JP2001238487A - Control unit for permanent magnet field type dc motor, and electric cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control unit for a permanent magnet field type DC motor at a low cost which is high in efficiency. SOLUTION: This control unit is equipped with the permanent magnet field type DC motor, a rectifying mean which supplies a power source, in which an AC power source is rectified by a full-wave rectifier circuit to the DC motor, a bilateral switch connected with the AC input side of the rectifier circuit, and control means for controlling the power source supplied to the motor, by controlling the bilateral switch. The DC motor is provided with field magnets which are fixed facing each other inside a stator core, a rotor where an armature winding is wound between slots inside the field magnets, a commutator connected with the armature winding, and brushes which supply power, while coming into contact with the commutator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC motor using a permanent magnet on the field side.

[0002]

2. Description of the Related Art FIG. 6 shows, for example,
FIG. 6 is a diagram showing a power control circuit of a conventional permanent magnet field type DC motor disclosed in Japanese Patent No. 6343. In FIG. 6, 1
Is an AC power supply, 2 is a bidirectional thyristor, 3 is a diode bridge which is a full-wave rectifier circuit, 6 is a smoothing capacitor for smoothing the voltage which has been full-wave rectified by the diode bridge 3, and 4 is a permanent magnet field type DC. It is an electric motor.

Next, the operation will be described. A power source in which the phase of the AC power source 1 is controlled by the bidirectional thyristor 2 is subjected to full-wave rectification by the diode bridge 3, and further, the voltage obtained by full-wave rectification by the smoothing capacitor 6 is smoothed to generate a DC power source. It is supplied to the permanent magnet type DC motor 4. By controlling the phase, the average voltage of the DC power supply supplied to the permanent magnet type DC motor 4 can be changed to control the rotation speed of the permanent magnet type DC motor 4.

Conventional example 2. FIG.
It is a figure which shows the electric power control apparatus of the conventional rechargeable cleaner described in 10493 gazette. In FIG. 7, 11 is a rechargeable battery, 12 is a switching element, and 4 is a permanent magnet type DC motor.

Next, the operation will be described. The switching operation of the DC voltage of the rechargeable battery 11 is performed by the switching element 12, and the voltage applied to the permanent magnet type DC motor 4 is controlled to change the rotation speed.

[0006]

Since the power control circuit of the conventional permanent magnet type DC motor is configured as described above, there are the following problems. (1) Since the conventional power control circuit uses the smoothing capacitor 6 to generate a DC power supply, there is a problem that the circuit becomes large and the power control circuit becomes expensive. (2) In the conventional power control device for a rechargeable vacuum cleaner, the rechargeable battery 1
In the case of performing control for increasing the suction force or performing long-time cleaning, the capacity of the rechargeable battery 11 needs to be increased, but a large rechargeable battery 11 is required.
There were problems such as an increase in cost.

[0007]

A control device for a permanent magnet field type DC motor according to the present invention includes a field magnet fixed inside a stator core to face each other, and a field magnet fixed inside the field magnet. A permanent magnet field type DC motor having a rotor having an armature winding between slots, a commutator connected to the armature winding, and a brush for supplying power while contacting the commutator, Controls the rectifier that supplies the power obtained by rectifying the AC power with the full-wave rectifier circuit to the permanent magnet field type DC motor, the bidirectional switch connected to the AC input side of the full-wave rectifier circuit, and the bidirectional switch Control means for controlling the power supplied to the permanent magnet field type DC motor by doing
It is provided with.

Further, a field magnet fixed inside the stator core so as to face each other, a rotor having an armature winding provided between slots inside the field magnet, and a rotor connected to the armature winding. Permanent magnet field type DC motor having a commutator and a brush for supplying electric power while contacting the commutator, and a power source obtained by rectifying AC power by a full-wave rectifier circuit is supplied to the permanent magnet field type DC motor. Rectifier means, switch means connected in series with the permanent magnet field type DC motor, and control means for controlling the power supplied to the permanent magnet field type DC motor by controlling the switch means. It is a thing.

A field magnet fixed to the inside of the stator core so as to face each other, a rotor having an armature winding between slots inside the field magnet, and a rotor connected to the armature winding Permanent magnet field type DC motor having a commutator and a brush for supplying electric power while contacting the commutator, and a power source obtained by rectifying an AC power supply with a voltage doubler rectifier circuit is supplied to the permanent magnet field type DC motor. Rectifier means, switch means connected in series with the permanent magnet field type DC motor, and control means for controlling the power supplied to the permanent magnet field type DC motor by controlling the switch means. It is a thing.

Further, a film capacitor is provided between terminals of a permanent magnet field type DC motor.

Further, a diode is provided between terminals of a permanent magnet field type DC motor.

[0012] An electric vacuum cleaner according to the present invention includes the control device for a permanent magnet field type DC motor according to any one of claims 1 to 5.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 and 2 show the first embodiment. FIG. 1 is a configuration diagram of a control device for a permanent magnet field type DC motor, and FIG. 2 is a cross-sectional view of the permanent magnet field type DC motor. In the figure, 1 is an AC power supply, 2 is a bidirectional thyristor, 13 is control means for controlling the phase of the bidirectional thyristor 2, 3 is a diode bridge which is a full-wave rectifier circuit, and 4 is a permanent magnet type DC motor. . FIG. 1 shows a configuration in which the smoothing capacitor 6 in the power control circuit (FIG. 6) of the conventional permanent magnet field type DC motor is not required.

In FIG. 2, reference numeral 21 denotes a stator core,
Reference numerals 22 and 23 denote permanent magnets, and reference numeral 24 denotes a rotor provided with armature windings.

Next, the operation will be described. Control means 1
The phase control of the AC power supply 1 is performed by the bidirectional thyristor 2 using the bidirectional thyristor 3, and the power supply whose phase is controlled is full-wave rectified by the diode bridge 3 to generate the power supply. The permanent magnet type DC motor 4 is driven by directly supplying the power generated by full-wave rectification. Even if the smoothing is not performed after full-wave rectification using the smoothing capacitor 6 as in the related art, since the positive and negative directions of the power supply do not change, the permanent magnet type DC motor 4 can be driven.

When controlling the rotation speed of the permanent magnet type DC motor 4, the control means 13 controls the phase of the bidirectional thyristor 2 to change the voltage value of the power supply generated by full-wave rectification. Can be realized by

As described above, even in the control device that does not use the smoothing capacitor 6, the permanent magnet type DC motor 4 can be driven, so that the cost for the smoothing capacitor can be reduced and an inexpensive control device can be obtained. Can be.

Further, since the permanent magnet type DC motor 4 has no winding on the stator, the motor can be easily disassembled even when the motor is discarded, and the effect of improving recyclability is obtained.

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows the second embodiment and is a configuration diagram of a control device for a permanent magnet field type DC motor. A film capacitor 5 is added to the control device in FIG. 1 according to the first embodiment. The configuration is the same as that of FIG. 1 except that a film capacitor 5 is added.

Since the permanent magnet type DC motor 4 mechanically switches the current flowing through the armature winding with a brush, a large surge voltage is generated between the terminals of the permanent magnet type DC motor 4 when the current is switched. There is a possibility that the diode bridge 3 may be destroyed by the surge voltage.

In the present embodiment, the film capacitor 5 is provided between the terminals of the permanent magnet type DC motor 4 to absorb the surge voltage between the terminals of the permanent magnet type DC motor 4 and prevent the control device from being destroyed. It is.

Since it is impossible to absorb a surge voltage generated between the terminals of the permanent magnet type DC motor 4 with an expensive smoothing capacitor 6 having a large capacitance, for example, about 2000 μF, as shown in the prior art, In this embodiment, an inexpensive film capacitor 5 having a small capacitance, for example, about 0.1 μF, is used.

By adding the film capacitor 5 as described above, a surge voltage generated between the terminals of the permanent magnet type DC motor 4 can be absorbed. Can be obtained. Further, since the film capacitor 5 having a small capacity is used, a relatively inexpensive control device can be obtained.

Embodiment 3 FIG. Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows the third embodiment, and is a configuration diagram of a control device of a permanent magnet field type DC motor. In FIG. 4, the same or corresponding parts as those in FIG. 1 described in Embodiment 1 are denoted by the same reference numerals, and description thereof will be omitted. 7 is a MOS-FET which is switch means for controlling the power supplied to the permanent magnet type DC motor 4;
Control means for controlling the switching of the S-FET 7, and 8 is a diode.

Next, the operation will be described. The AC power supply 1 is full-wave rectified by the diode bridge 3 to generate a power supply for driving the permanent magnet type DC motor 4. MOS-F whose drive power source is connected in series with permanent magnet type DC motor 4
By switching the ET 7 at a frequency higher than the power supply frequency of the AC power supply 1 by the control means 14, the power supply is controlled to control the rotation speed of the permanent magnet type DC motor 4.

