JP2001129522A - Motor drive device and garbage disposer using motor drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor drive device having a long life and a garbage disposer. SOLUTION: The motor drive device is equipped with a motor 1 and a temperature detecting means 2 which detects the temperature of a bearing part 1a of the motor 1. Thus it is possible to maintain the temperature of the bearing part 1a at a low level and thereby realize the long life of the motor 1 by making the number of revolutions of the motor 1 variable in response to the output of the means 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor driving device used for household appliances for general home use or business use, or to a garbage disposer having the motor driving device.

[0002]

2. Description of the Related Art In recent years, motor driving devices have been widely used in garbage disposal machines and the like, and high performance, long life, high quality, and the like have been demanded. In addition, the miniaturization of the product body has been progressing.

[0003] The life of the motor largely depends on the grease life of the bearing constituting the bearing.
The configuration and life of this bearing are as shown in FIGS. FIG. 4 is a configuration diagram of the bearing, and FIG. 5 shows the relationship between the life of the grease 1b and the bearing temperature, and shows the life time of the grease 1b with respect to each bearing temperature.
For example, when the bearing temperature is 90 ° C., the life of the grease 1b is estimated to be about 28,000 hours (the state shown by the broken line). Thus, the bearing temperature and the life of the bearing portion 1a are estimated.

[0004]

In a conventional motor drive device, if the life of the motor is to be prolonged, the temperature of the bearing (bearing portion) is controlled by a cooling means or the like during driving of the product. Although it is necessary to keep it low, it has been very difficult in many cases, as the size of the product has been reduced, it has become difficult to take up space due to the lack of space.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a motor drive device having a long life.

[0006]

In order to achieve the above object, an abnormality in the bearing is achieved by varying the number of revolutions of the motor in accordance with the output of temperature detecting means for detecting the temperature of the bearing of the motor. A longer service life can be realized by preventing temperature rise.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
A motor and temperature detecting means for detecting a temperature of a bearing portion of the motor, and by changing a rotation speed of the motor in accordance with an output of the temperature detecting means, the temperature of the bearing portion is kept low, and the length of the motor is reduced. The life is extended.

According to a second aspect of the present invention, there is provided a heater having a heater for heating dust, and the life of the motor is extended by varying the number of revolutions of the motor in accordance with the temperature of the bearing portion of the motor. Can also be extended.

According to a third aspect of the present invention, the temperature of the heater is varied according to the temperature of the bearing portion of the motor, thereby keeping the temperature of the bearing portion low, realizing the long life of the motor and realizing a product as a product. The service life can be extended.

[0010]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS.

First, the configuration will be described.

1 is a motor, 2 is a temperature detecting means arranged in contact with (buried in) a bearing part 1a which is a bearing part of the motor 1, and 3 receives a signal from the temperature detecting means 2,
This is control means for controlling the motor 1.

Next, this operation will be described.

The heat generated by the motor 1 includes heat generated by the motor itself and heat generated by external factors. At present, the miniaturization of the product body is progressing, and the heat generated by external factors cannot be ignored. In other words, even if the heat generation of the motor 1 itself is suppressed (the design is performed with a margin for the characteristics and the current flowing through the motor 1 is reduced), depending on the state of the ambient temperature of the motor 1, FIG.
As shown in the graph shown in FIG. Since the temperature of the bearing portion 1a greatly affects the service life of the bearing portion 1a, if the service life is reached, the temperature of the bearing portion 1a increases, and the grease 1b evaporates, making it impossible for the motor 1 to rotate smoothly. As a result, the load on the motor 1 increases, and the current flowing therewith increases. This causes a further rise in the temperature of the bearing portion 1a, causing the grease 1b to evaporate, thereby causing a vicious cycle in which the temperature rises.

It is very important to control the temperature of the bearing portion 1a. Once the temperature rises, the grease 1b evaporates at once, and the motor 1
Lock phenomenon.

Therefore, as shown in FIGS.
The temperature detection means 2 is provided in the bearing portion 1a, and the drive of the motor 1 is controlled while the temperature of the bearing portion 1a is managed by the control means 3. As the drive control, for example, when the temperature becomes high, the rotation of the motor 1 is increased, and it is assumed that the self-cooling fan is mounted on the motor 1.
An operation for increasing the cooling of the motor 1 is performed. Further, when the motor 1 does not have a self-cooling fan, the rotation of the motor 1 is reduced, and when there is a cooling-dedicated fan, control is performed to improve the cooling effect, such as operating the fan.

Furthermore, when the temperature of the bearing portion 1a of the motor 1 is increased, for example, when a heater or the like is provided, the operation of varying the temperature of the heater is controlled by the temperature of the bearing portion 1a. The same effect can be obtained by performing the operation.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

Here, the description of the same configuration as that of the first embodiment is omitted.

First, the configuration of the garbage disposal machine will be briefly described.

Reference numeral 4 denotes a container for holding the garbage for drying the garbage, 5 a heater for generating heat for drying the garbage, 6 a fan for sending the heat of the heater 5 to the garbage, 8 decomposes the odor generated when the garbage is dried
The deodorizing catalyst 7 is a suction fan for guiding the odor of garbage to the catalyst 8. Reference numeral 9 denotes a blade for stirring the garbage in the container 4, and reference numeral 10 denotes a stirring motor for operating the blade.

During processing of garbage, the air in the container 4 is sucked by the suction fan 7 to the catalyst 8 through arrows A, B, C, and D, is sucked by the suction fan 7 and then discharged to the outside. In the drying process, heat generated by the heater 5 is radiated to garbage by a fan 6 connected to the motor 1 and dried. By this operation, the garbage in the container 4 is dried.

In this case, the motor 1 receives the heat of the heater 5 through the fan 6 and the bearing 1a through the shaft 1c of the motor 1 as shown in FIG. Is increased by the heat of the heater 5. Since the heater 5 is often controlled at a temperature exceeding 100 ° C., the temperature of the bearing 1 a of the motor 1 also increases. Therefore, the motor 1 is controlled while the temperature of the bearing portion 1a is detected by the temperature detecting means 2. Thus, the garbage can be dried without exceeding the temperature of the bearing 1a of the motor 1 (for example, 90 ° C.).

Here, even if the temperature of the heater 5 is adjusted in accordance with the output of the temperature detecting means 2, the same effect can be obtained. In this case, assuming that the temperature limit of the bearing portion of the motor 1 is T1 (° C.) and the temperature adjustment of the heater 5 is T2 (° C.), it is more effective to perform control while maintaining the relationship of T1> T2.

Although the motor 1 has been described here, it goes without saying that the same applies to a motor drive device constituted by the suction motor 7 and the stirring motor 10.

[0026]

According to the first aspect of the present invention,
By varying the number of revolutions of the motor in accordance with the temperature of the bearing of the motor, the temperature of the bearing can be kept low and a long life of the motor can be realized.

According to the second aspect of the present invention, a long-life garbage disposal machine is provided by using a long-life motor for a garbage disposal machine for performing processing such as drying of garbage. be able to.

According to the third aspect of the present invention, the temperature of the heater is varied according to the temperature of the bearing portion of the motor, thereby keeping the temperature of the bearing portion low, realizing a long service life of the motor and producing a product. Can be extended.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a motor drive device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of the motor driving device.

FIG. 3 is a schematic configuration diagram of a garbage processing machine showing a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a conventional bearing unit.

FIG. 5 is a diagram showing a correlation between grease life and temperature.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Temperature detection means 3 Control means 4 Container 5 Heater 6 Fan 7 Suction motor 8 Catalyst 9 Stirring spring 10 Stirring motor

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02P 7/00 H02K 11/00 EF term (reference) 4D004 AA03 AC01 CA22 CA42 CA48 CB32 CC09 DA01 DA02 DA06 5H570 AA30 BB09 DD01 LL19 MM05 5H605 AA13 BB05 CC04 DD09 DD31 DD34 DD36 DD37 EA02 EA15 EA16 EA19 EB10 5H611 AA01 BB01 PP03 QQ04 TT01 UA05 UB01

Claims (3)

[Claims] 1. A motor drive device comprising: a motor; and temperature detecting means for detecting a temperature of a bearing of the motor, wherein the number of revolutions of the motor is varied according to an output of the temperature detecting means. 2. A garbage disposal machine comprising a heater for heating garbage and the motor drive device according to claim 1. 3. The garbage disposer according to claim 2, wherein the temperature of the heater is varied according to the output of the temperature detecting means.