CN104034916A - Permanent magnet rotation angle acceleration sensor with unequal magnetic resistance of direct axis and quadrature axis - Google Patents

Abstract

The invention discloses a permanent magnet rotational angular acceleration sensor with unequal direct-axis and quadrature-axis reluctance, which includes a housing, and a horizontal rotating shaft is arranged in the center of the housing, and is characterized in that the outer stator core is installed and fixed on the housing In the body, the output winding is set in the iron core winding slot of the outer stator, and the permanent magnetic steel is embedded in the inner stator iron core. The cup-shaped rotor is fixed and installed between the air gap between the outer stator iron core and the inner stator iron core. Fixed connection, the rotating shaft is installed on the housing through two bearings, the axis of the iron core winding of the outer stator and the magnetic axis of the permanent magnet steel embedded in the inner stator core are orthogonal to each other. Compared with the whole internal stator structure using permanent magnetic steel, the present invention has higher sensitivity, and the output electromotive force corresponds to the rotation acceleration one by one, and the precision is high, and the structure is simple; , the rotational acceleration signal is acquired directly.

Description

A Permanent Magnet Rotational Angular Acceleration Sensor with Different Direct-axis and Quadrature-axis Reluctance

technical field

The invention relates to a sensor, in particular to a permanent magnet rotational angular acceleration sensor with unequal direct-axis and quadrature-axis reluctance.

Background technique

Rotational (angular) acceleration measurement is one of the most common measurements in mechanical quantity measurement. The well-known permanent magnet rotational (angular) acceleration uses permanent magnet steel as a whole in its inner stator. The direct axis reluctance is equal, and the induced potential generated by the rotational angular acceleration in the cup rotor is limited, so the magnetic flux generated by the current generated by the potential will be very small, so the induced potential generated in the output winding will be Very small, the sensitivity of the sensor is very low.

Contents of the invention

The present invention aims at the deficiencies of the prior art, and provides a permanent magnet rotational angular acceleration sensor with unequal direct-axis and quadrature-axis reluctance, which has higher sensitivity, that is, under the same rotational angular acceleration, when the output winding turns are different When the time changes, a larger induced potential can be output in the output winding.

A permanent magnet rotational angular acceleration sensor with unequal direct-axis and quadrature-axis reluctance, including a housing, a base, and a horizontal rotating shaft in the center of the housing, the housing is fixed on the base, and the outer stator core is fixed on the In the casing, the output winding is set in the iron core winding groove of the outer stator, and the permanent magnetic steel is embedded in the inner stator iron core. The cup-shaped rotor is fixed and installed in the air gap between the outer stator iron core and the inner stator iron core. The rotating shaft is fixedly connected, and the rotating shaft is installed on the housing through two bearings. The axis (direct axis) of the output winding of the outer stator and the magnetic axis (orthogonal axis) of the permanent magnet steel embedded in the inner stator core are orthogonal to each other.

Another second form: the permanent magnet steel embedded in the outer stator core, the output winding is arranged in the outer stator core, the axis (direct axis) of the output winding of the outer stator and the magnetic axis of the permanent magnet steel embedded in the outer stator core (orthogonal axes) are perpendicular to each other. A fixed sleeve of non-ferromagnetic material is arranged outside the stator core, and the sleeve is fixed to the base.

Another third form: the permanent magnet steel embedded in the outer stator core, the output winding is arranged in the inner stator core, the axis (direct axis) of the output winding of the inner stator core and the permanent magnet steel embedded in the outer stator core The magnetic axes (orthogonal axes) are perpendicular to each other. A fixed sleeve of non-ferromagnetic material is arranged outside the stator core, and the sleeve is fixed to the base.

The rotating shaft is made of stainless steel, the housing is made of ferromagnetic material, the stator core is made of silicon steel sheet, the output winding is made of copper magnet wire, and the cup-shaped rotor winding is made of copper or aluminum.

Beneficial effects: due to the difference in direct axis and quadrature axis reluctance of the sensor, it has higher sensitivity compared with the entire inner stator structure using permanent magnet steel, and the output electromotive force corresponds to the rotation (angular) acceleration one by one, The precision is high, and the structure is simple; because the sensor is coaxially connected with the transmission system, the rotation (angular) acceleration signal can be obtained directly, so it is easy to use.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of embodiment 1;

Fig. 3 is the structural representation of embodiment 2;

Figure 4 is a schematic structural view of Embodiment 3.

Detailed ways

Embodiment 1, as shown in Fig. 1, Fig. 2, a kind of direct-axis and quadrature-axis reluctance unequal permanent magnet rotational angular acceleration sensor, comprise casing 2, the center of described casing is provided with a horizontal rotating shaft 1, The outer stator core 3 is installed and fixed in the housing 2, the output winding 6 is arranged in the iron core winding slot of the outer stator, the permanent magnetic steel 7 is embedded in the inner stator core 4, and the cup-shaped rotor 5 is fixed and installed between the outer stator core and the inner stator. Between the air gap of the iron core, the cup-shaped rotor is fixedly connected to the rotating shaft through the movable sleeve, and the rotating shaft is installed on the housing through two bearings. The magnetic axes (orthogonal axes) are perpendicular to each other.

Embodiment 2, as shown in Fig. 1, Fig. 3, a kind of direct-axis and quadrature-axis magnetoresistance unequal permanent magnet rotational angular acceleration sensor, comprise housing 2, the center of described housing is provided with a horizontal rotating shaft 1, The outer stator core 3 is provided with a non-ferromagnetic material fixing sleeve 8, which is installed and fixed in the housing 2, the permanent magnetic steel 7 is embedded in the outer stator core 3, the output winding 6 is arranged in the outer stator core 3, and the outer The axis (direct axis) of the output winding in the stator is perpendicular to the magnetic axis (orthogonal axis) of the permanent magnet steel embedded in the outer stator core, and the cup-shaped rotor is fixed and installed in the air gap between the outer stator core and the inner stator core 4 , the cup-shaped rotor 5 is fixedly connected with the rotating shaft 1 through a movable sleeve, and the rotating shaft 1 is installed on the housing 2 through two bearings.

Embodiment 3, as shown in Fig. 1, Fig. 4, a kind of direct-axis and quadrature-axis magnetoresistance unequal permanent magnet rotational angular acceleration sensor, comprise casing 2, the center of described casing is provided with a horizontal rotating shaft 1, The outer stator core 3 is provided with a non-ferromagnetic material fixing sleeve 8, which is installed and fixed in the housing 2, the permanent magnetic steel 7 is embedded in the outer stator core 3, and the output winding 6 is arranged in the inner stator core 4. The axis (straight axis) of the output winding in the inner stator core and the magnetic axis (orthogonal axis) of the permanent magnet embedded in the outer stator core are orthogonal to each other. The cup-shaped rotor is fixed and installed between the air gap between the outer stator core and the inner stator core. The cup-shaped rotor 5 is fixedly connected to the rotating shaft 1 through a movable sleeve, and the rotating shaft 1 is installed on the housing 2 through two bearings.

