KR0164058B1 - Variable damping force actuator - Google Patents

Abstract

The present invention relates to a structure of a damping force variable actuator and a method of determining the stop position of the rotor (23).

The present invention sets the permanent magnet polar ratio of the rotor close to 1 to increase the left amount of the permanent magnet intersecting with the stator 24 iron core to improve the torque and stop position and at the same time the magnetic pole center of the rotor is opposed. There is an advantage in that a strong magnetic field is generated by energizing all three-phase coils around the salient poles and the left and right salient poles to attract permanent magnets.

Description

Actuator for Variable Damping Force

1 is a block diagram of a conventional actuator (drawings of small holes 62-24850).

Figure 2 (a) (b) is a side cross-sectional view and a front cross-sectional view of the actuator applied to the present invention.

3 is a diagram showing the position and mode switching of the actuator for each mode.

4 is a phase current application method for each mode.

(A) and (b) of FIG. 5 show a current application method and a position state in a soft mode state.

6 (a) and 6 (b) show a current application method and a position state in a medium mode state.

7 (a) and 7 (b) are a method of applying current in a hard mode and a positional state diagram.

* Explanation of symbols for main parts of the drawings

11-1, 11-2: Soft mode electromagnet 12-1, 12-2: Medium mode electromagnet

13-1, 13-2: Hard mode electromagnet 14: Output shaft

15: permanent magnet rotor 16: switch

17: battery 21: housing

22: output shaft 23: rotor

24: Stator 25: Cover

26: coil 27: lead wire

28: metal bearing 29: coil support

31: flange portion 32: segment

33: stator fixing projection part 34: recessed part

35: projection 36: concave portion

37: Indentation 38: Grommet

41a, 41b, 42a, 42b, 43a, 43b: stator pole portion

61a, 61b, 62a, 62b, 63a, 63b: coil

51: battery 52: ignition switch

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for variable vehicle damping force, and more particularly, to an actuator suitable for a damping force variable system requiring a fast response and accurate position control by providing a new driving method of the actuator and improving torque and responsiveness.

The actuator for variable vehicle damping force controls the damping force of the shock absorber by switching the flow path area in the shock absorber. Conventionally, the damping force control as an actuator of this type has six protrusions as shown in FIG. The mode switching is performed by energizing a pair of coils corresponding to the permanent magnet stop line among the three-phase coils wound at (11-1, 11-2, 12-1, 12-2, 13-1, 13-2). As a method, there is a problem of poor response position and poor stop position accuracy due to small torque during mode switching. In addition, by adopting the rod-shaped permanent magnet rotor 15, which is extremely low efficiency, the torque generated near the stopping point is not accurate due to the small amount of sustained crossing the stator compared to the actuator of the same size. It caused a problem that can not be.

The present invention has been made to solve the above problems. As shown in FIG. 2, the flow path area in the shock absorber during mode switching is improved by improving the current application method of the actuator, that is, the driving method and improving the generated torque of the actuator. Reduction of responsiveness and stop position inaccuracy caused by frictional resistance and inertia of the valve has been improved, and the permanent magnet pole efficiency is set close to 1 to increase the amount of permanent magnets that intersect the stator cores, increasing the starting torque and stopping position accuracy. Improved.

Actuator according to the present invention is a permanent magnet rotor (23) configured to be rotatable in the housing (21) and the housing. Protruding portions 41a, 41b, 42a, 42b, 43a, 43b are provided on the stator 24 provided in the radial direction on the outer circumference of the rotor, and the number of the protruding portions 41a to 43b is the maximum number of permanent magnets. (61a, 61b, 62a, 62b, 63a, 63b), which is 6 times (N, S pole) and wound on the protrusion pole, to the center of the magnetic pole so that the center of the permanent magnet magnetic pole is opposed to the stop line after the permanent magnet rotation. Mainly focuses on the current conduction switching method and the stator permanent magnet pole efficiency setting which are driven to rotate by rotating the current by generating a magnetic field that attracts permanent magnets by energizing all the three-phase coils wound on opposite poles and left and right poles. do.

For this implementation, the actuator comprises a two-pole permanent magnet rotor 23 fixed to a metal bearing 28 in the center of the housing 1, a stator 24 wound around it, and six stones composed of the stator. The poles 41a to 43b and the coils 61 to 63b wound around the protrusions are respectively shown in FIG. 3 and the switching direction and switching angle of each mode of the actuator are shown in FIG. The method of connecting the coils for each mode is shown in FIGS. 5 (a), 6 (a) and 7 (a).

5 is a diagram showing the stop state and current energization of the actuator in the soft mode, in which switches S1 and S3 are energized in the order of (+) terminal of the battery, and S2 is energized in the order of (-) terminal of the battery.

At this time, the current from the (+) terminal of the battery 51 is divided into coils 61a, 62b and coils 62a, 62b and energized, and this current is energized by coils 63a, 63b combined at the center point and (-) of the battery 51. Flows into the terminal.

6 shows the stop state of the actuator and the current conduction in the medium mode. The switches S1 and S2 are connected to the positive terminal of the battery 51 and the current is connected to the positive terminal and the coil 61a of the battery. 61b, coils 63a and 63b, the switch S3 is connected to the negative terminal of the battery, and current passes through the coils 62b and 62a and the negative terminal of the battery. At this time, the current from the (+) terminal of the battery is divided into coils 61a, 61b and 63a, 63b and energized, and this current is combined at the center point and energized to the coils 63b, 63a and flows to the (-) terminal of the battery.

7 shows the actuator's stop state and current energization in hard mode. Switches S2 are connected to the battery terminals (+) and S1 and S3 are connected to the battery terminals. Terminals, coils 63a, 63b, coils 61b, 61a, coils 62b, 62a, and (-) terminals of batteries are energized in this order. At this time, the current from the positive terminal of the battery is energized to the coils 63a and 63b, and this current is bisected at the center point and is energized to the coils 61b and 61a and the coils 62b and 62a to flow to the negative terminal of the battery.

Although the above embodiment has described the case of three-stage 120 ° switching, another embodiment of the present invention also has a 60 ° switching having a maximum number of 2 and a 12 pole number and a 30 ° switching having a maximum of 4 and a 24 pole number. The same applies.

As described above, the present invention provides a driving method for switching the position by generating a magnetic field that draws a permanent magnet by energizing all three-phase coils wound on the stator 24 of the flow path area switching actuator in the shock absorber. As a driving method that utilizes the coil joint ratio to the maximum, the torque response and position control of the actuator of the same size is preempted, and the permanent magnet pole efficiency is set close to 1 so that the permanent magnet crosses the stator core. Increasing the amount of magnetic flux improves the response characteristics and stop position accuracy.

Claims (2)

A permanent magnet rotor 15 configured to be rotatable in the housing 1, a stator 24 provided radially around the outer periphery of the rotor, coils 26 and 61b wound around the stator, In an actuator in which the number of salient pole portions 41a, 41b, 42a, 42b, 43a, 43b of the stator 24 on which the 62a, 62b, 63a, 63b is wound is six times the number of permanent magnet poles (N, S pole), An actuator for variable damping force, characterized in that the permanent magnet pole effect of the electron (23) is set close to one. 2. The magnetic field according to claim 1, wherein the magnetic field suctions the permanent magnets by passing a current through all three-phase coils around the pole poles and the left and right pole poles opposite the pole poles so that the pole poles face the stop line after the permanent magnet is rotated. Actuator for variable damping force characterized in that the permanent magnet rotor (23) is rotated by generating.