CA1278334C - Device for the controllable operation of out-of-balance drives with three-phase motors - Google Patents
Device for the controllable operation of out-of-balance drives with three-phase motorsInfo
- Publication number
- CA1278334C CA1278334C CA000465862A CA465862A CA1278334C CA 1278334 C CA1278334 C CA 1278334C CA 000465862 A CA000465862 A CA 000465862A CA 465862 A CA465862 A CA 465862A CA 1278334 C CA1278334 C CA 1278334C
- Authority
- CA
- Canada
- Prior art keywords
- stage
- switching
- braking
- time
- interlock
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G27/00—Jigging conveyors
- B65G27/10—Applications of devices for generating or transmitting jigging movements
- B65G27/32—Applications of devices for generating or transmitting jigging movements with means for controlling direction, frequency or amplitude of vibration or shaking movement
-
- 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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/06—Controlling the motor in four quadrants
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Control Of Multiple Motors (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
ABSTRACT
Disclosed is an arrangement for controllable adjustment of rotational speed as well as braking of unbalance drives with three-phase motors by cycled switching, on and off, of a current supply by means of electronic switching gear. A central signal splitter and interlock stage is provided, which is supplied with synchronising pulses from a main power supply and which acts on the electronic switching gear through oscillator stages. The switching stage is connected on its input side with a start-stop switching and interlock unit, a runup-time stage, a controllable multivibrator and a braking phase angle control stage that is controlled by means of a time stage. Two phases of the current supply are by-passed by electronic switches during braking.
Disclosed is an arrangement for controllable adjustment of rotational speed as well as braking of unbalance drives with three-phase motors by cycled switching, on and off, of a current supply by means of electronic switching gear. A central signal splitter and interlock stage is provided, which is supplied with synchronising pulses from a main power supply and which acts on the electronic switching gear through oscillator stages. The switching stage is connected on its input side with a start-stop switching and interlock unit, a runup-time stage, a controllable multivibrator and a braking phase angle control stage that is controlled by means of a time stage. Two phases of the current supply are by-passed by electronic switches during braking.
Description
3~
23g30-275 The present invention relates to a device for the controllable operation, especially for speed adjustment as well as braking, of unbalance drives with three-phase motors hy the pulsed switching, on and off, of the current supply by means of electronic switching.
In addition to vibrating magnets, if the demand for precision is not too high, and for reasons of price, unbalance generators driven by electric motors can be used to drive vibration conveyors such as vibrating channels. If necessary, the unbalance generator and electric motor can be integrated into one constructional unit.
It is an object of the present invention to provide the advantages of vibrating magnets, with regard to precision of adjustment and holding accuracy, as well as the shortening of runout time for motor-driven unbalance drive systems.
According to a broad aspect of the invention there is provided an arrangement for controllable adjustment of rota~ional speed as well as braking of unbalance drives with three~phase motors by cycled switching, on and off, of a current supply by means of electronic swikching gear, characterized in that a central signal splitter and interlock stage is provided, said stage being suppIied with synchronising pulses from a main power supply and which acts on the electronic switching gear through oscillator stages, and which switching stage is connected on its input side with a start~stop awitching and interlock unlt, a runup-time stage, a controllable multivibrator and a braking phase ~.~
r;;;~
' .
8;~
angle control stage that is controlled by means of a time s~age and controls the electronic switching gear for half-wave operation and in that two phases of the current supply are connected via a contac~or and a free-wheeling diode during braking.
A process for the control of rotational speed of AC
motors by the repeated switching on and off of the current supply by electronic switching ~. ~
..~
, lX~78~
is already familiar from DE OS 30 04 456. In this process the arithmetic mean of the rotor angular velocity is determined by measurement o the time for the rotation of the motor rotor through a specific angle and compared with a given time value. If the measured time interval is given below the given time value, the current supply is switched off. If, at a later time measurement, the measured time interval is above the given time, the current supply to the motor is restored. In contrast to the invention, the known process deals with a speed control. If such a speed control is used in unbalance direct drives, the change in speed above the potentiometer position remains con-stant, regardless of the load imposed by the material to be conveyed. However, the coupling also changes with the load imposed by the material to be conveyed and with it the vibrating width. However, this is not detected. A dis-advantage with this solution is, among other things, the fact that devices such as proximity sensors must be installed to record the speed. These may be easily damaged by falling material. Furthermore, an additional control voltage is necessary. Since the device is matched to the desired number of poles of the motor, the operation of a motor with a different pole system with this control is, in contrast to the invention,no longer easily possible.
German P 28 55 330.2 discloses a method which can also switch on or ~ off and brake asynchronous motors. In contrast thereto, this invention still cov-ers the cycles of motors in order ~o achieve an average rotational speed. In addition, the brake current and the braking time can be adjusted in this invention.
The construction and operation of the device according to the invention is explained on the basis of the attached drawing.
The running time and the switched off time of an unbalance motor 8 is predetermined by an astable multivibrator 1 in which the running times ~LX7833~
23930-~75 and the switched of~ times are adjusted through a function generator 3 from an external voltage. The unbalance motor 8 may be an unbalance generator driven by an asynchronous motor.
However, a structural combination of unbalance generator and motor is also possible. The multivibrator 1 controls the switching on and off of the oscillators 5 at the end of the run-up (acceleration) time of the unbalance motor 8. The running times and the switched off times of the oscillators 5 are formed through two separate non-linear characteristic curves from a common control voltage applied to the function generator 3 and which can move, for example, between 0 and 10 V. The characteristic curve has a characteristic which minimizes the current path of the unbalance motor 8 and linearizes the conveyor current to the control signal.
The output signal of the multivibrator 1 is guided over a signal distribution and interlock stage 4 to two oscillators 5.
The interlock stage 4 carries out as follows a logic operation of t~le binary signals occurring at its inputs. It only releases the slgnal produced by the multivibrator 1 to the oscillators 5 when a ~0 start slgnal appears at one of its inputs and a synchronizing pulse appears over a line 6 at a ~urther input. The line 5 is connected with a sync signal output to a power supply 14 fed by a mains supply.
The start signal, produced by a lætart" key, is gulded over a start-stop-interlock circuit 10 which blocks the start signal if ~he "stop" key is not at the same time closed. If there 7833~
i~ no stop signal, i.e. the "stop" key is closed, the oper~ting contactor Kl is to begin with switched on by actuating the "start"
key. It connects the voltage Ll-L3 to ~he . ~
- ~ 3a - ' :` :
:
7~
unbalance motor 8. The start signal thereafter releases the signal distribution and interlock stage 4 and a run-up time stage 7 which suppresses for an adjustable length of time the switched off time in order to achieve an acceleration of the mbalance motor 8. At the end of the run-up time the multivibrator 1 takes over switching the oscillators 5 on and off. With the next sync signal on the line 6 the oscillators 5 transmit over an ~nplifier stage peaking pulses of approximately 5 kHz which act on the triacs 9 or antiparallel connected thyristors which are connected before the phase windings of the unbalance motor 8. Two triacs 9 or antiparallel connected thyristors are used for switching on and off.
The stop signal is given over the start-stop-interlock circuit 10 and an adjustable time stage 11 for the braking time to a contactor K2 for switching on a free-wheeling diode 13.
The time stage 11 for the braking time is connected to the inter-lock stage 4 via a phase angle circuit arrangement 12 for the brake current.
The contactor K2 and the free-wheeling diode 13 are connected to two phases of the unbalance motor 8.
The adjustable time stage 11 for the braking time is started through the phase disconnection 12. A triac or thyristor for half-wave operation is triggered through the phase disconnection circuit 12. The size of the braking direct current can be adjusted via the phase angle.
During the braking time the start key is locked. In addition, the brake current can only be switched on if the start key is actuated beforehand.
At the end of the braking time the contactors Kl and K2 drop out. The drive motors 8 are thereby idle until the next start process.
23g30-275 The present invention relates to a device for the controllable operation, especially for speed adjustment as well as braking, of unbalance drives with three-phase motors hy the pulsed switching, on and off, of the current supply by means of electronic switching.
In addition to vibrating magnets, if the demand for precision is not too high, and for reasons of price, unbalance generators driven by electric motors can be used to drive vibration conveyors such as vibrating channels. If necessary, the unbalance generator and electric motor can be integrated into one constructional unit.
