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17:
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resistance value the higher the braking energy dissipation inside the motor. Typically, in low power motors(below 5 kW) the resistance value of the motor is relatively large in respect to the nominal current of the motor. The higher the power or the voltage of the motor the less the resistance value of the motor in respect to motor current. In other words, flux braking is most effective in a low power motor.
203:
In flux braking the increased current means increased losses inside the motor. The braking power is therefore also increased although the braking power delivered to the frequency converter is not increased. The increased current generates increased losses in motor resistances. The higher the
199:
typically used in drives. In the DC injection method DC current is injected to the motor so that control of the motor flux is lost during braking. The flux braking method based on DTC enables the motor to shift quickly from braking to motoring power when requested.
194:
is directly controlled to achieve the desired torque and flux for the motor. During flux braking the motor is under DTC control which guarantees that braking can be made according to the specified speed ramp. This is very different from the
79:
where the braking energy is converted to heat. Braking choppers are automatically activated when the actual DC bus voltage exceeds a specified level depending on the nominal voltage of the
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losses, for handling an overrunning load. When braking in the drive system is needed, the motor flux and thus also the magnetizing
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The ambient air includes substantial amounts of dust or other potentially combustible, explosive or metallic components
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Increased risk of fire due to hot resistor and possible dust and chemical components in the ambient air space
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when the load feeds energy back to the intermediate circuit. This arises, for example, when a magnetized
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The increased DC bus voltage level during braking causes additional voltage stress on motor insulation
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The chopper works even if AC supply is lost. Braking during main power loss may be required. E.g. in
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component used in the motor are increased. The control of flux can be easily achieved through the
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1/10 minutes, long braking times require more accurate dimensioning of the braking chopper
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R. Krishnan, 2001 "Electric Motor Drives: Modeling, Analysis, and
Control", Prentice Hall
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feeding power to the DC voltage intermediate circuit. They are an application of the
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The instantaneous braking power is high, e.g. several hundred kW for several minutes
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The total amount of braking energy is high in respect to the motoring energy needed
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The amount of braking energy with respect to motoring energy is extremely small
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Braking choppers are typically dimensioned for a certain cycle, e.g. 100%
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May require extra investments in the cooling and heat recovery system
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Werner
Leonhard, 2001 "Control of Electrical Drives" Springer Press
62:
15:
71:
A braking chopper is an magnetical switch that limits the DC bus
175:
251:
111:
The braking energy is wasted if the heated air can not be used
47:
is being rotated by an overhauling load and so functions as a
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The braking chopper and resistors require additional space
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Simple electrical construction and well-known technology
526:
Dual-rotor permanent magnet induction motor (DRPMIM)
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688:
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Low fundamental investment for chopper and resistor
166:Braking operation is needed during main power loss
55:, using the on-off control of a switching device.
157:The braking is continuous or regularly repeated
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143:The braking cycle is needed only occasionally
8:
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256:
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139:Braking choppers are inappropriate when:
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153:Braking choppers are appropriate when:
101:or other safety related applications.
75:by switching the braking energy to a
7:
178:braking is another method, based on
67:Large braking chopper installation
14:
919:Electric power systems components
27:, sometimes also referred to as
655:Timeline of the electric motor
1:
929:Mechanical power transmission
440:Dahlander pole changing motor
484:Brushless DC electric motor
955:
501:Switched reluctance (SRM)
479:Brushed DC electric motor
285:
35:intermediate circuits of
939:Electrical power control
934:Mechanical power control
689:Experimental, futuristic
606:Variable-frequency drive
190:principle. With DTC the
81:variable-frequency drive
706:Superconducting machine
344:Coil winding technology
68:
21:
747:Power-to-weight ratio
611:Direct torque control
188:direct torque control
66:
31:, are used in the DC
19:
742:Open-loop controller
635:Ward Leonard control
359:DC injection braking
197:DC injection braking
37:frequency converters
645:History, education,
291:Alternating current
808:Dolivo-Dobrovolsky
767:Voltage controller
722:Blocked-rotor test
660:Ball bearing motor
630:Motor soft starter
584:AC-to-AC converter
445:Wound-rotor (WRIM)
407:Electric generator
69:
22:
901:
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737:Open-circuit test
576:Motor controllers
457:Synchronous motor
279:Electric machines
53:chopper principle
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752:Two-phase system
732:Electromagnetism
680:Mouse mill motor
647:recreational use
521:Permanent magnet
450:Linear induction
303:Permanent magnet
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214:Motor controller
25:Braking choppers
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675:Mendocino motor
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430:Induction motor
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334:Braking chopper
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20:Braking chopper
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727:Circle diagram
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715:Related topics
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665:Barlow's wheel
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319:Components and
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297:Direct current
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551:Piezoelectric
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546:Electrostatic
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29:Braking units
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18:
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237:
228:
202:
174:
171:Flux braking
152:
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135:Applications
70:
28:
24:
23:
670:Lynch motor
435:Shaded-pole
321:accessories
39:to control
908:Categories
566:Axial flux
556:Ultrasonic
531:Servomotor
511:Doubly fed
506:Reluctance
402:Alternator
394:Generators
364:Field coil
349:Commutator
309:commutated
307:SC - Self-
220:References
883:Steinmetz
798:Davenport
596:Amplidyne
496:Universal
474:Homopolar
462:Repulsion
374:Slip ring
106:Drawbacks
59:Operation
49:generator
924:Choppers
888:Sturgeon
818:Ferraris
803:Davidson
625:Metadyne
541:Traction
489:Unipolar
469:DC motor
425:AC motor
329:Armature
208:See also
192:inverter
99:elevator
86:Benefits
77:resistor
878:Sprague
873:Siemens
848:Maxwell
813:Faraday
762:Starter
701:Railgun
696:Coilgun
536:Stepper
384:Winding
184:current
73:voltage
41:voltage
33:voltage
868:Saxton
853:Ørsted
838:Jedlik
833:Jacobi
823:Gramme
788:Barlow
776:People
601:Drives
516:Linear
417:Motors
379:Stator
893:Tesla
863:Pixii
828:Henry
793:Botto
783:Arago
369:Rotor
339:Brush
301:PM -
295:DC -
289:AC -
180:motor
122:power
45:motor
858:Park
843:Lenz
561:TEFC
176:Flux
910::
271:e
264:t
257:v
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