Since the permanent magnet type DC motor 4 is an inductive load, the current continues to flow even when the MOS-FET 7 is turned off. However, a diode 8 is added between the terminals of the permanent magnet type DC motor 4. As a result, it is possible to keep the current flowing through the motor, and a circuit such as a MOS-F
Destruction of ET7 can be prevented.

As described above, by using the MOS-FET 7 to perform switching at a frequency higher than the power supply frequency, the current flowing through the permanent magnet type DC motor 4 becomes smooth and the motor loss can be reduced. An efficient permanent magnet field type DC motor control device can be obtained.

Although the MOS-FET 7 has been described here, the same effect can be obtained by using another switching element, for example, a transistor or an IGBT.

Embodiment 4 Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 5 shows the fourth embodiment, and is a configuration diagram of a control device for a permanent magnet field type DC motor. In the figure, the same or corresponding parts as those in FIG. 3 described in Embodiment 3 are denoted by the same reference numerals, and description thereof will be omitted.
Reference numerals 9 and 10 denote electrolytic capacitors for rectifying the AC power supply 1 by double voltage.

Next, the operation will be described. An AC power supply 1 is connected to a diode bridge 3 and two electrolytic capacitors 9 and 10.
To generate a power supply for driving the permanent magnet type DC motor 4. A MOS-FET 7 having a drive power supply connected in series with the permanent magnet type DC motor 4
By switching at a frequency higher than the power supply frequency of the AC power supply 1 using the AC power supply 4, the power supply is controlled to control the rotation speed of the permanent magnet type DC motor 4.

By performing the voltage doubler rectification, the power supply for driving the permanent magnet type DC motor 4 becomes about twice the power supply for full-wave rectification. Assuming the same motor input as full wave rectification, doubling the voltage will halve the motor current. When the current is reduced by half, the loss in the armature winding of the rotor 24 of the permanent magnet type DC motor 4 is reduced, and a highly reliable control device that suppresses heat generation of the motor can be obtained. Further, since the loss in the MOS-FET 7 is reduced, a highly efficient control device can be obtained.

By performing the voltage doubler rectification in this manner,
The motor current can be reduced, and a highly reliable and highly efficient permanent magnet field type DC motor control device that suppresses heat generation can be obtained.

When the present control device is mounted on a vacuum cleaner, a high-efficiency control device for the blower motor can be obtained, so that the work efficiency of the vacuum cleaner is increased, and a high-performance vacuum cleaner with high suction power is obtained. Can be obtained.

Further, since the motor current is reduced, the life of the brush used for the motor is extended, and a highly durable vacuum cleaner can be obtained.

Further, since a power source obtained by full-wave rectification of an AC power source instead of a rechargeable battery is used as a driving power source, a vacuum cleaner having a high suction force can be obtained.

Here, an example in which the diode bridge 3 is used for voltage doubler rectification has been described, but the same effect can be obtained by using a single diode.

[0037]

According to the present invention, there is provided a control apparatus for a permanent magnet field type DC motor, comprising: a field magnet fixed inside a stator iron core so as to face each other; A permanent magnet field type DC motor having a rotor having a rotor winding, a commutator connected to the armature winding, and a brush for supplying power while contacting the commutator, and an AC power supply. Means for supplying the power rectified by the wave rectifier circuit to the permanent magnet field type DC motor, a bidirectional switch connected to the AC input side of the full wave rectifier circuit, and a permanent switch by controlling the bidirectional switch. By providing control means for controlling the power supplied to the magnet field type DC motor, an inexpensive control device can be obtained.

Further, a field magnet fixed to the inside of the stator core so as to face each other, a rotor having an armature winding between slots inside the field magnet, and a rotor connected to the armature winding Permanent magnet field type DC motor having a commutator and a brush for supplying electric power while being in contact with the commutator, and a power source obtained by rectifying AC power with a full-wave rectifier circuit is supplied to the permanent magnet field type DC motor. Rectifier means, switch means connected in series with the permanent magnet field type DC motor, and control means for controlling the power supplied to the permanent magnet field type DC motor by controlling the switch means. As a result, a highly efficient permanent magnet field type DC motor control device can be obtained.

A field magnet fixed to the inside of the stator core so as to face each other, a rotor having an armature winding between slots inside the field magnet, and a rotor connected to the armature winding Permanent magnet field type DC motor having a commutator and a brush for supplying electric power while contacting the commutator, and a power source obtained by rectifying an AC power supply with a voltage doubler rectifier circuit is supplied to the permanent magnet field type DC motor. Rectifier means, switch means connected in series with the permanent magnet field type DC motor, and control means for controlling the power supplied to the permanent magnet field type DC motor by controlling the switch means. As a result, a highly reliable control device that suppresses heat generation of the electric motor can be obtained.

Further, by providing the film capacitor between the terminals of the permanent magnet field type DC motor, an inexpensive and highly reliable control device can be obtained.

Further, by providing the diode between the terminals of the permanent magnet field type DC motor, the destruction of the control device can be prevented.

A vacuum cleaner according to the present invention is provided with the control device for a permanent magnet field type DC motor according to any one of claims 1 to 5, so that it has a high attraction force and high durability. You can get a high vacuum cleaner.

[Brief description of the drawings]

FIG. 1 shows the first embodiment, and is a configuration diagram of a control device of a permanent magnet field type DC motor.

FIG. 2 shows the first to fourth embodiments, and is a cross-sectional view of a permanent magnet field type DC motor.

FIG. 3 is a view showing a second embodiment, and is a configuration diagram of a control device of a permanent magnet field type DC motor.

FIG. 4 is a view showing a third embodiment, and is a configuration diagram of a control device of a permanent magnet field type DC motor.

FIG. 5 shows the fourth embodiment and is a configuration diagram of a control device for a permanent magnet field type DC motor.

FIG. 6 is a configuration diagram of a conventional power control circuit.

FIG. 7 is a configuration diagram of a conventional power control device for a rechargeable vacuum cleaner.

[Explanation of symbols]

1 AC power supply, 2 bidirectional thyristor, 3 diode bridge, 4 permanent magnet field type DC motor, 5 film capacitor, 7 MOS-FET, 8 diode, 9,10 electrolytic capacitor, 11 rechargeable battery, 12
Switching element, 13, 14 control means, 21 stator core, 22, 23 permanent magnet, 24 rotor.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hitoshi Kawaguchi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Yuji Takahashi 1728-1 Komaeda, Hanazono-cho, Osato-gun, Saitama Mitsubishi F-term (reference) in Electric Home Equipment Co., Ltd. 3B057 DC02 5H571 AA20 BB02 BB05 BB07 CC05 DD01 HA09 HA11 HA16 HB01 HD03 JJ26 MM03

Claims (6)

[Claims] 1. A field magnet fixed inside a stator core so as to face each other, a rotor having an armature winding between slots inside the field magnet, and A permanent magnet field type DC motor having a connected commutator and a brush for supplying electric power while being in contact with the commutator; and a permanent magnet field type DC motor which rectifies an AC power supply with a full-wave rectifier circuit. Rectifying means for supplying to the electric motor; a bidirectional switch connected to the AC input side of the full-wave rectifier circuit; and a power supply supplied to the permanent magnet field type DC motor by controlling the bidirectional switch. A control device for a permanent magnet field type DC motor, comprising: control means for performing the control of (1). 2. A field magnet fixed to the inside of a stator core so as to face each other, a rotor having an armature winding between slots inside the field magnet, and A permanent magnet field type DC motor having a connected commutator and a brush for supplying electric power while being in contact with the commutator; and a permanent magnet field type DC motor for converting a power source obtained by rectifying an AC power supply with a full-wave rectifier circuit. Rectifying means for supplying power to the permanent magnet field type DC motor, and switch means connected in series with the permanent magnet field type DC motor; and controlling the power supplied to the permanent magnet field type DC motor by controlling the switch means. Means for controlling a permanent magnet field type DC motor. 3. A field magnet fixed inside the stator core so as to face each other, a rotor having an armature winding between slots inside the field magnet, and A permanent magnet field type DC motor having a connected commutator and a brush for supplying electric power while being in contact with the commutator; and a permanent magnet field type DC motor for converting a power source obtained by rectifying an AC power supply with a voltage doubler rectifier circuit. Rectifying means for supplying power to the permanent magnet field type DC motor, and switch means connected in series with the permanent magnet field type DC motor; and controlling the power supplied to the permanent magnet field type DC motor by controlling the switch means. Means for controlling a permanent magnet field type DC motor. 4. The control device for a permanent magnet field type DC motor according to claim 1, wherein a film capacitor is provided between terminals of the permanent magnet field type DC motor. . 5. The control device for a permanent magnet field type DC motor according to claim 2, wherein a diode is provided between terminals of the permanent magnet field type DC motor. 6. A vacuum cleaner comprising the control device for a permanent magnet field type DC motor according to claim 1. Description: