Brushless motor

Abstract

The utility model discloses a brushless motor, which comprises a shell, and a stator, a rotor and a rotating shaft which are arranged in the shell, a circuit board is arranged in the shell, a limiting part is arranged between the circuit board and the stator, and the circuit board is buckled at the upper end of the stator through the limiting part; a plurality of magnetic induction elements are arranged on the circuit board, a guide plug is further arranged on the circuit board, the motor is electrified to enable the coil winding on the stator to generate a magnetic field, and signals are transmitted to the magnetic induction elements on the circuit board through the conductive plug, so that the circuit board regulates and controls the rotating speed of the motor; a magnetic induction ring is arranged in the shell, the magnetic induction ring is arranged on the rotating shaft in a sleeving mode, and the magnetic induction ring is additionally arranged, so that the detection accuracy of the conductive plug is further improved, errors are smaller, and the rotating speed of the motor is controlled more accurately.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a brushless motor. Background Art

[0002] Motors, a type of equipment that converts electrical energy into mechanical energy, are widely used in our daily lives, such as electric vehicles, cutting machines, fans, etc. Motors are usually composed of a rotor, a stator, and a rotating shaft. The stator of the motor is usually wound with enameled wire, and a magnetic steel is usually provided on the rotor. The magnetic field is generated by passing electricity through the copper wire, and the magnetic steel and the magnetic field are induced to make the rotor rotate, thereby converting electrical energy into mechanical energy.

[0003] Motors include brushless motors and brushed motors. Compared with brushed motors, brushless motors remove brushes and use semiconductor switching devices to achieve electronic commutation, that is, electronic switching devices replace traditional contact commutators and brushes. Hall induction magnetic rings are often used in brushless motors. Their working principle is to rely on the induction of multiple magnetic poles of the magnetic ring with the Hall element in order to test the speed and efficiency of the motor, and can control the operation of the motor according to the signal provided by the Hall induction magnetic ring.

[0004] The existing brushless motors have a relatively general accuracy and are unable to control the motor speed more accurately. Utility Model Content

[0005] The utility model aims to provide a brushless motor in view of the defects of the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a brushless motor, including a shell and a stator, a rotor and a rotating shaft installed inside the shell, a circuit board is arranged inside the shell, a plurality of magnetic induction elements are arranged on the circuit board, and a conductive plug is also arranged on the circuit board; a magnetic induction ring is arranged inside the shell, and the magnetic induction ring is sleeved on the rotating shaft.

[0007] Furthermore, four magnetic induction elements are arranged on the circuit board.

[0008] Furthermore, the magnetic induction elements are evenly distributed on the outer edge of the circuit board, and the angle between every two adjacent magnetic induction elements is 90 degrees.

[0009] Furthermore, a limiting portion is provided between the circuit board and the stator, and the circuit board is buckled to the upper end of the stator through the limiting portion.

[0010] Furthermore, the limiting portion includes a plurality of limiting blocks protruding from the upper end of the stator and limiting holes on the outer edge of the circuit board adapted to the limiting blocks, and the limiting blocks pass through the limiting holes.

[0011] Furthermore, a connecting hole adapted to the rotating shaft is provided at the center of the magnetic induction ring, and a limiting ring extending outward is provided on the side wall of the rotating shaft, and the limiting ring abuts against the lower end of the magnetic induction ring.

[0012] Furthermore, the distance between the magnetic induction ring and the circuit board is 1.5 mm-4 mm.

[0013] Furthermore, at least two bearings are provided on the rotating shaft.

[0014] Furthermore, the shell includes an upper shell and a lower shell, the outer contour of the stator is matched with the inner contours of the upper shell and the lower shell, and the upper shell, the lower shell and the stator are fixed by means of threads.

[0015] Furthermore, the outer edges of the upper shell and the lower shell are respectively provided with a plurality of upper threaded holes and lower threaded holes distributed in an annular manner, and the side walls of the circuit board and the stator are respectively provided with a plurality of upper threaded grooves and lower threaded grooves in annular portions, the upper threaded holes, the lower threaded holes, the upper threaded grooves, and the lower threaded grooves are in the same longitudinal direction, and screws are fixed from top to bottom through the upper threaded holes, the upper threaded grooves, the lower threaded grooves, and the lower threaded holes in sequence.

[0016] The beneficial effects of adopting the technical solution of the utility model are as follows: a plurality of magnetic induction elements are arranged on the circuit board, and a guide plug is also arranged on the circuit board. When the motor is energized, the coil winding on the stator generates a magnetic field, and the signal is transmitted to the magnetic induction element on the circuit board through the conductive plug, so that the circuit board can control the speed of the motor; a magnetic induction ring is arranged in the shell, and the magnetic induction ring is sleeved on the rotating shaft, and an additional magnetic induction ring is added, which further increases the accuracy of the conductive plug detection, and can transmit more accurate signals to the magnetic induction element, so that the error is smaller and the motor speed is controlled more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The three-dimensional Figure 1 .

[0018] Figure 2 It is a cross-sectional view of the utility model.

[0019] Figure 3 The three-dimensional Figure 2 .

[0020] Figure 4 The explosion of the utility model Figure 1 .

[0021] Figure 5 The explosion of the utility model Figure 2 .

[0022] Figure 6 It is a schematic diagram of a sine wave of the present utility model.

[0023] In the figure: 1, shell, 2, stator, 3, rotor, 4, rotating shaft, 5, circuit board, 6, limiting part, 7, magnetic induction element, 8, conductive plug, 9, magnetic induction ring, 10, limiting block, 11, limiting hole, 12, connecting hole, 13, upper shell, 14, lower shell, 15, upper threaded hole, 16, lower threaded hole, 17, upper thread groove, 18, lower thread groove, 19, screw, 20, bearing, 21, first sine wave, 22, second sine wave, 23, third sine wave, 24, fourth sine wave. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are further described in conjunction with the accompanying drawings to make the present technical solution clearer and more understandable.

[0025] like Figure 1-6 As shown, a brushless motor comprises a housing 1 and a stator 2, a rotor 3 and a rotating shaft 4 installed inside the housing 1. The stator 2 is fixed inside the housing 1, and the rotating shaft 4 passes through the rotor 3. The inner ring of the stator 2 is provided with a plurality of coil windings. When the motor is energized, the coil windings on the stator 2 generate a magnetic field, and then the rotor 3 drives the rotating shaft 4 to rotate. As shown, a circuit board 5 is provided inside the housing 1. The circuit board 5 is annular. A limiting portion 6 is provided between the circuit board 5 and the stator 2. The circuit board 5 is buckled to the upper end of the stator 2 through the limiting portion 6 to prevent the circuit board 5 from being displaced during operation. A plurality of magnetic induction elements 7 are provided on the circuit board 5. A conductive plug 8 is also provided on the circuit board 5. The magnetic field generated by the coil windings on the stator 2 being energized receives an electrical signal through the conductive plug 8 and transmits it to the magnetic induction element 7. The magnetic induction element 7 is a magnetic induction chip, which analyzes and processes the electrical signal to adjust the speed of the motor.

[0026] A magnetic induction ring 9 is provided in the housing 1, and the magnetic induction ring 9 is sleeved on the rotating shaft 4. The magnetic induction ring 9 is located at the upper end of the circuit board 5, and the coil winding on the stator 2 is located at the lower end of the circuit board 5. The magnetic induction ring 9 is similar to the coil winding, and a magnetic field is also generated when power is turned on. An additional magnetic induction ring 9 is added to further increase the accuracy of the conductive plug 8 in receiving the electrical signal, and can transmit a more accurate electrical signal to the magnetic induction element 7, so that the error is smaller and the motor speed is controlled more accurately.

[0027] The circuit board 5 shown is provided with four magnetic induction elements 7, which output four sinusoidal waves, namely the first sinusoidal wave 21, the second sinusoidal wave 22, the third sinusoidal wave 23 and the fourth sinusoidal wave 24. The motor relies on sinusoidal wave control, that is, by applying a certain voltage to the motor winding, a sinusoidal current is generated in the motor winding, and the purpose of controlling the motor torque is achieved by controlling the amplitude and phase of the sinusoidal current. The design of four sinusoidal waves greatly guarantees the stability and accuracy of the electrical signal compared to three or even two sinusoidal waves.

[0028] The magnetic induction elements 7 are evenly distributed on the outer edge of the circuit board 5, and the angle between every two adjacent magnetic induction elements 7 is 90 degrees. The four magnetic induction elements 7 are distributed in a circular manner around the magnetic field. Therefore, the first sine wave 21 is symmetrical with the fourth sine wave 24, the second sine wave 22 is symmetrical with the third sine wave 23, and each adjacent sine wave is 90 degrees apart. The uniform distribution is conducive to more accurate detection of electrical signals. Figure 6 In the sinusoidal wave waveform diagram shown, the horizontal axis is time and the vertical axis is volts. During the working process, as time goes by, the voltage generated by the four sine waves will gradually change, but it is always between two constant values, which is used to adjust the speed of the motor so that it is always at a constant value.

[0029] The shown limiting portion 6 includes a plurality of limiting blocks 10 protruding from the upper end of the stator 2 and limiting holes 11 on the outer edge of the circuit board 5 that are adapted to the limiting blocks. The limiting blocks 10 pass through the limiting holes 11, preferably three limiting blocks 10, which fix the circuit board 5 in a triangular shape to prevent the circuit board from displacement.

[0030] The center of the magnetic induction ring 9 is provided with a connecting hole 12 adapted to the rotating shaft 4, and the rotating shaft 4 passes through the connecting hole 12. A limiting ring 13 extending outward is provided on the side wall of the rotating shaft 4, and the limiting ring 13 abuts against the lower end of the magnetic induction ring to prevent the magnetic induction ring 9 from falling.

[0031] The distance between the magnetic induction ring 9 and the circuit board 5 is 1.5mm-4mm. A certain gap is left between the magnetic induction ring 9 and the circuit board 5 to avoid contact, reduce friction and noise, and ensure a good service life of the product. If the distance is less than 1.5mm, the distance to the circuit board 5 is too close, and friction may occur due to external force deformation; if the distance is greater than 4mm, the distance is too large to detect accurately.

[0032] The housing 1 shown includes an upper housing 13 and a lower housing 14. The outer contour of the stator 2 matches the inner contour of the upper housing 13 and the lower housing 14. The upper housing 13, the lower housing 14 and the stator 2 are fixed by means of threads. The outer edges of the upper housing 13 and the lower housing 14 are respectively provided with a plurality of upper threaded holes 15 and lower threaded holes 16 distributed in an annular manner, preferably three, and the side walls of the circuit board 5 and the stator 2 are respectively provided with a plurality of upper threaded grooves 17 and lower threaded grooves 18 in an annular portion, preferably three as well. The upper threaded hole 15, the lower threaded hole 16, the upper threaded groove 17 and the lower threaded groove 18 are in the same longitudinal direction, and a screw 19 is provided to pass through the upper threaded hole 15, the upper threaded groove 17, the lower threaded groove 18 and the lower threaded hole 16 from top to bottom for fixing.

[0033] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A brushless motor, comprising a housing and a stator, a rotor and a rotating shaft installed inside the housing, characterized in that: A circuit board is arranged in the shell, a plurality of magnetic induction elements are arranged on the circuit board, and a conductive plug is also arranged on the circuit board; a magnetic induction ring is arranged in the shell, and the magnetic induction ring is sleeved on the rotating shaft.

2. A brushless motor according to claim 1, characterized in that: Four magnetic induction elements are arranged on the circuit board.

3. A brushless motor according to claim 2, characterized in that: The magnetic induction elements are evenly distributed on the outer edge of the circuit board, and the angle between every two adjacent magnetic induction elements is 90 degrees.

4. A brushless motor according to claim 1, characterized in that: A limiting portion is arranged between the circuit board and the stator, and the circuit board is buckled to the upper end of the stator through the limiting portion.

5. A brushless motor according to claim 4, characterized in that: The limiting part includes a plurality of limiting blocks protruding from the upper end of the stator and limiting holes on the outer edge of the circuit board adapted to the limiting blocks, and the limiting blocks pass through the limiting holes.

6. A brushless motor according to claim 1, characterized in that: A connecting hole adapted to the rotating shaft is arranged at the center of the magnetic induction ring, and a limiting ring extending outward is arranged on the side wall of the rotating shaft, and the limiting ring abuts against the lower end of the magnetic induction ring.

7. The brushless motor according to claim 1, characterized in that: The distance between the magnetic induction ring and the circuit board is 1.5 mm-4 mm.

8. The brushless motor according to claim 1, characterized in that: At least two bearings are arranged on the rotating shaft.

9. The brushless motor according to claim 1, characterized in that: The housing comprises an upper housing and a lower housing, the outer contour of the stator matches the inner contours of the upper housing and the lower housing, and the upper housing, the lower housing and the stator are fixed by means of threads.

10. A brushless motor according to claim 9, characterized in that: The outer edges of the upper shell and the lower shell are respectively provided with a plurality of upper threaded holes and lower threaded holes distributed in an annular manner, and the side walls of the circuit board and the stator are respectively provided with a plurality of upper threaded grooves and lower threaded grooves in annular portions, the upper threaded holes, the lower threaded holes, the upper threaded grooves, and the lower threaded grooves are in the same longitudinal direction, and screws are provided to pass through the upper threaded holes, the upper threaded grooves, the lower threaded grooves, and the lower threaded holes in sequence from top to bottom to fix them.

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