JPH09140083A - Battery cooling fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any spark even in the course of the current application of a battery cooling fan motor, by forming the fan motor out of a DC brushless motor having both a control circuit for controlling the current application changeovers of its windings in response to the positions of its permanent magnet rotor and a group of switches comprising semiconductor elements. SOLUTION: A current application changeover controlling circuit 140 controls a group of switches 150 in response to the positions of a permanent magnet rotor 130. Then, the group of switches 150 perform efficiently the current application changeovers of the respective phase windings of a fan motor to sustain its rotation, cooling a battery 190 through the accompanied rotation of a fan 100 thereby. That is, the current application changeovers of windings 120 are performed by the group of switches 150 comprising semiconductor elements to use a DC brushless motor as the fan motor. Thereby, any spark generated between a conventional brush and commutator can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor for ventilating and cooling a battery such as a lead storage battery for an electric vehicle that generates flammable gas.

[0002]

2. Description of the Related Art In recent years, the development of electric vehicles as pollution-free vehicles has been promoted while the environmental destruction of the earth has become a social problem.

A battery such as a lead storage battery is usually used as a power source of an electric vehicle, but in this case, a fan is required for ventilation of hydrogen gas generated during charging and cooling of a battery which has generated heat.

FIG. 4 is a sectional view showing the structure of a conventional battery cooling fan motor. In FIG. 4, 100
Is a fan, 101 is a fan casing, 402 is a motor frame, 410 is an iron core having a plurality of slots, 42
0 is a multi-phase winding provided on the iron core 410, 43
Reference numeral 0 denotes a commutator, and the plurality of commutator pieces 431 forming the commutator 430 are connected to the windings 420 of the respective phases. 440 is a permanent magnet, 450 is a brush, 190 is a battery, 191 is a brush 450 and a battery 190.
, 170 is a rotor shaft, and 180 is a bearing.

In the conventional motor, the voltage of the battery 190 is applied to the winding through the brush 450 and the commutator 430 through the lead wire 191. The motor starts to rotate when a voltage is applied to the winding and electricity is applied. Along with that, the commutator pieces 431 that come into contact with the brushes 450 are sequentially changed,
The energization of the winding 420 of each phase is efficiently switched, the motor continues to rotate efficiently, and the fan rotates accordingly to cool the battery.

[0006]

However, the conventional battery cooling fan motor described above has the following problems.

That is, when the motor is energized, the brush 450 of the fan motor and the commutator piece 431 are energized and switched while voltage is being applied, so that a spark is generated. Further, when the winding is short-circuited due to a loss of the insulating layer of the winding, sparks may occur.

Further, since hydrogen gas is generated by a chemical reaction during charging of the battery, it is necessary to completely seal the battery and the fan motor in a hermetically sealed state, and the mounting is complicated and costly.

The present invention solves the above-mentioned conventional problems. An atmosphere in which a highly flammable gas is generated by adopting a structure in which no spark is generated even when the motor is energized or a structure in which the generated spark is cut off from the outside It is an object of the present invention to provide a fan motor for cooling a battery that can be used in a battery.

[0010]

In order to solve these problems, a battery cooling fan motor according to claim 1 of the present invention comprises a fan, a fan casing, an iron core having a plurality of slots, and an iron core slot. A stator having a wound winding, a permanent magnet rotor arranged so that the magnetic pole surface of the stator faces each other, and energization for controlling winding switching according to the position of the permanent magnet rotor. DC by a switching control circuit and a switch group composed of semiconductor elements that switch energization in response to a command from the energization switching control circuit
It is composed of a brushless motor.

According to a second aspect of the present invention, there is provided a fan motor for cooling a battery, a stator having a plurality of slots of a DC brushless motor, a stator having windings provided in the slots of the core, and an energization switching control circuit. The fan motor for battery cooling according to claim 1, wherein the switch group and the switch group are integrally formed of resin.

A battery cooling fan motor according to a third aspect of the present invention is the battery cooling fan motor according to the first or second aspect in which the windings provided on the iron core are salient pole windings.

A battery cooling fan motor according to a fourth aspect of the present invention is a battery cooling fan motor in which a valve is provided at an outlet of a fan casing.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 100 is a fan, 101 is a fan casing, 102 is a motor frame, 110 is an iron core having a plurality of slots, 120 is a plurality of windings provided on the iron core 110, and 130 is a permanent magnet rotor. ,
140 indicates the winding 12 depending on the position of the permanent magnet rotor 130.
An energization switching control circuit for controlling energization switching of 0,
Reference numeral 150 denotes a switch group formed of semiconductors, and the winding 12 of each phase is supplied in response to an instruction of the energization switching control circuit 140
The energization switching of 0 is performed. Reference numeral 160 is a circuit board that contacts the winding 120, the energization switching control circuit 140 and the switch group 150, 170 is a rotor shaft, 180 is a bearing, 190 is a battery, and 191 is a lead wire that connects the battery and the circuit board.

The energization switching control circuit 140 controls the switch group 150 according to the position of the permanent magnet rotor 130. The switch group 150 efficiently switches the energization of the windings of each phase, whereby the rotation of the motor is continued, and the fan rotates accordingly to cool the battery.

By switching the energization of the winding with a switch group composed of semiconductor elements, it is possible to prevent sparks generated between the brush and the commutator as in the conventional example.

Further, as shown in FIG. 2, the iron core 210 and the winding wire 22 are
0, energization switching control circuit 240, and switching group 25
By integrally molding 0 and the circuit board 260 with a resin, sparks generated by the motor can be shielded from an external highly flammable gas and an explosion can be avoided.

Further, as shown in FIG. 3, the winding 320 wound on the iron core 310 is formed by salient pole winding, so that the windings of each phase do not contact each other, and even when the insulating layer of the winding is damaged. A short circuit between windings of each phase is eliminated, and sparks can be prevented.

Further, by providing a valve at the outlet of the fan casing so that air can be blown from the motor side and the gas does not flow back into the motor from the outlet, highly flammable gas is generated. It is possible to prevent the gas from entering the inside of the motor due to the action of the valve even in the atmosphere.

According to the configuration of claim 1 of the present invention, by switching the energization of the winding by the semiconductor element, the spark generated between the brush and the commutator as in the conventional example can be prevented.

According to the second aspect of the present invention, the spark generated by the motor is shielded from the highly flammable gas from the outside to prevent the explosion.

According to the third aspect of the present invention, the windings of each phase are not in contact with each other, and even if the insulating layer of the windings is lost, the short circuit between the windings of each phase is eliminated and sparks are prevented. be able to.

According to the fourth aspect of the present invention, it is possible to prevent the gas from entering the inside of the motor by the action of the valve even in an atmosphere in which highly flammable gas is generated.

[0025]

As described above, according to the first aspect of the present invention, the motor is constituted by the DC brushless motor, so that the spark generated between the brush and the commutator as in the conventional example can be prevented.

According to a second aspect of the present invention, the iron core, the windings, the energization switching control circuit, the switching group and the circuit board are integrally molded with resin, so that sparks generated by the motor can be generated from an external highly flammable gas. Can be shut off.

According to a third aspect of the present invention, the windings wound on the iron core are salient pole windings, so that the windings of each phase do not contact each other, and even if the insulating layer of the windings is lost, A short circuit due to the windings of is eliminated, and sparks can be prevented.

According to the fourth aspect of the present invention, by providing the discharge port of the fan casing, it is possible to prevent the gas from entering the inside of the motor by the action of the valve even in an atmosphere where highly flammable gas is generated.

As a result of the above, it is possible to realize a battery cooling fan motor which can be used in highly flammable gas and has excellent safety.

[Brief description of the drawings]

FIG. 1 is a structural cross-sectional view of a battery cooling fan motor according to an embodiment of the present invention.

FIG. 2 is a structural cross-sectional view of a battery cooling fan motor integrally molded with resin according to an embodiment of the present invention.

FIG. 3 is a model diagram of salient pole winding according to an embodiment of the present invention.

FIG. 4 is a sectional view showing the structure of a conventional battery cooling fan motor.

[Explanation of symbols]

 100 Fan 101 Fan Casing 102 Motor Frame 103 Outlet Valve 110 Iron Core 120 Winding 130 Permanent Magnet Rotor 140 Energization Switching Control Circuit 150 Switch Group 160 Circuit Board 170 Rotor Shaft 180 Bearing 190 Battery 191 Lead Wire

Claims (4)

[Claims] 1. A fan motor for battery cooling, comprising a fan, a fan casing and a motor, wherein the motor has an iron core having a plurality of slots, and a stator having windings provided in the slots of the iron core, A permanent magnet rotor arranged to face the magnetic pole surface of the stator, an energization switching control circuit for controlling energization switching of the winding according to the position of the permanent magnet rotor, and a command for the energization switching control circuit A fan motor for cooling a battery, which is a DC brushless motor including a switch group configured by a semiconductor that switches energization in accordance with the above. 2. A battery cooling fan motor according to claim 1, wherein the stator of the DC brushless motor, the energization switching control circuit, and the switch group are integrally molded of resin. 3. A DC brushless motor, wherein the winding provided on the iron core is salient pole winding.
Alternatively, the battery cooling fan motor according to claim 2. 4. A battery cooling fan motor comprising a fan, a fan casing and a motor, characterized in that a valve is provided at an outlet of the fan casing.