GB2050706A - Commutator motor - Google Patents
Commutator motor Download PDFInfo
- Publication number
- GB2050706A GB2050706A GB8010365A GB8010365A GB2050706A GB 2050706 A GB2050706 A GB 2050706A GB 8010365 A GB8010365 A GB 8010365A GB 8010365 A GB8010365 A GB 8010365A GB 2050706 A GB2050706 A GB 2050706A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil winding
- rotor
- commutator
- motor
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K27/00—AC commutator motors or generators having mechanical commutator
- H02K27/24—AC commutator motors or generators having mechanical commutator having two or more commutators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
- H02K23/26—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by the armature windings
- H02K23/36—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by the armature windings having two or more windings; having two or more commutators; having two or more stators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc Machiner (AREA)
- Windings For Motors And Generators (AREA)
Abstract
A commutator motor comprising a first commutator 9 and a second commutator 10 disposed on the rotary shaft 7 of a rotor 5, a first rotor coil winding 14 disposed on the rotors and having coil ends 14' connected to the first commutator 9, a second rotor coil winding 15 disposed on the rotor and having coil ends 15' connected to the second commutator 10, first and second stator coil windings 17 and 18 disposed on a stator 6, and a change- over switch 19 which can connect the first rotor coil winding 14 and the second rotor coil winding 1 5 in parallel with a power supply and connect the first stator coil winding 17 and the second stator coil winding 18 in parallel with the power supply when the commutator switch is used with a low voltage power supply, and can connect in series the first rotor coil winding 14, the second rotor coil winding 15, the first stator coil winding 17 and the second stator coil winding 18 when the commutator switch is used with a high voltage power supply, whereby the commutator motor may selectively be used either with a low voltage power supply or a high voltage power supply, by means of a switching operation of the change-over switch 19. <IMAGE>
Description
SPECIFICATION
Commutator motor
The present invention relates to a commutator motor.
A commutator motor has generally been used as a motor for an electric appliance such as a vacuum cleaner since such motor should be rotated at a high speed. Accordingly, when such electric appliance for example a vacuum cleaner is to be exported, it has been necessary to change the specifications of the commutator motor dependent on a 11 OV-low voltage power supply area or a 220V-high voltage power supply area to which such electric appliance is exported.
In a conventional motor to be selectively used with a low voltage power supply or a high voltage power supply, the rotor has one commutator and one rotor winding, and the stator has had two stator windings.
When such conventional commutator motor has been used at a low voltage power supply area, as shown in Figure 1(A), two stator windings 1 and 2 has been connected in parallel and such parallel circuit has been connected to a rotor winding 3 in series.
On the other hand, when such conventional commutator motor has been used at a high voltage power supply area, as shown in Fig. 1(B), two stator windings 1 and 2, a rotor winding 3 and a bilateral three-terminai thyrister 4 such as a
Triac have been connected in series.
The reason of why the thyrister 4 has been used is as follows:
When two stator windings 1 and 2 have been connected in series, input to the commutator motor from the high voltage power supply has been too large. Therefore, such input to the commutator motor has been controlled in phase by the thyrister 4, thereby to reduce such input to the commutator motor.
Furthermore, when such conventional commutator motor has been used with a low voltage power supply, the ratio of the ampereturns of two stator windings 1 and 2 to the ampere-turns of two rotor winding 3, i.e. the ampere-turns ratio, has become 1 or less and therefore good commutation has not been performed to emit sparks.
In order to overcome such defects abovementioned, it may be proposed to increase the number of turns of the stator windings 1 and 2 or to decrease the number of turns of the rotor winding 3. However, when the number of turns of the stator windings 1 and 2 are increased, input to the commutator motor from a low voltage power supply becomes too small. On the other hand, when the number of turns of the rotor winding 3 is decreased, input to the commutator motor from a high voltage power supply becomes too large. It is therefore not practical to increase to decrease the number of the winding turns.
In order to provide an ampere-turns ratio of 1 or more, the number of turns of the rotor winding 3 has generally been decreased, simultaneously with thickening the thickness of a rotor core, thereby to prevent input to the commutator motor from a high voltage power supply from becoming too large. In this connection, such conventional commutator motor to be selectively used with two different voltages has inevitably become large size. Moreover, since the thyrister 4 has been used therein, the input wave form has not become a sine wave, thus presenting a defect to aggravate the noise condition.
According to the present invention there is provided a commutator motor comprising a first commutator and a second commutator disposed on the rotary shaft of a rotor, a first rotor coil winding disposed on said rotor and having coil ends connected to said first commutator, a second rotor coil winding disposed on said rotor and having coil ends connected to said second commutator, a first stator coil winding and a second stator coil winding disposed on a stator, and a change-over switch which in one position connects said first rotor coil winding and said second rotor coil winding in parallel with a power supply and connects said first stator coil winding and said second stator coil winding in parallel with the power supply when said commutator motor is used with a low voltage power supply, and which in another position connects in series said first rotor coil winding, said second rotor coil winding, said first stator coil winding and said second stator coil winding when said commutator motor is used with a high voltage power supply.
The commutator motor of the present invention may selectively be used either with a low voltage power supply or a high voltage power supply by effecting a switching operation of the change-over switch.
Furthermore, according to the commutator motor of the present invention, the rotor core may be formed relatively thin which permits the commutator motor to be formed in a small size and light weight, and commutation with no sparks may be performed.
Some embodiments of the invention will now be described, by way of examples, with reference to the accompanying drawings, in which: Figure 1 is a circuit diagram of a conventional commutator motor, of which (A) illustrates a circuit when the commutator motor is used with a
low voltage power supply and (B) illustrates a circuit when the commutator motor is used with a high voltage power supply;
Figure 2 illustrates a first embodiment of a commutator motor in accordance with the present invention
Figures 3(A) and (B) are circuit diagrams of the commutator motor shown in Figure 2 when it is used with a low voltage power supply and a high voltage power supply, respectively;
Figure 4 illustrates a rotor used in the commutator motor shown in Figure 2, of which (A) illustrates a side view, (B) a left-hand end view and (C) a right-hand end view;;
Figure 5 illustrates another example of a rotor core used in the present invention, of which (A) is
a side view, (B) a left-hand end view and (C) a
right-hand end view;
Figure 6 illustrates a second embodiment of the
commutator motor in accordance with the present
invention;
Figures 7(A) and (B) are circuit diagrams of the
commutator motor shown in Figure 6 when it is
used with a low voltage power supply and a high
voltage power supply, respectively;
Figure 8 is a sectional view of an electric
blower to which the commutator motor of the
present invention is applied;
Figure 9 is a plan view of the electric blower
shown in Figure 8 with portions removed;
Figure 10 is a section, illustrating how a brush
holder in Figure 8 is inserted; and
Figure 11 is a plan view similar to Figure 9, but
illustrates a conventional electric blower with
portions removed.
The description will first be made in detail of a
first embodiment of a commutator motor in
accordance with the present invention, with
reference to Figs. 2 to 4.
The commutator motor of the present invention
comprises a rotor 5 and a stator 6. A rotor core 8
is mounted substantially at the centre portion of a
rotary shaft 7 of the rotor 5. A first commutator 9
and a second commutator 10 are mounted at the
both sides of the rotary shaft 7 with respect to the
rotor core 8.
A pair of first brushes 11 and a pair of second
brushes 12 are slidably contacted to the first
commutator 9 and the second commutator 10,
respectively. The rotary shaft 7 is supported at the
both ends thereof by bearings 13.
A first rotor coil winding 14 and a second rotor
coil winding 15 are wound in slots formed in the
rotor core 8. The first rotor coil winding 14 has coil
ends 14' connected to the first commutator 9. The
second rotor coil winding 15 has coil ends 15'
connected to the second commutator 10.
A first stator coil winding 17 and a second
stator coil winding 1 8 are shunt-wound in slots in
a stator core 1 6. A change-over switch 19 has a
first change-over piece 20 and a second change
over piece 21 interlocked with each other.
When the commutator motor is used with a low
voltage power supply, as shown by the solid lines
in Fig. 2, a first fixed terminal 22 is connected to a
first change-over terminal 23 by the first change
over piece 20, and a second fixed terminal 24 is
connected to a second change-over terminal 25
by the second change-over piece 21.
When the commutator motor is used with a
high voltage power supply, as shown by the
broken lines in Figure 2, the first fixed terminal 22
is connected to the second change-over terminal
25 by the first change-over piece 20 and the
second fixed terminal 24 is connected to a third
change-over terminal 26 by the second change
over piece 21.
The first fixed terminal 22 is connected to one
of the second brushes 12. The second fixed
terminal 24 is connected to one end of a power supply 27 and one end of the second stator coil winding 1 8. The first change-over terminal 23 is connected to the other end of the power supply 27 and one end of the first stator coil winding 17.
The second change-over terminal 25 is connected to one of the first brushes 1 The third changeover terminal 26 is an idle connection which is not electrically connected to any circuit.
The other end of the second stator coil winding 1 8 is connected to the other of the second brushes 12. The other end of the first stator coil winding 1 7 is connected to the other of the first brushes 11.
Accordingly, when the first change-over piece 20 and the second change-over piece 21 of the change-over switch 1 9 are connected as shown by the solid lines in Fig. 2, as shown in Fig. 3(A) the first rotor coil winding 14 and the first stator coil winding 1 7 are connected in series and the second rotor coil winding 1 5 and the second stator coil winding 1 8 are also connected in series, and such series circuits are connected in parallel.
This is a case where the commutator motor of the present invention is to be used at a low voltage power supply-area.
When the first change-over piece 20 and the second change-over piece 21 are switchingly connected as shown by the broken lines in Figure 2, as shown in Figure 3(B), the first rotor coil winding 14, the second rotor coil winding 1 5, the first stator coil winding 1 7 and the second stator coil winding 1 8 are all connected in series.
Accordingly, even if a voltage double the voltage applied at a low voltage power supply area is applied to the both ends of this series circuit, a voltage equal to that supplied from a low voltage power supply is applied to the respective coil windings 14, 15, 17 and 18. This is a case where the commutator motor of the present invention is to be used at a high voltage power supply area.
When the change-over switch 1 9 is switched either to the state shown by the solid lines or the state shown by the broken lines in Figure 2 with the power supply voltage maintained constant, the rotation speed of the motor may be varied, whereby the commutator motor of the present invention may be used as a two-speed motor.
The description hereinafter will discuss how to wind the first rotor coil winding 14 and the second rotor coil winding 15, with reference to Figure 4 illustrating only the rotor in Figure 2.
The first rotor coil winding 14 is wound at the
lower portions of the slots in the rotor core 8, and is connected at the coil ends 14' thereof to the respective segments of the first commutator 9.
Thereafter, the second rotor coil winding 1 5 is wound at the upper portions of the slots and is connected at the coil ends 1 5' thereof to the respective segments of the second commutator
10.
As discussed hereinbefore, since two rotor coil windings 14 and 1 5 are wound at the lower
portions and upper portions of the slots, respectively, the potential difference between adjacent portions (a) and (b) of the upper coil winding or the lower coil winding shown in Figure 4(C), becomes small, thereby to permit to improve a voltage-resisting property across the portions of the motor.
It is also possible to wind the first rotor coil winding 14 with a conventional coil-winding machine and thereafter wind the second rotor coil winding 15 with the rotor core 8 turned over.
Thus, a conventional coil-winding machine is advantageously used as it is, thereby to improve mass-production efficiency.
However, in such a case, large potential difference is generated between the upper second rotor coil winding 1 5 and the lower first rotor coil winding 14 and it is therefore desired to dispose insulating papers therebetween.
Here, it is necessary to be noted that, when the rotor wound as shown in Figure 4 is used with a low voltage power supply, output from the commutator motor is slightly lowered. Namely, output P from the commutator motor is represented by the following equation:
where i: magnetic flux generated by the first stator coil winding 17, 02: magnetic flux generated by the second stator coil winding 18, 11: a current flowed in the first rotor coil winding 14, and 12: a current flowed in the second rotor coil winding 1 5.
When considering the reactances of the first rotor coil winding 14 and the second rotor coil winding 15, the first rotor coil winding 14 wound in the lower portions of the slots of the rotor core 8 is larger in reactance than the second rotor coil winding 1 5 wound at the upper portions.
Accordingly, even if 9, and Ii are same in phase and 02 and 12 are also same in phase, 02 and Ii are different in phase and Q, and 12 are different in phase. Therefor, in such a case the vector products of 412 i1 and 41i 12 become smaller as cornpared with the case where 412 and 11 are same in phase and j1 and 12 are same in phase. As the result, output from the commutator motor is lowered as mentioned earlier.
The description hereinafter will discuss another way of how to wind the first rotor coil winding 14 and the second rotor coil winding 15, with reference to Figure 5.
It is to be noted that like parts are designated by like numerals used in Figure 4.
Two copper wires in parallel with each other are wound at the same time in each of the slots in a rotor core 8. The coil ends 14' of a first rotor coil winding 14 formed by one copper wire are connected to a first commutator 9. The coil ends
15' of a second rotor coil winding 1 5 formed by the other copper wire are connected to a second commutator 10.
According to this method, since two copper wires are simultaneously wound to form the first rotor coil winding 14 and the second rotor coil winding 15, the both coil windings 14 and 1 5 are substantially equal in reactance to each other.
Therefore, magnetic flux 02 generated by a second stator coil winding 1 8 is same in phase as a current 1, flowed in the first rotor coil winding 14, and magnetic flux 0, generated by a first stator coil winding 1 7 is same in phase as a current 12 flowed in the second rotor coil winding 1 5. Accordingly, even if such commutator motor is used with a low voltage power supply, output from the commutator motor may not be lowered but may efficiently be taken out at maximum.
Regarding adjacent portions (a) and (c) of two copper wires shown in Figure 5(C), these two portions (a) and (c) are apart from each other in view of electrical circuit as shown in Fig. 3(B) and there is large potential difference between these portions (a) and (c). Accordingly, when such portions (a) and (c) between which there is large potential difference are adjacent to each other, it may well be that a smallest pin hole causes a short circuit. It is therefore necessary to use care of a voltage-resisting property.
The description hereinafter will discuss in detail a second embodiment of the present invention with reference to Figures 6 and 7.
It is to be noted that like parts are designated by like numerals used in Figures 2 and 3.
This second embodiment is same as the first embodiment shown in Figure 2 in the structures of a rotor 5 and a stator 6, but different from the first embodiment in a change-over switch 28 and the connection thereof.
According to the second embodiment, the change-over switch 28 has a first change-over piece 29, a second change-over piece 30, a third change-over piece 31 and a fourth change-over piece 32.
When the commutator motor of this second embodiment is used with a low voltage power supply, as shown by the solid lines in Figure 6 a first fixed terminal 33 is connected to a first change-over terminal 34 by the first change-over piece 29, a second fixed terminal 35 is connected to a second change-over terminal 36 by the second change-over piece 30, a third fixed terminal 37 is connected to a third change-over terminal 38 by the third change-over piece 31, and a fourth fixed terminal 39 is connected to a fourth change-over terminal 40 by the fourth change-over piece 32.
On the other hand, when the commutator motor of the second embodiment is used with a high voltage power supply, as shown by the broken lines in Figure 6 the first fixed terminal 33 is connected to a fifth change-over terminal 41 by the first change-over piece 29, the second fixed terminal 35 is connected to the first change-over terminal 34 by the second change-over piece 30, the third fixed terminal 37 is connected to a sixth change-over terminal 42 by the third change-over piece 31, and the fourth fixed terminal 39 is connected to the third change-over terminal 38 by the fourth change-over piece 32.
The first fixed terminal 33 is connected to one end of a power supply 27 and one of second brushes 12. The second fixed terminal 35 is connected to the other of the second brushes 12.
The third fixed terminal 37 is connected to the other end of the power supply 27 and one end of a second stator coil winding 1 8. The fourth fixed terminal 39 is connected to the other end of a second stator coil winding 18. The first changeover terminal 34 is connected to one of first brushes 11. The second change-over terminal 36
is connected to one end of a first stator coil winding 17, the other of the first brushes 11 and the fourth change-over terminal 40. The third change-over terminal 38 is connected to the other end of the first stator coil winding 1 7. The fifth and sixth change-over terminals 41 and 42 are idle terminals which are connected to nowhere.
When the change-over pieces 29,30,31 and 32 of the change-over switch 28 are connected as shown by the solid lines in Figure 6, the first rotor coil winding 14 and the second rotor coil winding 1 5 are connected in parallel and the first stator
coil winding 17 and the second stator coil winding
18 are connected in parallel. These parallel circuits are then connected in series as shown in Figure
7(A). This is a case where the commutator motor of the second embodiment is used at a low voltage power supply area.
When the commutator motor of the second -embodiment is used at a high voltage power supply area, the change-over switch 28 is switched to the status shown by the broken lines in Figure 6. Then, the first rotor coil winding 14, the second rotor coil winding 15, the first stator coil winding 17 7 and the second stator coil winding 18 are all connected in series as shown in Figure 7(B). Accordingly, even though a voltage double a voltage supplied from a low voltage power supply
is applied to the both ends of this series circuit, a voltage equal to that supplied from a low voltage power supply is applied to the respective coil windings 14,15, 17 and 18.
The description hereinafter will discuss, by way
of example, an electric blower to which the
commutator motor of the present invention is
applied, with reference to Figures 8 to 10.
An electric blower 43 has a motor case 44
made of sheet metal acording to a drawing
method. A large-diameter end bracket 45 is
secured to the front opening end of this motor
case 44 by screws or the like.
The bearings 13 comprising ball bearings are fitted in the concaved portions respectively formed
at the center portions of the motor case rear end
and the end bracket 45. These bearings 13
support the rotary shaft 7 of the rotor 5. The rotary
shaft 7 has one end projecting outwardly from the
end bracket 45. A centrifugal fan 46 is fixed to the
projecting end of the rotary shaft 7.
An air-guide plate 47 is secured between the
centrifugal fan 46 and the end bracket 45. The
end bracket 45 has at the peripheral edge thereof
a projecting rim 48, which is overlapped on the
peripheral surface of the motor case 44 with a space provided therebetween. The opening of the fan case 49 is fitted into the rim 48. The fan case 49 has at the center portion thereof an air inlet 50.
Ventilating holes 51 and 52 communicating with the inside of the motor case 44 are formed in the end bracket 45 and the rear end of the motor case 44, respectively.
When the fan is rotated, air sucked from the air inlet 50 is forcibly pushed into the motor case 44 from the ventilating hole 51 after passing through the rear side of the guide plate 47, and then cools the-rotorS and the stator 6 before being discharged from the ventilating hole 52.
As mentioned earlier, a pair of the first brushes 11 are slidably contacted with the first commutator 9 disposed at the rear of the rotor 5, and a pair of the second brushes 12 are slidably contacted with the second commutator 10 disposed at the front of the rotor 5. As generally done in a conventional commutator motor, these brushes 11 and 12 are inserted into and held by brush holders 53 and 54 together with coil spring means serving also as conductor, the brush holders 53 and 54 being formed with metallic guide cylinders inserted into insulating bases. The motor case 44 has at the peripheral surface thereof bores 55 and 56 into which the brush holders 53 and 54 are inserted, respectively.
These bores 55 and 56 are located on a line at right angle to the rotary shaft of the rotor 5.
Accordingly, when such bores 55 and 56 are to be formed in the motor case 44, one punching operation may provide two bores at one time, thereby to improve working efficiency.
These bores 56 and 55 are formed adjacent the front and rear ends of the motor case 44, respectively. Accordingly, the rim 48 of the end bracket 45 covers, like eaves, the front bores 56, thereby to become a hindrance to the insertion of the brush holders 54.
In view of the above, according to the electric blower 43, notches 57 are formed in those portions of the rim 48 which overlap on the bores 56.
As shown in Figure 10, prior to the fitting of the fan case 49, the brush holders 54 are inserted into the corresponding bores 56 through the notches 57 and are then fixed to the motor case 44 by screws 58, thus completing the attachment of the second brushes 12.
The rear brush holders 53 are inserted into the bores 55 and are then fixed to the motor case 44 by screws 59, thus completing the attachment of the first brushes 11.
When the fan case 49 is fitted in the motor case 44 after the front brush holders 54 have been fixed, the notches 57 are hidden behind the fan case 49.
As thus discussed hereinbefore, since the notches 57 are formed in the rim 48, tapping a wooden hammer or the like on the portions of the fan case 49 corresponding to the notches 57 permits the fan case 49 to be readily removed, thereby to facilitate the disassembling or repair of the electric blower 43.
As shown in Figure 9, each of the notches 57 has a width W2 fairly larger than the width W1 of each of the brush holders 54, thereby to facilitate the insertion of the brush holders 54.
Figure 11 illustrates a conventional electric blower in which notches 57 in Figure 8 are not formed in a rim 48. In such an electric blower in
Figure 11, it is necessary to provide, apart from the width of the rim 48, a length L required for arranging the brush holders 54. On the contrary, according to the electric blower 43 shown in
Figures 8 to 10, the width Ii of the rim 48 is included in the length L shown in Figure 9, so that the longitudinal length of the blower may correspondingly be shortened.
Industrial Utility
The commutator motor in accordance with the present invention comprises a first commutator and a second commutator disposed at the rotary shaft of a rotor, a first rotor coil winding disposed at the rotor and having coil ends connected to the first commutator, a second rotor coil winding disposed on the rotor and having coil ends connected to the second commutator, a first stator coil windingr and a second stator coil winding disposed on a stator, and a change-over switch which can connect the first rotor coil winding and the second rotor coil winding in parallel with a power supply and also to connect the stator coil winding and the second stator coil winding in parallel with the power supply when the commutator motor is used with a low voltage power supply, and can connect in series the first rotor coil winding, the second rotor coil winding, the first stator coil winding and the second stator coil winding when the commutator motor is used with a high voltage power supply.
The change-over switch may permit not only the stator coil windings but also the rotor coil windings to be selectively connected either in parallel or in series whereby the commutator motor of the present invention may selactively be used with a low voltage power supply or a high voltage power supply while providing substantially equal output in either case without the use of a thyrister therein as conventionally done.
Furthermore, the thickness of the rotor core is not thick and commutation may still be performed with no-sparks. The use of such relatively thin rotor core permits the commutator motor to be formed in a small size and light weight.
Moreover, since the first rotor coil winding is wound at the lower portions of the slots formed in the rotor core and the second rotor coil winding is wound at the upper portions of the slots, potential difference between adjacent coils is small, so that a voltage-resisting property may not be decreased.
