A calculation method for optimizing the design of motor dimension chain

Abstract

The present invention discloses an optimization design calculation method for a motor dimension chain, comprising the following steps: 1) assembling a bearing I (3), a bearing retaining ring (11), a bearing II (12) and a rotor of a motor to form a motor rotor, and obtaining axially relevant dimensions of the motor rotor; 2) assembling a stator, a front end cover (4) and a rear end cover (13) to form a motor stator, and obtaining axially relevant dimensions of the motor stator; 3) installing an adjustment washer (2), and calculating an actual required axial clearance ΔX4 of the motor and an actual deviation ΔX3 of the axial center positions of the stator and rotor; and 4) adjusting the positions of the motor stator and rotor obtained in step 5) according to the actual required axial clearance ΔX4 of the motor and the axial center position deviation ΔX3 of the stator and rotor. The present invention improves motor power density, motor performance parameter consistency, and motor index compliance rate at critical times through refined design.

Description

Technical Field

[0001] The present invention relates to the field of motor design, and in particular to an optimization design calculation method for a motor dimension chain. Background Art

[0002] Motors that require axial clearance usually use dimension chain calculations to determine the theoretical axial clearance, but the actual axial clearance requirements of the motor are not considered.

[0003] When assembling the motor, the axial clearance adjusted with the axial adjustment washer will deviate from the theoretically designed axial clearance of the motor, causing the axial center positions of the stator and rotor to deviate from the theoretically calculated values.

[0004] This deviation will cause parameters such as motor speed and current to deviate from the design values, thereby reducing the volume utilization and power density of the motor. The impact is particularly significant when critical motor indicators are required. Summary of the Invention

[0005] The object of the present invention is to provide a method for calculating the optimal design of a motor dimension chain, comprising the following steps:

[0006] 1) Perform electrical machining on the motor shaft, armature core, winding, and commutator components to form the rotor assembly of the motor.

[0007] In step 1), after electro-machining assembly, the motor shaft, armature core and winding, and commutator assembly are vacuum dipped in varnish.

[0008] 2) Assemble bearing I, bearing retaining ring, bearing II and the rotor of the motor to form the motor rotor, and obtain the axial dimensions of the motor rotor.

[0009] The axially related dimensions of the motor rotor include the dimension A from the front end cover stop to the bottom of its bearing chamber, the dimension B of the casing with the built-in magnetic circuit ring, the dimension C from the rear end cover stop to the bottom of its bearing chamber, the dimension D from the left end face of the casing with the built-in magnetic circuit ring to the left main pole screw hole, and the dimension E between the two main pole screw holes of the casing with the built-in magnetic circuit ring.

[0010] 3) Assemble the housing with built-in magnetic circuit coil, magnetic steel, and main pole shoes to form a stator assembly.

[0011] 4) Assemble the stator assembly, front cover, and rear cover to form the motor stator, and obtain the axial dimensions of the motor stator.

[0012] The axial-related dimensions of the motor stator include the size a of the two bearing gaps on the motor shaft, the thickness dimension b of bearing I, the thickness dimension c of the bearing retaining ring, the thickness dimension d of bearing II, the length e of the armature core part of the armature core and winding, the thickness dimension h of the adjusting washer, and the dimension i between the bearing gap on the left side of the motor shaft and the left side of the armature core and winding.

[0013] 5) Assemble the motor rotor obtained in step 2) and the motor stator obtained in step 4) together, and calculate the theoretical axial clearance △X2 of the motor and the theoretical deviation △X1 of the axial center position of the stator and rotor.

[0014] 6) Install the adjusting washers and calculate the actual required axial clearance △X4 of the motor and the actual deviation △X3 of the axial center position of the stator and rotor.

[0015] The theoretical deviation △X1 of the stator and rotor axial center positions is as follows:

[0016] ΔX1=(C+BDE / )-(d+c+f+eg / )(1)

[0017] In the formula, B represents the size of the casing with built-in magnetic circuit ring. C represents the size from the stop of the rear end cover to the bottom of its bearing chamber. D represents the size from the left end face of the casing with built-in magnetic circuit ring to the main pole screw hole on the left side. E represents the size between the two main pole screw holes of the casing with built-in magnetic circuit ring. c represents the thickness of the bearing retaining ring. d represents the thickness of bearing II. e represents the length of the armature core part of the armature core and winding. f represents the length between the bearing stop on the right side of the motor shaft and the left side of the armature core of the armature core and winding. g represents the length of the armature core part of the armature core and winding.

[0018] The theoretical axial clearance △X2 of the motor is as follows:

[0019] ΔX2=(A+B+C)-(a+b+c+d)(2)

[0020] Where A is the dimension from the front cover stop to the bottom of its bearing chamber. B is the dimension of the housing with the magnetic circuit ring. C is the dimension from the rear cover stop to the bottom of its bearing chamber. a is the dimension of the two bearing stops on the motor shaft. b is the thickness of bearing I. c is the thickness of the bearing retaining ring. d is the thickness of bearing II.

[0021] 7) Adjust the positions of the motor stator and rotor obtained in step 1) based on the actual required axial clearance △X4 of the motor and the axial center position deviation △X3 of the stator and rotor.

[0022] The actual deviation △X3 of the axial center position of the stator and rotor is as follows:

[0023] ΔX3=(A+B+CADE / )-(a+b+c+d+h+ΔX4-ΔX4-hbig / )(3)

[0024] In the formula, A represents the dimension from the front cover stop to the bottom of its bearing chamber. B represents the dimension of the housing with the built-in magnetic circuit ring. C represents the dimension from the rear cover stop to the bottom of its bearing chamber. D represents the dimension from the left end face of the housing with the built-in magnetic circuit ring to the left main pole screw hole. E represents the dimension between the two main pole screw holes of the housing with the built-in magnetic circuit ring. a represents the dimension of the two bearing stops on the motor shaft. b represents the thickness dimension of bearing I. c represents the thickness dimension of the bearing retaining ring. d represents the thickness dimension of bearing II. g represents the length of the armature core portion of the armature core and winding. h represents the thickness dimension of the adjusting washer. i represents the dimension between the left bearing stop of the motor shaft and the left side of the armature core and winding. ΔX4 represents the actual required axial clearance of the motor.

[0025] The actual required axial clearance △X4 of the motor is as follows:

[0026] ΔX4=(A+B+C)-(a+b+c+d+h)(4)

[0027] Where A is the dimension from the front cover stop to the bottom of its bearing chamber. B is the dimension of the housing with the magnetic circuit ring. C is the dimension from the rear cover stop to the bottom of its bearing chamber. a is the dimension of the two bearing stops on the motor shaft. b is the thickness of bearing I. c is the thickness of the bearing retaining ring. d is the thickness of bearing II. h is the thickness of the adjusting washer.

[0028] 8) In step 7), after adjusting the positions of the motor stator and rotor, assemble the rear cover.

[0029] The technical effects of the present invention are undoubted, and the present invention has the following beneficial effects:

[0030] 1) No increase in costs;

[0031] 2) Improve motor power density through refined design;

[0032] 3) Improve the consistency of motor performance parameters;

[0033] 4) Improve the compliance rate of motor indicators at critical times.

[0034] 5) The present invention takes into account the influence of the adjusting washer on the calculation of the motor dimension chain. For motors requiring axial clearance, the axial clearance △X4 actually required by the motor is obtained by adjusting the adjusting washer, which can further accurately determine the axial center position deviation △X3 of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the motor structure;

[0036] In the figure: 1 motor shaft, 2 adjusting washer, 3 bearing I, 4 front end cover, 5 housing with built-in magnetic circuit coil, 6 armature core and winding, 7 magnet, 8 main pole shoe, 9 commutator assembly, 10 rear cover, 11 bearing retaining ring, 12 bearing II, 13 rear end cover. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the following examples, but it should not be understood that the scope of the present invention is limited to the following examples. Without departing from the above technical ideas of the present invention, various substitutions and modifications can be made according to common technical knowledge and customary means in the art, and all should be included in the scope of protection of the present invention.

[0038] Example 1:

[0039] See also Figure 1 , a calculation method for optimizing the design of a motor dimension chain, comprising the following steps:

[0040] 1) The motor shaft 1, the armature core and the winding 6, and the commutator assembly 9 are assembled by electrical machining to form the rotor assembly of the motor.

[0041] In step 1, after electrical machining and assembly, the motor shaft 1, the armature core and winding 6, and the commutator assembly 9 are vacuum dipped in varnish.

[0042] 2) Assemble the bearing I3, the bearing retaining ring 11, the bearing II12 and the rotor of the motor to form the motor rotor, and obtain the axial dimensions of the motor rotor.

[0043] The axially related dimensions of the motor rotor include the dimension A from the stop of the front end cover 4 to the bottom of its bearing chamber, the dimension B of the casing 5 with the magnetic circuit ring built in, the dimension C from the stop of the rear end cover 13 to the bottom of its bearing chamber, the dimension D from the left end face of the casing 5 with the magnetic circuit ring built in to the left main pole screw hole, and the dimension E between the two main pole screw holes of the casing 5 with the magnetic circuit ring built in.

[0044] 3) Assemble the housing 5 with the magnetic circuit coil built in, the magnetic steel 7, and the main pole shoe 8 to form a stator assembly.

[0045] 4) Assemble the stator, the front cover 4, and the rear cover 13 to form the motor stator, and obtain the axial dimensions of the motor stator.

[0046] The axial-related dimensions of the motor stator include the size a of the two bearing gaps of the motor shaft 1, the thickness dimension b of the bearing I3, the thickness dimension c of the bearing retaining ring 11, the thickness dimension d of the bearing II12, the length e of the armature core part of the armature core and winding 6, the length f between the right side bearing gap of the motor shaft 1 and the left side of the armature core of the armature core and winding 6, the length g of the armature core part of the armature core and winding 6, the thickness dimension h of the adjusting washer 2, and the dimension i between the left side bearing gap of the motor shaft 1 and the left side of the armature core and winding 6.

[0047] 5) Assemble the motor rotor obtained in step 2 and the motor stator obtained in step 4 together, and calculate the theoretical axial clearance △X2 of the motor and the theoretical deviation △X1 of the axial center position of the stator and rotor.

[0048] 6) Install adjusting washer 2 and calculate the actual required axial clearance △X4 of the motor and the actual deviation △X3 of the axial center position of the stator and rotor.

[0049] The theoretical deviation △X1 of the stator and rotor axial center positions is as follows:

[0050] ΔX1=C+BDE / 2-d+c+f+eg / 2(1)

[0051] In the formula, B represents the size of the casing 5 with a built-in magnetic circuit ring. C represents the size from the stop of the rear end cover 13 to the bottom of its bearing chamber. D represents the size from the left end face of the casing 5 with a built-in magnetic circuit ring to the left main pole screw hole. E represents the size between the two main pole screw holes of the casing 5 with a built-in magnetic circuit ring. c represents the thickness of the bearing retaining ring 11. d represents the thickness of the bearing II12. e represents the length of the armature core part of the armature core and the winding 6. f represents the length between the right side bearing stop of the motor shaft 1 and the left side of the armature core of the armature core and the winding 6. g represents the length of the armature core part of the armature core and the winding 6.

[0052] The theoretical axial clearance △X2 of the motor is as follows:

[0053] ΔX2=A+B+C-a+b+c+d(2)

[0054] Where A represents the dimension from the stop of the front cover 4 to the bottom of its bearing chamber. B represents the dimension of the housing 5 containing the magnetic circuit ring. C represents the dimension from the stop of the rear cover 13 to the bottom of its bearing chamber. a represents the dimension of the two bearing stops of the motor shaft 1. b represents the thickness of the bearing I3. c represents the thickness of the bearing retaining ring 11. d represents the thickness of the bearing II12.

[0055] 7) Adjust the positions of the motor stator and rotor obtained in step 5 based on the actual required axial clearance △X4 of the motor and the axial center position deviation △X3 of the stator and rotor.

[0056] The actual deviation △X3 of the axial center position of the stator and rotor is as follows:

[0057] ΔX3=A+B+CADE / 2-a+b+c+d+h+ΔX4-ΔX4-hbig / 2(3)

[0058] In the formula, A represents the size from the stop of the front cover 4 to the bottom of its bearing chamber. B represents the size of the housing 5 with a built-in magnetic circuit ring. C represents the size from the stop of the rear cover 13 to the bottom of its bearing chamber. D represents the size from the left end face of the housing 5 with a built-in magnetic circuit ring to the left main pole screw hole. E represents the size between the two main pole screw holes of the housing 5 with a built-in magnetic circuit ring. a represents the size of the two bearing gaps of the motor shaft 1. b represents the thickness of the bearing I3. c represents the thickness of the bearing retaining ring 11. d represents the thickness of the bearing II12. g represents the length of the armature core portion of the armature core and winding 6. h represents the thickness of the adjusting washer 2. i represents the size between the left bearing gap of the motor shaft 1 and the left side of the armature core and winding 6. ΔX4 represents the actual axial clearance required by the motor. The actual axial clearance △X4 required by the motor is as follows:

[0059] ΔX4=A+B+C-a+b+c+d+h(4)

[0060] Where A represents the dimension from the stop of the front cover 4 to the bottom of its bearing chamber. B represents the dimension of the housing 5 containing the magnetic circuit ring. C represents the dimension from the stop of the rear cover 13 to the bottom of its bearing chamber. a represents the dimension of the two bearing stops of the motor shaft 1. b represents the thickness of the bearing I3. c represents the thickness of the bearing retaining ring 11. d represents the thickness of the bearing II12. h represents the thickness of the adjusting washer 2.

[0061] 8) After adjusting the positions of the motor stator and rotor obtained in step 5), assemble the rear cover 10.

[0062] Example 2:

[0063] See also Figure 1 , a calculation method for the optimization design of motor dimension chain, the main contents include:

[0064] After the motor shaft 1 is machined, it is assembled with the armature core, the winding 6 and the commutator assembly 9 through electrical machining and vacuum impregnation to form the armature or rotor of the motor.

[0065] The bearing I3, bearing retaining ring 11, and bearing II12 are assembled together with the armature or rotor after machining to form the axial dimensions of the armature or rotor of the motor.

[0066] The magnetic circuit coil housing 5, magnetic steel 7, and main pole shoe 8 are assembled after machining to form a stator assembly.

[0067] The front end cover 4 and the rear end cover 13 are machined and assembled with the stator to form the relevant axial dimensions of the motor stator.

[0068] After the armature or rotor and stator are assembled together, the relevant dimensions are calculated by design to obtain the theoretical axial clearance △X2 of the motor and the axial center position deviation △X1 of the stator and rotor.

[0069] The adjusting washer 2 is used for adjustment, and based on the theoretical axial clearance △X2 of the motor, the actual required axial clearance △X4 and the axial center position deviation △X3 of the stator and rotor are obtained through calculation.

[0070] The usual dimension chain calculation does not take into account the influence of adjusting washer 2 on the motor dimension chain calculation:

[0071] ΔX1=(C+BDE / 2)-(d+c+f+eg / 2)

[0072] ΔX2=(A+B+C)-(a+b+c+d)

[0073] ΔX3=(A+B+CADE / 2)-(a+b+c+d+h+ΔX4-ΔX4-hbig / 2)

[0074] ΔX4=(A+B+C)-(a+b+c+d+h)

[0075] The present invention takes into account the influence of the adjusting washer 2 on the calculation of the motor dimension chain. For a motor requiring an axial clearance, by adjusting the adjusting washer 2, the axial clearance △X4 actually required by the motor is obtained, and the axial center position deviation △X3 of the rotor can be further accurately determined.

Claims

1. A calculation method for optimizing the design of a motor dimension chain, characterized in that: The following steps are involved: 1) Electrically assembling the motor shaft (1), the armature core and winding (6), and the commutator assembly (9) to form a rotor assembly of the motor; 2) Assembling the bearing I (3), the bearing retaining ring (11), the bearing II (12) and the rotor of the motor to form the motor rotor, and obtaining the axial dimensions of the motor rotor; 3) Assembling the housing (5) with the magnetic circuit coil built in, the magnetic steel (7), and the main pole shoe (8) to form a stator assembly; 4) Assembling the stator, the front end cover (4), and the rear end cover (13) to form the motor stator, and obtaining the axial dimensions of the motor stator; 5) Assembling the motor rotor obtained in step 2) and the motor stator obtained in step 4) together, and calculating the theoretical axial clearance ΔX2 of the motor and the theoretical deviation ΔX1 of the axial center positions of the stator and rotor; 6) Install the adjusting washer (2) and calculate the actual required axial clearance △X4 of the motor and the actual deviation △X3 of the axial center position of the stator and rotor; 7) Adjust the positions of the motor stator and rotor obtained in step 5) based on the actual required axial clearance △X4 of the motor and the axial center position deviation △X3 of the stator and rotor.

2. The method for optimizing the design of a motor dimension chain according to claim 1, characterized in that: In step 1), after electrical machining and assembly, the motor shaft (1), the armature core and winding (6), and the commutator assembly (9) are vacuum-impregnated with paint.

3. The method for optimizing the design of a motor dimension chain according to claim 1, characterized in that: The axial dimensions of the motor rotor include a dimension A from the stop of the front end cover (4) to the bottom of its bearing chamber, a dimension B from the housing (5) with the magnetic circuit ring built in, a dimension C from the stop of the rear end cover (13) to the bottom of its bearing chamber, a dimension D from the left end face of the housing (5) with the magnetic circuit ring built in to the left main pole screw hole, and a dimension E between the two main pole screw holes of the housing (5) with the magnetic circuit ring built in.

4. The method for optimizing the design of a motor dimension chain according to claim 1, wherein: The axial dimensions of the motor stator include the dimensions a of the two bearing blocks of the motor shaft (1), the thickness dimension b of the bearing I (3), the thickness dimension c of the bearing retaining ring (11), the thickness dimension d of the bearing II (12), the length e of the armature core portion of the armature core and winding (6), the thickness dimension h of the adjusting washer (2), and the dimension i between the left side bearing block of the motor shaft (1) and the left side of the armature core and winding (6).

5. The method for optimizing the design of a motor dimension chain according to claim 1, characterized in that: The theoretical deviation △X1 of the stator and rotor axial center positions is as follows: ΔX1=(C+BDE / 2)-(d+c+f+eg / 2) (1) In the formula, B represents the size of the housing (5) with the magnetic circuit ring built in; C represents the size from the stop of the rear end cover (13) to the bottom of its bearing chamber; D represents the size from the left end face of the housing (5) with the magnetic circuit ring built in to the main pole screw hole on the left side; E represents the size between the two main pole screw holes of the housing (5) with the magnetic circuit ring built in; c represents the thickness of the bearing retaining ring (11); d represents the thickness of the bearing II (12); e represents the length of the armature core part of the armature core and winding (6); f represents the length f between the right side bearing retaining ring of the motor shaft (1) and the left side of the armature core of the armature core and winding (6); g represents the length of the armature core part of the armature core and winding (6).

6. The method for optimizing the design of a motor dimension chain according to claim 1, characterized in that: The theoretical axial clearance △X2 of the motor is as follows: ΔX2=(A+B+C)-(a+b+c+d) (2) Wherein, A represents the dimension from the stop of the front cover (4) to the bottom of its bearing chamber; B represents the dimension of the housing (5) with the magnetic circuit ring built in; C represents the dimension from the stop of the rear cover (13) to the bottom of its bearing chamber; a represents the dimension of the two bearing stops of the motor shaft (1); b represents the thickness dimension of bearing I (3); c represents the thickness dimension of the bearing retaining ring (11); and d represents the thickness dimension of bearing II (12).

7. The method for optimizing the design of a motor dimension chain according to claim 1, characterized in that: The actual deviation ΔX3 of the axial center position of the stator and rotor is as follows: ΔX3 = (A+B+CADE / 2) - (a+b+c+d+h+ΔX4 - ΔX4 - hbig / 2) (3) In the formula, A represents the size from the stop of the front cover (4) to the bottom of its bearing chamber; B represents the size of the housing (5) with the magnetic circuit ring built in; C represents the size from the stop of the rear cover (13) to the bottom of its bearing chamber; D represents the size from the left end face of the housing (5) with the magnetic circuit ring built in to the left main pole screw hole; E represents the size between the two main pole screw holes of the housing (5) with the magnetic circuit ring built in; a represents the size of the two bearing blocks of the motor shaft (1); b represents the thickness of bearing I (3); c represents the thickness of bearing retaining ring (11); d represents the thickness of bearing II (12); g represents the length of the armature core portion of the armature core and winding (6); h represents the thickness of the adjusting washer (2); i represents the size between the left bearing block of the motor shaft (1) and the left side of the armature core and winding (6); ΔX4 represents the actual required axial clearance of the motor.

8. The method for optimizing the design of a motor dimension chain according to claim 1, characterized in that: The actual required axial clearance △X4 of the motor is as follows: ΔX4=(A+B+C)-(a+b+c+d+h) (4) Wherein, A represents the dimension from the stop of the front cover (4) to the bottom of its bearing chamber; B represents the dimension of the housing (5) with the magnetic circuit ring built in; C represents the dimension from the stop of the rear cover (13) to the bottom of its bearing chamber; a represents the dimension of the two bearing blocks of the motor shaft (1); b represents the thickness dimension of bearing I (3); c represents the thickness dimension of bearing retaining ring (11); d represents the thickness dimension of bearing II (12); and h represents the thickness dimension of adjusting washer (2).

9. The method for optimizing the design of a motor dimension chain according to claim 1, characterized in that: In step 7), after adjusting the positions of the motor stator and rotor, the rear cover (10) is assembled.

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