JP2013013223A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner excellent in use feeling by instantaneously starting a fan motor after receiving a starting instruction of the vacuum cleaner.SOLUTION: The vacuum cleaner includes an inverter circuit with a fan and a function for driving the fan, and control means with a function for implementing positioning and stopping running after deceleration of a fan motor after a stopping command is input from the outside, thereby achieving rapid startup for excellent use feeling, positive starting and high reliability.

Description

  The present invention relates to a vacuum cleaner including a motor and a fan motor having a drive circuit for controlling the number of rotations thereof.

  In recent years, in vacuum cleaners that use AC power from a power supply to drive a motor directly connected to a fan and perform cleaning by using the suction force of air generated thereby, its good maintainability and cleanliness of exhaust For this reason, vacuum cleaners using brushless motors have been put into practical use. An inverter is used to drive the brushless motor, and the rotation speed is controlled by changing the frequency of the AC output (see, for example, Patent Document 1).

  Moreover, in a motor drive device using a brushless DC motor using a general magnet and an inverter device for driving the same, the magnetic pole position of the motor is detected and synchronized with the magnetic pole position in order to drive the motor reliably. It is necessary to supply the alternating current to the motor.

  For this purpose, a sensor such as an encoder is used as the magnetic pole position detection means. However, in the case of a product such as a vacuum cleaner, a magnetic pole position detection means using an inexpensive Hall sensor instead of such an expensive encoder. Etc. are used. Thus, the brushless DC motor can be accurately driven by grasping the magnetic pole position of the brushless DC motor and supplying the AC power synchronized with the magnetic pole position by the inverter.

JP-A-11-336696

  However, in a vacuum cleaner composed of a fan motor that drives such a brushless DC motor with an inverter device, in particular, in the case of a device that uses magnetic pole position detection means using an inexpensive Hall sensor as magnetic pole position detection means, Since the magnetic pole position of the motor can be detected only with low accuracy at the time of starting, it is difficult to secure the starting torque. Therefore, in order to detect the magnetic pole position with high accuracy and obtain a sufficient starting torque to start the motor smoothly, positioning for fixing the magnetic pole position of the rotor by applying a direct current to the motor is required.

  However, since positioning at the time of startup takes time, in the case of a fan motor of a vacuum cleaner, it takes a lot of time to start the vacuum cleaner, and there is a problem that the vacuum cleaner has a poor user experience. .

  The present invention has been made in view of such a point, and an object of the present invention is to provide an electric vacuum cleaner including a brushless DC motor and a fan motor having a drive circuit for controlling the number of rotations thereof. The object is to realize a vacuum cleaner with excellent usability that can instantly start a fan motor after a vacuum cleaner activation instruction.

In order to solve the conventional problem, a vacuum cleaner of the present invention includes a fan motor including a fan and a brushless DC motor that drives the fan, an inverter circuit having a function of driving the fan motor, The vacuum cleaner includes a control unit that controls the inverter circuit and has a function of positioning the brushless DC motor of the fan motor when the fan motor is stopped.

  As a result, the motor is positioned when the operation is stopped, and a vacuum cleaner with excellent usability that can instantly start the fan motor after the start instruction of the vacuum cleaner is realized.

  Moreover, the vacuum cleaner of the present invention includes a fan motor including a fan and a brushless DC motor that drives the fan, an inverter circuit having a function of driving the fan motor, an inverter circuit, and an inverter. The electric vacuum cleaner includes a control unit having a function of positioning the brushless DC motor of the fan motor after the power is input to the circuit and before the start command of the fan motor is input.

  Thereby, the positioning of the motor is performed before the start instruction, and after the start instruction of the vacuum cleaner, the fan motor is started instantly, and a vacuum cleaner with excellent usability is realized.

  The vacuum cleaner may include control means for performing positioning by supplying a direct current from the inverter circuit to the brushless DC motor.

  As a result, the magnetic pole position of the rotor of the brushless DC motor, which is a fan motor, can be reliably set to a predetermined position, and a highly reliable vacuum cleaner that can be stably and reliably started is realized. .

  The vacuum cleaner may be provided with control means for performing positioning by supplying a direct current in a predetermined pattern to the brushless DC motor from the inverter circuit and then supplying a direct current in another pattern.

  Thereby, it is possible to reliably set to a predetermined position regardless of the initial magnetic pole position of the rotor of the brushless DC motor that is a fan motor, and a highly reliable vacuum cleaner that is stably and reliably activated. Is realized.

  In the electric vacuum cleaner, a fan motor including a fan and a brushless DC motor that drives the fan, an inverter circuit having a function of driving the fan motor, the inverter circuit, and a stop command are input. And a control means having a function of braking and decelerating the brushless DC motor of the fan motor.

  As a result, when the vacuum cleaner is stopped, the brushless DC motor, which is a fan motor, can be stopped in a short time, and a highly reliable vacuum cleaner in which positioning for the next start-up is reliably performed. Realized.

  The electric vacuum cleaner may be provided with a control unit that performs deceleration by outputting a direct current from the inverter circuit to the brushless DC motor of the fan motor.

  As a result, a highly reliable vacuum cleaner is realized in which reliable reduction is performed without breaking the circuit without generating power to the brushless DC motor, which is a fan motor.

  The vacuum cleaner may include a control unit that performs deceleration by outputting an alternating current having a phase that does not generate regenerative power from the inverter circuit to the brushless DC motor of the fan motor.

  As a result, a highly reliable vacuum cleaner is realized in which reliable reduction is performed without breaking the circuit without generating power to the brushless DC motor, which is a fan motor.

  As described above, according to the present invention, a highly reliable vacuum cleaner that can be quickly started up by reliably positioning the motor before the start of operation, and that is excellent in feeling of use and can be reliably started. Can be realized.

The block block diagram of the drive circuit of the vacuum cleaner which concerns on this embodiment Same as above, operation flowchart when the vacuum cleaner is stopped in the control means of the vacuum cleaner Schematic diagram showing an example of the direction of motor current and the positional relationship between the stator and the rotor when braking the vacuum cleaner Schematic diagram showing an example of the direction of the motor current and the positional relationship between the stator and the rotor when positioning the vacuum cleaner Same as above, the operation flowchart when the vacuum cleaner is turned on in the control means of the vacuum cleaner Same as above, a relationship diagram showing the transition of the rotation speed of the vacuum cleaner fan motor during the operation of the control means of the vacuum cleaner

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block configuration diagram of a driving circuit of a vacuum cleaner according to this embodiment.

  The alternating current power supplied from the alternating current power source 20 is temporarily converted to direct current by the rectifier circuit 23 and the smoothing capacitor 24 provided in the drive circuit 21 in the vacuum cleaner. Then, it supplies to the inverter part comprised by the switching elements 25a-30a with which the free-wheeling diodes 25b-30b were equipped in parallel.

  The inverter unit has a three-phase series circuit composed of switching elements on the upper arm side and switching elements on the lower arm side constituted by the switching elements 25a to 30a, and the interconnection point between the upper arm and the lower arm in these series circuits is The fan motor 22 as a load is connected.

  The control means 31 is composed of a microcomputer, and in particular, using a timer function provided therein, the switching element 25a to 25 is configured so that the inverter unit outputs AC power that causes the fan motor 22 to rotate at a desired rotational speed. Control the switching of 30a.

  As a switching method, a general pulse width modulation (PWM) method in which the output voltage is controlled by the time width of the drive pulse of the element is used. In addition, as the switching elements 25a to 30a, for example, devices capable of high-speed switching such as IGBTs are used.

Thus, the control means 31 outputs the switching pattern for producing the alternating current output to the fan motor 22 by pulse width modulation (PWM) in the switching elements 25a-30a. By rotating the fan motor 22 at a desired number of rotations with such a configuration, the suction force of the vacuum cleaner is generated to realize the function as a vacuum cleaner.

  Next, FIG. 2 shows an operation flowchart when the vacuum cleaner is stopped in the control means of the vacuum cleaner according to the present embodiment. When it is determined in step S101 that a stop instruction has been input from the outside during operation of the vacuum cleaner, in step S102, a brake is applied to decelerate the operation of the vacuum cleaner.

  FIG. 3 is a schematic diagram showing an example of the direction of the motor current when the brake is applied and the positional relationship between the stator and the rotor. When the brake is applied in this way, the drive circuit 21 outputs a three-phase voltage so that a direct current flows from the V phase and the W phase to the U phase. The positional relationship of the magnetic flux of the stator of the fan motor 22 at that time is set as shown in the figure. As a result, the rotor of the fan motor 22 is decelerated by the force of stopping at the position corresponding to the position of the magnetic flux.

  Next, in step S103, after determining that the motor has stopped by a method such as time measurement, the rotor is positioned in step S104.

  FIG. 4 is a schematic diagram showing an example of the motor current direction and the positional relationship between the stator and the rotor when positioning is performed. In this embodiment, positioning is performed in two stages. This is because in the case of only one stage, there is a possibility that the rotational force may be minute depending on the initial position of the rotor, which may prevent positioning. On the other hand, when the positioning at the second stage is performed, even if the positioning cannot be performed without rotating at the first stage due to the initial position of the rotor, the positioning is reliably completed because a rotational force is generated at the second stage.

  First, in the first stage, the drive circuit 21 outputs a three-phase voltage so that a direct current flows from the V phase and the W phase to the U phase. The positional relationship between the stator and the rotor of the fan motor 22 at that time is set as shown in the figure. Next, in the second stage, the drive circuit 21 outputs a three-phase voltage so that a direct current flows from the W phase to the U phase and the V phase. At that time, the rotor of the fan motor 22 rotates 60 degrees, and the positional relationship between the stator and the rotor is set reliably as shown in the figure. As a result, a driving torque can be reliably applied at the next start-up, and a highly reliable electric vacuum cleaner with no start-up failure is realized.

