US3764822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for driving the drum of a washing machine
Assignee: US Philips Corp
•
Filing: 1972-06-29
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Granted: 1973-10-09
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Expires: 1992-06-29
Abstract
Abstract Arrangement including a self-commutating electric motor for driving the drum of a washing machine. The electric heating element of the washing machine is connected in the supply circuit in series with the motor. This supply circuit further contains a first rectifier which is connected in series with the motor and becomes conducting at the passages through zero of the supply voltage. Speed control of the motor is effected by means of a second rectifier which is of a bidirectional type and which shunts the series combination of the motor and the first rectifier and is set to the conductive condition by means of control pulses. The power dissipated by the heating element may also be regulated by means of this second rectifier.
Inventors
- 👤 W Ebbinge
- 👤 Ruiter C De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:55
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/295; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/923; Y10S388/934
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
A control circuit for a self-commutating electric motor comprising, a pair of input terminals adapted for connection to a source of supply voltage, an electric heating element, a first rectifier, means connecting the heating element, the motor and the first rectifier in a series circuit across said input terminals, a bidirectional controlled rectifier connected across the series combination of the motor and the first rectifier and in series with the heating element across the input terminals, and first means for selectively applying a first control signal to the control electrode of said bidirectional rectifier to control the conduction period thereof in a manner to regulate the motor current and thereby control the motor speed.
Claim 2
Dependent Claim
114 words
A control circuit for a self-commutating electric motor comprising, a pair of input terminals adapted for connection to a source of supply voltage, an electric heating element, a first rectifier, means connecting the heating element, the motor and the first rectifier in a series circuit across said input terminals, a bidirectional controlled rectifier connected across the series combination of the motor and the first rectifier and in series with the heating element across the input terminals, and first means for selectively applying a first control signal to the control electrode of said bidirectional rectifier to control the conduction period thereof in a manner to regulate the motor current and thereby control the motor speed.
Claim 3
Dependent Claim
43 words
A control circuit as claimed in claim 1 wherein the first rectifier comprises a bidirectional controlled rectifier having a control electrode connected to a control device for selectively supplying control signals to said control electrode to control the conduction of said first rectifier.
Claim 4
Dependent Claim
17 words
A control circuit as claimed in claim 1, characterized in that the first rectifier comprises a diode.
Claim 5
Dependent Claim
57 words
A control circuit as claimed in claim 3 further comprising, a second diode connected to the motor with opposite polarity to that of the first diode, and a switching element having first and second positions for selectively connecting said first and second diodes, respectively, in series with the motor and the heating element across said input terminals.
Claim 6
Dependent Claim
108 words
A control circuit as claimed in claim 1 wherein said supply voltage is an AC voltage and said first rectifier comprises a controlled rectifier having a control electrode for initiating conduction therein, second means for applying a second control signal to the control electrode of said first rectifier at the time the supply voltage across the first rectifier is approximately zero voltage, said first control signal applying means being arranged to supply said first control signal to the control electrode of the bidirectional rectifier during the half cycle of the supply voltage following said second control signal and at an instant of time which determines the motor speed.
Claim 7
Dependent Claim
44 words
A control circuit as claimed in claim 5 wherein said first control signal applying means includes means for selectively applying a third control signal to the control electrode of the bidirectional rectifier at the start of the next half cycle of the supply voltage.
Claim 8
Dependent Claim
57 words
A control circuit as claimed in claim 5 wherein said first controlled rectifier comprises a second bidirectional rectifier and said second control signal applying means is arranged to selectively apply said second control signal at the positive or negative going zero voltage crossover of the supply voltage thereby to control the direction of rotation of the motor.
Claim 9
Dependent Claim
64 words
A control circuit as claimed in claim 7 wherein said first control signal applying means includes means for selectively applying a third control signal to the control electrode of the first bidirectional rectifier during alternate half cycles of the AC supply voltage that follow the half cycles during which the first control signal is applied to the control electrode of the first bidirectional rectifier.
Claim 10
Dependent Claim
65 words
A control circuit as claimed in claim 1 wherein said supply voltage is an AC voltage and said first rectifier comprises a controlled rectifier having a control electrode for initiating conduction therein, and second means for applying a second control signal to the control electrode of said first rectifier whereby the motor speed is controlled jointly by said first controlled rectifier and said bidirectional rectifier.
Claim 11
Dependent Claim
17 words
A control circuit as claimed in claim 9 wherein said first controlled rectifier comprises a bidirectional rectifier.
References Cited (Backward Citations)
US3638090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |