US5099184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical series motor with dynamic braking circuit
Assignee: Robert Bosch GmbH
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Filing: 1989-11-09
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Granted: 1992-03-24
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Expires: 2009-11-09
Abstract
Abstract To provide sufficient magnetization to the field of a series motor when the series motor is to be operated in dynamic braking mode, with a dissipating resistor or short circuit element (4) connected across the armature (5), a circuit connection is established between one of the main terminals of the motor through the series field to supply a minimum magnetization current, at least when the motor operates under dynamic braking conditions, typically a few to up to 15% of no-load current of the motor. This is sufficient magnetization so that, even in larger motors where remanent magnetism of the field structure is insufficient, reliable dynamic braking can be ensured. A switch (S; S 1 , S 2 ) selectively connects the motor armature for motor drive or running operation and dynamic braking operation. The magnetization current supply can be through a capacitor, resistor, or resistor-capacitor combination, which can be permanently connected across the power supply (10, 11) of the motor, or connected in circuit only when the switch (S, S 2 ) changes the motor into dynamic braking operation.
Inventors
- 👤 Friedrich Hornung
- 👤 Arnim Fiebig
- 👤 Manfred Kirn
- 👤 Gunter Schaal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:18
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
249 words
Series dynamoelectric machine adapted for connection to an energy supply (10, 11) in combination with a dynamic braking circuit, and operable in either of (a) motor mode of operation; (b) dynamic braking mode of operation; said dynamoelectric machine having an armature (5); a main field winding (1,2; 21, 22); a braking current energy dissipating means (4) for dissipating braking current energy when the machine is in dynamic braking mode of operation; and switching means (S) connected to said armature (5) for (a) when the dynamoelectric machine is in motor mode of operation, coupling said armature to said energy supply through said main field winding in a first direction of polarization of said field winding, and (b) when the dynamoelectric machine is in dynamic braking mode of operation, coupling the armature to said dissipating means and to at least part of the main field winding in a second direction of polarization, reversed with respect to said first direction of polarization, and severing connection of the energy supply of the armature through at least a portion of the main field winding; and circuit means (3, 3a) coupled to the energy supply (10, 11) of the dynamoelectric machine and to at least part of the main field winding for supplying a magnetizing current to said at least part of the main field wining independently of current flow through said at least part of the main field winding derived from the armature when said switching means is in dynamic braking mode of operation.
Claim 2
Dependent Claim
249 words
Series dynamoelectric machine adapted for connection to an energy supply (10, 11) in combination with a dynamic braking circuit, and operable in either of (a) motor mode of operation; (b) dynamic braking mode of operation; said dynamoelectric machine having an armature (5); a main field winding (1,2; 21, 22); a braking current energy dissipating means (4) for dissipating braking current energy when the machine is in dynamic braking mode of operation; and switching means (S) connected to said armature (5) for (a) when the dynamoelectric machine is in motor mode of operation, coupling said armature to said energy supply through said main field winding in a first direction of polarization of said field winding, and (b) when the dynamoelectric machine is in dynamic braking mode of operation, coupling the armature to said dissipating means and to at least part of the main field winding in a second direction of polarization, reversed with respect to said first direction of polarization, and severing connection of the energy supply of the armature through at least a portion of the main field winding; and circuit means (3, 3a) coupled to the energy supply (10, 11) of the dynamoelectric machine and to at least part of the main field winding for supplying a magnetizing current to said at least part of the main field wining independently of current flow through said at least part of the main field winding derived from the armature when said switching means is in dynamic braking mode of operation.
Claim 3
Dependent Claim
20 words
The combination of claim 1, wherein said circuit means (3, 3a) is permanently connected to said energy supply (10, 11).
Claim 4
Dependent Claim
65 words
The combination of claim 1, wherein said main field winding has two parts, said switching means connecting one part of the main field winding in said second direction of polarization when the dynamoelectric machine is in said dynamic braking mode of operation, and the other part of said field winding being permanently connected through said circuit means (3, 3a) across said energy supply (10, 11).
Claim 5
Dependent Claim
99 words
The combination of claim 1, wherein said circuit means (3, 3a) is connected across a switching terminal (S2) of said switching means, said switching terminal, when said switch is in the position for motor mode of operation of the dynamoelectric machine, short-circuiting said circuit means and, when said switch is placed in the position of dynamic braking mode of operation of the dynamoelectric machine, serially connecting said circuit means (3, 3a) with said main field winding (21, 22) said dissipating means (4) and across said energy supply (10, 11) to provide initial magnetization current for the main field winding.
Claim 6
Dependent Claim
24 words
The combination of claim 1 wherein said circuit means (3) coupled to the energy supply for supplying said magnetization current comprises a capacitor (3).
Claim 7
Dependent Claim
24 words
The combination of claim 1, wherein said circuit means (3a) coupled to the energy supply for supplying said magnetization current comprises a resistor (3a).
Claim 8
Dependent Claim
29 words
The combination of claim 1, wherein said circuit means coupled to the energy supply for supplying said magnetization current comprises a resistor (3a) in series with a capacitor (3).
Claim 9
Dependent Claim
61 words
The combination of claim 1, wherein the impedance of said circuit means (3, 3a) for supplying the magnetization current to at least part of the main field winding is dimensioned of such value that current will flow to said at least part of the main field winding of a value of up to 15% of the no-load current of the motor.
Claim 10
Dependent Claim
30 words
The combination of claim 1, wherein said dissipating means (4) comprises a dissipating resistor (4) dimensioned to limit the armature current, under dynamic braking mode, to a predetermined current value.
Claim 11
Dependent Claim
13 words
The combination of claim 9, wherein said dissipating resistor comprises a variable resistor.
Claim 12
Dependent Claim
62 words
The combination of claim 1, wherein the main field winding (1, 2) is a split field winding having two split parts (1, 2); and wherein said switching means is connected to only one (2) of said split parts for selective connection to the dissipating means, the other (1) of said split parts being connected to said circuit means supplying the magnetization current.
Claim 13
Dependent Claim
83 words
The combination of claim 1, wherein said dynamoelectric machine has said main field winding (21, 22) and a commutating or interpole winding (23, 24); wherein said switching means (S) is connected to said main field winding (21, 22) for reversely connecting said main field winding upon switch-over of the machine into dynamic braking mode of operation; and said switching means (S) further connects said circuit means supplying the magnetization current to the main field windings upon switch-over into dynamic braking mode of operation.
Claim 14
Dependent Claim
30 words
The combination of claim 12, wherein the main field winding is a two-part split field winding, and said magnetization current is connected to the parts of the split field winding.
Claim 15
Dependent Claim
24 words
The combination of claim 13, wherein the commutating winding comprises a plurality of commutating winding units (23, 24) for a plurality of commutating poles.
Claim 16
Dependent Claim
18 words
The combination of claim 1, wherein the dynamoelectric machine includes commutating poles and commutating pole windings (23, 24).
Claim 17
Dependent Claim
63 words
The combination of claim 1, wherein said switching means (S) is coupled to the circuit means (3, 3a) supplying the magnetization current, for supplying said magnetization current to the at least part of the main field winding only when said switching means connects the dissipating means in a closed circuit with the armature for operation of the dynamoelectric machine in dynamic braking mode.
References Cited (Backward Citations)
AT169981B
Cited
DE1114574B
Cited
AT210967B
Cited
US3899041A
Cited
US3983465A
Cited
US4087727A
Cited
US4096423A
Cited
DE2624236A1
Cited
US4352049A
Cited
US4471277A
Cited
US4812728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |