METHOD OF MOUNTING ATTACHMENT PARTS TO AN ELECTRIC MACHINE

Abstract

In a method of mounting attachment parts to an electric machine, a rotor of the electric machine is non-rotatably supported in a bearing device. A stator of the electric machine is detachably secured in a predefined first installation position by a clamping device, and a first attachment part is mounted to the stator. The clamping device is then released, and the electric machine is operated as motor for a time period sufficient for the stator to rotate in relation to the rotor until reaching a second installation position. The stator is secured by the clamping device in the second installation position, and a second attachment part is mounted to the stator.

Claims

1. A method of mounting attachment parts to an electric machine, said method comprising: non-rotatably supporting a rotor of the electric machine in a bearing device; detachably securing a stator of the electric machine in a predefined first installation position by a clamping device; mounting a first attachment part to the stator; releasing the clamping device; operating the electric machine as motor for a time period sufficient for the stator to rotate in relation to the rotor until reaching a second installation position; securing the stator by the clamping device in the second installation position; and mounting a second attachment part to the stator.

2. The method of claim 1, further comprising checking the electric machine for operativeness, while the stator rotates about the rotor from the first installation position to the second installation position during operation of the electric machine.

3. The method of claim 1, further comprising detecting a position of the stator by position sensors of the electric machine.

4. The method of claim 1, further comprising detecting a position of the stator by position sensors located outside of the electric machine.

5. The method of claim 1, wherein the stator is secured by clamping a stator housing of the stator via the clamping device.

6. The method of claim 1, further comprising energizing a three-phase winding of the stator to operate the electric machine as motor.

7. The method of claim 6, wherein the three-phase winding is adapted to generate a three-phase rotating field.

8. The method of claim 1, further comprising configuring the electric machine as polyphase machine.

9. The method of claim 1, further comprising configuring the electric machine as synchronous machine or asynchronous machine.

10. A method of mounting attachment parts to an electric machine, said method comprising: clamping a stator in a first installation position that allows access from above; lowering a first attachment part onto the stator in the first installation position and mounting the attachment part to the stator; moving the stator with the first attachment part in relation to a stationary rotor of the electric machine away from the first installation position to a second installation position which substantially corresponds to the first installation position as occupied by the stator for mounting the first attachment part; clamping the stator; and lowering a second attachment part onto the stator in the second installation position and mounting the second attachment part to the stator.

11. The method of claim 10, wherein the stator is moved by operating the electric machine as motor for a time period sufficient for the stator to rotate in relation to the rotor until reaching a second installation position.

12. The method of claim 11, wherein the electric machine is operated as motor by energizing a three-phase winding of the stator.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0013] Other features and advantages of the present invention will be more readily apparent upon reading the following description of currently preferred exemplified embodiments of the invention with reference to the accompanying drawing, in which:

[0014] FIG. 1 is a schematic illustration of an electric machine in the form of a rotary field machine on an installation device in a predefined first installation position;

[0015] FIG. 2 is a schematic illustration of the rotary field machine of FIG. 1, depicting installation of a first attachment part onto the rotary field machine in the predefined first installation position;

[0016] FIG. 3 is a schematic illustration of the rotary field machine of FIG. 1 in a second installation position;

[0017] FIG. 4 is a schematic illustration of the rotary field machine of FIG. 3, depicting installation of a second attachment part onto the rotary field machine in the second installation position; and

[0018] FIG. 5 is a block diagram showing a relationship between components involved in a method according to the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0019] Throughout all the figures, same or corresponding elements may generally be indicated by same reference numerals. These depicted embodiments are to be understood as illustrative of the invention and not as limiting in any way. It should also be understood that the figures are not necessarily to scale and that the embodiments may be illustrated by graphic symbols, phantom lines, diagrammatic representations and fragmentary views. In certain instances, details which are not necessary for an understanding of the present invention or which render other details difficult to perceive may have been omitted.

[0020] Turning now to the drawing, and in particular to FIG. 1, there is shown a schematic illustration of an electric machine, generally designated by reference numeral 1, mounted onto an installation device, generally designated by reference numeral 10. The electric machine 1 is represented here, by way of example, as a rotary field machine which can be constructed as synchronous machine or asynchronous machine. The electric machine 1 includes a rotor 1.1, mounted on a rotor shaft 1.10, and a stator 1.2, arranged in a stator housing 1.20. The stator 1.2 includes a stator winding 1.21, configured as rotating field winding or three-phase winding so as to generate a three-phase rotating field.

[0021] The electric machine 1 is mounted onto the installation device 10 by non-rotatably connecting the rotor shaft 1.10 of the rotor 1.1 with a bearing device 10.2 of the installation device 10. As a result, the rotor 1.1 is prevented from rotating in relation to the stator 10.2, when a three-phase current is applied to the stator winding 1.21. Rather, the stator 1.2 is caused to rotate in relation to the rotor 1.1. To fix the stator 1.2 in a predefined installation position Ml, the installation device 10 includes a clamping device 10.2, which has jaws to clamp the stator housing 1.20 in the predefined installation position M1 so as to prevent the stator 1.2 from rotating away from the predefined installation position M1. The jaws of the clamping device 10.2 can be pivoted about their pivot axes, as indicated by the arrows, between a clamping position I, in which the stator housing 1.20 is firmly clamped, as indicated shown in FIG. 1, and a release position II, in which the stator housing 1.20 is liberated, as indicated in FIG. 2.

[0022] In the installation position M1 of the stator 1.2, as shown in FIG. 1, an installer is able to place an attachment part 2 from above, i.e. in z direction, as indicated in FIG. 1, upon a mounting surface 1.22 of the stator housing 1.20. The connection direction, as indicated by arrow F, thus corresponds to the force of gravity or weight force of the attachment part 2. During installation, the stator housing 1.20 remains in the installation position M1 once the stator housing 1.20 is held by the clamping device 10.2 in the clamping position I.

[0023] Once the attachment part 2 has been mounted to the stator housing 1.20, the clamping device 10.2 is released, i.e. pivoted from clamping position I to the release position II, as shown in FIG. 2. At the same time, the stator winding 1.21 is energized with a three-phase current to cause the stator 1.2 to rotate in a rotation direction D about the rotor 1.1. For this purpose, a three-phase alternating current with low frequency of, for example, 0.5 Hz is used to realize a slow rotation speed of the stator 1.2 together with the stator housing 1.20 about the rotor 1.1.

[0024] Current feed to the stator winding 1.21 is stopped, when the stator 1.2 has reached a further installation position M2 which is rotated, for example, by 90 in relation to the predefined installation position M1. This is shown in FIG. 3. Also in this further installation position M2, the installer can mount a further attachment part 3 onto a further mounting surface 1.23 from above, i.e. again in z direction. The connection direction F again corresponds to the force of gravity or weight force now of the attachment part 3.

[0025] When the stator 1.2 has reached the further installation position M2, the clamping device 10.2 is pivoted into the clamping position I, as shown in FIG. 4. As a result, the stator housing 1.20 is securely clamped in the further installation position M2, and the installer is now able to mount the further attachment part 3 to the stator housing 1.20. FIG. 4 shows the electric machine 1 with the installed attachment part 3.

[0026] The position that is assumed by the stator 1.2 as the stator winding 1.21 is energized, is monitored by sensors (FIG. 5) of the electric machine 1 so that the current feed to the stator winding 1.21 can be stopped at the exact right time. As an alternative, the use of external sensors which can be arranged on the installation device 10, is also conceivable for detecting the position of the stator 1.2.

[0027] As the electric machine 1 is operated so as to cause a rotation of the stator 1.2 about the rotor 1.1 from the predefined installation position M1 to the further installation position M2, the electric machine 1 undergoes a function test in which the operativeness of the electric machine 1 is checked, as shown in FIG. 5. Thus, the stator 1.2 is energized for rotation to the further installation position M2 while at the same time the operativeness of the electric machine 1 is checked to execute a final installation control, in which the rotary drive, rotation direction, sensor assembly, electrical and mechanical parameter etc. of the electric machine are checked.

[0028] Further attachment parts can be mounted by repeating the steps of opening the clamping device 10.2, rotating the stator 1.2 together with the stator housing 1.20 to a further installation position, and subsequent clamping of the stator 1.2 in the further installation position, as needed.

[0029] While the invention has been illustrated and described in connection with currently preferred embodiments shown and described in detail, it is not intended to be limited to the details shown since various modifications and structural changes may be made without departing in any way from the spirit and scope of the present invention. The embodiments were chosen and described in order to explain the principles of the invention and practical application to thereby enable a person skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.

[0030] What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims and includes equivalents of the elements recited therein: