GB2072971A - System for operating a synchronous electric motor fed with an A.C. voltage - Google Patents

System for operating a synchronous electric motor fed with an A.C. voltage Download PDF

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Publication number
GB2072971A
GB2072971A GB8108847A GB8108847A GB2072971A GB 2072971 A GB2072971 A GB 2072971A GB 8108847 A GB8108847 A GB 8108847A GB 8108847 A GB8108847 A GB 8108847A GB 2072971 A GB2072971 A GB 2072971A
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GB
United Kingdom
Prior art keywords
voltage
capacitor
parallel
fuse
motor
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Granted
Application number
GB8108847A
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GB2072971B (en
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SATCHWELL BIRKA
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SATCHWELL BIRKA
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Publication date
Application filed by SATCHWELL BIRKA filed Critical SATCHWELL BIRKA
Publication of GB2072971A publication Critical patent/GB2072971A/en
Application granted granted Critical
Publication of GB2072971B publication Critical patent/GB2072971B/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P4/00—Arrangements specially adapted for regulating or controlling the speed or torque of electric motors that can be connected to two or more different electric power supplies
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1902—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value
    • G05D23/1905—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value associated with tele control

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Fuses (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The present invention relates to a system for operating a synchronous electric motor fed with a.c. by the application of voltages of different magnitude, particularly of 220 V and 24 V. It is an object to operate the circuit with these voltages without change. This is accomplished in that a capacitor (8) is connected in series with and a glow lamp (11) is connected in parallel to the motor (10). A fuse (9) is connected in parallel to the capacitor (8). The subject matter of the application can preferably be used in room thermostats provided with a timer. <IMAGE>

Description

SPECIFICATION System for operating a synchronous electric motor fed with an a.c. voltage This invention relates to a system for operating a synchronous electric motor fed with an a.c.
voltage.
See Deutsches Offenlegungsschrift to Satchwell-Birka Regelungstechnik GmbH 2838716 (6th March 1980). The synchronous motors used there are particularly used in clockcontrolled thermostats in heating system control devices. Operating voltages of 24 V a.c. and 220 V a.c. have been used more recently for such clock-controlled thermostats. These voltages are applied to the overwhelming majority of all clockwork motors.
The present invention is based on the above system and seeks to simplify and render less expensive the circuit arrangement shown there in such a manner that to the same motor 24 V and 220 V a.c. can be applied without any change in the circuit arrangement.
According to the present invention there is provided a system for operating a synchronous electric motor fed from an a.c. voltage by the application of voltages of different magnitude by means of a capacitor and a voltage-dependent resistor connected in parallel to the motor, characterized in that a fuse is connected in parallel with the capacitor and a glow lamp is used as a voltage-dependent resistor.
The technical progress which can be achieved with that circuit is seen in that the circuit operates in the normal manner when 24 V a.c. is applied to it and that the fuse responds to the application of 220 V a.c. and the circuit operates normally thereafter. As the system will be inoperative when a circuit arrangement previously connected to 220 V is connected to 24 V, the state of use can be ascertained from the fuse alone.
An illustrative embodiment of the invention will be explained more fully with reference to the figure of the drawing.
Supply leads 3 and 4 are connected to terminals 1 and 2 of a single-phase a.c. system and lead to two parallel circuits 5 and 6, which have a common junction 7.
The parallel circuit 5 consists of a capacitor 8 of about 33 nF and a fuse 9, which is connected in parallel and blows at about 1 A. The second parallel circuit 6 consists of a synchronous motor 10, which is designed for 24 V and at that voltage has a current input of about 2.5 mA. A glow lamp 11 is connected in parallel to the motor 10 and has a firing voltage of 60 to 70 V and no series resistor.
When 24 V a.c. are applied to terminals 1 and 2, the fuse will bridge the capacitor 8 when the current is less than 1 A so that the capacitor 8 will then be ineffective. As a result, unchanged 24 V are applied to junction 7 to feed the motor 10. The glow lamp 11 connected in parallel is ineffective because its firing voltage is not reached.
As soon as 220 V a.c. are applied to the circuit, that voltage will be applied also to junction 7 because the capacitor 8 will be short-circuited.
The firing voltage of the glow lamp is then exceeded so that the glow lamp is fired and reduces the voltage between junction 7 and lead 2 to the sustaining voltage of about 50 V.
As a result, the motor cannot be overloaded but the current flowing exceeds 1 A so that the fuse 9 blows. The capacitor 8 now acts as a series resistor so that the voltage drops below the sustaining voltage of the glow lamp and the latter goes out. The capacitor has such a resistance that 24 V are again applied to the motor.
A check whether or not the fuse 9 has blown will indicate whether 24 V or 220 V a.c. were applied to the system.
1. A system for operating a synchronous electric motor fed from an a.c. voltage by the application of voltages of different magnitude by means of a capacitor and a voltage-dependent resistor connected in parallel to the motor, characterized in that a fuse is connected in parallel with the capacitor and a glow lamp is used as a voltage-dependent resistor.
2. The system as claimed in claim 1, characterized in that the fuse has a response threshold of about one ampere (1 A).
3. A system constructed and arranged to operate substantially as hereinbefore described and as shown in the single figure of the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION System for operating a synchronous electric motor fed with an a.c. voltage This invention relates to a system for operating a synchronous electric motor fed with an a.c. voltage. See Deutsches Offenlegungsschrift to Satchwell-Birka Regelungstechnik GmbH 2838716 (6th March 1980). The synchronous motors used there are particularly used in clockcontrolled thermostats in heating system control devices. Operating voltages of 24 V a.c. and 220 V a.c. have been used more recently for such clock-controlled thermostats. These voltages are applied to the overwhelming majority of all clockwork motors. The present invention is based on the above system and seeks to simplify and render less expensive the circuit arrangement shown there in such a manner that to the same motor 24 V and 220 V a.c. can be applied without any change in the circuit arrangement. According to the present invention there is provided a system for operating a synchronous electric motor fed from an a.c. voltage by the application of voltages of different magnitude by means of a capacitor and a voltage-dependent resistor connected in parallel to the motor, characterized in that a fuse is connected in parallel with the capacitor and a glow lamp is used as a voltage-dependent resistor. The technical progress which can be achieved with that circuit is seen in that the circuit operates in the normal manner when 24 V a.c. is applied to it and that the fuse responds to the application of 220 V a.c. and the circuit operates normally thereafter. As the system will be inoperative when a circuit arrangement previously connected to 220 V is connected to 24 V, the state of use can be ascertained from the fuse alone. An illustrative embodiment of the invention will be explained more fully with reference to the figure of the drawing. Supply leads 3 and 4 are connected to terminals 1 and 2 of a single-phase a.c. system and lead to two parallel circuits 5 and 6, which have a common junction 7. The parallel circuit 5 consists of a capacitor 8 of about 33 nF and a fuse 9, which is connected in parallel and blows at about 1 A. The second parallel circuit 6 consists of a synchronous motor 10, which is designed for 24 V and at that voltage has a current input of about 2.5 mA. A glow lamp 11 is connected in parallel to the motor 10 and has a firing voltage of 60 to 70 V and no series resistor. When 24 V a.c. are applied to terminals 1 and 2, the fuse will bridge the capacitor 8 when the current is less than 1 A so that the capacitor 8 will then be ineffective. As a result, unchanged 24 V are applied to junction 7 to feed the motor 10. The glow lamp 11 connected in parallel is ineffective because its firing voltage is not reached. As soon as 220 V a.c. are applied to the circuit, that voltage will be applied also to junction 7 because the capacitor 8 will be short-circuited. The firing voltage of the glow lamp is then exceeded so that the glow lamp is fired and reduces the voltage between junction 7 and lead 2 to the sustaining voltage of about 50 V. As a result, the motor cannot be overloaded but the current flowing exceeds 1 A so that the fuse 9 blows. The capacitor 8 now acts as a series resistor so that the voltage drops below the sustaining voltage of the glow lamp and the latter goes out. The capacitor has such a resistance that 24 V are again applied to the motor. A check whether or not the fuse 9 has blown will indicate whether 24 V or 220 V a.c. were applied to the system. CLAIMS
1. A system for operating a synchronous electric motor fed from an a.c. voltage by the application of voltages of different magnitude by means of a capacitor and a voltage-dependent resistor connected in parallel to the motor, characterized in that a fuse is connected in parallel with the capacitor and a glow lamp is used as a voltage-dependent resistor.
2. The system as claimed in claim 1, characterized in that the fuse has a response threshold of about one ampere (1 A).
3. A system constructed and arranged to operate substantially as hereinbefore described and as shown in the single figure of the accompanying drawing.
GB8108847A 1980-03-20 1981-03-20 System for operating a synchronous electric motor fed with an ac voltage Expired GB2072971B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803010629 DE3010629C2 (en) 1980-03-20 1980-03-20 Arrangement for operating a synchronous motor fed with AC voltage

Publications (2)

Publication Number Publication Date
GB2072971A true GB2072971A (en) 1981-10-07
GB2072971B GB2072971B (en) 1983-09-21

Family

ID=6097723

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8108847A Expired GB2072971B (en) 1980-03-20 1981-03-20 System for operating a synchronous electric motor fed with an ac voltage

Country Status (6)

Country Link
AT (1) AT374986B (en)
CH (1) CH627593A5 (en)
DE (1) DE3010629C2 (en)
FR (1) FR2478898A1 (en)
GB (1) GB2072971B (en)
NL (1) NL8101287A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH655398B (en) * 1982-03-01 1986-04-15
ES2169660B1 (en) * 2000-04-18 2003-11-01 Bsh Balay Sa APPLIANCES, WITH A SYNCHRONOUS MOTOR.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH517408A (en) * 1970-11-09 1971-12-31 Woog Inst Rech Circuit arrangement for an electrical hand-held device that can be operated with alternating voltage, in particular a dry shaving apparatus, with a direct current motor fed via a rectifier
CH635221B (en) * 1978-09-02 Satchwell Birka ELECTRICAL CIRCUIT FOR OPERATING AN AC MOTOR.
DE2838716C3 (en) * 1978-09-02 1981-08-13 Satchwell Birka Regelungstechnik Gmbh, 5630 Remscheid Electrical circuit arrangement for operating an electric motor fed with alternating voltage

Also Published As

Publication number Publication date
DE3010629C2 (en) 1983-01-05
AT374986B (en) 1984-06-25
FR2478898A1 (en) 1981-09-25
GB2072971B (en) 1983-09-21
CH627593A5 (en) 1982-01-15
NL8101287A (en) 1981-10-16
ATA117781A (en) 1983-10-15
FR2478898B1 (en) 1984-06-08
DE3010629A1 (en) 1981-09-24

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee