CA2119333C - Auxiliary crawling device - Google Patents
Auxiliary crawling deviceInfo
- Publication number
- CA2119333C CA2119333C CA002119333A CA2119333A CA2119333C CA 2119333 C CA2119333 C CA 2119333C CA 002119333 A CA002119333 A CA 002119333A CA 2119333 A CA2119333 A CA 2119333A CA 2119333 C CA2119333 C CA 2119333C
- Authority
- CA
- Canada
- Prior art keywords
- motor
- synchronous motor
- large synchronous
- clutch mechanism
- operatively connecting
- 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
-
- 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
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Multiple Motors (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
An energy saving apparatus providing slow rotation of large synchronous motors (over 4000 HP) for the duration of a period of inactivity when the power supply to the motor has been stopped due to lack of requirement of the product of the motor's work.
Normally these motors would consume the electricity required to overcome inertia in the standby, ready mode, until such time as these motors are required to resume full load working operation.
The energy saving apparatus rotates the large synchronous motor and its driven components at one-tenth normal speed.
Normally these motors would consume the electricity required to overcome inertia in the standby, ready mode, until such time as these motors are required to resume full load working operation.
The energy saving apparatus rotates the large synchronous motor and its driven components at one-tenth normal speed.
Description
Backy r 0~
This invention relates to the slow rotation of large synchronous motor masses during periods of no-load operation. 5 In industries using large synchronous motors of 4000 to ~4000 HP, such as wood pulping mills known as Pulp Mills, it is normal practice to allow the 10 large motors to run in idle mode or free-wheel during periods when the product of full load operation is not needed. In a Stone Groundwood 15 Pulp Mill, for example, the electricity required to maintain rotation of the large motor and its ceramic abrasive driven components, known as 20 pulpstones, in a Grinder is 200 to 500 kW. This is a significant cost burden for a Pulp & Paper Company to carry as operating cost. 25 Alternatively, the large motors are simply stopped for the duration of the period of non-requirement of the wood pulp which is the product of their 30 work. In many cases this sudden stoppage produces a condition known as Thermal Shock to the ceramic abrasive body on the working surface of the large 35 motor's driven components, the pulpstones. The normal fully loaded operating temperature of the pulpstones in the grinder chamber is 70 to 95 C. Rapid40 cooling due to shut down of the motor, and subsequent rapid warm up when the motor and driven components are returned to service generates rapid 45 contraction ~ expansion in the ceramic body of the pulpstone, leading to the Thermal Shock condition. This causes damage requiring repair by skilled 50 masons. In addition, the inrush ~ -' - 2 current during start up of the large synchronous motor causes wear to the starter by arcing and occasional welding of the ~ contacts. This requires - frequent maintenance by skilled technicians, and replacement of the contacts, increasing the operating cost of the large ~0 synchronous motor.
Specification A primary object of this 5 invention is to provide an energy saving apparatus to be used for the slow rotation of large synchronous motors during periods when the motor is idle, ~D not being used for its primary function of rotating auxiliary components, for example, ceramic pulp stones in wood grinders for the production of ~5 wood pulp.
This invention is a crawling device utilizing a small electric motor to rotate a 3~ large synchronous motor and its auxiliaries at one-tenth normal speed of 225-350 rpm while consuming 10% of normal power draw of 200-500 Kw. It provides rotation of the large motor in ~ a manner that facilitates return to normal speed and ready mode.
Another object of this ~ invention is to provide apparatus to assist the re-start and return to service of the large synchronous motor and 5 its driven components reducing ~ damage to the power transfer equipment such as motor starter and switches Another object of this invention is to provide process temperature changes generated when the large synchronous motor stops rotating.
It is common in the operation of large synchronous motors to allow the motor to rotate in a no-load mode which is referred to as idling. During this period of idle operation, the large motor rotates at its normal rotation speed, consuming the electricity required to move the motor itself, and its driven components for example, the pulpstones described earlier, for the duration of the idle period. This is wasteful of electricity. It is common in the operation of large synchronous motors to stop the synchronous motor for a period of time for various reasons, either for lack of need of the synchronous motor's end product; or to perform maintenance to the synchronous motor, or to its driven component(s). At the moment of re-starting the synchronous motor, a large amount of electricity is consumed while overcoming the inertia of the synchronous motor and its driven component(s). This is wasteful of electricity.
DRAWINGS
In drawings which illustrate the invention, Figure 1 is an elevation of one example.
Figure 2 is a plan view of the portrayal in Figure 1. Figure 3 is a plan view of the preferred application. Fig.4 is a layout diagram of the preferred application shown with a large motor and auxiliaries.
3 ~
apparatus for jogging the motor and its auxiliaries during periods of repair and inspection, at lower energy 5 cost and without damage to or ~ wear of the large motor starter and switches contacts.
Another object of this invention is to provide ~ apparatus to pre-start the, large motor's rotation to avoid power surge cost of starting an immobile large synchronous motor and its driven components i5 and to reduce maintenance cost to the large motor starter and switches.
An object of this invention is the reduction of waste of ~a electricity. This is achieved, with the crawling device, by stopping the electrical power flow to the large synchronous motor and independently maintaining the large synchronous motor and its driven component(s) in continuous rotation at reduced ~ speed during an idling period.
3 This greatly reduces the amount, of electricity required while idling the motor, as well as the amount required to return the large synchronous motor to ~5 its normal operating service, speed. When it is required to start the large synchronous motor from a complete stop, the crawling device can be used as a re-starter, reducing the amount of electricity required to overcome inertia.
A further object of this invention is the reduction of accidental damage caused by the, thermal shock generated to the large synchronous motor's driven components for example, ceramic surfaced pulpstones used in a wood pulping mill,, which are sensitive to thermal r shock generated by sudden ~ ~t ~
3 ~ 3 DESCRIPTION
Referring to the drawings,the crawling device is coupled to the large synchronous motor shaft or to the driven ~ component(s)'s shaft 5 through couplings 4, pulleys and belts, or a belt and sprocket arrangement.
i~ The low horsepower motor 1 is electrically interlocked to the large synchronous motor switch in such a fashion that when electrical supply to the large j~ synchronous motor is stopped, ~~ electrical supply to the low horsepower motor 1 is activated through an electronic soft start, starting rotation of the smaller motor. Motor force is transmitted via pulleys 6 and belt 7, to the speed reducing gear assembly 3. As the rotating speed of the large synchronous motor decreases - from normal operational rotational speed to the pre-selected lower rotation speed, one-tenth of operational speed, 3~ the clutch mechanism 4 engages, and rotation of the large synchronous motor and its components is controlled by the crawling device, which maintains the low rotation speed for the duration of the idle period.
When it is desired to restart the large synchronous motor, the supply of electricity is restored to the large synchronous motor. The electric interlock switch stops electrical supply to the low horsepower motor causing it to stop transmitting power to the speed reducer. As the rotation speed of the large synchronous motor increases, the clutch S~ mechanism disengages, goes into free-wheel mode and the reducing gear and small motor come to rest.
It is common in the operation of large synchronous motors to stop the electrical supply to the synchronous motor and stop it completely for an extended period for repair to or modification of or inspection of the large synchronous motor 0 or to its driven component(s).
During these periods of repair or modification or inspection, it is common to frequently apply short bursts of electricity or jogs to the large synchronous motor to move its rotating element's periphery or the periphery of the driven components to a desired location. This is wasteful of electricity and time consuming because of the freewheeling nature of the large synchronous motor which is generally not fitted with a braking device. When it is desired to start and rotate the large synchronous motor and its driven component(s) by increments, the jogging switch is used to temporarily apply electricity to the low horsepower motor, transmitting power through the speed reducing gear assembly and the clutch mechanism to gradually move the periphery of the large synchronous motor or the periphery(ies) of the driven component(s) to a desired location. The use of the crawling device reduces the electrical consumption and maintenance time.
It is common, on completion of repairs to or inspection of or modification of large synchronous motors or their driven component(s) to start the large synchronous motor from a dead stop by allowing the flow of electricity through ~ ~ 7 ~
a switch. During this process, the large synchronous motor must first overcome its inertia and that of its driven component(s). This is wasteful of electricity. The crawling device overcomes this, by applying electricity through the manual switch and starting the lower horsepower motor, thus applying power through the speed reducer and the clutch mechanism to overcome inertia and begin rotating the large synchronous motor and its driven component(s). When the large synchronous motor and its driven component(s) reach the preset idling rotational speed, the switch may be thrown on the large synchronous motor, to apply electricity allowing it to increase speed to normal operation. As the speed of the large synchronous motor increases past the preset idling speed, the interlock stops the flow of electricity to the low horsepower motor, the clutch mechanism on the auxiliary crawling device disengages, bringing the speed reducing gear assembly and the motor to rest. The use of the crawling device reduces the amount of electricity required when starting the large synchronous motor from a dead stop.
The crawling device illustrated comprises a low horsepower(30 to 100 horsepower) motor 1, an electronic soft start 2, a speed reducing gear assembly 3, a clutch assembly 4, and couplings 5, for attachment to a shaft A, which is to be driven. It may be any suitable attachment but, in the form shown, the clutch mechanism 4, is coupled to the shaft end of 3 3 ~ ~
the large synchronous motor's driven component. The driven component's shaft is supported by bearing post B.
When electrical supply to the large synchronous motor is stopped, an electric interlock activates the low horsepower motor 1 through an electronic 0 soft start 2. The motor turns the speed reducing gear assembly 3, by way of a belt 7, and pulley 6, arrangement. The output shaft, of the speed reducing gear assembly 3, is attached to a clutch mechanism 4. The body of the clutch mechanism 4 is attached by couplings 5 to the shaft A of the large synchronous motor's driven component(s). The clutch mechanism is set to engage as the rotational speed of the large synchronous motor and its component(s) assembly decreases from its normal operating speed to the preset crawling speed. The crawling device becomes the driving force, rotating the large synchronous motor and its attached components at the lower speed during the idle period.
At the end of the idle period, electric power is restored to the large synchronous motor and the assembly begins rotating at higher speeds. The electric interlock stops the low horsepower motor 1, and the clutch mechanism 4 disengages and goes to free-wheel mode, the speed reducing gear assembly 3 stops, and the crawling device comes to rest.
In the event that the large synchronous motor and its attached component(s) has been completely stopped; when it is ' desired to restart it, a manual ,~
Q
3 ~ 3 ~4 switch is used to first start the low horsepower motor 1, that activates the crawling device to turn the large synchronous motor and its driven component(s). When the crawling device has achieved its preset crawling speed, electric power is restored to jD the large synchronous motor, the clutch mechanism 4, disengages, goes into free-wheel mode, and the crawling device comes to rest.
j5 The continuous slow rotation ~ of the large synchronous motor and its component(s) results in a more even distribution of the process-generated heat in the driven components' housings, ~ and contributes to the more efficient operation of the process to which the motor and its component(s) are dedicated.
This invention relates to the slow rotation of large synchronous motor masses during periods of no-load operation. 5 In industries using large synchronous motors of 4000 to ~4000 HP, such as wood pulping mills known as Pulp Mills, it is normal practice to allow the 10 large motors to run in idle mode or free-wheel during periods when the product of full load operation is not needed. In a Stone Groundwood 15 Pulp Mill, for example, the electricity required to maintain rotation of the large motor and its ceramic abrasive driven components, known as 20 pulpstones, in a Grinder is 200 to 500 kW. This is a significant cost burden for a Pulp & Paper Company to carry as operating cost. 25 Alternatively, the large motors are simply stopped for the duration of the period of non-requirement of the wood pulp which is the product of their 30 work. In many cases this sudden stoppage produces a condition known as Thermal Shock to the ceramic abrasive body on the working surface of the large 35 motor's driven components, the pulpstones. The normal fully loaded operating temperature of the pulpstones in the grinder chamber is 70 to 95 C. Rapid40 cooling due to shut down of the motor, and subsequent rapid warm up when the motor and driven components are returned to service generates rapid 45 contraction ~ expansion in the ceramic body of the pulpstone, leading to the Thermal Shock condition. This causes damage requiring repair by skilled 50 masons. In addition, the inrush ~ -' - 2 current during start up of the large synchronous motor causes wear to the starter by arcing and occasional welding of the ~ contacts. This requires - frequent maintenance by skilled technicians, and replacement of the contacts, increasing the operating cost of the large ~0 synchronous motor.
Specification A primary object of this 5 invention is to provide an energy saving apparatus to be used for the slow rotation of large synchronous motors during periods when the motor is idle, ~D not being used for its primary function of rotating auxiliary components, for example, ceramic pulp stones in wood grinders for the production of ~5 wood pulp.
This invention is a crawling device utilizing a small electric motor to rotate a 3~ large synchronous motor and its auxiliaries at one-tenth normal speed of 225-350 rpm while consuming 10% of normal power draw of 200-500 Kw. It provides rotation of the large motor in ~ a manner that facilitates return to normal speed and ready mode.
Another object of this ~ invention is to provide apparatus to assist the re-start and return to service of the large synchronous motor and 5 its driven components reducing ~ damage to the power transfer equipment such as motor starter and switches Another object of this invention is to provide process temperature changes generated when the large synchronous motor stops rotating.
It is common in the operation of large synchronous motors to allow the motor to rotate in a no-load mode which is referred to as idling. During this period of idle operation, the large motor rotates at its normal rotation speed, consuming the electricity required to move the motor itself, and its driven components for example, the pulpstones described earlier, for the duration of the idle period. This is wasteful of electricity. It is common in the operation of large synchronous motors to stop the synchronous motor for a period of time for various reasons, either for lack of need of the synchronous motor's end product; or to perform maintenance to the synchronous motor, or to its driven component(s). At the moment of re-starting the synchronous motor, a large amount of electricity is consumed while overcoming the inertia of the synchronous motor and its driven component(s). This is wasteful of electricity.
DRAWINGS
In drawings which illustrate the invention, Figure 1 is an elevation of one example.
Figure 2 is a plan view of the portrayal in Figure 1. Figure 3 is a plan view of the preferred application. Fig.4 is a layout diagram of the preferred application shown with a large motor and auxiliaries.
3 ~
apparatus for jogging the motor and its auxiliaries during periods of repair and inspection, at lower energy 5 cost and without damage to or ~ wear of the large motor starter and switches contacts.
Another object of this invention is to provide ~ apparatus to pre-start the, large motor's rotation to avoid power surge cost of starting an immobile large synchronous motor and its driven components i5 and to reduce maintenance cost to the large motor starter and switches.
An object of this invention is the reduction of waste of ~a electricity. This is achieved, with the crawling device, by stopping the electrical power flow to the large synchronous motor and independently maintaining the large synchronous motor and its driven component(s) in continuous rotation at reduced ~ speed during an idling period.
3 This greatly reduces the amount, of electricity required while idling the motor, as well as the amount required to return the large synchronous motor to ~5 its normal operating service, speed. When it is required to start the large synchronous motor from a complete stop, the crawling device can be used as a re-starter, reducing the amount of electricity required to overcome inertia.
A further object of this invention is the reduction of accidental damage caused by the, thermal shock generated to the large synchronous motor's driven components for example, ceramic surfaced pulpstones used in a wood pulping mill,, which are sensitive to thermal r shock generated by sudden ~ ~t ~
3 ~ 3 DESCRIPTION
Referring to the drawings,the crawling device is coupled to the large synchronous motor shaft or to the driven ~ component(s)'s shaft 5 through couplings 4, pulleys and belts, or a belt and sprocket arrangement.
i~ The low horsepower motor 1 is electrically interlocked to the large synchronous motor switch in such a fashion that when electrical supply to the large j~ synchronous motor is stopped, ~~ electrical supply to the low horsepower motor 1 is activated through an electronic soft start, starting rotation of the smaller motor. Motor force is transmitted via pulleys 6 and belt 7, to the speed reducing gear assembly 3. As the rotating speed of the large synchronous motor decreases - from normal operational rotational speed to the pre-selected lower rotation speed, one-tenth of operational speed, 3~ the clutch mechanism 4 engages, and rotation of the large synchronous motor and its components is controlled by the crawling device, which maintains the low rotation speed for the duration of the idle period.
When it is desired to restart the large synchronous motor, the supply of electricity is restored to the large synchronous motor. The electric interlock switch stops electrical supply to the low horsepower motor causing it to stop transmitting power to the speed reducer. As the rotation speed of the large synchronous motor increases, the clutch S~ mechanism disengages, goes into free-wheel mode and the reducing gear and small motor come to rest.
It is common in the operation of large synchronous motors to stop the electrical supply to the synchronous motor and stop it completely for an extended period for repair to or modification of or inspection of the large synchronous motor 0 or to its driven component(s).
During these periods of repair or modification or inspection, it is common to frequently apply short bursts of electricity or jogs to the large synchronous motor to move its rotating element's periphery or the periphery of the driven components to a desired location. This is wasteful of electricity and time consuming because of the freewheeling nature of the large synchronous motor which is generally not fitted with a braking device. When it is desired to start and rotate the large synchronous motor and its driven component(s) by increments, the jogging switch is used to temporarily apply electricity to the low horsepower motor, transmitting power through the speed reducing gear assembly and the clutch mechanism to gradually move the periphery of the large synchronous motor or the periphery(ies) of the driven component(s) to a desired location. The use of the crawling device reduces the electrical consumption and maintenance time.
It is common, on completion of repairs to or inspection of or modification of large synchronous motors or their driven component(s) to start the large synchronous motor from a dead stop by allowing the flow of electricity through ~ ~ 7 ~
a switch. During this process, the large synchronous motor must first overcome its inertia and that of its driven component(s). This is wasteful of electricity. The crawling device overcomes this, by applying electricity through the manual switch and starting the lower horsepower motor, thus applying power through the speed reducer and the clutch mechanism to overcome inertia and begin rotating the large synchronous motor and its driven component(s). When the large synchronous motor and its driven component(s) reach the preset idling rotational speed, the switch may be thrown on the large synchronous motor, to apply electricity allowing it to increase speed to normal operation. As the speed of the large synchronous motor increases past the preset idling speed, the interlock stops the flow of electricity to the low horsepower motor, the clutch mechanism on the auxiliary crawling device disengages, bringing the speed reducing gear assembly and the motor to rest. The use of the crawling device reduces the amount of electricity required when starting the large synchronous motor from a dead stop.
The crawling device illustrated comprises a low horsepower(30 to 100 horsepower) motor 1, an electronic soft start 2, a speed reducing gear assembly 3, a clutch assembly 4, and couplings 5, for attachment to a shaft A, which is to be driven. It may be any suitable attachment but, in the form shown, the clutch mechanism 4, is coupled to the shaft end of 3 3 ~ ~
the large synchronous motor's driven component. The driven component's shaft is supported by bearing post B.
When electrical supply to the large synchronous motor is stopped, an electric interlock activates the low horsepower motor 1 through an electronic 0 soft start 2. The motor turns the speed reducing gear assembly 3, by way of a belt 7, and pulley 6, arrangement. The output shaft, of the speed reducing gear assembly 3, is attached to a clutch mechanism 4. The body of the clutch mechanism 4 is attached by couplings 5 to the shaft A of the large synchronous motor's driven component(s). The clutch mechanism is set to engage as the rotational speed of the large synchronous motor and its component(s) assembly decreases from its normal operating speed to the preset crawling speed. The crawling device becomes the driving force, rotating the large synchronous motor and its attached components at the lower speed during the idle period.
At the end of the idle period, electric power is restored to the large synchronous motor and the assembly begins rotating at higher speeds. The electric interlock stops the low horsepower motor 1, and the clutch mechanism 4 disengages and goes to free-wheel mode, the speed reducing gear assembly 3 stops, and the crawling device comes to rest.
In the event that the large synchronous motor and its attached component(s) has been completely stopped; when it is ' desired to restart it, a manual ,~
Q
3 ~ 3 ~4 switch is used to first start the low horsepower motor 1, that activates the crawling device to turn the large synchronous motor and its driven component(s). When the crawling device has achieved its preset crawling speed, electric power is restored to jD the large synchronous motor, the clutch mechanism 4, disengages, goes into free-wheel mode, and the crawling device comes to rest.
j5 The continuous slow rotation ~ of the large synchronous motor and its component(s) results in a more even distribution of the process-generated heat in the driven components' housings, ~ and contributes to the more efficient operation of the process to which the motor and its component(s) are dedicated.
Claims (3)
1 In a large synchronous motor assembly of 4000 to 14000 HP having a rotor and having auxiliary driven components, a crawling device to rotate the motor and its driven components during periods of no load rotation comprising:
a. an electric interlock at the large motor switch operatively connected to the crawl device motor starter;
b. a small horse power motor (30 - 100 HP) c. a control switch operatively connected to the crawl device motor starter;
d. means connecting the small horsepower motor switch to an appropriate power supply.
e. an electronic soft-start device operatively connecting the small motor and the small motor starter;
f. a speed reducer operatively connecting the small horsepower motor and a clutch mechanism;
g. a clutch mechanism operatively connecting the speed reducer and the coupling;
h. a coupling arrangement comprising two sprockets and a reinforced notched polyurethane belt operatively connecting the clutch mechanism and the large synchronous motor shaft.
a. an electric interlock at the large motor switch operatively connected to the crawl device motor starter;
b. a small horse power motor (30 - 100 HP) c. a control switch operatively connected to the crawl device motor starter;
d. means connecting the small horsepower motor switch to an appropriate power supply.
e. an electronic soft-start device operatively connecting the small motor and the small motor starter;
f. a speed reducer operatively connecting the small horsepower motor and a clutch mechanism;
g. a clutch mechanism operatively connecting the speed reducer and the coupling;
h. a coupling arrangement comprising two sprockets and a reinforced notched polyurethane belt operatively connecting the clutch mechanism and the large synchronous motor shaft.
2 A crawling device means as claimed in Claim 1 wherein the coupling arrangement is a floating shaft design operatively connecting the clutch mechanism and the large synchronous motor shaft.
3 A crawling device means as claimed in Claim 1 wherein the control switch operatively connecting the crawl device motor to a power supply embodies a control means to incrementally rotate the large synchronous motor and its driven components, such incremental rotative movement commonly known as jogging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002119333A CA2119333C (en) | 1994-03-17 | 1994-03-17 | Auxiliary crawling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002119333A CA2119333C (en) | 1994-03-17 | 1994-03-17 | Auxiliary crawling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2119333A1 CA2119333A1 (en) | 1995-09-18 |
| CA2119333C true CA2119333C (en) | 1999-02-02 |
Family
ID=4153196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002119333A Expired - Fee Related CA2119333C (en) | 1994-03-17 | 1994-03-17 | Auxiliary crawling device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2119333C (en) |
-
1994
- 1994-03-17 CA CA002119333A patent/CA2119333C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2119333A1 (en) | 1995-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |