GB2201298A - Cooling/mounting electromechanical drive means components - Google Patents

Cooling/mounting electromechanical drive means components Download PDF

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Publication number
GB2201298A
GB2201298A GB08729361A GB8729361A GB2201298A GB 2201298 A GB2201298 A GB 2201298A GB 08729361 A GB08729361 A GB 08729361A GB 8729361 A GB8729361 A GB 8729361A GB 2201298 A GB2201298 A GB 2201298A
Authority
GB
United Kingdom
Prior art keywords
motor
drive means
tunnel
brake
cooling
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.)
Granted
Application number
GB08729361A
Other versions
GB2201298B (en
GB8729361D0 (en
Inventor
Olavi Jussila
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kone Corp
Original Assignee
Kone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from FI865294A external-priority patent/FI77754C/en
Application filed by Kone Corp filed Critical Kone Corp
Publication of GB8729361D0 publication Critical patent/GB8729361D0/en
Publication of GB2201298A publication Critical patent/GB2201298A/en
Application granted granted Critical
Publication of GB2201298B publication Critical patent/GB2201298B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D3/00—Portable or mobile lifting or hauling appliances
    • B66D3/18—Power-operated hoists
    • B66D3/20—Power-operated hoists with driving motor, e.g. electric motor, and drum or barrel contained in a common housing
    • B66D3/22—Power-operated hoists with driving motor, e.g. electric motor, and drum or barrel contained in a common housing with variable-speed gearings between driving motor and drum or barrel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/30—Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/32—Structural association of asynchronous induction motors with auxiliary mechanical devices, e.g. with clutches or brakes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

An electromechanical drive means comprising an a.c. motor (1) provided with a brake (2), a frequency converter provided with a control unit (9) and supplying the motor, and a gear (3) to change the rotational speed of the motor. To achieve efficient cooling, the drive means is provided with a cooling tunnel (5) housing the motor and the brake, the control unit (9) and the power stage semiconductor switches (8a-8f) of the frequency converter being located on the outer walls of this tunnel, the transmission gear (3) being located in the tunnel or close to it. <IMAGE>

Description

ELECTROMECHANICAL DRIVE MEANS The present invention concerns an electromechanical drive means comprising an a.c. motor provided with a brake, a frequency converter provided with a control unit and supplying the motor, and a gear to produce a rotational speed differing from that of the motor.
The hoisting motors currently used in hoisting means, such as cranes, are bulky and expensive. The electronic equipment controlling the motor occupies a large space and is placed in separate instrument cabinets. The separate placement of the electronics involves the use of long cables. Moreover, high-power motors require a sizeable brake which also takes up a large space.
The object of the present invention is to eliminate the drawbacks mentioned. The electromechanical drive means of the invention is characterized in that it comprises a cooling tunnel housing the motor and the brake, the control unit and the power stage semiconductor switches of the frequency converter being located on the outer walls of this tunnel, the transmission gear being located in the tunnel or close to it. In the drive unit of the invention, all heat generating components are placed inside or around the same cooling tunnel. The transmission gear reduces the rotational speed to the required level, so that the drive unit may substitute a motor controlled by the mains frequency. As the frequency converter makes it possible to use a low motor torque, the brake required for the motor is also small. The drive means of the invention is smaller in volume than a normal-frequency motor.The same motor can be used within a wide power range, which is of advantage in view of maintenance and spare parts. Furthermore, the cable and wiring connections are short.
An advantageous embodiment of the electromechanical drive means of the invention is characterized in that the drive means is provided with a fan which produces an air flow through the tunnel to cool the transmission gear, the motor, the brake and the control unit and power semiconductor switches of the frequency converter.
Another advantageous embodiment of the electromechanical drive means of the invention is characterized in that the tunnel is provided with internal cooling ribs.
A further advantageous embodiment of the electromechanical drive means of the invention is characterized in that the transmission gear is a reduction gear which reduces the rotational speed of the motor.
Yet another advantageous embodiment of the electromechanical drive means of the invention is characterized in that the tunnel is equipped with a tachometer to provide speed feedback.
The invention is described in the following in greater detail by the aid of an example referring to the drawing attached, in which Fig. 1 represents the hoisting motor unit of the invention.
Fig. 2 shows the hoisting motor unit as sectioned along the line A-A.
The hoisting motor unit shown in fig. 1, which is intended for use in a crane or equivalent, comprises a squirrel-cage motor 1 provided with a disc brake 2. The squirrel-cage motor 1 is coupled to a reduction gear 3 to produce a lower rotational speed. The motor 1 is located in the cooling tunnel 5, the brake 2 being mounted on the motor 1. For improved air circulation, indicated by arrows in fig. 1, the cooling tunnel 5 is provided with a fan 4. As shown in fig.
1, the reduction gear 3 is located at the orifice of the tunnel 5. The gear is mounted on a flange 6 with which the hoisting motor unit 1 is attached to a crane or equivalent.
Fig. 2 shows the hoisting motor unit as sectioned along the line A-A in fig 1. The tunnel 5 is provided with internal cooling ribs 7 for improved cooling efficiency. The cooling ribs may be made e.g. of extruded sectional aluminium. The cooling ribs 7 provide a large cooling surface. The frequency converter, which consists of a power stage and a control unit, supplies the motor with a frequency exceeding the mains frequency, e.g. 70-300 Hz or above. The power available from the motor increases in proportion to the frequency. Thus, at a frequency of 300 Hz the motor yields a power about six times that obtained at a frequency of 50 Hz.
Using a reduction gear 3 as shown in fig. 1, the speed of rotation is reduced to within the range 1000-1500 r/min, which is the standard speed range of a squirrel-cage motor operated from a 50 Hz or 60 Hz mains supply. Thus the hoisting motor unit is interchangeable with a mains-operated squirrel-cage motor. As shown in fig. 2, the control unit 9 and the power transistors 8a-8f of the power stage of the frequency converter are mounted on the external walls of the cooling tunnel 5, the control unit 9 being located on one wall and the transistors 8a-8f of the three-phase frequency converter on the other three walls.
In addition to the brake 2, a tachometer 10 may be mounted on the motor to provide speed feedback. When the reduction gear 3 is placed as shown in fig. 1 in the vicinity of the orifice of the tunnel 5, all heat generating components are located close to the cooling tunnel, the result being a concentrated cooling system that efficiently cools the transmission gear 3, the motor 1, the brake 2 as well as the power stage and control unit 9 of the converter. A stepless speed control system, rendered possible by the use of a frequency converter, is thus located in the same unit with the motor 1.
It is obvious to a person skilled in the art that the embodiments of the invention are not restricted to the example discussed above, but that they may instead be varied within the scope of the following claims.

Claims (6)

1. An electromechanical drive means comprising an a.c. motor provided with a brake, a frequency converter provided with a control unit and supplying the motor, and a gear to change the rotational speed of the motor, wherein the drive means comprises a cooling tunnel housing the motor and the brake, the control unit and the power stage semiconductor switches of the frequency converter being located on the outer walls of this tunnel, the transmission gear being located in the tunnel or close to it.
2. Drive means according to claim 1, wherein the drive means is provided with a fan which produces an air flow through the tunnel to cool the transmission gear, the motor, the brake and the power semiconductor switches and control unit of the frequency converter.
3. Drive means according to claim 1 or 2, wherein the tunnel is provided with internal cooling ribs.
4. Drive means according to any one of the preceding claims, wherein the transmission gear is a reduction gear which provides a rotational speed below that of the motor.
5. Drive means according to any one of the claims 14, wherein the tunnel is equipped with a tachometer to provide speed feedback.
6. An electromechanical drive means substantially as herein described and as illustrated in the accompanying drawings.
GB8729361A 1986-12-23 1987-12-16 Cooling and mounting of components of an electromechanical drive means Expired - Lifetime GB2201298B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI865294A FI77754C (en) 1986-12-23 1986-12-23 Lift motor unit.
FI874797A FI77755C (en) 1986-12-23 1987-10-30 ELEKTROMEKANISK DRIVANORDNING.

Publications (3)

Publication Number Publication Date
GB8729361D0 GB8729361D0 (en) 1988-01-27
GB2201298A true GB2201298A (en) 1988-08-24
GB2201298B GB2201298B (en) 1991-01-02

Family

ID=26158059

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8729361A Expired - Lifetime GB2201298B (en) 1986-12-23 1987-12-16 Cooling and mounting of components of an electromechanical drive means

Country Status (7)

Country Link
ES (1) ES2006009A6 (en)
FI (1) FI77755C (en)
GB (1) GB2201298B (en)
IT (1) IT1213955B (en)
NL (1) NL188969C (en)
NO (1) NO172317C (en)
SE (1) SE500313C2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0642207A1 (en) * 1993-09-02 1995-03-08 Gec Alsthom Transport Sa Geared motor unit
EP1092451A3 (en) * 1999-09-30 2002-12-11 Nihon Kohden Corporation Air-cooling system for a urinary incontinence device
EP3408207A4 (en) * 2016-01-25 2019-09-25 Kone Corporation An elevator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0642207A1 (en) * 1993-09-02 1995-03-08 Gec Alsthom Transport Sa Geared motor unit
FR2709617A1 (en) * 1993-09-02 1995-03-10 Gec Alsthom Transport Sa Geared motor assembly.
EP1092451A3 (en) * 1999-09-30 2002-12-11 Nihon Kohden Corporation Air-cooling system for a urinary incontinence device
US6527694B1 (en) 1999-09-30 2003-03-04 Nihon Kohden Corporation Air-cooling device for coil for urinary incontinence treatment
EP3408207A4 (en) * 2016-01-25 2019-09-25 Kone Corporation An elevator

Also Published As

Publication number Publication date
FI77755C (en) 1989-04-10
NO875337D0 (en) 1987-12-21
NL8703049A (en) 1988-07-18
SE8705129L (en) 1988-06-24
SE8705129D0 (en) 1987-12-22
NL188969B (en) 1992-06-16
NO875337L (en) 1988-06-24
IT1213955B (en) 1990-01-05
SE500313C2 (en) 1994-05-30
FI77755B (en) 1988-12-30
IT8712606A0 (en) 1987-12-18
NO172317C (en) 1993-06-30
GB2201298B (en) 1991-01-02
FI874797A0 (en) 1987-10-30
ES2006009A6 (en) 1989-04-01
NL188969C (en) 1992-11-16
GB8729361D0 (en) 1988-01-27
FI874797A (en) 1988-06-24

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20071215