Electromechanical steering booster and steering booster electric motor

FIELD: automotive industry; steering systems of automobiles.

SUBSTANCE: invention is designed for reducing effort on steering wheel. Stator of electric motor is provided with magnetic circuit with n salient poles and rotor, with n-2 poles in form of permanent magnets. Three-phase winding of stator contains coils arranged in six equally alternating phase zones, one coil for pole, several coils belonging to one phase in each phase zone. Winding coils in phase zones belonging to one phase are connected In parallel aiding. Inlet and outlet shafts arranged in booster housing are interconnected by torsion bar being sensitive element of torque sensor and coupled with steering wheel and steering mechanism by other ends. Rotor of electric motor is installed on outlet shaft. Stator winding controllable supply, rotor position pickup and control unit are provided. Inputs of the latter are connected with outputs of torque sensor and rotor position pickup, and output is connected to control input of said supply source. Group if inventions makes it possible to improve manufacturability of electric motor and steering booster as a whole.

EFFECT: improved operating characteristics, safety and comfortability of steering.

5 cl, 3 dwg

 

The group of inventions relates to driving and can be used to effect the reduction of effort on the steering wheel, particularly when manoeuvring at low speeds and turning the wheels when the vehicle is stationary.

Known Electromechanical power steering of a motor vehicle comprising a torque sensor on the steering wheel, the vehicle speed sensor, a control motor connected to these sensors, and controlled by signals from the control unit, the motor associated with the output shaft through the gearbox (EN 2158692, 62 D 5/04, 10.11.2000). The motor in this unit is three phase, the number of teeth on the stator 12, a rotor 8, and the magnetic system of the motor is executed with mutual bevel teeth of the rotor and the stator, and a bevel width of the crowns of teeth of the stator and rotor air gap is selected in a certain ratio from subcatego step on the rotor.

The presence of a known power steering gear complicates the design and increases the weight and dimensions, and also reduces the security control of the vehicle due to jamming of the rudder in case of failure of power steering. Reactive induction motor has fluctuations of the electromagnetic torque on the shaft and has large dimensions and weight.

The closest to the proposed electromagneticcompatibility steering of the car is the power steering, comprising a housing that houses the input and output shafts are interconnected by a torsion bar, which is the sensitive element of the torque sensor, and connected the other ends respectively with the driving and steering mechanism, the motor, the rotor of which is mounted on the output shaft, the driven power source three-phase stator winding of the motor, position sensor rotor of the electric motor and the control unit, the inputs of which are connected to the outputs of the torque sensor and sensor rotor position of the motor, and the output connected to the control input referred power supply (EN 2181091, 62 D 5/4, 10.04.2002).

The closest to the proposed motor is an electric motor containing a stator with a magnetic circuit having n distinct poles and three-phase winding is performed with coils placed in six equal phase alternating zones on one side of the coil on the pole and several coils belonging to one phase, each phase zone, and a rotor with n-2 poles, made in the form of permanent magnets and coils of three-phase stator winding of the motor in phase zones belonging to the same phase are connected in series according to (EN 2181091, 62 D 5/04, 10.04.2002).

The disadvantages of the known power steering and motor appear:

in weak internally is the damping due to the lack of damping contours on the rotor and on the stator of the motor, that may involve the transmission of disturbance torque on the wheel with a sharp impacts with the side of the road on the wheels;

in low-tech manufacturing stator winding of the electric motor and the difficulty of obtaining optimum mechanical characteristics.

These shortcomings due to the fact that at low frequency power and low voltage stator winding of the electric motor has a small number of turns and a large cross-section, which makes it difficult laying in the grooves. Motor for high torque direct drive Electromechanical power steering must be designed to obtain the maximum moment within the specified dimensions with the maximum electromagnetic loads. Given the dimensions of the motor and the magnetic flux view mechanical characteristics (point load and short circuit) is determined by the number of turns of the phase. When a small number of series-connected coils of the phase (which occurs in the known motor-known electronic power steering) have difficulty in obtaining optimum mechanical characteristics due to the large discrete changes in the number of coils in their selection.

The objective of the claimed group of inventions is the removal of the transmission to the wheel outside disturbance torque, as well as to improve the processability manufacturer is of the motor and power steering in General and the improvement of their consumer properties.

The technical result is to increase the safety and comfort of driving.

The problem is solved in that the motor contains a stator with a magnetic circuit having n distinct poles and three-phase winding is performed with coils placed in six equal phase alternating zones on one side of the coil on the pole and several coils belonging to one phase, each phase zone, and a rotor with n-2 poles, made in the form of permanent magnets, coils of three-phase stator winding of the motor in phase zones belonging to the same phase are connected in parallel according to.

The problem is solved also by the fact that a new Electromechanical power steering of a vehicle, comprising a housing that houses the input and output shafts are interconnected by a torsion bar, which is the sensitive element of the torque sensor, and connected the other ends respectively with the driving and steering mechanism, the motor, the rotor of which is mounted on the output shaft, the driven power source three-phase stator winding of the motor, position sensor rotor of the electric motor and the control unit, the inputs of which are connected to the outputs of the torque sensor and sensor rotor position of the motor, and the output connected to the control input upon the type of power source, the electric motor is executed with the above characteristics.

In a further group of inventions is illustrated a specific example of implementation with reference to the drawings on which is shown:

Figure 1 - proposed Electromechanical power steering, the incision;

Figure 2 is a cross section of the proposed motor;

Figure 3 - connection of the coils of the poles.

The composition of the Electromechanical power steering of a vehicle includes a housing 1 (Fig 1), input 2 and output 3 shafts interconnected by a torsion bar 4, which is the sensitive element of the sensor 5 moment measure is applied to the steering wheel torque and generates corresponding output signals. There is also the electric motor 6, the rotor of which is mounted on the output shaft 3, a controlled power source three-phase stator winding of the motor (not shown in figure 1), the sensor 7 position of the rotor of the electric motor and the control unit (not shown in figure 1). A control unit connected to the outputs of the sensor 5 and the sensor 7 position of the rotor of the electric motor 6, and the output connected to the control input of the above-mentioned power source.

The motor 6 consists of a stator with a magnetic core 8 and the rotor 9 (2)installed, as already mentioned, on the output shaft 3 of the power steering.

The motor 6 is three-phase. The stator wipunen with salient poles 11, which are the coil 12 to the one on the pole. The rotor 9 is made of a multipolar with excitation from permanent magnets 13. The number of stator poles 11 are different from the number of rotor poles by two.

Position sensor rotor 7 is composed of 3 Hall sensors that are offset relative to each other at 120 e. degrees and fixing the angular position of the rotor magnetic fluxes scattering of the rotor 9, created by the permanent magnets 13.

The coils of the stator 10, beginning with a, b and C and all X, Y and Z (figure 3) placed in six-phase zones. In each phase zone are somewhat connected in parallel according coils belonging to one phase.

The magnetic circuit of the stator 8 is a housing combined with the body 1) power steering.

The torsion bar 4 sensor 5 can be located inside the hollow output shaft 3 or the hollow input shaft 2.

The proposed Electromechanical power steering and the motor 6 are as follows.

When the signal at the sensor 5 torque control motor 6 generates the power control signal applied to windings of the motor 6, to create a steering mechanism required compensating moment. Thus the value of the signal on the coil 12 is formed in accordance with the signals from the sensor 7 of the rotor position. In the control unit of the electric motor 6 in the accordance with the reference signal generated current is sinusoidal, which, flowing through windings 12 of the stator 10, creates electromagnetic torque, is applied directly to the output shaft 3 of the power steering.

The use of the sockets winding 12 with the inclusion of the coils in phase zone in parallel according enables you to simplify the design of the motor 6, as well as to improve the weight and dimensions of the electric motor 6 and the power steering in General due to more precise adjustment of the number of turns of the phase. For example, to perform the winding with the number of turns in the coil, 5.3 engine with three series-connected coils in phase zone, it is impossible in principle, and in their parallel operation can be performed, the number of turns in the coil is equal to 16, which is equivalent to 5.3 sequential inclusion.

Parallel connected coils in phase zone during rotation of the rotor 9 caps of different sizes electromotive force that causes a surge of current in the winding 12. For this reason, in conventional machines such inclusion in principle is not applied. The engine is similar to the Electromechanical power steering is working at very low speeds (up to 2 Rev/s). At these low frequencies of rotation of the induced EMF in the windings is small, and the surge current in nominal modes is small, since the applied voltage is mainly balanced by the voltage drop across the active impedance the attachment of the winding 12 of the stator 10. In transient mode with a sharp impacts from the wheels on the rotor shaft 9 of the instantaneous value of the EMF in the coils increase dramatically, resulting in significant surge currents in the coils of phase zones, which create opposing moments contributing to the damping of perturbations of the wheels.

Thus, the connection of the coils of the stator 10 of the motor 6 in each phase zone belonging to the same phase, parallel - according distinguishes this group of inventions from the closest analogue, as it allows to exclude the transfer to the outside wheel disturbance torque, significantly improve the manufacturability of the motor and the power steering in General and to improve their consumer properties. Ultimately with the use of this group of inventions is improving the safety and comfort of driving.

1. The motor contains a stator with a magnetic circuit having n distinct poles and three-phase winding is performed with coils placed in six equal phase alternating zones on one side of the coil on the pole and several coils belonging to one phase, each phase zone, and a rotor with n-2 poles, made in the form of permanent magnets, wherein the three-phase coil of the stator winding of elektrodvigatel the phase I areas, belonging to the same phase are connected in parallel according to.

2. Electromechanical power steering of a vehicle, comprising a housing that houses the input and output shafts are interconnected by a torsion bar, which is the sensitive element of the torque sensor, and connected the other ends respectively with the driving and steering mechanism, the motor, the rotor of which is mounted on the output shaft, the driven power source three-phase stator winding of the motor, position sensor rotor of the electric motor and the control unit, the inputs of which are connected to the outputs of the torque sensor and sensor rotor position of the motor, and the output connected to the control input of the above-mentioned power source, characterized in that the motor made according to according to claim 1 of the formula.

3. Electromechanical power steering vehicle according to claim 2, in which the magnetic core of the stator of the motor is the housing of the power steering.

4. Electromechanical power steering vehicle according to claim 2 or 3, in which the torsion torque sensor is located inside the hollow output shaft.

5. Electromechanical power steering vehicle according to claim 2 or 3, in which the torsion torque sensor is located inside the hollow input shaft.



 

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FIELD: transport engineering; automotive and tractor industry.

SUBSTANCE: proposed steering column includes steering wheel. Ignition lock, input shaft on which steering wheel is installed, output shaft mechanically connected with vehicle wheels and torsion bar arranged coaxially with input shaft and connected with input and output shafts and installed so that when torque is applied to input shaft, torsion bar is twisted. Column contains also electric motor coupled with output shaft and provided with rotor, stator and housing, and control unit generating and supplying control signals, depending of angle of twisting of torsion bar, to electric motor which conveys additional torque to output shaft. Rotor of electric metro is installed on output shaft, and housing of electric motor is made to provide coaxial arrangement of input and output shafts. Torsion bar is furnished with torsion bar twisting angle limiter. Control unit is made for generating control signals depending additional on temperature of electric motor stator. Control unit contains control device generating control signals of steering column electric motor furnished with steering column shaft torque pickup. Said control device is made in from of microcontroller furnished additionally with electric motor stator temperature pickup being connected with semiconductor electric energy converter forming steering column electric motor current whose value is determined by said motor control signals.

EFFECT: provision of compact power- saving steering column with increased service life.

30 cl, 6 dwg

FIELD: transport engineering; automotive industry.

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EFFECT: compact design, energy saving, reliable steering column providing ease of steering.

7 cl, 2 dwg

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EFFECT: provision of stepless connection of drive to output part of steering shaft, improved reliability of steering booster.

6 cl, 1 dwg

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6 cl, 1 dwg

FIELD: transport engineering; automotive industry.

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7 cl, 2 dwg

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EFFECT: provision of compact power- saving steering column with increased service life.

30 cl, 6 dwg

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