CN102064644A - Thin disc rotor type AC asynchronous motor - Google Patents

Abstract

The invention discloses a thin disc rotor type AC synchronous motor, which comprises a rotary shaft, a front end cover, a base shell, a rear end cover, an encoder, an electromagnetic coil and a thin disc rotor. The thin metal disc with high electrical conductivity is used as the rotor, and exciting windings are added to the two sides of the rotor so as to realize brushless motor; the motor maintains the performance of approximately linear original torque property, small rotary inertia, quick reaction, stable operation and the like, the service life of the motor is greatly prolonged, the motor structure is simplified, the control performance of the motor is improved, and the application range is widened.

Description

A Thin Disk Rotor Type AC Asynchronous Motor

technical field

The invention relates to an AC asynchronous motor, in particular to a thin disk rotor type AC asynchronous motor.

Background technique

At present, the common motor with thin disk rotor is printed winding motor, because the moment of inertia of the thin disk rotor of the printed winding motor is small, the response is fast, the operation is stable, and the axial size is small, so this flat motor It is widely used in places with narrow space dimensions, but because the rotor of the printed winding motor must adopt a carbon brush commutation structure, the structure of the printed winding motor is very complicated, and the carbon brush commutation structure makes the use of the printed winding motor The service life is greatly reduced, therefore, this type of motor is subject to relatively large restrictions on rotation control and use environment.

Contents of the invention

The object of the present invention is to provide a thin disk rotor type AC asynchronous motor in order to overcome the shortcomings of the existing printed winding motor.

The technical scheme adopted in the present invention is: the thin disk rotor type AC asynchronous motor includes a rotating shaft, a front end cover, a base shell, a rear end cover, an encoder, an electromagnetic coil, and a thin disk rotor; The front-end cover shell and the electromagnetic pole arranged inside the front-end cover shell are composed of a cavity for placing the front electromagnetic coil on the side of the front-end cover facing the thin disk-shaped rotor, and the holes for fixing the front electromagnetic coil are evenly distributed in the cavity. The magnetically conductive electromagnetic poles formed integrally with the front end cover shell, the number of electromagnetic poles is four or more. The outer shape and size of the rear end cover and the front end cover are the same. The rear end cover is composed of a circular or regular polygonal rear end cover shell and an electromagnetic pole arranged inside the rear end cover shell, facing the thin disc rotor on the rear end cover. There is a cavity for placing the rear electromagnetic coil on one side of the cavity, and the magnetically conductive electromagnetic poles used to fix the rear electromagnetic coil and the rear end cover shell are evenly distributed in the cavity, and the number of electromagnetic poles is four or four above. On the side of the center of the front end cover and the rear end cover facing the thin disk rotor, there is a bearing seat for fixing the bearing. Several threaded holes are evenly distributed on the front end cover and the rear end cover. Through these threaded holes, the front end cover and the rear end cover The end cover is fixed on the base shell with long screws. The shape of the thin disk rotor is a thin disk, made of metal; the wall thickness of the thin disk rotor is between 0.01 and 5mm, and the center of the thin disk rotor is provided with a bushing with a central hole. The center hole of the shaft sleeve is tightly set on the rotating shaft, and two bearings are respectively installed on both sides of the thin disk rotor on the rotating shaft. The outer rings of the two bearings are fixed in the bearing seats of the front end cover and the rear end cover. There is a central hole in the center of the cover and the rear end cover, the output end of the rotating shaft protrudes from the central hole of the front end cover, the other end of the rotating shaft protrudes from the central hole of the rear end cover, and the output end of the rotating shaft protrudes from the central hole of the rear end cover. There are threaded holes and positioning slots on the shaft end of the rotating shaft protruding from the center. The encoder is composed of an encoder housing and an encoding disc for measuring the rotational speed or rotation angle. The encoding disc is fixed on the positioning slot of the rotating shaft through the threaded hole with screws. , The encoder shell is fixed on the rear end cover with screws to protect the encoder disc in the encoder shell.

Before work, connect (or connect in series) the two opposite front electromagnetic coils on the front end cover and the two opposite rear electromagnetic coils on the same position on the rear end cover as the working magnetic poles, so that the four The electromagnetic field generated by each electromagnetic pole forms a closed-loop magnetic field flow through the magnetic conduction of the front end cover and the rear end cover, and then parallel (or serial connection) the other two front electromagnetic coils on the front end cover and the same position on the rear end cover The other two rear electromagnetic coils are used as control magnetic poles, so that the electromagnetic field generated by these four electromagnetic poles forms a closed-loop magnetic field flow through the magnetic conduction of the front end cover and the rear end cover. The two closed-loop magnetic field flows follow the axis of the shaft The center lines are perpendicular to each other; when working, a symmetrical voltage with equal amplitude and a phase difference of 90° electrical angle is applied to the working magnetic pole and the control magnetic pole respectively, then a circular rotating magnetic field is generated in the air gap of the motor, and the rotating magnetic field is thin The induced current is generated in the disk rotor, and the current is forced in the magnetic field to make the thin disk rotor rotate. If the voltage amplitude or phase electrical angle of the control pole is changed, the generated magnetic field will be an elliptical rotating magnetic field, so changing the control signal, the ellipticity of the magnetic field can be changed to control the speed of the motor. When there is no control voltage or the phase electrical angle is zero, the thin disc rotor is only affected by the pulsating magnetic field, and the thin disc rotor is stationary. When the control voltage The thin disc rotor will reverse direction when the phase of the rotor is reversed.

The invention adopts a thin metal disc with good conductivity as the rotor, and installs excitation windings on both sides of the rotor to make the motor brushless. The motor maintains the original torque characteristic close to linear, the moment of inertia is small, and the response is fast. While running smoothly and other performances, the service life of the motor is greatly improved, the structure of the motor is simplified, the control performance of the motor is improved, and the application range is broadened.

Description of drawings

Fig. 1 is a schematic diagram of the external structure of an AC asynchronous motor according to an embodiment of the present invention.

Fig. 2 is a structural sectional view of an AC asynchronous motor according to an embodiment of the present invention.

Fig. 3 is an exploded schematic view of the structure of an AC asynchronous motor according to an embodiment of the present invention.

Fig. 4 is an exploded schematic diagram of a front end cover or a rear end cover of an AC asynchronous motor according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a thin disk rotor of an AC asynchronous motor according to an embodiment of the present invention.

Marks in the figure: 1. Shaft, 1-1. Shaft sleeve, 1-2. Thin disc rotor, 1-3. Threaded hole, 1-4. Positioning groove, 2. Front end cover, 2-1. Front end cover shell , 2-2. Front electromagnetic coil, 2-3. Electromagnetic pole, 2-4. Front bearing, 3. Base shell, 4. Rear end cover, 4-1. Rear end cover shell, 4-2. Rear electromagnetic Coil, 4-4. Rear bearing, 5. Encoder, 5-1. Encoder shell, 5-2. Encoder disk, 5-3. Screw, 6. Long screw.

Detailed ways

Example:

As shown in Fig. 1, Fig. 2 and Fig. 3, the thin disk rotor type AC asynchronous motor includes a rotating shaft 1, a front cover 2, a front electromagnetic coil 2-2, a frame shell 3, a rear end cover 4, and a rear electromagnetic coil 4 -2, encoder 5, thin disk rotor 1-2; On the side facing the thin disk-shaped rotor 1-2, there is a cavity for placing the front electromagnetic coil 2-2. In the cavity, holes for fixing the front electromagnetic coil 2-2 and the front end cover shell 2-1 are evenly distributed. There are four electromagnetic poles 2-3 for magnetic conduction. The external shape and size of rear end cover 4 and front end cover 2 are identical, and rear end cover 4 is made up of circular rear end cover shell 4-1 and the electromagnetic pole 2-3 that is located at rear end cover shell 4-1 inner side, in A cavity for placing the rear electromagnetic coil 4-2 is provided on the side of the rear end cover facing the thin disk-shaped rotor 1-2, and the cavity for fixing the rear electromagnetic coil 4-2 and the rear end cover shell 4-2 are evenly distributed in the cavity. 1 Generate integrated magnetically conductive electromagnetic poles 2-3, and the number of electromagnetic poles 2-3 is four. The center of the front end cover 2 and the rear end cover 4 is provided with a bearing seat for fixing the front bearing 2-4 and the rear bearing 4-4 towards the side of the thin disk rotor 1-2, and the front end cover 2 and the rear end cover 4 There are 4 threaded holes evenly distributed on the top, through these threaded holes, the front end cover 2 and the rear end cover 4 are fixed on the base shell 3 with long screws 6 . The shape of the thin disk rotor 1-2 is a thin disk, made of metal; the wall thickness of the thin disk rotor 1-2 is 0.5mm, and the center of the thin disk rotor 1-2 is provided with a The shaft sleeve 1-1 of the central hole, the central hole of the shaft sleeve 1-1 is tightly sleeved on the rotating shaft 1, and the front bearing 2-4 and the rear bearing 2-4 are respectively installed on the rotating shaft 1 on both sides of the thin disc rotor 1-2. Bearing 4-4, the outer rings of front bearing 2-4 and rear bearing 4-4 are fixed in the bearing seats of front end cover 2 and rear end cover 4, and the center positions of front end cover 2 and rear end cover 4 are all provided with central holes , the output end of the rotating shaft 1 protrudes from the central hole of the front end cover 2, the other end of the rotating shaft 1 protrudes from the central hole of the rear end cover 4, and the shaft of the rotating shaft 1 protruding from the central hole of the rear end cover 4 There are threaded holes 1-3 and positioning slots 1-4 at the end, and the encoder 5 is composed of an encoder housing 5-1 and an encoder disc 5-2 for measuring the rotational speed or rotation angle, and the encoder disc 5-2 is screwed with a screw 5 -3 is fixed on the positioning groove 1-4 of the rotating shaft 1 through the threaded hole 1-3, and the encoder housing 5-1 is fixed on the rear end cover 4 with a long screw 6 to protect the encoder disc 5-2 on the encoder housing 5- within 1.

Before work, connect two opposite front electromagnetic coils 2-2 on the front end cover 2 and two opposite rear electromagnetic coils 4-2 on the same position on the rear end cover 4 as working magnetic poles. Make the electromagnetic field produced by these four electromagnetic poles form a closed-loop magnetic field flow through the magnetic conduction effect of the front end cover 2 and the rear end cover 4, and then connect the other two front electromagnetic coils 2-2 on the front end cover 2 and the rear end cover 4, the other two rear electromagnetic coils 4-2 at the same position are used as control magnetic poles, so that the electromagnetic field generated by these four electromagnetic poles forms a closed-loop magnetic field flow through the magnetic conduction of the front end cover 2 and the rear end cover 4, which The two closed-loop magnetic field flows are perpendicular to each other with the axis of the rotating shaft 1 as the center line; when working, a symmetrical alternating current with equal amplitude and a phase difference of 90° electrical angle is added to the working magnetic pole and the control magnetic pole respectively, and the air gap of the motor A ring-shaped rotating magnetic field is generated in the center, and the rotating magnetic field generates an induced current in the thin disc rotor 1-2, and the current is forced in the magnetic field to make the thin disc rotor 1-2 rotate. If the voltage amplitude or phase voltage of the control pole is changed Angle, the generated magnetic field will be an elliptical rotating magnetic field, so changing the control signal can change the ellipticity of the magnetic field, thereby controlling the speed of the motor. When there is no control voltage or the phase electrical angle is zero, the thin disc rotor 1 -2 is only affected by the pulsating magnetic field, the thin disc rotor 1-2 is stationary, and when the phase of the control voltage is opposite, the thin disc rotor 1-2 will reverse.

Claims (1)

1. AC asynchronous motor, comprise rotating shaft (1), front end housing (2), support shell (3), rear end cap (4), encoder (5), it is characterized in that front end housing (2) is by the front end housing shell (2-1) of circle or regular polygon be located at the inboard electromagnetic pole (2-3) of front end housing shell (2-1) and form, go up the cavity of solenoid (2-2) before a side of thin disk type rotor (1-2) is provided with placement at front end housing (2), be evenly distributed with in the cavity be used for fixing preceding solenoid (2-2) and front end housing shell (2-1) generate the electromagnetic pole (2-3) of the magnetic conduction of one, the number of electromagnetic pole (2-3) is four or more; The external shape of rear end cap (4) and front end housing (2) and measure-alike, rear end cap (4) is by the rear end cap shell (4-1) of circle or regular polygon and be located at the inboard electromagnetic pole (2-3) of rear end cap shell (4-1) and form, side towards thin disk type rotor (1-2) on rear end cap is provided with the cavity of placing back solenoid (4-2), be evenly distributed with the electromagnetic pole (2-3) of magnetic conduction solenoid (4-2) and rear end cap shell (4-1) generation one after being used for fixing in the cavity, the number of electromagnetic pole (2-3) is four or more; Center at front end housing (2) and rear end cap (4) is provided with the bearing pedestal that is used for fixing fore bearing (2-4) and rear bearing (4-4) towards a side of thin disk type rotor (1-2), on front end housing (2) and rear end cap (4), be evenly distributed with several screwed holes, by these screwed holes, front end housing (2) and rear end cap (4) are fixed on the support shell (3) with long spiro nail (6); The shape of thin disk type rotor (1-2) is thin discoidal, is made of metal; The wall thickness of thin disk type rotor (1-2) is between 0.01-5mm; the center of thin disk type rotor (1-2) is provided with an axle sleeve (1-1) that has centre bore; the centre bore of axle sleeve (1-1) securely is enclosed within the rotating shaft (1); rotating shaft (1) is gone up in the both sides of thin disk type rotor (1-2) fore bearing (2-4) and rear bearing (4-4) is housed respectively; the outer ring of fore bearing (2-4) and rear bearing (4-4) is fixed in the bearing pedestal of front end housing (2) and rear end cap (4); the center of front end housing (2) and rear end cap (4) all has centre bore; the output of rotating shaft (1) stretches out from the centre bore of front end housing (2); the other end of rotating shaft (1) stretches out from the centre bore of rear end cap (4); the axle head of the rotating shaft of stretching out from the centre bore of rear end cap (4) (1) has screwed hole (1-3) and location notch (1-4); encoder (5) by encoder shell (5-1) and the coding disk (5-2) that is used to survey rotating speed or surveys corner form; coding disk (5-2) is fixed on by screwed hole (1-3) on the location notch (1-4) of rotating shaft (1) with screw (5-3), and encoder shell (5-1) is fixed on rear end cap (4) with long spiro nail (6) and goes up coding disk (5-2) protection in encoder shell (5-1).

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