Further, since such coils may be wound with a usual winding machine, the commutator motor of the present invention may be mass-produced.
Furthermore, since two wires may simultaneously be wound in each of the slots in the rotor core to form two coil windings of which one is formed as a first rotor coil winding and the other is formed as a second rotor coil winding, both coil windings are substantially equal in reactance, so that maximum motor output may be taken out, thus providing an efficient commutator motor.
The commutator motor according to the present invention may be applied to an electric blower. In such a case a large-diameter end bracket is disposed at one end of the motor case and this bracket has at the peripheral edge thereof a rim to which a fan case is fitted. This rim is formed as overlapped on the motor case with a space provided therebetween. Notches are formed in two opposite portions of the rim. Bores are formed in those portions of one end to the motor case which correspond to the notches in the rim, and bores are also formed in the other end of the motor case. Then, brushes are inserted into the respective bores toward the respective commutators. With such arrangement, the attachment of the brush holders may be facilitated and even though the number of commutators is increased, it is not particularly required to extend the length of the motor case. Provision of the notches may advantageously facilitate the removal of the fan case.
Claims (9)
1. A commutator motor comprising a first commutator and a second commutator disposed on the rotary shaft of a rotor, a first rotor coil winding disposed on said rotor and having coil ends connected to said first commutator, a second rotor coil winding disposed on said rotor and having coil ends connected to said second commutator, a first stator coil winding and second rotor coil winding in parallel with a.
power supply and connects said first stator coil winding and said second stator coil winding in parallel with the power supply when said commutator motor is used with a low voltage power suply, and which in another position connects in series said first rotor coil winding, said second rotor coil winding, said first stator coil winding and said second stator coil winding when said commutator motor is used with a high voltage power supply.
2. A commutator motor as claimed in claim 1, wherein said commutator motor is used with a low voltage power supply, the change-over switch connects one of the rotor coil windings and one of the stator coil windings in series to form a series circuit, and connects the other of the rotor coil windings and the other of the stator coil windings in series to form a series circuit, and said two series circuits are connected in parallel.
3. A commutator motor as claimed in claim 1 or claim 2, wherein the first commutator is disposed at one side of the rotor core and the second commutator is disposed at the other side of said rotor core.
4. A commutator motor as claimed in any preceding claim, wherein the first rotor coil winding is wound at the lower portions of slots formed in the rotor core and the second rotor coil winding is wound at the upper portions of said slots.
5. A commutator motor as claimed in any of claims 1 to 3, wherein two wires are simultaneously wound in each slot of slots formed in the rotor core to form two coil windings, of which one is formed as a first rotor coil winding and the other is formed as a second rotor coil winding.
6. A commutator motor as claimed in any of claims 1, 3, 4 or 5, wherein, when said commutator motor is used with a low voltage power supply, the change-over switch connects the first rotor coil winding and the second rotor coil winding in parallel to form a parallel circuit, and connects the first stator coil winding and the second stator coil winding in parallel to form a parallel circuit, and said two parallel circuits are connected in series.
7. A commutator motor as claimed in any of claims 1, 2, 4, 5 or 6, wherein the first commutator and the second commutator are disposed at one side of the rotor core.
8. A commutator motor as claimed in any preceding claim, wherein a large-diameter end bracket is disposed at one side of a motor case and has at the periphery thereof a turned rim to which a fan case can be fitted, said rim being formed as overlapped on said motor case with a space provided therebetween, notches are formed in two opposite portions of said rim, bores are formed in two portions of one end of said motor case which correspond to said notches, two bores are formed in the other end of said motor case, and brushes are inserted into said bores toward the commutators.