It is an object of the present invention to provide the advantages of vibrating magnets, with regard to precision of adjustment and holding accuracy, as well as the shortening of runout time for motor-driven unbalance drive systems.
According to a broad aspect of the invention there is provided an arrangement for controllable adjustment of rota~ional speed as well as braking of unbalance drives with three~phase motors by cycled switching, on and off, of a current supply by means of electronic swikching gear, characterized in that a central signal splitter and interlock stage is provided, said stage being suppIied with synchronising pulses from a main power supply and which acts on the electronic switching gear through oscillator stages, and which switching stage is connected on its input side with a start~stop awitching and interlock unlt, a runup-time stage, a controllable multivibrator and a braking phase ~.~
r;;;~
' .
8;~
angle control stage that is controlled by means of a time s~age and controls the electronic switching gear for half-wave operation and in that two phases of the current supply are connected via a contac~or and a free-wheeling diode during braking.
A process for the control of rotational speed of AC
motors by the repeated switching on and off of the current supply by electronic switching ~. ~
..~
, lX~78~
is already familiar from DE OS 30 04 456. In this process the arithmetic mean of the rotor angular velocity is determined by measurement o the time for the rotation of the motor rotor through a specific angle and compared with a given time value. If the measured time interval is given below the given time value, the current supply is switched off. If, at a later time measurement, the measured time interval is above the given time, the current supply to the motor is restored. In contrast to the invention, the known process deals with a speed control. If such a speed control is used in unbalance direct drives, the change in speed above the potentiometer position remains con-stant, regardless of the load imposed by the material to be conveyed. However, the coupling also changes with the load imposed by the material to be conveyed and with it the vibrating width. However, this is not detected. A dis-advantage with this solution is, among other things, the fact that devices such as proximity sensors must be installed to record the speed. These may be easily damaged by falling material. Furthermore, an additional control voltage is necessary. Since the device is matched to the desired number of poles of the motor, the operation of a motor with a different pole system with this control is, in contrast to the invention,no longer easily possible.
German P 28 55 330.2 discloses a method which can also switch on or ~ off and brake asynchronous motors. In contrast thereto, this invention still cov-ers the cycles of motors in order ~o achieve an average rotational speed. In addition, the brake current and the braking time can be adjusted in this invention.
The construction and operation of the device according to the invention is explained on the basis of the attached drawing.
The running time and the switched off time of an unbalance motor 8 is predetermined by an astable multivibrator 1 in which the running times ~LX7833~
23930-~75 and the switched of~ times are adjusted through a function generator 3 from an external voltage. The unbalance motor 8 may be an unbalance generator driven by an asynchronous motor.
However, a structural combination of unbalance generator and motor is also possible. The multivibrator 1 controls the switching on and off of the oscillators 5 at the end of the run-up (acceleration) time of the unbalance motor 8. The running times and the switched off times of the oscillators 5 are formed through two separate non-linear characteristic curves from a common control voltage applied to the function generator 3 and which can move, for example, between 0 and 10 V. The characteristic curve has a characteristic which minimizes the current path of the unbalance motor 8 and linearizes the conveyor current to the control signal.
The output signal of the multivibrator 1 is guided over a signal distribution and interlock stage 4 to two oscillators 5.
The interlock stage 4 carries out as follows a logic operation of t~le binary signals occurring at its inputs. It only releases the slgnal produced by the multivibrator 1 to the oscillators 5 when a ~0 start slgnal appears at one of its inputs and a synchronizing pulse appears over a line 6 at a ~urther input. The line 5 is connected with a sync signal output to a power supply 14 fed by a mains supply.
The start signal, produced by a lætart" key, is gulded over a start-stop-interlock circuit 10 which blocks the start signal if ~he "stop" key is not at the same time closed. If there 7833~
i~ no stop signal, i.e. the "stop" key is closed, the oper~ting contactor Kl is to begin with switched on by actuating the "start"
key. It connects the voltage Ll-L3 to ~he . ~
- ~ 3a - ' :` :
:
7~
unbalance motor 8. The start signal thereafter releases the signal distribution and interlock stage 4 and a run-up time stage 7 which suppresses for an adjustable length of time the switched off time in order to achieve an acceleration of the mbalance motor 8. At the end of the run-up time the multivibrator 1 takes over switching the oscillators 5 on and off. With the next sync signal on the line 6 the oscillators 5 transmit over an ~nplifier stage peaking pulses of approximately 5 kHz which act on the triacs 9 or antiparallel connected thyristors which are connected before the phase windings of the unbalance motor 8. Two triacs 9 or antiparallel connected thyristors are used for switching on and off.
The stop signal is given over the start-stop-interlock circuit 10 and an adjustable time stage 11 for the braking time to a contactor K2 for switching on a free-wheeling diode 13.
The time stage 11 for the braking time is connected to the inter-lock stage 4 via a phase angle circuit arrangement 12 for the brake current.
The contactor K2 and the free-wheeling diode 13 are connected to two phases of the unbalance motor 8.
The adjustable time stage 11 for the braking time is started through the phase disconnection 12. A triac or thyristor for half-wave operation is triggered through the phase disconnection circuit 12. The size of the braking direct current can be adjusted via the phase angle.
During the braking time the start key is locked. In addition, the brake current can only be switched on if the start key is actuated beforehand.
At the end of the braking time the contactors Kl and K2 drop out. The drive motors 8 are thereby idle until the next start process.
Claims (2)
1. An arrangement for controllable adjustment of rotational speed as well as braking of unbalance drives with three-phase motors by cycled switching, on and off, of a current supply by means of electronic switching gear, characterized in that a central signal splitter and interlock stage is provided, said stage being supplied with synchronising pulses from a main power supply and which acts on the electronic switching gear through oscillator stages, and which switching stage is connected on its input side with a start-stop switching and interlock unit, a runup-time stage, a controllable multivibrator and a braking phase angle control stage that is controlled by means of a time stage and controls the electronic switching gear for half-wave operation and in that two phases of the current supply are connected via a contactor and a free-wheeling diode during braking.
2. A device according to claim 1, characterized in that a start key in said start-stop switching and interlock unit is locked out during braking.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3338148.8 | 1983-10-20 | ||
| DE19833338148 DE3338148A1 (en) | 1983-10-20 | 1983-10-20 | Device for the controllable operation of unbalanced drives with three-phase motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1278334C true CA1278334C (en) | 1990-12-27 |
Family
ID=6212334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000465862A Expired - Fee Related CA1278334C (en) | 1983-10-20 | 1984-10-19 | Device for the controllable operation of out-of-balance drives with three-phase motors |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1278334C (en) |
| DE (1) | DE3338148A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588175A (en) * | 2017-08-15 | 2018-01-16 | 河海大学 | Differential planet gear parallel connection four-quadrant motor high-power energy saving governing system and method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3533802A1 (en) * | 1985-09-21 | 1987-03-26 | Omikron Industrieelektronik | Circuit arrangement for controlling the starting and braking of three-phase asynchronous motors and method for operating such a circuit arrangement |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2855330A1 (en) * | 1978-12-21 | 1980-07-10 | Licentia Gmbh | Control circuit for three=phase asynchronous motor - stops, starts and brakes motor using only two pairs of antiparallel thyristors |
| DE3034276C2 (en) * | 1980-09-11 | 1987-03-19 | Siemens AG, 1000 Berlin und 8000 München | Asynchronous machine |
| DE3214518C2 (en) * | 1982-04-20 | 1986-07-17 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Method and control for setting the speed of an unbalance direct drive with an AC motor |
-
1983
- 1983-10-20 DE DE19833338148 patent/DE3338148A1/en not_active Ceased
-
1984
- 1984-10-19 CA CA000465862A patent/CA1278334C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588175A (en) * | 2017-08-15 | 2018-01-16 | 河海大学 | Differential planet gear parallel connection four-quadrant motor high-power energy saving governing system and method |
| CN107588175B (en) * | 2017-08-15 | 2019-07-23 | 河海大学 | Differential planet gear parallel connection four-quadrant motor high-power energy saving speed-regulating system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3338148A1 (en) | 1985-05-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |