JP2017093535A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect and control a motor rotation without using a hall IC and a magnet.SOLUTION: The washing machine comprises a structure in which, after a stop of energization to a motor 22 and during an inertial rotation of the motor 22 in an agitation step, the time when the rotation of the motor 22 stopped is estimated by a rotation number of the motor 22 calculated by detecting a pulse period of terminal voltage of a capacitor 27 by motor rotation number detection means 25 for a plurality of times, and after it is determined that the rotation is stopped, an output of the motor is switched from the agitation vane 17 to the washing and dewatering bin 16 by a clutch mechanism 12. Thus, an operation of the clutch mechanism 12 is controlled by detecting a stop of rotation of the motor 22 without using a hall IC and a magnet, and it is possible to reduce production cost and secure safety.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a washing machine that performs washing, rinsing, and dewatering processes.

  2. Description of the Related Art Conventionally, as this type of washing machine, a configuration has been proposed in which the position of a motor rotor is detected by a motor position detection means to control the rotation of the motor (see, for example, Patent Document 1).

  FIG. 6 is a longitudinal sectional view of a conventional washing machine described in Patent Document 1, and FIG. 7 is a block circuit diagram of the washing machine.

  6 and 7, a water receiving tub 64 is supported by a hanging rod 63 in the casing 62 so as to be supported by the suspension rod 63, and a washing tub 65 is rotatably included in the water receiving tub 64. Further, a stirring blade 66 for stirring clothes is rotatably disposed on the inner bottom of the washing tub 65. The stirring wing 66 and the washing tub 65 are driven by a motor 58 fixed to the outer bottom of the water receiving tub 64. It is selectively rotated.

  A clutch mechanism 67 is connected to the motor output shaft 69 of the motor 58. The clutch mechanism 67 rotates the stirring blade 66 in the stirring process via the speed reduction mechanism 68 with respect to the output of the motor output shaft 69 of the motor 58. In the dehydration process, the washing tub 65 is selectively switched.

  The motor 58 uses a direct current brushless motor, and includes a rotor 81 having a pair of permanent magnets 81a having different ring-like polarities and a stator 82 having a three-phase winding.

  The inverter circuit 54 includes an input capacitor 40, power switching means 41, and a current detection resistor 42. The power switching means 41 applies three-phase AC power to the motor 58.

  The position detection means 60 detects the position of the permanent magnet 81a by the Hall ICs 57a to 57c arranged to face the permanent magnet 81a of the rotor 81 at an electrical angle of 120 degrees.

  The control circuit 59 is composed of a microcomputer, and by turning the motor 58, the switching elements corresponding to the output signals of the Hall ICs 57a to 57c are turned on and off to control the motor 58. The number control is performed by the rotation control circuit 90.

  When the clutch mechanism 67 is switched, such as when shifting from the agitation process to the dehydration process, the signal from the position detection means 60 is input to the control circuit 59 after the motor 58 is turned off. Only when it is determined that 81 is stopped, it is determined that the clutch mechanism 67 can be switched, the clutch mechanism 67 is operated, and the process proceeds to the dehydration process.

Japanese Patent Laid-Open No. 11-239688

  However, the conventional configuration requires a plurality of very expensive Hall ICs and magnets, which increases the material cost and the number of assembly steps, and increases the manufacturing cost.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a washing machine that can reduce the manufacturing cost without using a Hall IC or a magnet.

  In order to solve the above-described conventional problems, the washing machine of the present invention includes a washing and dewatering tub having a stirring blade rotatably disposed at the center bottom, and a vibration isolating support within the housing, so that the washing and dewatering tub is rotatable. An outer tub contained in the motor, a motor for rotationally driving the stirring blade and the washing / dehydrating tub, a capacitor for driving the motor, and a motor rotational speed detecting means for detecting the rotational speed of the motor by a terminal voltage of the capacitor And a clutch mechanism for switching the output of the motor to the rotation of the stirring blade or the washing and dewatering tub, and various input settings provided in front of the upper part of the housing, and display operation for displaying setting contents and progress And control means for controlling the motor, the clutch mechanism, etc., and sequentially controlling each process such as washing, rinsing, and dehydration. The control means communicates with the motor in the stirring process. During the inertial rotation of the motor after the motor is stopped, the motor rotation speed detection means detects the pulse period of the capacitor terminal voltage a plurality of times and calculates the rotation stoppage of the motor. After estimating the time and determining that the rotation has stopped, the clutch mechanism is configured to switch the output of the motor from the stirring blade to the washing and dewatering tub.

  Accordingly, since the rotation of the motor is detected and the operation of the clutch mechanism is controlled without using a Hall IC or a magnet, the manufacturing cost can be reduced and safety can be ensured.

  Since the washing machine of the present invention detects and controls the rotation stop of the motor without using a Hall IC or a magnet, the manufacturing cost can be reduced and safety can be ensured.

The longitudinal cross-sectional view of the washing machine in embodiment of this invention Block diagram of the washing machine Circuit diagram of motor rotation speed detection means of the washing machine Timing chart showing operation of motor rotation number detecting means of the washing machine Operation flowchart of motor rotation number detection means of the washing machine Vertical section of a conventional washing machine Block diagram of the washing machine

A first invention includes a washing and dewatering tub having a stirring blade rotatably disposed at the center bottom, an outer tub that is supported in an anti-vibration manner inside the housing, and rotatably includes the washing and dewatering tub, the stirring wing, A motor for rotationally driving the washing and dewatering tub; a capacitor for driving the motor; motor rotational speed detecting means for detecting the rotational speed of the motor based on a terminal voltage of the capacitor; A clutch mechanism for switching to the rotation of the washing and dewatering tub, various input settings provided in front of the upper part of the housing, display operation means for displaying setting contents and progress, etc., and controlling the motor and the clutch mechanism And a control means for sequentially controlling each process such as washing, rinsing, dehydration, etc., and the control means performs inertial rotation of the motor after energization of the motor is stopped in the stirring process. In the motor rotation speed detection means, the rotation speed of the motor is estimated from the rotation speed of the motor calculated by detecting the pulse cycle of the capacitor terminal voltage a plurality of times, and it is determined that the rotation has stopped. After that, by configuring the clutch mechanism to switch the output of the motor from the stirring blade to the washing and dewatering tub,
Without using a Hall IC or magnet, the rotation of the motor is detected and the operation of the clutch mechanism is controlled, so that manufacturing costs can be reduced and safety can be ensured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a washing machine according to an embodiment of the present invention, FIG. 2 is a block diagram of the washing machine, and FIG. 3 is a circuit diagram of a motor rotation number detecting means of the washing machine. is there.

  In FIGS. 1 and 2, the housing 14 supports the outer tub 18 by a plurality of suspensions 19 in a suspended manner. The washing / dehydrating tub 16 is rotatably included in the outer tub 18, and a stirring blade 17 for stirring clothes is rotatably disposed on the inner bottom of the washing / dehydrating tub 16.

  A lid 15 that can be freely opened and closed is disposed at substantially the center of the upper portion of the housing 14, and the laundry is put into and taken out of the washing and dehydrating tub 16 by opening and closing the lid 15.

  A display operation unit 10 is provided at an upper portion of the casing 14 at a position in front of the lid 15, and various input settings are performed by the display operation unit 10 to display setting contents and progress.

  Further, a water supply valve 9 for supplying water to the outer tub 18 is provided at a rear position above the housing 14, and a drain valve 11 for draining the washing water in the outer tub 18 is provided at the bottom of the outer tub 18. Is provided.

  The clutch mechanism 12 is connected to the motor output shaft 43 of the motor 22, and the clutch mechanism 12 connects the output of the motor output shaft 43 of the motor 22 to the drive shaft 21 of the stirring blade 17 via the speed reduction mechanism 20. Or selectively switched so as to be directly connected to the drive shaft of the washing / dehydrating tub 16, and the washing / dehydrating tub 16 or the stirring blade 17 is driven by the motor 22.

  In addition, the motor 22 is constituted by a DC brushless motor, and the rotor 22a connected to the motor output shaft 43 and the three-phase winding control the rotation speed of the motor 22 by the terminal voltage of the capacitor 27 (see FIG. 3). It is something to detect. The detection of the rotational speed of the motor 22 will be described later with reference to FIG.

  The control means 24 controls the motor 22, the water supply valve 9, the drain valve 11, the clutch mechanism 12, etc., and sequentially controls a series of steps of washing, rinsing and dehydration.

  In FIG. 3, the motor 22 is an AC induction motor capable of normal and reverse rotation, and a capacitor 27 is connected to the normal and reverse side coil.

  When the forward rotation SW 28a is turned on, AC 100V is applied to the motor 22, the motor 22 rotates forward, and when the reverse SW 28b is turned on, the motor 22 reverses. When washing and rinsing, the motor 22 is rotated forward and reverse, and when dehydrating, the motor 22 is rotated forward.

  Next, the motor rotation speed detection means 25 will be described.

  A light emitting diode of a photocoupler 25b is connected in parallel to the forward and reverse coils of the motor 22 via a resistor 25a. A current flows through the light emitting diode only in one direction according to the potential difference between both ends of the coil. A substantially pulsed current flows through the transistor side of the photocoupler 25 b, the waveform is shaped by the transistor circuit 25 c, and 0-5 V high and low signals are input to the control means 24 from the DC 5 V power supply.

