TWI682621B - Resolver fixing mechanism and its motor - Google Patents

Abstract

A resolver fixing mechanism is applied to a motor, and includes a bottom case, a resolver stator, and a magnetically conductive cover plate. The bottom case has a support portion and a flange portion; the support portion has a perforation penetrating through the central axis, the flange portion extends from the support portion, and the flange portion has a protruding base. The resolver stator is fixed to the base. The magnetically conductive cover plate has a fixing portion and a shielding portion. The fixed part is fixed between the resolver stator and the base, and a non-magnetic conducting pad is provided between the resolver stator and the fixed part. The shielding portion extends from the fixed portion and extends toward the central axis. With the shielding part, the magnetic field lines of the coil are prevented from converging to the resolver assembly, thereby reducing the probability of error in the resolver signal.

Description

Resolver fixing mechanism and its motor

The invention relates to a resolver of a motor, in particular to a fixer and a motor of the resolver.

When the motor of an electric car or an electric car is running, the system needs to accurately grasp the output state of the motor, especially the motor speed, in order to ensure the normal operation of the motor and issue the correct control commands.

The speed of the motor is detected by the resolver. The rotor and stator of the resolver are usually set in the motor housing. The stator is fixed to the housing, and the rotor is fixed to the mandrel or the motor rotor. However, both the motor rotor and the motor stator generate strong magnetic fields. The output signal of the resolver is a sine wave signal. This sine wave signal is susceptible to interference from strong magnetic fields and causes distortion with noise. Once the sine wave signal is distorted, the system will judge that the motor is operating incorrectly, and force the motor to shut down. If the motor is shut down due to an error while the car is driving, the car will temporarily lose power and may be dangerous.

In view of the above problems, the present invention provides a resolver fixing mechanism, which is applied to a motor. The resolver fixing mechanism can prevent the resolver from being disturbed by the magnetic field change generated during the operation of the motor, and prevent the system from powering off and shutting down the motor due to an error signal in the motor speed detection operation.

The invention provides a resolver fixing mechanism, which comprises a bottom shell, a resolver stator and a magnetically conductive cover plate. The bottom case has a support portion and a flange portion; the support portion has a through hole penetrating through the central axis, the flange portion extends from the support portion, and the flange portion has a protruding base. The resolver stator is fixed to the base. The magnetically conductive cover plate has a fixing portion and a shielding portion; wherein the fixing portion is fixed between the resolver stator and the base, and a non-magnetically conductive gasket is provided between the resolver stator and the fixing portion; wherein, the shielding portion It extends from the fixed part and extends towards the central axis.

Based on the above resolver fixing mechanism, the present invention provides a motor including the resolver fixing mechanism, the motor stator, the mandrel, the motor rotor, and the resolver rotor as described above. The motor stator has a coil fixing frame and a plurality of coils; the coil fixing frame has an annular winding slot, and the plurality of coils are fixed to the coil fixing frame in a concentrated winding manner. The mandrel passes through the support. The motor rotor is arranged on the mandrel and is located in the annular winding groove. The resolver rotor is fixed to the motor rotor; wherein, the distance of the resolver stator relative to the central axis is greater than the distance of the resolver rotor compared to the central axis, and the shield is shielded between the bottom case and the resolver rotor.

The invention also provides a resolver fixing mechanism, which includes a bottom shell, a resolver stator and a magnetic isolation ring. The bottom case has a support portion and a flange portion; the support portion has a through hole penetrating through the central axis, the flange portion extends from the support portion, and the flange portion has a protruding base. The resolver stator is fixed to the base. A wall surface of the magnetic isolation ring is located outside the resolver stator.

Based on the above resolver fixing mechanism, the present invention further proposes a motor including the resolver fixing mechanism, the motor stator, the mandrel, the motor rotor, and the resolver rotor as described above. The motor stator has a coil fixing frame and a plurality of coils; the coil fixing frame has an annular winding groove, and the plurality of coils are fixed to the coil fixing frame in a concentrated winding manner. The mandrel passes through the support. The motor rotor is arranged on the mandrel and is located in the annular winding groove. The resolver rotor is fixed to the motor rotor; wherein, the distance of the resolver stator relative to the central axis is greater than the distance of the resolver rotor compared to the central axis, and the shield is shielded between the bottom case and the resolver rotor.

The invention does not change the configuration of the resolver stator and resolver rotor, nor does it modify the structure of the existing motor, but uses the method of adding a magnetically conductive cover plate or a magnetic isolation ring to prevent the magnetic field lines of the coil from converging to the resolver stator Or resolver rotor, and avoid signal interference of the resolver stator or resolver rotor by the coil. Therefore, the fixing structure of the resolver can be quickly integrated into the existing motor design without redesigning the motor structure.

Please refer to FIG. 1, FIG. 2 and FIG. 3, which is a fixing mechanism of a resolver disclosed in the first embodiment of the present invention, which is applied to a motor 100. The motor 100 has a bottom case 110, a motor stator 120, a spindle 130, a motor rotor 140, a resolver assembly, and a magnetically conductive cover plate 160.

As shown in FIGS. 1 and 2, the bottom case 110 has a support portion 112 and a flange portion 114. The support portion 112 is columnar, and has a through hole 116 penetrating a central axis L. The mandrel 130 is inserted into the support portion 112 through the through hole 116. The flange portion 114 extends from the support portion 112 to form a disc-shaped structure.

As shown in FIGS. 1, 2 and 3, the motor stator 120 has a coil fixing frame 122 and a plurality of coils 124. The coil fixing frame 122 is ring-shaped, and has a ring-shaped winding groove 126. The plurality of coils 124 are fixed to the coil fixing frame 122 in a concentrated winding manner. The winding axis of the coil 124 is perpendicular to the central axis L of the annular winding groove 126. The multiple coils 124 are arranged at intervals to provide alternating magnetic fields.

As shown in FIGS. 1 and 2, in a specific embodiment, the motor rotor 140 has a rotor bushing 144. The rotor bushing 144 includes an annular side wall 142 structure and a reduction gear section 145 structure. The annular side wall 142 And the reduction gear section 145 is integrally formed on the rotor bush 144. The annular side wall 142 structure is disposed around the rotor bushing 144. The reduction gear segment 145 extends from the rotor bushing 144 or the reduction gear segment 145 is formed on the outer surface of the rotor bushing 144 so that the reduction gear segment 145 is coupled to the rotor bushing 144. The overall structure of the motor rotor 140 is that the rotor bush 144 is movably sleeved on the mandrel 130, and is positioned in the axial direction of the mandrel 130 through the straight stop surface on the reduction gear section 145, so that the motor rotor 140 is rotatably disposed on the mandrel 130.

As shown in FIGS. 1 and 2, the outer circumferential surface of the annular side wall 142 is provided with a plurality of permanent magnetic elements 146, and the permanent magnetic elements 146 are arranged on the outer circumferential surface at intervals. The aforementioned reduction gear section 145 is used to be coupled to a reduction gear assembly, so as to output the power generated by the rotation of the motor rotor 140.

As shown in FIGS. 2, 3 and 4, the resolver assembly includes a resolver rotor 152 and a resolver stator 154. In FIG. 3, the reduction gear section 145 and the mandrel 130 are not shown to simplify the illustration. The resolver rotor 152 is fixed to the rotor bush 144 and thus to the motor rotor 140 so that the resolver rotor 152 and the motor rotor 140 can rotate simultaneously. The resolver rotor 152 may also be fixed to other parts of the motor rotor 140 as long as the resolver rotor 152 and the motor rotor 140 can rotate simultaneously. In addition, the rotor bushing 144 isolates the side of the motor rotor 140 facing the bottom case 110 into a receiving portion 148, and the resolver stator 154 and the resolver rotor 152 are located in the receiving portion 148.

As shown in FIGS. 2, 3 and 4, the resolver stator 154 is fixed to the flange portion 114 of the bottom case 110. The flange portion 114 has a base 118 protruding toward the motor rotor 140, and the resolver stator 154 is fixed to the base 118 by fixing means such as bolts.

As shown in FIG. 4, the distance of the resolver stator 154 relative to the central axis L is greater than the distance of the resolver rotor 152 compared to the central axis L. A specific embodiment of the resolver assembly is a Hall sensor. The resolver rotor 152 can pass through the side of the resolver stator 154 once for each turn around the central axis L, which can produce a Hall induction effect (Hall effect). The rotation speed of the motor rotor 140 (that is, the rotation speed of the motor 100) can be obtained through the Hall effect. The resolver assembly is not excluded from other forms of detection mechanisms, as long as the resolver stator 154 and resolver rotor 152 are used as the signal transmitter and the signal receiver, respectively.

As shown in FIGS. 3 and 4, the magnetically conductive cover plate 160 has a fixing portion 162 and a shielding portion 164. The fixed portion 162 is fixed between the resolver stator 154 and the base 118, and a non-magnetically conductive gasket 166 is provided between the resolver stator 154 and the fixed portion 162 so that the magnetic force lines passing through the magnetically conductive cover plate 160 will not directly pass through The fixed portion 162 enters the resolver stator 154. The shielding portion 164 extends from the fixing portion 162 and extends toward the central axis L, covers the accommodating portion 148, and shields between the bottom case 110 and the resolver rotor 152. In addition, the outer periphery of the shielding portion 164 has an extending portion that extends on the outer side of the resolver stator 154 and is isolated between the resolver stator 154 and the annular side wall 142 of the motor rotor 140. A specific embodiment of the magnetically conductive cover plate 160 may be a cold-pressed steel plate, for example, a steel plate conforming to the JIS 3141-1996 standard. A specific embodiment of the non-magnetic conductive gasket 166 is bakelite or other plastic materials.

As shown in FIG. 4, the coil 124 is located outside the resolver stator 154 (not shown in the figure). When the magnetic field changes due to the action of the coil 124, the magnetic field lines of the coil 124 will be attracted by the magnetically conductive cover plate 160 and converge to the magnetically conductive cover plate 160 to reduce the magnetic field line density passing through the resolver stator 154 or resolver rotor 152. Therefore, the signal transmission and reception of the resolver stator 154 or resolver rotor 152 is prevented from being interfered, and the problem of incorrect detection of the rotation speed of the motor 100 is further avoided.

As shown in FIGS. 5 and 6, it is a fixing mechanism of a resolver disclosed in the second embodiment of the present invention, which is applied to a motor 100. The motor 100 has a bottom case 110, a motor stator 120, a mandrel 130, a motor rotor 140, a resolver assembly and a magnetic isolation ring 170.

As shown in FIGS. 5 and 6, the difference between the second embodiment and the first embodiment is that the motor 100 of the second embodiment is not provided with a magnetically conductive cover plate 160 and a magnetic isolation ring 170 is added. As shown in the figure, the magnetic isolation ring 170 is made of a non-magnetic conductive material, such as stainless steel, to isolate the passage of magnetic force lines. In a specific embodiment, the stainless steel is in accordance with JIS G4303:2005.

As shown in FIGS. 5 and 6, the magnetic isolation ring 170 is fixed to the outer side of the resolver stator 154; in a specific embodiment, the outer ring portion of the resolver stator 154 is cut to be used for combining magnetic isolation Ring 170. However, in practice, the magnetic isolation ring 170 only needs to be located outside the resolver stator 154, and the permanent magnet element 146 and the coil 124 can be radially isolated from the resolver stator 154. Therefore, the magnetic isolation ring 170 may be fixed to the motor rotor 140 or to the rotor bush 144 of the motor rotor 140.

As shown in the figure, in another specific embodiment, the magnetic isolation ring 170 is fixed to the inner side of the annular side wall 142 to form a state of being fitted to the annular side wall 142.

When the magnetic field changes due to the action of the coil 124, the magnetic field lines of the coil 124 will be blocked by the magnetic isolation ring 170 and diverge toward both ends of the central axis L to prevent the magnetic field lines from converging to the resolver stator 154 or resolver rotor 152, reducing The magnetic flux density of the resolver stator 154 or resolver rotor 152 prevents the signal transmission and reception of the resolver stator 154 or resolver rotor 152 from being disturbed by the magnetic force lines, and further avoids the problem of incorrect detection of the rotation speed of the motor 100.

Please refer to FIG. 7 and FIG. 8, which is a fixing mechanism for a resolver disclosed in the third embodiment of the present invention, which is applied to a motor 100. The motor 100 has a bottom case 110, a motor stator 120, a mandrel 130, a motor rotor 140, a resolver assembly, a magnetically conductive cover plate 160 and a magnetic isolation ring 170.

As shown in FIGS. 7 and 8, the third embodiment mainly combines the magnetically conductive cover plate 160 of the first embodiment and the magnetic isolation ring 170 of the second embodiment in the same motor 100. Therefore, when the magnetic field changes due to the action of the coil 124, the magnetic field lines of the coil 124 will be blocked by the magnetic isolation ring 170 and diverge toward both ends of the central axis L, to prevent the magnetic field lines from converging to the resolver stator 154 or resolver rotor 152; The magnetic force lines still converging toward the resolver stator 154 or resolver rotor 152 are attracted by the magnetically conductive cover plate 160 and converge to the magnetically conductive cover plate 160; therefore, the magnetically conductive cover plate 160 and the magnetic isolation ring 170 are arranged at the same time , Can more effectively reduce the magnetic line density through the resolver stator 154 or resolver rotor 152, thereby avoiding interference of the signal transmission and reception of the resolver stator 154 or resolver rotor 152, and further avoiding the detection error of the motor 100 speed The problem occurs.

The present invention does not change the configuration of the resolver stator 154 and resolver rotor 152, nor does it modify the structure of the existing motor 100. Instead, the magnetic flux lines of the coil 124 are avoided by adding a magnetically conductive cover plate 160 or a magnetic isolation ring 170. It converges on the resolver stator 154 or resolver rotor 152 to avoid interference of the signal transmission and reception of the resolver stator 154 or resolver rotor 152. Therefore, the fixing structure of the resolver can be quickly integrated into the existing motor 100 design without redesigning the motor 100 structure.

100‧‧‧Motor

110‧‧‧Bottom shell

112‧‧‧Support

114‧‧‧Flange

116‧‧‧Through hole

118‧‧‧Dock

120‧‧‧Motor stator

122‧‧‧coil fixing frame

124‧‧‧coil

126‧‧‧ring winding groove

130‧‧‧mandrel

140‧‧‧Motor rotor

142‧‧‧Annular side wall

144‧‧‧Rotor bushing

145‧‧‧Reduction gear section

146‧‧‧Permanent magnet components

148‧‧‧Accommodation Department

152‧‧‧Resolver rotor

154‧‧‧Resolver stator

160‧‧‧Magnetic cover

162‧‧‧Fixed Department

164‧‧‧Shading Department

166‧‧‧Non-magnetic conductive gasket

170‧‧‧Magnetic isolation ring

L‧‧‧ Central axis

FIG. 1 is a perspective view of a resolver fixing mechanism and its motor according to the first embodiment of the present invention. Fig. 2 is an exploded view of the resolver fixing mechanism and its motor according to the first embodiment of the present invention. 3 is a schematic cross-sectional view of a resolver fixing mechanism and its motor according to the first embodiment of the present invention. 4 is a schematic cross-sectional view of some elements in the resolver fixing mechanism of the first embodiment of the present invention. 5 is an exploded view of the resolver fixing mechanism and its motor in the second embodiment of the present invention. 6 is a schematic cross-sectional view of some elements in the resolver fixing mechanism of the second embodiment of the present invention. 7 is an exploded view of a resolver fixing mechanism and its motor in a third embodiment of the invention. 8 is a schematic cross-sectional view of some elements in the resolver fixing mechanism of the third embodiment of the present invention.

118‧‧‧Dock

124‧‧‧coil

146‧‧‧Permanent magnet components

152‧‧‧Resolver turn

154‧‧‧Resolver stator

160‧‧‧Magnetic cover

162‧‧‧Fixed Department

164‧‧‧Shading Department

166‧‧‧Non-magnetic conductive gasket

170‧‧‧Magnetic isolation ring

L‧‧‧Axis

Claims (17)

A resolver fixing mechanism includes: a bottom case with a support portion and a flange portion; the support portion has a perforation penetrating through a central axis, the flange portion extends from the support portion, and the flange The part has a protruding base; a resolver stator fixed to the base; and a magnetically conductive cover plate having a fixed part and a shielding part; wherein the fixed part is fixed to the resolver stator and the Between the base, and a non-magnetic gasket is provided between the resolver stator and the fixing portion; wherein the shielding portion extends from the fixing portion and extends toward the central axis, and the outer periphery of the shielding portion It has an extension that extends on the outer side of the resolver stator. The resolver fixing mechanism according to claim 1, further comprising a magnetic isolation ring, and a wall surface position of the magnetic isolation ring is located outside the stator of the resolver. The resolver fixing mechanism according to claim 1, wherein the non-magnetically conductive gasket is made of bakelite or plastic material. A motor comprising: a resolver fixing mechanism as described in claim 1 or claim 2; a motor stator having a coil fixing frame and a plurality of coils; the coil fixing frame has an annular winding groove, and the A plurality of coils are fixed to the coil fixing frame in a concentrated winding manner; a mandrel penetrates the support portion; a motor rotor is provided on the mandrel and is located in the annular winding groove; and a resolver The rotor is fixed to the motor rotor; wherein the distance of the resolver stator relative to the central axis is greater than the distance of the resolver rotor compared to the central axis, and the shielding portion shields the bottom case and the solution Protractor between rotors. The motor according to claim 4, wherein the winding axis of each of the coils is perpendicular to the central axis, and the plurality of coils are arranged at intervals. The motor according to claim 4, wherein the motor rotor has a rotor bushing and a reduction gear section, and the reduction gear section is coupled to the rotor bushing. The motor according to claim 6, wherein the resolver rotor is fixed to the rotor bushing and thus to the motor rotor. The motor according to claim 6, wherein the rotor bush has an annular side wall disposed around the rotor bush. The motor according to claim 8, wherein a plurality of permanent magnetic elements are provided on the outer circumferential surface of the annular side wall, and the plurality of permanent magnetic elements are provided on the outer circumferential surface at intervals. A motor includes: a bottom case with a support portion and a flange portion; the support portion has a perforation penetrating through a central axis, the flange portion extends from the support portion, and the flange portion has a protruding A base; a resolver stator, fixed to the base; a magnetic isolation ring, wherein a wall surface position of the magnetic isolation ring is located outside the resolver stator; a motor stator has a coil fixing frame and A plurality of coils; the coil fixing frame has an annular winding groove, and the plurality of coils are fixed to the coil fixing frame in a concentrated winding manner; a mandrel is inserted through the support portion; and a motor rotor is arranged on the core On the shaft and located in the annular winding groove, and the motor rotor has a rotor bush and a reduction gear segment, the reduction gear segment is coupled to the rotor bush; and A resolver rotor is fixed to the motor rotor; wherein, the distance of the resolver stator relative to the central axis is greater than the distance of the resolver rotor compared to the central axis. The motor according to claim 10, wherein the magnetic isolation ring is made of a non-magnetic conductive material. The motor according to claim 10, wherein the winding axis of each coil is perpendicular to the central axis, and the plurality of coils are arranged at intervals. The motor according to claim 10, wherein the resolver rotor is fixed to the rotor bushing and thus to the motor rotor. The motor according to claim 10, wherein the rotor bushing has an annular side wall and is disposed around the rotor bushing. The motor according to claim 14, wherein a plurality of permanent magnetic elements are provided on the outer circumferential surface of the annular side wall, and the plurality of permanent magnetic elements are provided on the outer circumferential surface at intervals. The motor according to claim 14, wherein the magnetic isolation ring is located between the resolver stator and the annular side wall. The motor according to claim 16, wherein the magnetic isolation ring is fixed to the motor rotor.

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