VS3-VS0) are about −0.7V to −2V, respectively. As a result, the inter-terminal voltages V (VS1-VS0), V (VS2-VS0), and V (VS3-VS0) are the minimum rated withstand voltage -5V between the terminals VS1, VS2, VS3 and VS0 of the high withstand voltage IC30. Therefore, the breakdown voltage of the high voltage IC 30 can be prevented.

Next, the structure of the power converter 10 will be described. FIG. 4 is a perspective view showing the power converter 10 of FIG. FIG. 5 is a side view (viewed along arrow V in FIG. 4) showing power converter 10 in FIG. 4 and 5, a power converter 10 has a converter unit 15 and an inverter unit 17 mounted on one main surface (the lower surface in FIG. 4), and a capacitor 16 and an output on the other main surface (the upper surface in FIG. 4). It has a wiring board 40 on which the terminals 18 are mounted, and a radiating fin block 41 in which a plurality of blades are provided between a pair of aluminum plates opposed in the vertical direction.

The wiring board 40 is arranged on the heat radiation fin block 41 so that the components (switching elements and the like) of the converter unit 15 and the inverter unit 17 are in contact with the upper surface of the heat radiation fin block 41. That is, the component parts of the converter unit 15 and the inverter unit 17 are thermally connected to the radiating fin block 41. The wiring board 40 and the heat radiating fin block 41 are fixed to a base 42 such as an aluminum plate, for example, by screws 43 passing through them. The pedestal 42 is installed on the floor of the machine room 1a.

Further, the wiring board 40 is electrically connected to the input terminal 14 attached to one end face in the longitudinal direction of the radiating fin block 41 via a conductor (bus bar) 44. Further, the wiring board 40 is electrically connected to the control terminal 20 attached to the other end surface in the longitudinal direction of the heat dissipating fin block 41 via the wiring member 45.

Next, the positional relationship between the motor body 9 and the power converter 10 will be described. FIG. 6 is a perspective view showing the power converter integrated motor 6 of FIG. The motor body 9 and the power converter 10 are disposed on the upper surface of the base 42 so as to be adjacent to each other in the horizontal direction. Here, the motor body 9 includes a motor cover 50, a rotor (not shown), a stator (not shown), an output shaft (rotating shaft) 51, and a self-cooling fan 52. The power converter 10 is arranged at an interval in the axial direction of the output shaft 51 from the inner surface of the motor cover 50 of the motor body 9.

The rotor, stator and self-cooling fan 52 are accommodated in the motor cover 50. One end of the output shaft 51 protrudes from the inside of the motor cover 50 to the outside and is connected to the speed reducer 7. The other end of the output shaft 51 is disposed in the inner part of the motor cover 50. In addition, a plurality of vent holes (long holes) 50a are formed at intervals in the vertical direction on one end surface (the right side surface in FIG. 6) of the output shaft 51 of the motor cover 50 in the axial direction. Furthermore, a vent 50b is also formed in the other axial end surface (the left surface in FIG. 6) of the output shaft 51 of the motor cover 50.

That is, as shown in FIG. 6, the power converter 10 is arranged so as to intersect with the extension shaft of the output shaft 51 so as to hit the airflow generated by the rotation of the self-cooling fan 52 of the motor body 9. Further, the radiation fin block 41 is disposed so as to be orthogonal to the axial direction of the output shaft 51 of the motor body 9. Further, as shown in FIGS. 6 and 7, the power converter 10 is covered with a power converter cover 46 in which a plurality of vent holes (long holes) 46 a are provided on both side surfaces and the back surface.

Here, as the output shaft 51 of the motor body 9 rotates, the self-cooling fan 52 rotates, and air flows in the direction of arrow A in FIG. Therefore, an air flow path is formed between the air vent 46a of the power converter cover 46, the plurality of blades of the heat dissipation fin block 41, the air vent 50b of the motor cover 50, and the air vent 50a of the motor cover 50 in this order. The heat of the power converter 10 and the motor body 9 is dissipated by the airflow in the air flow path. Moreover, the heat of the power converter 10 and the motor main body 9 is transmitted to the floor of the machine room 1a via the pedestal 42 and dissipated.

Next, a method for separating (removing) the power converter 10 from the power converter integrated motor 6 will be described. First, in the state shown in FIG. 6, the power converter cover 46 can be removed by removing a screw for fixing the power converter cover 46. In this state, the power converter 10 can be detached from the pedestal 42 by removing the screw 43 penetrating the wiring board 40 and the radiation fin block 41 and removing the wiring member 53 from the output terminal 18 of the inverter unit 17. .

Therefore, as shown in FIG. 8, the power converter 10 can be separated from the power converter integrated motor 6 independently of the motor body 9. In the state where the motor body 9 and the power converter 10 are integrated, the wiring member 53 is connected to the output terminal 18 of the wiring board 40 as shown in FIG.

Next, the operation of the power converter integrated motor 6 will be described. Now, when an escalator start command is generated by the control device 100, the converter unit 15 rectifies the AC voltage of the three-phase AC power supply 101 and converts it into a DC voltage. The DC voltage from the converter unit 15 is applied to the inverter unit 17 via the capacitor 16. The DC voltage is converted into an AC voltage having a variable voltage and a variable frequency by the inverter unit 17, and the AC voltage is applied to the motor body 9. Thereby, the motor main body 9 is driven. Then, the step 12 is moved up and down by the driving force of the motor body 9.

Further, as the motor body 9 is driven to rotate, the self-cooling fan 52 rotates, and an air current as shown by an arrow A in FIG. 6 is generated. The motor body 9 is cooled by this airflow. At the same time, the capacitor 16 and the radiating fin block 41 are cooled by the airflow entering the inside of the power converter cover 46 from the vent 46 a of the power converter cover 46. For this reason, the inverter part 17 and the converter part 15 which were thermally connected to the radiation fin block 41 are also cooled rapidly.

As described above, according to the first embodiment, each of the converter unit 15 and the inverter unit 17 has a plurality of SiC-MOSFETs and a plurality of SiC-Schottky barrier diodes, and the inverter driving unit 19 has a high voltage IC 30. . MOSFETs (switching elements) and diodes formed of such wide band gap semiconductors such as SiC have high voltage resistance and high allowable current density. For this reason, it is possible to reduce the size of the MOSFET and the diode. Then, by using these miniaturized switching elements and diodes, the power converter 10 incorporating these elements can be miniaturized. Therefore, the converter unit 15, the inverter unit 17, and the inverter drive unit 19 can be reduced in size as compared with the conventional device as shown in Patent Document 1.

Further, the power converter 10 having the downsized converter unit 15, the inverter unit 17, and the inverter driving unit 19 is provided on the upper surface of the base 42 so as to be adjacent to the motor body 9 in the horizontal direction. With this configuration, the power converter 10 can be easily separated without removing the motor main body 9 from the entire unit of the power converter integrated motor 6, and the conventional apparatus adopting the laminated structure as shown in Patent Document 1 is used. Compared with this, it is possible to improve the workability of maintenance inspection and part replacement, and to shorten the work time.

Furthermore, the converter unit 15 and the inverter unit 17 are placed on the upper surface of the radiating fin block 41 and are thermally connected. Further, the lower surface of the radiating fin block 41 is thermally connected to the floor of the machine room 1a through the pedestal 42. Thereby, the heat generated from the converter unit 15 and the inverter unit 17 is radiated by the radiating fin block 41, and the heat is also radiated to the floor of the machine room 1 a through the pedestal 42. Therefore, the heat generated from the converter unit 15 and the inverter unit 17 can be efficiently dissipated.

Further, the power converter 10 is arranged so as to intersect with the extension shaft of the output shaft 51 so as to hit the airflow generated by the rotation of the self-cooling fan 52 of the motor body 9. With this configuration, both the motor main body 9 and the power converter 10 can be efficiently cooled by the airflow generated by the rotation of the self-cooling fan 52. In addition to this, since an interval is provided between the motor main body 9 (the inner surface of the motor cover 50) and the power converter 10, the airflow generated by the rotation of the self-cooling fan 52 is not only the motor main body 9, Since the capacitor | condenser 16 is cooled, it can cool more efficiently.

Furthermore, since the wide band gap semiconductor has high heat resistance, it is possible to reduce the size of the radiating fin block 41 and the air cooling of the water cooling section, thereby further reducing the size of the power converter 10. In addition, the heat pipe of the conventional apparatus as shown in Patent Document 1 can be omitted.

In addition, since the power loss of the wide band gap semiconductor is low, the efficiency of the switching element and the diode can be increased, and thus the efficiency of the power converter 10 can be increased.

In the above embodiment, the escalator power converter integrated motor has been described. However, the present invention can also be applied to a power converter integrated motor for a moving sidewalk.

In the above embodiment, the switching element and the diode are formed of SiC (silicon carbide). However, the material of the switching element and the diode is not limited to SiC. For example, a gallium nitride-based material or diamond is used in addition to SiC as long as it is a wide band gap semiconductor having a larger band gap than silicon. May be.

Furthermore, although it is desirable that both the switching element and the diode are formed of a wide band gap semiconductor, either one of the switching element and the diode may be formed of a wide band gap semiconductor. Even in this case, the effects described in this embodiment can be obtained.

Claims

A pedestal provided in the machine room of the truss;
Having a plurality of switching elements and a plurality of diodes, at least one of the plurality of switching elements and the plurality of diodes formed of a wide band gap semiconductor, and having a plurality of switching elements and a plurality of diodes, In order to drive the switching of the inverter unit having at least one of a plurality of switching elements and a plurality of diodes having an inverter unit formed of a wide bandgap semiconductor and a high breakdown voltage IC and being incorporated in the inverter unit A power converter provided on the upper surface of the pedestal,
A power converter integrated motor for a passenger conveyor, comprising: a motor main body that is provided on an upper surface of the pedestal so as to be adjacent to the power converter in the horizontal direction, and that receives electric power from the inverter unit and applies driving force to the steps.
The power converter is attached to the pedestal so that a lower surface thereof is in contact with an upper surface of the pedestal, the converter unit and the inverter unit are mounted on the upper surface, and is thermally connected to the converter unit and the inverter unit. The power converter integrated motor for passenger conveyor according to claim 1, further comprising a heat dissipation fin block.
The motor body has a rotating shaft for applying a driving force to the step, and a self-cooling fan that is provided at one end of the rotating shaft and generates an air flow along with the rotation of the rotating shaft,
The power converter for a passenger conveyor according to claim 1 or 2, wherein the power converter is arranged so as to intersect with an extension shaft of the rotating shaft so as to hit an airflow generated by rotation of the self-cooling fan. Integrated motor.
The motor body is covered by a motor cover provided with a vent;
The power converter integrated motor for passenger conveyor according to claim 3, wherein the power converter is covered with a power converter cover that is provided with a vent and is separable independently from the motor cover.
The power converter integrated motor for passenger conveyors according to any one of claims 1 to 4, wherein the wide band gap semiconductor is silicon carbide, a gallium nitride-based material, or diamond.