Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-12-02
1998-06-09
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310214, 310216, 310254, 310258, H02K 334
Patent
active
057639787
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an improvement of an insulating member adapted to be disposed in each of a plurality of slots in a stator core of a motor in order to insulate electrically the core and windings set in the slots.
BACKGROUND ART
It is known in the art that insulating members for electrically insulating a core of a motor and windings are arranged individually in a plurality of winding setting slots in the core. Referring to FIG. 9, therefore, a case will be described in which these insulating members are fitted individually in slots formed in the stator core of a synchronous motor that is frequently used as an AC servomotor.
In FIG. 9, reference numerals 1 and 2 denote a rotor and a stator core of a synchronous motor, respectively. The stator core 2 is formed with a plurality of slots 4 that are arranged at regular intervals in the circumferential direction around the stator axis (in line with the axis of the rotor 1). As a result, radially extending teeth 3 are formed individually between the slots 4, and hooks 6 extend individually from the opposite sides of the distal end portion of each tooth 3 in the circumferential direction. A gap with a fixed width is defined between the extended end of the hook 6 of each tooth 3 and the extended end of the hook 6 of its adjacent tooth 3, and serves as an opening 7 leading to each slot 4. This slot opening 7 is utilized for arranging windings 5 in the slot 4.
Set in these slots 4 are windings 5 that are formed of a plurality of coils arranged according to given rules. The windings 5 are loaded into the slots 4 through the slot openings 7. The hooks 6 prevent the windings 5 from slipping out of the slots 4.
In order to insulate the core and each winding 5 electrically, the inner wall surface of each slot 4 (i.e., inner peripheral surface 2a of the core 2, side face 3a of each tooth 3, and one side face 6a of each hook 6) and the opposite end faces (not shown) of each tooth 3 in the axial direction of the stator are covered by an insulating member 8 that is formed of a molding of an electrically insulating resin material.
In the field of servomotors in recent years, in particular, there have been demands for further reduction in external size and improvement in output. The hooks of the teeth of the core tend to be shortened with increase of the space factor (i.e., ratio of the gross sectional area of each winding to the sectional area of each slot) of the windings arranged in the slots of the core.
Thus, if the aforesaid conventional insulating members are used in the motor constructed in this manner, the electrical insulation distance between each winding and the core (tooth hook in particular) is so short that a satisfactory electrical insulation distance required depending on the working conditions of the motor cannot be secured, in some cases.
In order to solve this problem, an arrangement has been contrived so that one such insulating member is formed including a main insulating section c, which encloses the inside of a slot b of a core a, and screenlike auxiliary insulating sections e, which are formed integrally with the main insulating section c and extend radially into the slot b from an opening d of the slot b, whereby a desired electrical insulation distance L can be secured between each winding f and each hook h of each tooth g of the core a, as shown in FIG. 10, and an application for this arrangement has been filed for a Japanese patent (Serial No. 6-149343; KOKAI Publication No. 8-19202) before the priority date of the present application.
According to this insulating member, even in case the space factor of the windings f is increased or the hooks h of the teeth g of the core a are shortened, the desired electrical insulation distance L can be secured between each winding f and each hook h of each tooth g of the core a by appropriately setting the size of extension of the auxiliary insulating sections e.
However, since the auxiliary insulating sections e serve as circumferential screens for the windings f located in t
REFERENCES:
patent: 3735169 (1973-05-01), Balke et al.
patent: 4025840 (1977-05-01), Brissey et al.
patent: 4160926 (1979-07-01), Cope et al.
patent: 4922165 (1990-05-01), Crawford et al.
Tamaki Takeshi
Uchida Hiroyuki
Yamamoto Tomonaga
Enad Elvin G.
Fanuc Ltd.
Stephan Steven L.
LandOfFree
Insulating member for a core of a motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Insulating member for a core of a motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Insulating member for a core of a motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2204005