JPS61276654A - Air conditioning unit - Google Patents

Abstract

PURPOSE:To make it possible to carry out a high precision position detection by installing magnetic resistance elements in motor driving devices and feeding back the positions of doors detected by the magnetic resistance elements. CONSTITUTION:A door 11 carries out changeover of an air intake port. Air taken in is heated by a heater 8, and is cooled depending on the opening degree of a door 21 to a suitable temperature by a cooler 9. Thus, the air is ventilated through respective blow-off ports by the opening or closing of doors 31, 32 and 33. Motors 1a, 2a and 3a are contained in motor driving devices 1, 2 and 3, and magnetic resistance elements 1b, 2b and 3b are provided therein. Signals of a sensor 6 and an operating switch 5 enter into a control circuit 4d, and a positional signal is emitted therefrom. The position of this signal is compared with the current position. When the former position deviates from the latter, the motor 2a is driven by a drive circuit 4a, and the door 21 is moved to a predetermined position to control the temperature of air. The positional signal knowing the current position detects a magnetic flux variation due to the rotation of the motor by the magnetic resistance element 3b, and is detected as a rotational pulse.Hence, it is possible to know the current position. With respect to the doors 11, 31, 32 and 33, similar procedures are carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an air passage control device in an air conditioner.

[Conventional technology]

In conventional air passage control, the opening/closing or opening degree of the door installed in the air passage is driven by a negative pressure drive device or a motor type drive device, and a variable resistor or variable resistor is installed in this device. With the position detection means of
The opening is controlled.

[Problem that the invention seeks to solve]

However, diversification of opening degrees is required for comfort control, and the detection means needs to be more complex and highly accurate.

[Means for solving problems]

The present invention uses a magnetic resistance element or the like as a position detection means to directly detect motor rotation pulses in a non-contact manner.
The door opening position is detected and the controller drives the motor until it reaches a predetermined pulse count position to control the door opening.

〔Example〕

Examples of the present invention will be described. FIG. 1 is a system diagram of an air conditioner. There is a door in the air passage of this device.
1, 21, and 31.32.33 are arranged. These doors are connected to motor drive devices 1, 2.3, and the opening/closing and opening degree of each passage is controlled to perform air conditioning. Door No. 11 switches the air intake port. 7 is a blower. The air taken in is transferred to heater 8.
warmed by Reference numeral 9 denotes a colander, which cools an appropriate amount of air depending on the degree of opening of the door 21, thereby bringing the air to an appropriate temperature and sending it downstream. Air outlets are installed downstream depending on the purpose, and ventilation is supplied from each outlet by opening and closing the doors 31, 32, and 33.

Each motor drive device 1, 2.3 includes a motor la, 2.
a, 3a are built-in, and each motor drive device includes a magnetoresistive element 1b, which is a motor pulse detection means.
2b and 3b are installed close to the motor. Reference numeral 4 denotes a controller for the air conditioner, which is composed of a motor rotation pulse waveform shaping circuit 4a, a comparison circuit 4b, a motor drive circuit 4C1, a control circuit 4d, and a sensor 6 for detecting external temperature, etc.
, and the operation switch 5.

FIG. 2 is a detailed diagram of the motor drive device. 1a is a motor, and 1b is a magnetic resistance element, which is disposed in the housing 15 in the vicinity of the motor 1a. 14 is a magnet, 13 is a rotor,
12 is an output shaft, 11 is a worm gear coupled to the output shaft, 16 is a worm wheel that engages with the worm gear 11, and 17 is an arm coupled to 16, which is connected to the door via a link (not shown).

The magnetoresistive element 1b has a power supply terminal lha.

lbc and a signal output terminal 1bb, which are connected to the controller 4.

The operation of this device will be explained. The operation of the door 21 will be explained. The signals from the sensor 6 and the operation switch 5 are
It enters the control circuit 4d and outputs a position signal to be moved. The comparison circuit 4b compares this signal with the current position, and if there is a difference, the drive circuit 4C drives the motor 2a. This moves the door 21 to a predetermined position and controls the temperature of the air. Here, the position signal for knowing the current position is obtained by detecting changes in magnetic flux due to rotation of the motor by the magnetoresistive element 2b, and is detected as a rotation pulse, thereby making it possible to know the current position.

Next, the same process is performed for the doors 11, 31, 32, and 33.

The rotation pulse detection means using the magnetoresistive elements 1b, 2b, and 3b of the present invention uses a magnetoresistive element as a magnetoelectric transducer, and can detect the rotation of the motor with high precision. As a result, the positional accuracy of the arm 17 after deceleration is significantly increased9, making it possible to control the door opening degree with high precision.

When the motor 1a rotates, at one position close to the motor, the lines of magnetic force change depending on the number of poles and rotation speed of the motor. According to the change in the magnetic lines of force, the signal output terminal 1b
The voltage at b changes. This voltage is shaped into a pulse signal by a waveform shaping circuit 4a and used as a position signal.

As another example, magnetoresistive elements 1b, 2b.

3b and a waveform shaping circuit or controller 4 may be built into the motor drive device.

Further, when the output voltage of the magnetoresistive element is high, the waveform shaping circuit 4a can be omitted.

In addition to a configuration in which changes in the magnetic lines of force of the motor are detected using a magnetic resistance element, a configuration may also be adopted in which a device (magnet) that generates magnetic lines of force is installed in a reduction gear, an arm, etc., and movement of the gear or arm is detected. Further, a magnetic resistance element may be installed inside the motor. In short, it may be installed anywhere within this device as long as the magnetic lines of force change according to the operation of the motor drive device.

[Effects of the Invention] As described above, according to the configuration of this embodiment, highly accurate position detection can be performed by simply installing the magnetoresistive element at one position close to the motor, and the configuration is simple and Compared to photoelectric detectors and the like, it is possible to provide an excellent device that enables highly reliable position detection without having to worry about contamination of elements with grease, oil, etc.

[Brief explanation of the drawing]

FIG. 1 is a horizontal configuration diagram showing one embodiment of the present invention, and FIG. 2 is a configuration diagram showing a part of the motor drive device shown in FIG. 1 in cross section. 1.2.3...Motor drive device, 4...Controller, lb, 2b, 3b...Magnetic resistance element (motor pulse detection means). Representative Patent Attorney Takashi Okabe Figure 1

Claims (1)

[Claims] 1. A motor drive device for driving a door of an air conditioner is provided, a magnetic resistance element is installed in the motor drive device, and the position of the door detected by the magnetic resistance element is fed back. An air conditioner featuring: 2. A motor drive device according to claim 1, characterized in that a magnetic resistance element is installed close to or inside the motor. 3. In the device according to claim 1, a magnetic force line generating means such as a resin magnet is installed in the gear or arm of the motor drive device, and a predetermined gap is provided at a location within the operating range of the gear or arm. A motor drive device having a magnetoresistive element installed.