Electric drive

Abstract

The invention relates to acoustics. The electrodynamic transducer comprises a frame having two pairs of clamps (jaw) that are positionally adjustable and fixable along a longitudinal axis of the frame attached thereto; a magnetic system disposed on the frame and including a permanent magnet; and a terminal plate. The diaphragm is fixed between the clamps, and the conductor is applied to the diaphragm. The permanent magnets on the frame and the conductors on the diaphragm are arranged diagonally at an angle to the longitudinal axis of the frame, the inclination angle of the permanent magnets with respect to the frame axis and the inclination angle of the conductors with respect to the frame axis being equal, ranging between 1 and 89 degrees, and the surface of the clamp has a profile in the shape of a periodic sine wave. When the diaphragm is tensioned, the surface of the clamp may form a corrugation on the diaphragm. According to the invention, the sound power of the transducer can be improved, nonlinear distortion is reduced, unnecessary resonance is reduced, and sound diffusion is increased.

Description

Technical Field

[0001] The invention relates to the field of electroacoustics and can be used to manufacture acoustic systems and headphones. A disadvantage of the known designs is that during oscillation, areas of higher and lower pressure occur in the gap between the magnet and the diaphragm, which dampens the oscillation of the diaphragm regionally in these areas below the magnet. As the amplitude increases, this increases the mismatch between the motion of the active and passive areas in the diaphragm, resulting in phase, amplitude, harmonic and transient distortions. Prior art

[0002] Application RU2580217С1 published on April 10, 2016 describes the design of an electrodynamic driver. The invention aims to increase the acoustic power of the driver and reduce nonlinear and parasitic resonances. This result is achieved by using trapezoidal or semicircular magnets and corrugating the diaphragm. Among them, the shape of the magnets reduces the acoustic impedance due to airflow and a more uniform magnetic field, while the corrugation increases the acoustic power of the driver. However, the corrugation produced by the technology must be thick enough to maintain its shape, which reduces the sensitivity of the sound driver. In addition, in such a transducer, the conductors are placed transversely with respect to the corrugation, and the resonance is reduced by applying vibration damping materials, which increases the weight of the diaphragm. In addition, the transverse arrangement of the conductors leads to an increase in resonance. Summary of the invention

[0003] The object of the present invention is to develop an electric drive which does not have the disadvantages found in the known electric drives.

[0004] The technical result of the present invention is increased acoustic power of the driver, reduced non-linear distortion, lowered parasitic resonances, and improved sound diffusion.

[0005] The technical result is achieved by the fact that the electric drive comprises a frame to which are fixed two pairs of brackets, which are located on at least one side of the frame and are designed for position adjustment and fixing along the longitudinal axis of the frame; a magnetic system located on at least one side of the frame and made of permanent magnets; and at least one terminal block for connecting conductors in the circuit. Wherein the diaphragm is fixed between the brackets and the conductor is applied on at least one side of the diaphragm. Wherein the permanent magnets on the frame and the conductors on the diaphragm are positioned diagonally to the longitudinal axis of the frame, where the inclination angles (β) of the permanent magnets relative to the longitudinal axis of the frame and the inclination angles (β1) of the conductors relative to the longitudinal axis of the frame are equal to each other and range between 1 and 89 degrees, and the surface of the brackets between which the diaphragm is fixed has a profile in the shape of a periodic sinusoidal wave, and when the diaphragm is stretched, the surface of the brackets ensures the formation of corrugations on the diaphragm. The terminal block is made of jumper wires.

[0006] The surface of the permanent magnet facing the diaphragm has a periodic sinusoidal profile, and the inclination angle (β2) of the profile cross section relative to the longitudinal axis of the magnet is equal to the inclination angle (β) of the permanent magnet relative to the longitudinal axis of the frame, ranging from 1 to 89 degrees.

[0007] The technical result is also achieved by the fact that the electric drive comprises a frame to which two pairs of brackets are fixed, which are located on at least one side of the frame and are designed for position adjustment and fixing along the longitudinal axis of the frame; a magnetic system located on at least one side of the frame and made of permanent magnets; and at least one terminal board for connecting conductors in the circuit. Wherein the diaphragm is fixed between the brackets and the conductor is applied on at least one side of the diaphragm. Wherein the permanent magnets on the frame and the conductors on the diaphragm are positioned diagonally to the longitudinal axis of the frame, wherein the inclination angle (β) of the permanent magnets relative to the longitudinal axis of the frame and the inclination angle (β1) of the conductors relative to the longitudinal axis of the frame are equal to each other and range between 1 and 89 degrees, and the brackets between which the diaphragm is fixed have a comb-shaped profile with a profile spacing of P = 0.5-50 mm, a profile angle of α = 1-179 degrees, a radius of R = (0.001-0.25)·P, and when the diaphragm is stretched, the surface of the brackets ensures that corrugations are formed on the diaphragm.

[0008] The terminal strip is made of jumper wires.

[0009] The surface of the permanent magnet facing the diaphragm has a comb-shaped profile, the profile spacing is P = 0.5-50 mm, the profile angle is α = 1-179 degrees, the radius is R = (0.001-0.25)·P, and the inclination angle (β2) of the profile cross section relative to the longitudinal axis of the frame is equal to the inclination angle (β) of the permanent magnet relative to the longitudinal axis of the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The invention will be better understood by the description, which is not limiting and is provided with reference to the accompanying drawings, which show the following:

[0011] Figure 1 An overall view of the acoustic system electric drive is shown.

[0012] Figure 2 An overall view of the acoustic system electrodynamic driver assembly is shown.

[0013] Figure 3 An overall view of the earphone electrodynamic driver is shown.

[0014] Figure 4 A top view of an acoustic system electrodynamic driver according to a first embodiment of the present invention is shown.

[0015] Figure 5 A cross-sectional view of an acoustic system electrodynamic driver including a magnet according to a first embodiment of the present invention is shown.

[0016] Figure 6 A cross-sectional view of an electric drive including a diaphragm and a support according to a second embodiment of the present invention is shown.

[0017] Figure 7 A cross-sectional view of an electric drive including a diaphragm and a support according to a first embodiment of the present invention is shown.

[0018] Figure 8 A cross-sectional view of an acoustic system electrodynamic driver including a magnet according to a second embodiment of the present invention is shown.

[0019] Fig. 9 A top view of an earphone electrodynamic driver is shown.

[0020] Fig.10 A cross-sectional view of an earphone electric driver including a magnet according to a second embodiment of the present invention is shown.

[0021] Fig.11 A cross-sectional view of an earphone electric driver including a magnet according to a first embodiment of the present invention is shown.

[0022] Fig.12 A top view and a cross-sectional view of a magnet according to a second embodiment of the present invention are shown.

[0023] Fig.13 A top view and a cross-sectional view of a magnet according to a first embodiment of the present invention are shown.

[0024] 1–frame; 2–bracket; 3–diaphragm; 4–conductor; 5–permanent magnet; 6–terminal board; 7–jumper wire; 8–strip; 9–screw; 10–nut. DETAILED DESCRIPTION

[0025] According to a first embodiment of the invention, an electric drive comprises a frame 1 on which two pairs of brackets 2 are fixed, the brackets 2 being located on at least one side of the frame 1; a diaphragm 3 fixed between the brackets 2; a magnetic system in the form of a permanent magnet 5 mounted on at least one side of the frame 1; and at least one terminal block 6 for connecting conductors in a circuit. The brackets 2 are designed to adjust their position along the longitudinal axis of the frame 1 and are fixed to the frame using screws 9 and nuts 10. The diaphragm 3 is also bonded to a strip 8 along its long edges. A conductor 4 is applied to at least one side of the diaphragm 3. The permanent magnets 5 on the frame 1 and the conductors 4 on the diaphragm 3 are positioned diagonally to the longitudinal axis of the frame, wherein the inclination angles (β) of the permanent magnets relative to the longitudinal axis of the frame and the inclination angles (β1) of the conductors relative to the longitudinal axis of the frame are equal to each other and range between 1 and 89 degrees, and the surface of the brackets between which the diaphragm is fixed has a profile in the shape of a periodic sinusoidal wave, and when the diaphragm is stretched, the surface of the brackets ensures that ripples are formed on the diaphragm. The electric drive according to the first embodiment of the invention is used for an acoustic system ( Figure 1 ) and headphones( Figure 3 ). The acoustic system electric driver uses two terminal boards 6 designed with jumpers 7 to connect the various conductors 4 of the diaphragm 3 in the series circuit (voice coil). In the headphone electric driver, the voice coil is part of the diaphragm 3 design and does not require jumpers 7. The surface of the permanent magnet 5 facing the diaphragm 3 has a periodic sinusoidal wave-shaped profile, and the inclination angle (β2) of the profile cross section relative to the longitudinal axis of the magnet is equal to the inclination angle (β) of the permanent magnet relative to the longitudinal axis of the frame, ranging from 1 to 89 degrees.

[0026] The formula for calculating the profile (y) of the periodic sinusoidal shape of the stent is as follows:

[0027] y=a+b cos(cx+d),

[0028] Where "a" is the displacement of the sinusoid along the Oy axis, "b" is the stretching of the function along the Oy axis, "c" is the displacement of the sinusoid along the Ox axis, and "d" is the stretching of the function along the Ox axis.

[0029] According to a second embodiment of the invention, the electric drive comprises a frame 1 to which two pairs of brackets 2 are fixed, the brackets 2 being located on at least one side of the frame 1; a diaphragm 3 fixed between the brackets 2; a magnetic system in the form of a permanent magnet 5 mounted on at least one side of the frame 1; and at least one terminal board 6 for connecting conductors in the circuit. The brackets 2 are designed to be adjusted in position and fixed along the longitudinal axis of the frame 1 and are fixed to the frame using screws 9 and nuts 10. The diaphragm 3 is also bonded to the strip 8 along its long edges. The conductor 4 is applied to at least one side of the diaphragm 3. The permanent magnet 5 on the frame 1 and the conductor 4 on the diaphragm 3 are positioned diagonally to the longitudinal axis of the frame 1, wherein the inclination angle (β) of the permanent magnet relative to the longitudinal axis of the frame and the inclination angle (β1) of the conductor relative to the longitudinal axis of the frame are equal to each other, ranging from 1 to 89 degrees, and the bracket 2 in which the diaphragm 3 is fixed has a comb-shaped profile, a profile spacing of P = 0.5-50 mm, a profile angle of α = 1-179 degrees, and a radius of R = (0.001-0.25)·P. When the diaphragm is stretched, the surface of the bracket can ensure that corrugations are formed on the diaphragm.

[0030] The electrodynamic driver according to the second embodiment of the present invention is used in an acoustic system ( Figure 1 ) and headphones( Figure 3 ). The acoustic system electric driver uses two terminal blocks 6 designed with jumpers 7 to connect the various conductors 4 of the diaphragm 3 in the series circuit (voice coil). In the headphone electric driver, the voice coil is part of the headphone design and the jumper 7 is not required.

[0031] The surface of the permanent magnet facing the diaphragm has a comb-shaped profile, the profile spacing is P = 0.5-50 mm, the profile angle is α = 1-179 degrees, the radius is R = (0.001-0.25)·P, and the inclination angle (β2) of the profile cross section relative to the longitudinal axis of the frame is equal to the inclination angle (β) of the permanent magnet relative to the longitudinal axis of the frame.

[0032] The working principle of the electric drive is as follows. Alternating current is applied to the conductor 4 via the terminal board 6. As a result, the permanent magnet 5 generates a permanent magnetic field. When the conductor 4 is excited by the alternating magnetic field, this magnetic field interacts with the magnetic field of the permanent magnet 5 to produce a back and forth movement of the diaphragm 3 relative to the magnetic system, thereby causing sound to be transmitted from the electric drive.

[0033] When the diaphragm 3 stretches, due to the formation of corrugations thereon, this increases the stiffness of the diaphragm 3, resulting in a more uniform movement of the diaphragm 3 over the entire area, which in turn increases the acoustic power of the driver at the same input electrical power. The same result is achieved by the features associated with higher pressure areas and lower pressure areas between the diaphragm 3 and the magnet 5, which are less damped with this diaphragm profile. In addition, the shape of the corrugations of the diaphragm affects an increase in sound diffusion.

[0034] The technical result, i.e. the reduction of nonlinear and parasitic distortions, is influenced by the arrangement of the conductors 4 on the diaphragm 3 and the magnetic system 5 on the frame 1. The conductors 4 on the diaphragm 3 and the magnetic system 5 on the frame 1 are arranged at an inclination angle β=β1 (between 1 and 89 degrees). Figure 4 , Fig.10 ) are diagonally positioned, wherein an inclination angle β=β1 is formed between the longitudinal axis of the frame 1 and the longitudinal axis of the magnet 5 and the conductor 4. By this diagonal arrangement of the conductor 4 and the magnetic system, the magnetic induction load on each subsequent corrugation will be applied with a stepped offset along the longitudinal axis of the diaphragm 3, so that the oscillations of adjacent corrugations will not occur in the same cross section and will not have the same amplitude, which will reduce parasitic resonances.

[0035] Fig.12 The electric drive in may have a permanent magnet designed with a comb-like profile, with a profile step P = 0.5-50 mm, a profile angle α = 1-179 degrees, a radius R = (0.001...0.25)·P, and an inclination angle β2 = β of the comb-like profile relative to the longitudinal axis of the magnet.

[0036] Fig.13 The electric drive in may have a permanent magnet designed to have a periodic sinusoidal-shaped profile, whose profile cross section has an inclination angle β2=β with respect to the longitudinal axis of the magnet.

[0037] In these types of magnets, the poles are equidistant from the voice coil, which additionally increases the acoustic power of the driver.

[0038] The present invention has been disclosed above with reference to specific embodiments thereof. Other embodiments of the present invention that do not change the essence of the present invention disclosed in this specification may also be apparent to those skilled in the art. Therefore, the present invention should be deemed to be limited in scope only by the appended claims.

Claims

1. An electric drive, characterized in that: The electric drive comprises a frame on which are fixed two pairs of brackets, the brackets being located on at least one side of the frame and being designed for position adjustment and fixing along the longitudinal axis of the frame, wherein a diaphragm is fixed between the brackets and a conductor is applied on at least one side of the diaphragm; a magnetic system located on at least one side of the frame and made of permanent magnets; and at least one terminal board for connecting conductors in a circuit; wherein the permanent magnets on the frame and the conductors on the diaphragm are positioned diagonally to the longitudinal axis of the frame, wherein the inclination angle (β) of the permanent magnets relative to the longitudinal axis of the frame and the inclination angle (β1) of the conductors relative to the longitudinal axis of the frame are equal to each other and range between 1 and 89 degrees, and the surface of the brackets between which the diaphragm is fixed has a contour in the shape of a periodic sine wave, and when the diaphragm is stretched, the surface of the brackets ensures that ripples are formed on the diaphragm.

2. The electric drive according to claim 1, characterized in that The electric drive includes a terminal board designed with jumpers.

3. The electric drive according to claim 1, characterized in that: The surface of the permanent magnet facing the diaphragm has a periodic sinusoidal profile, and the inclination angle (β2) of the profile cross section relative to the longitudinal axis of the magnet is equal to the inclination angle (β) of the permanent magnet relative to the longitudinal axis of the frame, ranging from 1 to 89 degrees.

4. An electric drive, characterized in that: The electric drive comprises a frame on which two pairs of brackets are fixed, the brackets being located on at least one side of the frame and designed for position adjustment and fixing along the longitudinal axis of the frame, wherein a diaphragm is fixed between the brackets and a conductor is applied on at least one side of the diaphragm; a magnetic system located on at least one side of the frame and made of permanent magnets; and at least one terminal block for connecting conductors in an electric circuit; wherein the permanent magnets on the frame and the conductors on the diaphragm are positioned diagonally to the longitudinal axis of the frame, wherein the inclination angles (β) of the permanent magnets relative to the longitudinal axis of the frame and the inclination angles (β1) of the conductors relative to the longitudinal axis of the frame are equal to each other and range between 1 and 89 degrees, the brackets between which the diaphragm is fixed have a comb-shaped profile with a profile spacing of P=0.5-50 mm, a profile angle of α=1-179 degrees, a radius of R=(0.001-0.25)·P, and when the diaphragm is stretched, the surface of the brackets ensures that corrugations are formed on the diaphragm.

5. The electric drive according to claim 4, characterized in that: The electric drive includes a terminal board designed with jumpers.

6. The electric drive according to claim 4, characterized in that The surface of the permanent magnet facing the diaphragm has a comb-shaped profile, the profile spacing is P = 0.5-50 mm, the profile angle is α = 1-179 degrees, the radius is R = (0.001-0.25)·P, and the inclination angle (β2) of the profile cross section relative to the longitudinal axis of the frame is equal to the inclination angle (β) of the permanent magnet relative to the longitudinal axis of the frame.

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