Car steering wheel electromechanical booster

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to car steering wheel electromechanical booster. Proposed booster comprises housing accommodating two aligned shafts (input and output), m-phase motor excited from tangentially magnetised permanent magnets, stator magnetic core built in booster housing, rotor magnetic core, rotor position pickup and torque pickup. Stator magnetic core features salient poles arranged in Nm equal alternating phase zones, where N is number of phase zones, and with Nmk poles, where k=1…n is number of poles in phase zone whereon coils are fitted, one per one pole. Several coils connected in parallel aiding are arranged in each zone. Rotor windingless multi-pole magnetic core is fitted on output shaft. Number of poles on stator and rotor differ by N. Torque pickup is made up of torsion box and torsion box twisting angle metre. Torsion box is arranged inside space formed by input and output shafts. Pole tips are arranged on stator poles via nonmagnetic air gap, whereto like poles of excitation system permanent magnets adjoin.

EFFECT: improved ergonomics due to reduced force to applied to steering wheel.

4 cl, 4 dwg

 

The technical field to which the invention relates.

The invention relates to the automotive industry.

The level of technology

Known Electromechanical power steering, comprising a housing and arranged in two coaxial shaft (input and output), m-phase motor with excitation from tangentially magnetized permanent magnets, the magnetic circuit of the stator is built into the body of the amplifier, the magnetic circuit of the stator is made with salient poles arranged at equal to 2m alternating phase zones, with the number of poles 2mk, where k=1...n is the number of poles in the phase zone that hosts coils - one for each pole, each zone has posted a few included in series or in parallel according-according coils, the magnetic circuit of the rotor located on the output shaft, made multipolar winding, the number of poles on the stator and on the rotor differ by two, the position sensor rotor, a torque sensor, made in the form of torsion meter of the twisting angle of the torsion bar, the torsion bar is located inside the cavity formed by the input and output shaft (EN 2181091, 62D 5/04, 2000 and EN 2278797, 62D 5/04, NC 21/16, 2006).

The disadvantage of these Electromechanical power steering is the relative complexity of the design and low-tech manufacturing due to the closely located on the rotor permanent magnets that conditioned the t complexity of Assembly operations in the Assembly of the rotor and stator in a single structural unit. Besides the above-mentioned power steering have high enough energy indicators due to the fact that the working magnetic flux from the magnetic field from the stator windings is closed through the permanent magnet excitation system having a low magnetic permeability (and hence low conductivity magnetic flux and having a considerable thickness, at least, different from the length of the air gap on the order in a big way. The latter is determined by the manufacturing technology of magnets and constructive necessity. For example, if the length of the air gap of 0.15-0.25 mm, the thickness of the magnet must be in the range of 2.5 to 4.0 mm

In the above amplifiers pole division of rotor poles and stator varies. This fact leads to the appearance of higher harmonics of the magnetic conductivity in the working gap and poor energy performance.

A relatively small number of salient poles on the stator and the rotor causes a significant amount of the pulsating torque, caused by the action of the field permanent magnet excitation when de-energized stator windings, which leads to increased effort on the steering wheel, creates inconvenience to the driver when the use of these amplifiers, i.e. leads to poor ergonomic features.

The essence of what bretania

The closest to the essence of the present invention is the prototype of the proposed technical solution is the Electromechanical power steering of the vehicle described in EN 2278797, 62D 5/04, NC 21/16. The objective of the proposed technical solution is the improvement of manufacturability, improve energy performance and ergonomic characteristics of Electromechanical power steering of the car.

To improve the manufacturability results in the placement of the permanent magnet excitation on the stator of the motor between the pole pieces that are adjacent to the pole tips of the poles of the same polarity, pole pieces at the poles established through the non-magnetic gap measure based air gap. This placement of the magnets also leads to the possibility of increasing the conductivity of the magnetic circuit of the circuit of the magnetic flux field from the stator windings, which ultimately leads to improved energy performance.

To improve energy performance also contributes to the implementation of the width of the salient poles on the stator and the rotor and the pole divisions between the poles of the rotor and stator within one phase zone is equal, the offset pole divisions between the poles of adjacent phase zones of the stator 1/3 pole division of the rotor.

List of figures, drawings and other materials

Figure 1 shows a cross section of the electric motor offer power steering of the car.

Figure 2 shows a section of the active zone of the electric motor Electromechanical power steering with equal widths of the poles on the stator and the rotor, and with equal pole divisions between the poles of the rotor and stator within phase zones.

Figure 3 shows the active area of the motor with a uniform location on the circumference of rotor poles and stator with equal widths of the poles.

Figure 4 shows the active area of the motor with toothed surfaces of the rotor and stator.

Information confirming the possibility of carrying out the invention

The proposed Electromechanical power steering in their design is similar to the prototype, except for the distinctive parts described above.

Figure 1 shows the cross-section of the motor (other constructive elements of the Electromechanical steering not shown). The stator 1 of the motor, which is the body of the amplifier, made from soft magnetic material of the magnet with the number of poles Nmk=12, where N=1...n, the number of zones of poles phase; N=2,k=2, m=3, each pole of which is placed a coil 2; these coils, connected in parallel according constitute a phase winding of the stator. Phase winding localized in evenly spaced around the bore of the stator N zones. When the three-phase stator winding of such zones is six, as shown in figure 1, zones of opposite phases are shifted relative to each other at 120 e. C. At the poles of the stator through the non-magnetic gap length δnemagset pole pieces 3. These pole tips from the sides adjacent radially spaced permanent magnets 4 excitation system. Magnets magnetized in the tangential direction and the pole tips adjacent poles of the same polarity. The rotor of the electric motor 5 is made winding of the magnet with the number of poles N(mk+1)=14 and mounted on the shaft 6. The number of poles on the rotor and even differs from the number of poles on the stator by two.

Excitation system consisting of tangentially magnetized permanent magnet that forms a magnetic field, the magnetic flux which is divided into two parts: one part which closes the circuit through the pole pieces, an air gap, the pole and the back of the rotor; the second part is through the pole pieces, a non-magnetic gap between the tips and the stator poles, the poles of the stator and the back of the stator is. The ratio of the lengths of the working air δpand nonmagnetic δnemaggaps determines the magnitude of the magnetic flux. Specific values of the lengths of the gaps are determined based on considerations of the maximum energy of permanent magnets. It is obvious that the length of the air gap δpand nonmagnetic gap δnemagshould be comparable in the same order, and their ratio must be chosen for reasons of concentration greater part of the magnetic flux of the excitation system fpostin the air gap. In the figure 1 case, the width of the pole pieces is larger than the width of the poles on the stator, which leads to high conductivity for magnetic flux through the air gap compared to the non-magnetic gap even when they are equal.

When connecting the coils of the stator winding to a power source of the magnetic field from permanent magnet excitation system and the field from the stator windings will be formed, forming the resulting magnetic field. The rotor will occupy such a position in which the conductivity for the highest value of the resulting magnetic flux maximum. As shown in figure 1, in this case, the magnetic flux from the field winding of the stator fslaveand a large part of the magnetic flux field excitation fpostin the air gap, the poles of ispence rotor and directed according to the fold. The non-magnetic gap, the poles of the stator and the back stator fslavedirected counter small part of the flow fpostand therefore, they are deducted. The interaction of the field excitation windings and the stator in the air gap causes the appearance of a torque of the rotor, and its value is greater, the greater the value of magnetic flux. As the magnetic conductivity of the magnetic flux field of the stator winding fslavethe proposed electric power steering is significantly greater than in known, with significantly lower values of current consumption is achieved the required torque of the output shaft of the amplifier. Thus the energy performance of the proposed power steering of the car is better than in the known technical solutions.

When the proposed method of placement of the magnet excitation system facilitates the Assembly process of the motor: first is the placement of the windings on the poles, installation of pole pieces, assembling the stator-rotor", only then are permanent magnets according to their localization. This simplifies operations with permanent magnets, reduces Assembly time and does not require the cost of producing expensive special technological equipment for Assembly of magnetic systems.

Figure 2 shows the Yong Electromechanical power steering of the vehicle, expressed pole of the stator and rotor of the motor which is made equal to the width of the inp, the poles of the stator within the phase zones have equal pole division with the poles of the rotor τ. Adjacent pole (bordering poles of other phases) of different phases are shifted relative to each other at a distance that is a multiple of 1/3 pole division of the rotor (4/3τ). This placement of the poles leads to a change in conductivity of the air gap for the magnetic flux during rotation of the rotor relative to the stator by a harmonic dependence of the maximum to the minimum value. This circumstance leads to the reduction of higher harmonic components of torque and improves energy performance.

Figure 3 shows the Electromechanical power steering of the vehicle, expressed pole of the stator and rotor of the motor which are evenly spaced around the circumference, is made equal to the width of the inp, polar division of the stator differs from pole dividing the rotor τ 1/3 of the value of the pole division of the rotor, adjacent coils of the same name connected in opposite phase-sequence or counter-parallel, the number of poles on the stator is different from the number of poles on the rotor by the number of pairs of poles phases. In this construction the number of pairs of poles phases is four. Therefore, the number of poles p is the Torah made equal to 16. Workflows in the electric power steering similar to that described above. This design is one of the options that achieve their purpose.

Figure 4 shows an embodiment of the electric motor Electromechanical power steering car with the toothed surfaces of the active parts facing to each other surfaces of the rotor and stator are made of gear with the same width of teeth, and in equal subcommi divisions τz. Pole stator within phase zone is made with equal pole division multiple subcolony division, the adjacent poles of different phases are shifted relative to each other at a distance that is a multiple of 1/3 subcolony division.

When the rotation of the rotor relative to the stator periodically in proportion to the frequency displacement of the rotor relative to each other, there occurs a redistribution of the magnetic flux of the excitation system between poles of different phases. This redistribution is proportional to the difference between the conductivity of the air gap under the poles of different phases. In case the surfaces of the stator poles and rotor smooth the difference between the conductivity of the air gap for the flow of excitation is proportional to 1/3 the width of the pole division. When running surfaces of the pole teeth, the difference in the conductivity of the air gap is proportional to 1/3 zu novogo step. From the above it follows that the difference between the conductivity of the excitation current in the second case is much less than in the case of performing smooth poles. Thus, by performing the surface of stator poles and rotor gear is achieved by reducing the pulsation of the magnetic flux of the excitation system in the air gap. This circumstance leads to a reduction in effort when turning the steering wheel when de-energized windings on the stator and improved ergonomic characteristics of the Electromechanical power steering of the car.

1. Electromechanical power steering of a vehicle, comprising a housing and arranged in two coaxial shaft (input and output), m-phase motor with excitation from tangentially magnetized permanent magnets, the magnetic circuit of the stator integrated in the housing of the amplifier and is made with salient poles arranged in Nm equal phase alternating zones, where N is the number of phase zones, with the number of poles Nmk, where k=1...n is the number of poles in the phase zone that hosts coils - one for each pole, each zone contains multiple connected in parallel according coils, the rotor magnetic circuit located on the output shaft and made multipolar winding, the number of poles on the stator and on the rotor differ by N, the sensor rotor position and torque sensor, made in the de torsion meter of the twisting angle of the torsion bar, the torsion bar is located inside the cavity formed by the input and output shafts, characterized in that the stator poles through the non-magnetic gap measure based air gap installed pole pieces, which are adjacent permanent magnet excitation system poles of the same polarity.

2. Electromechanical power steering according to claim 1, characterized in that the distinct poles of the rotor and stator is made equal to the width of the poles of the stator within the phase zones have equal pole division with the poles of the rotor, adjacent poles of different phases are shifted relative to each other at a distance that is a multiple of 1/3 pole division of the rotor.

3. Electromechanical power steering according to claim 1, characterized in that the distinct poles of the stator and rotor are evenly spaced around the circumference of the pole division of the stator differs from pole dividing the rotor 1/3 of the value of the pole division of the rotor, adjacent coils of the same name phases connected in opposite series or parallel counter, the number of poles on the stator and the rotor differs by the number of pairs of poles phases.

4. Electromechanical power steering according to any one of claims 1 to 3, characterized in that the surface of the rotor and the poles of the stator is made of gear with the same width of teeth and equal subsoil division, the poles of the stator within the phase zones have equal floor the red division, fold subcolony division, the adjacent poles of different phases are shifted relative to each other at a distance that is a multiple of 1/3 subcatego division.



 

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