  Next, in step S105, the completion of positioning is stored in the positioning storage means 32. Thereby, it is possible to determine whether or not to perform positioning before starting the next vacuum cleaner.

The transition diagram showing transition of the rotation speed of the vacuum cleaner fan motor at the time of the control means operation | movement of the vacuum cleaner which concerns on this embodiment is shown in FIG. When a stop instruction is input from the outside at time t0 from the state where the fan motor is rotating at the rotation speed F0, the brake is applied to stop the operation of the vacuum cleaner, the fan motor is decelerated, and the rotation speed Decreases.
Thereafter, the rotor stops at time t1, and the fan motor 22 stops rotating. After the rotation stops, positioning is performed until time t2. Thereby, the position of the rotor is fixed at a predetermined position, and the drive torque can be reliably applied at the next start-up.

  FIG. 5 shows an operation flowchart when the vacuum cleaner is turned on in the control means of the vacuum cleaner according to this embodiment. In step S201, it is detected that power is input to the power cable of the vacuum cleaner, for example, by increasing the control voltage and securing the voltage of the control means. Thus, when it is detected that the power is turned on, in step S202, information on whether or not the positioning stored in the positioning storage means 32 has been completed is determined.

  If the positioning has been completed, the next step S204 enters the start instruction waiting state, and when the start instruction is input, the normal operation is started. On the other hand, if the positioning is not completed at the time of the previous stop of the vacuum cleaner, such as when an abnormal stop such as unplugging the power outlet during operation is performed, positioning is performed in the next step S203. The positioning method is carried out by the same method as in the example of the motor current direction and the positional relationship between the stator and the rotor shown in FIG. Thereafter, in the next step S204, a start instruction waiting state is entered, and when a start instruction is input, normal operation is started.

  Thus, in the vacuum cleaner in this embodiment, when the vacuum cleaner is stopped and after the power is input. By positioning the fanless brushless DC motor before the start command for the fan motor is input, the start is promptly and reliably performed after the start instruction is input, and the usability is high and the reliability is high. A vacuum cleaner is realized.

  As described above, the present invention relates to a vacuum cleaner composed of a motor and a fan motor having a drive circuit for controlling the number of rotations thereof, and requires a highly reliable operation with a short start-up feeling. It is useful for various vacuum cleaners.

DESCRIPTION OF SYMBOLS 20 AC power supply 21 Drive circuit 22 Fan motor 23 Rectifier circuit 24 Smoothing capacitor 25a-30a Switching element 25b-30b Reflux diode 31 Control means 32 Positioning memory means

Claims (9)

A fan motor comprising a fan and a brushless DC motor for driving the fan;
An inverter circuit having a function of driving the fan motor;
A vacuum cleaner comprising: control means for controlling the inverter circuit and having a function of positioning a brushless DC motor of the fan motor when the fan motor is stopped. A fan motor comprising a fan and a brushless DC motor for driving the fan;
An inverter circuit having a function of driving the fan motor;
Control means for controlling the inverter circuit and having a function of positioning the brushless DC motor of the fan motor between the time when power is input to the inverter circuit and the time when the fan motor start command is input; The vacuum cleaner characterized by comprising. The control means includes positioning storage means for storing that the positioning of the brushless DC motor of the fan motor has been performed. When no positioning execution memory is set in the positioning storage means, power is input to the inverter circuit. The electric vacuum cleaner according to claim 1, wherein the electric vacuum cleaner has a function of positioning the brushless DC motor of the fan motor from when the fan motor start command is input. The vacuum cleaner according to claim 1 or 2, wherein the control means performs positioning by supplying a direct current from the inverter circuit to the brushless DC motor. The said control means implements positioning by supplying a direct current with another pattern, after supplying a direct current with a predetermined pattern from the said inverter circuit to the said brushless DC motor. The vacuum cleaner of any one of. A fan motor comprising a fan and a brushless DC motor for driving the fan;
An inverter circuit having a function of driving the fan motor;
A vacuum cleaner comprising: control means for controlling the inverter circuit and having a function of braking and decelerating the brushless DC motor of the fan motor after a stop command is input. The vacuum cleaner according to claim 6, wherein the control unit performs a deceleration by outputting a direct current from the inverter circuit to a brushless DC motor of the fan motor. The vacuum cleaner according to claim 6, wherein the control unit performs deceleration by outputting an AC current having a phase that does not generate regenerative power from the inverter circuit to the brushless DC motor of the fan motor. The vacuum cleaner according to any one of claims 6 to 8, wherein the control unit has a function of positioning the brushless DC motor after decelerating the fan motor.