CA1180575A - Vibration damping device for step-by-step controlled motors - Google Patents
Vibration damping device for step-by-step controlled motorsInfo
- Publication number
- CA1180575A CA1180575A CA000404387A CA404387A CA1180575A CA 1180575 A CA1180575 A CA 1180575A CA 000404387 A CA000404387 A CA 000404387A CA 404387 A CA404387 A CA 404387A CA 1180575 A CA1180575 A CA 1180575A
- Authority
- CA
- Canada
- Prior art keywords
- housing
- vibration damping
- motor
- inner ring
- shaft
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/16—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/22—Damping units
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Acoustics & Sound (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Rolling Contact Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Motor Or Generator Frames (AREA)
- Support Of The Bearing (AREA)
- Vibration Prevention Devices (AREA)
- Combined Devices Of Dampers And Springs (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A vibration damping member for a step-by-step controlled motor is of the type of a cage ball bearing whose inner ring is fixedly secured to the shaft of the motor. The bearing is disposed in a housing filled with vibration damping liquid such as oil or silicone. The outer ring of the bearing is freely rotatable. The advance in the art is in that the elements of the overall assembly are gradually synchronized on acceleration or deceleration, whereby energy consumption and wear is reduced.
A vibration damping member for a step-by-step controlled motor is of the type of a cage ball bearing whose inner ring is fixedly secured to the shaft of the motor. The bearing is disposed in a housing filled with vibration damping liquid such as oil or silicone. The outer ring of the bearing is freely rotatable. The advance in the art is in that the elements of the overall assembly are gradually synchronized on acceleration or deceleration, whereby energy consumption and wear is reduced.
Description
57~
The invention relates ~o a damping device for use in step-by-step controlled motors.
It is known that in the step-by-step controlled motors, mechanical and/or electrical vibrations of the type of pendulum motions may occur, which overlap at ~hP step-switching motions. Such vibrations can be of the frequency from 200 hz up to 2000 hz and can give rise to resonances which may result in that the motor falls out of step and has to be started again. Such abnormal state is simultaneously associated with high noises even though the rotor is at a standstill.
Damped vibration mo~ions are a:Lso encountered on braking of the motor. Such vibrations are disadvantageous particularly with machine tools which require exactly defined step-motions of the tool.
It is known to use anti-vibration devices for dampeniny such vibrations at the motor shaft. However, such devices require acceleration on the starting of the motor and must be decelerated on the braking of the motor. In order to brake the mass of the device, mechanical or electrical braking devices are required whose energy consumption and wear are of disadvantage.
It is an object of the invention to provide a vlbration dampening device whose inertia on the start of the motor is relatively small and which ls still capable to dampen mechanical and/or electrical vibrations occuxring within the region of the operational frequencies.
According to the invention, the device is of the type of a cage ball bearing or a roller bearing or the like, whose inner ring is ixedly secured to the shaft of the motor, the bearing being mounted in a housing containing a viscous damping liquid/ the outer xing of the bearing being freely rotatable.
~d~
1 1~3(~7S
The use of a preferred cage ball bearing in a housing filled with vibration dampening liquid has the advantage that on the starting of the motor, only the inner ring (which is fixedly secured to the motor shaft) and the ligh~, thin-walled housing has ~o be accelerated. The gradual synchronization of the outer ring takes place through the dampening liquid in the housing. On the occurrence of vihrations, the ou~Qr ring of the ball bearing is driven~ due to its inertia moment, at a speed different from that of the housing, of the balls, and of the inner ring. Thus, the viscosity of the damping liquid causes a damping of the vibration also due to the different velocities of the respective elements.
The invention will now be described in greater detail by way of preferred embodiment, with reference to Figs. 1 and 2. They show:
Fig. 1 - a cross section of the anti-vibration device, and Fig. 2 - a side view partly in section, showing only the housing.
The device consists of a ball bearing-like strwcture with an inner ring 11, arl outer ring 12 and balls 13 disposed therebetween, as well as of a housing 14, which consists of two housing halves 15 and 16, and which is filled with a vibration damping viscous liquid, for instance oil, or, preferably, sillcone. Each housing half has an inwardly protruding collar 18 which ls fixedly secured to the shaft of a step-by-step controlled motor. A spacing is provided between the outer ring 12 of the ball bearing-like member and the outer wall of the housing, as well as at the axial ends or bottoms 17 of the housing, so that the outer ring 12 of the bearing is freely rotatable~ Both housing halves 15 and 16 ~ ~3(i5'~
and their respective collar 18 are aEfixed to each other in a liquid tight fashion, for instance by an adhesive or by welding.
On the starting of step-by step controlled motor, at first only the inner ring 11 of the ball bearing fixedly secured to the collars 18 and thus to the shaft (not shown) of the motor, and also the housing halves 15,14 integral with the collars 18~ are the only parts that are rotated.
The synchronziation of the outer ring 12 follows gradually by the aid of the viscous liquid contained in the housing.
On vibration motions, the entire mass of the ball bearing-like portion inclusivP the housiny becomes effected. At the outset of acceleration or deceleration of the motor greater velocity differences occur in vibration generating motions affecting the damping liquid, thus increasing the effectiveness in reducing the vibration, while reducing the energy consumption in comparison with the known anti-vibration devicesof this typei Those skilled in the art will readily appreciate that the preferred embodiment shown in the drawing and described above can be modified to a grea~er or lesser degree without departing from the scope of the inventon as set forth in the accompanying claims.
The invention relates ~o a damping device for use in step-by-step controlled motors.
It is known that in the step-by-step controlled motors, mechanical and/or electrical vibrations of the type of pendulum motions may occur, which overlap at ~hP step-switching motions. Such vibrations can be of the frequency from 200 hz up to 2000 hz and can give rise to resonances which may result in that the motor falls out of step and has to be started again. Such abnormal state is simultaneously associated with high noises even though the rotor is at a standstill.
Damped vibration mo~ions are a:Lso encountered on braking of the motor. Such vibrations are disadvantageous particularly with machine tools which require exactly defined step-motions of the tool.
It is known to use anti-vibration devices for dampeniny such vibrations at the motor shaft. However, such devices require acceleration on the starting of the motor and must be decelerated on the braking of the motor. In order to brake the mass of the device, mechanical or electrical braking devices are required whose energy consumption and wear are of disadvantage.
It is an object of the invention to provide a vlbration dampening device whose inertia on the start of the motor is relatively small and which ls still capable to dampen mechanical and/or electrical vibrations occuxring within the region of the operational frequencies.
According to the invention, the device is of the type of a cage ball bearing or a roller bearing or the like, whose inner ring is ixedly secured to the shaft of the motor, the bearing being mounted in a housing containing a viscous damping liquid/ the outer xing of the bearing being freely rotatable.
~d~
1 1~3(~7S
The use of a preferred cage ball bearing in a housing filled with vibration dampening liquid has the advantage that on the starting of the motor, only the inner ring (which is fixedly secured to the motor shaft) and the ligh~, thin-walled housing has ~o be accelerated. The gradual synchronization of the outer ring takes place through the dampening liquid in the housing. On the occurrence of vihrations, the ou~Qr ring of the ball bearing is driven~ due to its inertia moment, at a speed different from that of the housing, of the balls, and of the inner ring. Thus, the viscosity of the damping liquid causes a damping of the vibration also due to the different velocities of the respective elements.
The invention will now be described in greater detail by way of preferred embodiment, with reference to Figs. 1 and 2. They show:
Fig. 1 - a cross section of the anti-vibration device, and Fig. 2 - a side view partly in section, showing only the housing.
The device consists of a ball bearing-like strwcture with an inner ring 11, arl outer ring 12 and balls 13 disposed therebetween, as well as of a housing 14, which consists of two housing halves 15 and 16, and which is filled with a vibration damping viscous liquid, for instance oil, or, preferably, sillcone. Each housing half has an inwardly protruding collar 18 which ls fixedly secured to the shaft of a step-by-step controlled motor. A spacing is provided between the outer ring 12 of the ball bearing-like member and the outer wall of the housing, as well as at the axial ends or bottoms 17 of the housing, so that the outer ring 12 of the bearing is freely rotatable~ Both housing halves 15 and 16 ~ ~3(i5'~
and their respective collar 18 are aEfixed to each other in a liquid tight fashion, for instance by an adhesive or by welding.
On the starting of step-by step controlled motor, at first only the inner ring 11 of the ball bearing fixedly secured to the collars 18 and thus to the shaft (not shown) of the motor, and also the housing halves 15,14 integral with the collars 18~ are the only parts that are rotated.
The synchronziation of the outer ring 12 follows gradually by the aid of the viscous liquid contained in the housing.
On vibration motions, the entire mass of the ball bearing-like portion inclusivP the housiny becomes effected. At the outset of acceleration or deceleration of the motor greater velocity differences occur in vibration generating motions affecting the damping liquid, thus increasing the effectiveness in reducing the vibration, while reducing the energy consumption in comparison with the known anti-vibration devicesof this typei Those skilled in the art will readily appreciate that the preferred embodiment shown in the drawing and described above can be modified to a grea~er or lesser degree without departing from the scope of the inventon as set forth in the accompanying claims.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A vibration damping device, particularly for use in step by-step controlled electric motors which is adapted to be mounted on a shaft of a motor or the like, the device being of the type including a cage ball bearing-like element having an inner ring adapted to be fixedly secured to said shaft, said element being arranged in a housing filled with a viscous liquid and including an outer ring is freely rotatable relative to said inner ring and said housing.
2. A device according to claim 1, wherein the housing consists of two halves sealingly connected with each other.
3. A device according to claims 1 or 2, wherein the housing is made of a plastic material.
4. A device according to claim 2, wherein the housing halves are each provided with an inwardly directed collar adapted to be fixedly secured to the respective shaft, the inner ring of the ball bearing-like element being fixedly secured to said collar.
5. A device according to one of claims 1, 2 or 4, wherein the viscous liquid is oil.
6. A device according to one of claims 1, 2 or 4, wherein the viscous liquid is silicone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3122288A DE3122288C2 (en) | 1981-06-04 | 1981-06-04 | Torsional vibration damper for stepper motors |
| DEP3122288.9-13 | 1981-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1180575A true CA1180575A (en) | 1985-01-08 |
Family
ID=6133952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000404387A Expired CA1180575A (en) | 1981-06-04 | 1982-06-03 | Vibration damping device for step-by-step controlled motors |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0066866B1 (en) |
| JP (1) | JPS58500886A (en) |
| CA (1) | CA1180575A (en) |
| DE (2) | DE3122288C2 (en) |
| WO (1) | WO1982004363A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5460017A (en) * | 1992-05-21 | 1995-10-24 | Eti Technologies Inc. | Weight compensating apparatus |
| US5592858A (en) * | 1992-05-21 | 1997-01-14 | Eti Technologies Inc. | Weight compensating method and apparatus |
| US5605078A (en) * | 1992-05-21 | 1997-02-25 | Eti Technologies Inc. | Weight compensating method and apparatus |
| US5613408A (en) * | 1992-05-21 | 1997-03-25 | Eti Technologies Inc. | Weight compensating method and apparatus |
| US5724862A (en) * | 1992-05-21 | 1998-03-10 | Eti Technologies Inc. | Dynamic balancing method and apparatus |
| US5845542A (en) * | 1992-05-21 | 1998-12-08 | Eti Technologies Inc. | Dynamic balancing method and apparatus |
| CN114017487A (en) * | 2021-11-10 | 2022-02-08 | 上海纳铁福传动系统有限公司 | Motor gear shaft system and motor |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4563605A (en) * | 1984-07-10 | 1986-01-07 | Gerber Scientific Inc. | Damping device for rotary stepping motor |
| US4825983A (en) * | 1987-03-14 | 1989-05-02 | Motoyasu Nakanishi | Inertia damper |
| US6535475B1 (en) | 1996-10-09 | 2003-03-18 | Samsung Electronics Co., Ltd. | Disk player, and turntable incorporating self-compensating dynamic balancer, clamper incorporating self-compensating dynamic balancer and spindle motor incorporating self-compensating dynamic balancer adopted for disk player |
| US6205110B1 (en) * | 1997-06-25 | 2001-03-20 | Nidec Corporation | Disk drive motor |
| RU2003101289A (en) * | 2003-01-20 | 2005-02-10 | Геннадий Георгиевич Маслов (RU) | METHOD FOR STRENGTHENING POWER ON THE MOTOR SHAFT |
| DE102008000686B4 (en) * | 2008-03-14 | 2013-08-22 | Phytron-Elektronik Gmbh | Rotary and axial vibration dampers for drives |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB637652A (en) * | 1946-01-30 | 1950-05-24 | Brandt Edgar Ets | Improved inertia device for regulating the rotation of shafts and like driven members |
| CH338519A (en) * | 1955-08-27 | 1959-05-31 | Ferranti Albino | Electric motor-flywheel unit for the control of an operating machine |
| US3121347A (en) * | 1961-01-19 | 1964-02-18 | Houdaiile Ind Inc | Viscous torsional vibration damper |
| US3286109A (en) * | 1964-02-17 | 1966-11-15 | Superior Electric Co | Step motor damped by a viscous fluid filling |
| NL6516685A (en) * | 1965-12-22 | 1967-06-23 | ||
| GB1217506A (en) * | 1967-12-12 | 1970-12-31 | Holset Engineering Co | Torsional vibration damper |
| US3547503A (en) * | 1968-06-11 | 1970-12-15 | Barden Corp | Dual step motor controlled low friction oscillating bearing arrangement for gyroscope rotor or the like |
| DD90254A1 (en) * | 1971-03-22 | 1972-05-20 | Viscosity-type torsional vibration damper | |
| DE2249648B2 (en) * | 1972-10-11 | 1976-11-11 | Binder Magnete Gmbh, 7730 Villingen | STEPPER MOTOR WITH VIBRATION DAMPING |
| US3937536A (en) * | 1973-11-09 | 1976-02-10 | Traut Earl W | Rolling contact bearing devices |
| DE2605765A1 (en) * | 1975-02-19 | 1976-09-09 | Honeywell Inc | CUSHIONING DEVICE FOR TWO COMPONENT ROTATING PARTS |
| AU504982B2 (en) * | 1975-06-18 | 1979-11-01 | Vdo Adolf Schindling Aktiengesellschaft | Damping device for a stepping motor |
| DE2527046C3 (en) * | 1975-06-18 | 1983-01-05 | Vdo Adolf Schindling Ag, 6000 Frankfurt | Damping device for a stepper motor |
| US4031420A (en) * | 1976-04-22 | 1977-06-21 | Carini Eugene P | Flywheel drive system |
| US4160390A (en) * | 1977-06-16 | 1979-07-10 | Spaetgens Theodore W | Tuned torsional vibration damper |
| US4164769A (en) * | 1978-04-24 | 1979-08-14 | Data General Corporation | Cross band coupling for stepper-motor-driven, rigid magnetic disc |
-
1981
- 1981-06-04 DE DE3122288A patent/DE3122288C2/en not_active Expired
-
1982
- 1982-06-03 CA CA000404387A patent/CA1180575A/en not_active Expired
- 1982-06-04 DE DE8282104927T patent/DE3267554D1/en not_active Expired
- 1982-06-04 WO PCT/EP1982/000118 patent/WO1982004363A1/en unknown
- 1982-06-04 EP EP82104927A patent/EP0066866B1/en not_active Expired
- 1982-06-04 JP JP57501966A patent/JPS58500886A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5460017A (en) * | 1992-05-21 | 1995-10-24 | Eti Technologies Inc. | Weight compensating apparatus |
| US5592858A (en) * | 1992-05-21 | 1997-01-14 | Eti Technologies Inc. | Weight compensating method and apparatus |
| US5605078A (en) * | 1992-05-21 | 1997-02-25 | Eti Technologies Inc. | Weight compensating method and apparatus |
| US5613408A (en) * | 1992-05-21 | 1997-03-25 | Eti Technologies Inc. | Weight compensating method and apparatus |
| US5711190A (en) * | 1992-05-21 | 1998-01-27 | Eti Technologies Inc. | Weight compensating method and apparatus |
| US5724862A (en) * | 1992-05-21 | 1998-03-10 | Eti Technologies Inc. | Dynamic balancing method and apparatus |
| US5768951A (en) * | 1992-05-21 | 1998-06-23 | Eti Technologies Inc. | Dynamic balancing method and apparatus |
| US5816115A (en) * | 1992-05-21 | 1998-10-06 | Eti Technologies Inc. | Weight compensating method and apparatus |
| US5829318A (en) * | 1992-05-21 | 1998-11-03 | Eti Technologies Inc. | Dynamic balancing method and apparatus |
| US5845542A (en) * | 1992-05-21 | 1998-12-08 | Eti Technologies Inc. | Dynamic balancing method and apparatus |
| CN114017487A (en) * | 2021-11-10 | 2022-02-08 | 上海纳铁福传动系统有限公司 | Motor gear shaft system and motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58500886A (en) | 1983-05-26 |
| DE3122288A1 (en) | 1983-01-05 |
| EP0066866A1 (en) | 1982-12-15 |
| DE3267554D1 (en) | 1986-01-02 |
| WO1982004363A1 (en) | 1982-12-09 |
| DE3122288C2 (en) | 1985-05-30 |
| EP0066866B1 (en) | 1985-11-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |