JP5508778B2 - Inverter unit-integrated rotating electrical machine - Google Patents

Description

  The present invention relates to an inverter device-integrated rotating electrical machine device, and more particularly to a device that operates as a generator when a vehicle travels (when an engine is operating) and operates as a starter when the engine is stopped.

  In recent years, reduction of carbon dioxide emissions from vehicles has been promoted to prevent global warming, and as a countermeasure, engine stop (idling stop) when the vehicle is stopped is being studied. Various systems are considered as an idling stop mechanism, and among them, a system for starting an engine with a conventional vehicle generator has been proposed. In order to drive the vehicular generator as an electric motor, an inverter device is required. By integrating this with the vehicular generator, a small and light vehicular generator / engine starter is obtained.

  In the conventional method of driving a vehicular generator as an electric motor, an inverter device that converts the DC power of the battery into AC power is required for driving. However, since this inverter device is less susceptible to heat than other components, when it is integrated with a vehicle generator and made smaller, the temperature rise of the inverter device increases and there is a risk of exceeding the heat resistance temperature of the inverter device. It was. Conventionally, as described in Japanese Patent Application Laid-Open No. 2004-294992, cooling air is sucked from the axial direction of the inverter device, passes through the inverter device, and then flows into the housing of the motor, thereby increasing the cooling efficiency. Therefore, it is necessary to arrange a large number of radiating fins, and there are problems such as an increase in the axial dimension of the entire apparatus and a cost due to the arrangement of the radiating fins.

Japanese Patent Application Laid-Open No. 2004-294992

  The problem to be solved by the present invention is to suppress the increase in cost or to suppress the enlargement of the apparatus and to improve the cooling performance.

  In order to achieve the above object, an air suction hole provided in a joint portion between a rear housing of a rotating electrical machine and a case of an inverter device, a ventilation hole provided in an axial wall surface of the rear housing, and a rear housing The cooling performance is improved by allowing the cooling air to smoothly pass through the cooling air passage formed by the discharge hole provided in the radial wall surface.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing a cost increase or suppression of the enlargement of an apparatus, a cooling performance can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The figure (with an air guide) showing the flow of the cooling air by the fan of the rotary electric machine at the time of engine operation of the said Example. The figure showing the flow of the cooling air by the fan of the rotary electric machine at the time of engine operation of the above embodiment (no air guide). The figure showing the change of the semiconductor element temperature by an air guide. The block diagram of the vehicle using the inverter apparatus integrated rotary electric machine apparatus of this Embodiment.

  Next, the structure of an inverter apparatus-integrated dynamoelectric machine according to an embodiment of the present invention will be described.

  FIG. 1 is a cross-sectional view of an inverter unit-integrated dynamoelectric machine according to an embodiment of the present invention. The stator 1 of the rotating electrical machine 100 is housed in the housing space of the front housing 2 and the rear housing 3, and the outer periphery of the stator 1 is covered with the front housing 2. In order to improve the heat conduction between the outer periphery of the stator 1 and the front side housing 2, a resin having a good thermal conductivity may be inserted between the outer periphery of the stator 1 and the front side housing 2.

  The rotor 4 uses a Rundel-type rotor core 5 and outputs a field magnetic flux necessary for power generation and driving by applying a field current to the field coil via a brush and a slip ring. This field current is supplied from a control device in the inverter device, and outputs a field current optimum for power generation and driving. The output of the field magnetic flux can be improved by inserting a magnet between the rotor cores.

  The rotor core 5 of the rotor 4 is fixed to a shaft, and the shaft is supported by bearings attached to the front side housing 2 and the rear side housing 3. A pulley is fixed to the tip of the shaft, and the rotating electrical machine 100 operates as a generator by being driven by a belt that is hung on the crankshaft pulley of the engine.

  When the rotating electrical machine 100 is operated as a starter, the engine crankshaft pulley is driven via a belt to start the engine. The inverter device has a structure in which a control device and a power control switching semiconductor element 8 are molded in a resin case 7. A cover 9 is attached to the rear side of the case 7 of the inverter device 90 to protect the brush and the heat sink. Here, the rotating electrical machine 100 and the inverter device are coupled together by the rear housing 3 and the case 7 to be integrated.

Front suction hole 10a in the radial direction toward the wall surface on the front side housing 2, the front-side discharge hole 12a is provided on the shaft Direction wall. Furthermore the binding moiety of the rear housing 3 and the case 7 and a gap is provided as a rear-side suction hole 10b, the radial direction toward the wall surface of the rear housing 3 holes serving as vent holes 11, axis Direction wall Is provided with a discharge hole 12b. A cooling air can pass between the rear housing 3 and the case 7 through the rear suction hole 10b.

  The rear-side suction hole 10b is formed by the outer wall of the rear-side housing 3 and the outer wall of the case 7 facing each other. It is desirable that at least one of the outer wall of the rear side housing 3 and the outer wall of the case 7 is flat, preferably the opposing surfaces thereof are flat. In addition, you may make it form the surface facing the axial direction wall surface of case 7 from the edge part of the said facing surface to the opening part 11 so that it may become flat. Thereby, as shown in FIG. 2 described later, since the inflow loss of the inflow air can be reduced in the rotating electrical machine 100, the inflow air can be increased, and the cooling efficiency can be improved.

  The axial cross-sectional area of the gap forming the rear suction hole 10b is desirably larger than the opening area of the opening. Thereby, inflow air can be prevented from staying in the space formed by the outer wall of the rear housing 3 and the outer wall of the case 7.

  The axial gap d between the case 7 and the rear housing 3 is A / (2 × π × R) <d <10 mm, where A is the diameter R of the rear housing 3 and the opening area of the opening. It is desirable to be within the range. This allows the flow rate of the incoming air to be optimized for cooling.

  A fan 6 is attached to the end surface of the rotor core 5 of the rotor 4. When the rotating electrical machine 100 is operating as a generator, the fan 6 rotates to take in cooling air from the rear side suction hole 10 b, and While passing through the gap between the side housing 3 and the case 7 and cooling the semiconductor element 8, the semiconductor element 8 is led to the ventilation hole 11 and flows into the rotating electrical machine.

  Cooling air flowing into the rotating electrical machine from the ventilation holes 11 is discharged outside the rotating electrical machine from the discharge holes 12b while cooling the stator 1. An air guide 13 is attached between the suction hole 10b and the discharge hole 12b. The air guide 13 is integrated with the rear housing 3, but may be integrated with components such as the inverter device 90 and the cover 9.

  FIG. 2 shows the flow of cooling air by the fan of the rotating electrical machine where the air guide 13 is installed. Since the air guide 13 is attached, the discharged air discharged from the discharge hole 12b can be guided away from the suction hole 10b, so that the heated discharge air can be sucked again from the suction hole 10b. The cooling efficiency can be improved. The air guide has a bent portion 13a bent toward the discharge hole 12b. As a result, the heated exhaust air can be further prevented from being sucked into the suction hole 10b again.

  FIG. 3 shows the flow of cooling air by the fan of the rotating electrical machine where the air guide 13 is not installed. When the air guide 13 is not attached, the high-temperature air discharged from the discharge hole 12b is sucked from the suction hole 10b, and the rotor 1 and the inverter device cannot be sufficiently cooled.

  FIG. 4 shows changes in the semiconductor element temperature depending on whether or not the air guide is attached. When the air guide is attached compared to the case without the air guide, the increase in the temperature of the semiconductor element is suppressed and cooling can be performed efficiently.

  The inverter device 90 is provided with a power control switching semiconductor element 8. For example, a MOS-FET is used as the power control switching semiconductor element 8. In this embodiment, in order to energize a large current during driving, a plurality of power control switching semiconductor elements 8 are connected in parallel for each arm to increase the current capacity.

  Further, during power generation, the loss is reduced as compared with the conventional diode rectification method by controlling the switching timing of the power control switching semiconductor element 8 to perform synchronous rectification. The power control switching semiconductor element 8 is attached to an aluminum cooling plate, and is cooled by taking in cooling air from the outside by a fan 6 attached to the rotor 4.

  FIG. 5 is a block diagram of a vehicle in which the inverter unit-integrated dynamoelectric device of the present embodiment is used instead of the conventional vehicle power generation device. Between the pulley of the rotating electrical machine device 21 and the crankshaft pulley 221 of the engine 22, a rotation driving belt 222 is wound around.

  When the engine is started by the key, the engine 22 is started by a conventional vehicle starter (starter motor) 23. In the idling stop state after the vehicle is warmed up, the rotating electrical machine device 21 operates as a starter to restart the engine 22. When restarting the engine using the rotating electrical machine device 21, the crankshaft pulley 221 of the engine is driven via the belt 222, and the engine 21 is driven to a rotational speed at which the engine 21 completes explosion.

  When the engine 22 is restarted, the pulley is also rotated by the rotation of the crankshaft pulley 221, and the rotating electrical machine device 21 operates as a normal generator to supply power to the battery 24 and the vehicle-side electrical component. The idling stop operation is controlled by the vehicle-side controller 25 and a controller built in the inverter device 90 of the rotating electrical machine apparatus. In this way, the rotating electrical machine device 21 automatically performs idling stop when the vehicle is stopped, so that the fuel efficiency can be improved over the conventional vehicle.

  The present embodiment is a method suitable for a rotating electrical machine for power generation and engine starting, but can also be applied to means for reducing engine vibration and means for assisting driving force during vehicle acceleration.

DESCRIPTION OF SYMBOLS 1 Stator 2 Front side housing 3 Rear side housing 4 Rotor 5 Rotor core 6 Fan 7 Case 8 Switching semiconductor element 9 for power control Cover 10a Front side suction hole 10b Rear side suction hole 11 Ventilation hole 12a Front side discharge hole 12b Rear side Discharge hole 13 Air guide 21 Rotating electrical machine device 22 Engine 23 Vehicle starter 24 Battery 25 Vehicle side controller 90 Inverter device 100 Rotating electrical machine 221 Crankshaft pulley 222 Belt

Claims (3)

A rotor, a stator disposed opposite to the rotor via a rotation gap, a fan fitted to a rotation shaft of the rotor, and the rotating electrical machine side housing the rotor, the stator, and the fan A rotating electrical machine device comprising a housing;
An inverter circuit comprising: an inverter circuit that controls driving of the rotating electrical machine and output power of the rotating electrical machine; and an inverter-side housing that houses the inverter circuit,
The rotating electrical machine housing is, in the radial wall surface of the support portion for supporting is formed a rotary shaft of said rotor, an opening is formed,
In the inverter device, the rotation is performed so that the inverter-side housing faces the axial wall surface through a space and an air suction hole connected to the space by the inverter-side housing and the rotating electrical machine-side housing is provided. Fixed to the electrical equipment,
Cooling air flows into the rotating electrical machine side housing from the air suction hole through the space and the opening as the fan rotates,
The rotating electrical machine housing has an axial and axial wall surface substantially in parallel to the formation of the rotary shaft,
Before Symbol axial wall surface, air discharge hole for discharging the cooling air flowing in from the opening is formed,
Further prior Symbol axial wall surface has an air guide for guiding projecting from those該径direction wall and the cooling air to the air suction hole,
The air guide, the axial wall or al projects, and an inverter-integrated rotating electric machine having a bent portion that is bent toward the front Symbol air discharge hole side. The inverter device-integrated dynamoelectric device according to claim 1,
Before the inverter housing and the opposing surfaces of Ki径direction wall surfaces, the end of the opposing surfaces to said opening, an inverter-integrated rotating electric machine system which is formed to be flat. The inverter device-integrated dynamoelectric device according to claim 1 or 2,
The inverter circuit of the inverter device includes a MOS-FET type transistor, and is an inverter device-integrated rotating electrical machine device that performs synchronous rectification when the rotating electrical machine device performs a power generation operation.

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