Its working principle is as follows: Taking Example 1 as an example, the permanent magnet excitation magnet steel is embedded in the inner stator iron core, the output winding is embedded in the outer stator iron core, and the winding axis of the output winding is orthogonal to the magnetic field direction of the permanent magnet steel. An air-gap magnetic field is formed between the two stator cores. The cup-shaped rotor winding is located in the air gap between the inner and outer stator cores and is concentric with the stator. The cup-shaped rotor is connected to the sensor shaft and can rotate relative to the stator. Assuming that the axis of the output winding is the direct axis, the axis of the permanent magnet steel is the quadrature axis. When the magnetic field lines pass through the inner stator, the reluctance in the direction of the direct axis is mainly determined by the reluctance of the ferromagnetic material of the inner stator core, and the magnetic resistance in the direction of the quadrature axis The resistance is mainly determined by the reluctance of the permanent magnet steel in the inner stator, so the reluctance of the direct axis is much smaller than that of the quadrature axis. When working, the sensor shaft is coaxially connected with the transmission shaft of the system under test. If the transmission shaft of the system under test moves at a constant speed, and the cup rotor also moves at a constant speed, then an electric potential is generated in the winding of the cup rotor, which generates a rotor current, and the rotor current generates a magnetic field. At this time, the magnetic field amplitude Constant, the potential of the stator output winding is zero; if the transmission shaft of the system under test moves at a non-constant speed, that is, there is a rotational (angular) acceleration, the cup-shaped rotor also moves at a non-constant speed. Because the excitation magnetic field is constant, the cup-shaped The magnitude of the potential generated in the rotor winding corresponds to the speed of the non-constant speed motion of the system. This potential generates a rotor current, so that a current that changes with time is generated in the cup-shaped rotor. The amplitude of the magnetic field generated by the rotor current also changes with time. The magnetic field whose amplitude of the magnetic potential changes with time is interlinked with the stator output winding, thereby generating an output potential in the stator output winding, which corresponds to the change in the rotational speed of the system. Moreover, since the quadrature-axis reluctance is much larger than the direct-axis reluctance, the induced electromotive force generated in the output winding corresponds to the same number of turns of the output winding and the same magnetic field as compared with the case where the entire inner stator is made of permanent magnet steel. Intensity and the same rotational angular acceleration, the structure with different direct-axis and quadrature-axis reluctance can output a larger output electromotive force, that is, the sensitivity is improved.

Claims (8)

1. A kind of permanent magnet rotational angular acceleration sensor that direct axis and quadrature axis reluctance are not equal, its basic type: comprise housing, the center of described housing is provided with a horizontal rotating shaft, it is characterized in that: outer stator iron core is installed and fixed In the casing, the output winding is set in the iron core winding slot of the outer stator, and the permanent magnetic steel is embedded in the inner stator iron core. The cup-shaped rotor is installed between the air gap between the outer stator iron core and the inner stator iron core. Fixed connection, the rotating shaft is installed on the housing through two bearings, the axis of the output winding of the outer stator and the magnetic axis of the permanent magnet steel embedded in the inner stator core are orthogonal to each other. 2. a kind of direct axis according to claim 1 and the unequal permanent magnet rotational angular acceleration sensor of quadrature axis reluctance, it is characterized in that: described permanent magnetic steel embeds outer stator iron core, and output winding is arranged on outer stator iron core The inner and outer stator cores are provided with non-ferromagnetic material fixing sleeves, which are installed and fixed in the housing. The axis of the output winding of the outer stator and the magnetic axis of the permanent magnet steel embedded in the outer stator core are orthogonal to each other. 3. a kind of direct axis according to claim 1 and the unequal permanent magnet rotational angular acceleration sensor of quadrature axis reluctance, it is characterized in that: described permanent magnetic steel embeds outer stator iron core, and output winding is arranged on inner stator Inside the iron core, there is a non-ferromagnetic material fixing sleeve outside the outer stator core. The sleeve is installed and fixed in the housing. The axis of the output winding of the inner stator core is perpendicular to the magnetic axis of the permanent magnet steel embedded in the outer stator core. 4. a kind of direct axis according to claim 1 and the unequal permanent magnet rotational angular acceleration sensor of reluctance of quadrature axis, it is characterized in that: described rotating shaft adopts stainless steel material to make. 5. a kind of direct axis according to claim 1 and the unequal permanent magnet rotational angular acceleration sensor of quadrature axis reluctance, it is characterized in that: described housing adopts ferromagnetic material to make. 6. a kind of direct axis according to claim 1 and the unequal permanent magnet rotational angular acceleration sensor of reluctance of quadrature axis, it is characterized in that: stator iron core adopts silicon steel sheet. 7. a kind of direct axis according to claim 1 and the unequal permanent magnet rotational angular acceleration sensor of quadrature axis reluctance, it is characterized in that: described output winding adopts copper magnet wire. 8. a kind of permanent magnet rotational angular acceleration sensor that direct axis and quadrature axis reluctance are unequal according to claim 1, is characterized in that: described cup-shaped rotor winding adopts resistivity little copper or aluminum.