  When the forward rotation SW 28 a or the reverse SW 28 b is on, an on / off signal of AC 100 V power supply frequency 60 Hz or 50 Hz is input to the control means 24.

  About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  FIG. 4 is a timing chart showing the operation of the motor rotation speed detection means of the washing machine in the embodiment of the present invention, and FIG. 5 is an operation flowchart of the motor rotation speed detection means of the washing machine.

  In FIG. 4, the case where the power supply frequency is 50 Hz will be described. When the energization instruction is high, a voltage synchronized with AC 100 V 50 Hz is generated at both ends of the capacitor 27 connected to the motor coil and is input to the control means 24. The period of the pulse signal is 20 ms.

  When the energization instruction to the motor 22 changes from high to low, that is, when the forward rotation SW 28a is turned from on to off, the motor 22 becomes a generator motor by inertial rotation of the rotor 22a of the motor 22, and according to the number of poles AC voltage is induced. By measuring the pulse period at this time, it is possible to measure the rotational speed of the rotor 22a during inertia.

  In the present embodiment, the motor 22 has a pulse cycle of 20 ms when the washing and dewatering tub 16 is rotated at 800 r / min.

  In FIG. 5, when the energization of the motor 22 is turned off after completion of the stirring process (step S200) and the rotor 22a rotates by inertia, the capacitor terminal voltage attenuates after A seconds from the energization off of the motor 22, as shown in FIG. Measurement of the pulse period is started (step S201).

  The high and low signals generated by the motor rotation number detection means 25 based on the alternating voltage induced by the inertial rotation of the motor 22 are input to the control means 24, and are input in the microcomputer constituting the control means 24. The frequency (the number of rotations of the motor 22) is calculated by taking the reciprocal of the cycle of the high and low signals, and Hz1 (= 1 / B) is stored (step S202).

  Thereafter, the pulse period is measured again C seconds after the energization of the motor 22 is turned off (step S203). In the microcomputer, Hz2 (= 1 / D) calculated in the same manner as Hz1 is stored (step S204).

  Next, the estimated stop time E seconds until the rotation of the rotor 22a of the motor 22 stops is estimated from Hz1 and Hz2 (step S205).

  The calculation of the estimated stop time E seconds from Hz1 and Hz2 is determined based on experiments, and the calculation formula is stored in the program of the microcomputer. Then, after E seconds when it is determined that the rotation of the rotor 22a of the motor 22 has stopped (YES in Step S206), the clutch mechanism 12 is switched from the stirring operation to the dehydrating operation (Step S207), and the process proceeds to the dehydrating step. .

As described above, in the present embodiment, during the inertia rotation of the motor 22 after the energization of the motor 22 is stopped in the stirring process, the motor rotation speed detection means 25 causes the pulse of the terminal voltage of the capacitor 27. The rotation stop time of the motor 22 is estimated from the rotation speed of the motor 22 calculated by detecting the cycle a plurality of times, and after determining that the rotation has stopped, the clutch mechanism 12 uses the stirring blade 17 to wash the motor output. By switching to the cum dewatering tank 16, the rotation of the motor 22 is detected and the operation of the clutch mechanism 12 is controlled without using a Hall IC or magnet, thereby reducing the manufacturing cost and increasing the safety. Can be secured.

  As described above, the washing machine according to the present invention detects the motor rotation stop and controls the operation of the clutch mechanism without using a Hall IC or a magnet, thereby reducing the manufacturing cost and improving the safety. Since it can be ensured, the present invention can be applied to other uses such as a washing machine that requires a rotational speed detection means.

DESCRIPTION OF SYMBOLS 10 Display operation means 12 Clutch mechanism 14 Case 16 Washing and dewatering tank 17 Stirring blade 18 Outer tank 22 Motor 24 Control means 25 Motor rotation speed detection means 27 Capacitor

Claims (1)

An outer tub that is supported in a vibration-proof manner inside the housing, a washing and dewatering tub that is rotatably disposed in the outer tub, a stirring blade that is rotatably disposed at the bottom of the washing and dewatering tub, and the stirring A motor for selectively rotating the blades and the washing / dehydrating tub, motor rotation number detecting means for detecting the rotation number of the motor, and switching the output of the motor to rotation of the stirring blade or the washing / dehydrating tub A clutch mechanism and a control means for controlling the motor, the clutch mechanism, and the like to sequentially control each process such as washing, rinsing, and dehydration. The control means stops energization of the motor in the stirring process. After the inertial rotation of the motor, the motor rotation speed detection means detects the pulse period of the capacitor terminal voltage a plurality of times and calculates the rotation stop time of the motor. I guessed, after the rotation is determined to have stopped, the washing machine to switch to the washing and dewatering tank from the stirring blade the output of the motor at the clutch mechanism.

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