9. A commutator motor substantially as hereinbefore described with reference to and as illustrated in Figures 2 to 4, Figure 5, Figures 6 and 7 and Figures 8 to 11.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7074579A JPS55162869A (en) | 1979-06-05 | 1979-06-05 | Commutator motor |
| JP7535579A JPS561760A (en) | 1979-06-14 | 1979-06-14 | Commutator motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2050706A true GB2050706A (en) | 1981-01-07 |
| GB2050706B GB2050706B (en) | 1984-01-25 |
Family
ID=26411878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8010365A Expired GB2050706B (en) | 1979-06-05 | 1980-03-27 | Commutator motor |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3012506C2 (en) |
| FR (1) | FR2458931A1 (en) |
| GB (1) | GB2050706B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2632791A1 (en) * | 1988-04-13 | 1989-12-15 | Bosch Gmbh Robert | DIRECT CURRENT MOTOR AT ONE OR MORE SPEEDS FOR DRIVING WINDSCREEN WIPER BLADES |
| US7348703B2 (en) * | 2004-08-20 | 2008-03-25 | Dumitru Bojiuc | Monopole field electric motor-generator with switchable coil configuration |
| WO2011016789A1 (en) * | 2009-08-03 | 2011-02-10 | Chernogorov Anatoliy Dmitrievich | Electric motor |
| CN106787574A (en) * | 2017-02-26 | 2017-05-31 | 深圳市汤普森科技有限公司 | A kind of rotor using double double independent windings of commutator single-chip group |
| EP2651018A3 (en) * | 2012-04-10 | 2017-08-30 | Hitachi Automotive Systems, Ltd. | DC commutator motor and automobile including the same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE172316C (en) * | ||||
| FR548819A (en) * | 1922-03-13 | 1923-01-26 | Special construction process for small dynamos, for multiple applications | |
| FR566986A (en) * | 1923-06-04 | 1924-02-23 | White Fuel Oil Engineering Cor | Current generator for electric arc welding |
| CH329880A (en) * | 1955-02-01 | 1958-05-15 | Siemens Ag Albis | DC drive unit |
| FR1344602A (en) * | 1962-11-29 | 1963-11-29 | Dual voltage electric motor | |
| CH443465A (en) * | 1966-04-04 | 1967-09-15 | Tobler Willy P Dipl Ing | DC machine |
| DE2855987A1 (en) * | 1978-12-23 | 1980-07-10 | Flux Geraete Gmbh | Dual speed LV DC motor - has two rotor windings and two collectors with single permanent-magnet field for both speeds |
| DE2904904A1 (en) * | 1979-02-09 | 1980-08-21 | Bosch Gmbh Robert | DC MOTOR |
-
1980
- 1980-03-27 GB GB8010365A patent/GB2050706B/en not_active Expired
- 1980-03-31 DE DE19803012506 patent/DE3012506C2/en not_active Expired
- 1980-04-03 FR FR8007566A patent/FR2458931A1/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2632791A1 (en) * | 1988-04-13 | 1989-12-15 | Bosch Gmbh Robert | DIRECT CURRENT MOTOR AT ONE OR MORE SPEEDS FOR DRIVING WINDSCREEN WIPER BLADES |
| US7348703B2 (en) * | 2004-08-20 | 2008-03-25 | Dumitru Bojiuc | Monopole field electric motor-generator with switchable coil configuration |
| WO2011016789A1 (en) * | 2009-08-03 | 2011-02-10 | Chernogorov Anatoliy Dmitrievich | Electric motor |
| EP2651018A3 (en) * | 2012-04-10 | 2017-08-30 | Hitachi Automotive Systems, Ltd. | DC commutator motor and automobile including the same |
| CN106787574A (en) * | 2017-02-26 | 2017-05-31 | 深圳市汤普森科技有限公司 | A kind of rotor using double double independent windings of commutator single-chip group |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2050706B (en) | 1984-01-25 |
| DE3012506A1 (en) | 1980-12-18 |
| DE3012506C2 (en) | 1987-01-29 |
| FR2458931B1 (en) | 1984-11-16 |
| FR2458931A1 (en) | 1981-01-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20000326 |