FIXED MAGNETIC GAP PERMANENT MAGNET SPEED GOVERNOR

Abstract

A fixed magnetic gap permanent magnet speed governor, including a cylindrical conductor rotor and a permanent magnet rotor disposed therein, the permanent magnet rotor includes at least one permanent magnet, two length sides of the permanent magnet are an N pole and an S pole respectively, two magnetic pole end surfaces and two length sides of the permanent magnet are arranged with fixed magnetizers and movable magnetizers respectively, the fixed magnetizers and the movable magnetizers form a closed magnetic loop. Adopting the fixed magnet gap structure improves an engagement area of speed governor and reduces assembling difficulty, saves a rare-earth material, increases a torque transmission capability. The adoption of a magnetic circuit adjustment structure reduces the power consumption of an adjustment execution mechanism, maximally reduces the size of the adjustment execution mechanism, reduces the overall size of the speed governor, reducing material consumption, saving installation space, and facilitating on-site installation.

Claims

1. A fixed magnetic gap permanent magnet speed governor, comprising a cylindrical conductor rotor, and a permanent magnet rotor disposed therein, the permanent magnet rotor is fixed to the driven shaft via a connecting rod, wherein: the permanent magnet rotor comprises at least one permanent magnet, two length sides of the permanent magnet are an N pole and an S pole respectively, two magnetic pole end surfaces and two length sides of the permanent magnet are arranged with fixed magnetizers and movable magnetizers respectively, the fixed magnetizers and the movable magnetizers form a closed magnetic loop surrounding all permanent magnets therein, a magnetic circuit regulator is arranged on the movable magnetizers the magnetic circuit regulator is used to rotate the movable magnetizers, regulate the intensity of magnetic reluctance and thus change the magnetic intensity of permanent magnet externally displayed.

2. The fixed magnetic gap permanent magnet speed governor according to claim 1, wherein the connecting line of two magnetic poles of the permanent magnet is perpendicular to the driven shaft.

3. The fixed magnetic gap permanent magnet speed governor according to claim 1, wherein the connecting line of two magnetic poles of the permanent magnet is parallel to the driven shaft.

4. The fixed magnetic gap permanent magnet speed governor according to claim 1, wherein there is a guide rail installed under the movable magnetizers.

5. The fixed magnetic gap permanent magnet speed governor according to claim 1, wherein the magnetic circuit regulator comprises the regulating actuator used to control the movable magnetizers by receiving control signals.

6. The fixed magnetic gap permanent magnet speed governor according to claim 5, wherein the regulating actuator can be electric actuator, pneumatic actuator or hydraulic actuator.

7. The fixed magnetic gap permanent magnet speed governor according to claim 2, wherein the magnetic circuit regulator comprises the regulating actuator used to control the movable magnetizers by receiving control signals.

8. The fixed magnetic gap permanent magnet speed governor according to claim 3, wherein the magnetic circuit regulator comprises the regulating actuator used to control the movable magnetizers by receiving control signals.

9. The fixed magnetic gap permanent magnet speed governor according to claim 4, wherein the magnetic circuit regulator comprises the regulating actuator used to control the movable magnetizers by receiving control signals.

10. The fixed magnetic gap permanent magnet speed governor according to claim 7, wherein the regulating actuator can be electric actuator, pneumatic actuator or hydraulic actuator.

11. The fixed magnetic gap permanent magnet speed governor according to claim 8, wherein the regulating actuator can be electric actuator, pneumatic actuator or hydraulic actuator.

12. The fixed magnetic gap permanent magnet speed governor according to claim 9, wherein the regulating actuator can be electric actuator, pneumatic actuator or hydraulic actuator.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0013] FIG. 1 is the front section view of closed magnetic loop of Embodiment 1;

[0014] FIG. 2 is the A-A view of Embodiment 1;

[0015] FIG. 3 is the front section view of non-closed magnetic loop of Embodiment 1;

[0016] FIG. 4 is the front section view of closed magnetic loop of Embodiment 2;

[0017] FIG. 5 is the B-B view of Embodiment 2;

[0018] FIG. 6 is the front section view of non-closed magnetic loop of Embodiment 2;

[0019] FIG. 7 is the schematic diagram of the present invention;

[0020] 1. Conductor rotor, 2. Permanent magnet, 3. Driven shaft, 4. Fixed magnetizer, 5. Movable magnetizer, 6. Regulating actuator.

Specific Embodiments

Embodiment 1

[0021] A fixed magnetic gap permanent magnet speed governor, as shown in FIG. 1, FIG. 2 and FIG. 3, comprising a cylindrical conductor rotor 1 and a permanent magnet rotor disposed therein, the permanent magnet rotor is fixed to the driven shaft 3 via a connecting rod, the said permanent magnet rotor comprises four permanent magnets 2 that are circumferentially arranged around the driven shaft, the permanent magnet 2 has an N pole and an S pole at two length sides respectively, the connecting line of two magnetic poles of the said permanent magnet 2 is perpendicular to the driven shaft 3. Two magnetic pole end surfaces and two length sides of the permanent magnet 2 are arranged with fixed magnetizers 4 and movable magnetizers 5 respectively, the fixed magnetizers are an annular magnetic conductor arranged at two end sides of permanent magnet by passing the driven shaft, the movable magnetizers are an annular magnetic conductor arranged at two circumferential surface sides of permanent magnet by passing the driven shaft. The fixed magnetizers 4 and the movable magnetizers 5 comprise a closed magnetic loop surrounding all permanent magnets 2 therein, a guide rail parallel to the driven shaft is installed under the movable magnetizers 5, and there is a magnetic circuit regulator arranged in the movable magnetizers 5, the said magnetic circuit regulator is used to rotate the movable magnetizers 5, adjusting the intensity of magnetic reluctance and thus changing the magnetic intensity of the permanent magnet 2 externally displayed. The said magnetic circuit regulator comprises the regulating actuator 6 controlling the movable magnetizers 5 by receiving control signals. The said regulating actuator 6 can be electric actuator, pneumatic actuator or hydraulic actuator.

Embodiment 2

[0022] A fixed magnetic gap permanent magnet speed governor, as shown in FIG. 4, FIG. 5 and FIG. 6, wherein the connecting line of two poles of the said permanent magnet 2 is parallel to driven shaft 3. Other structures are the same with Embodiment 1.

[0023] As shown in FIG. 7, the principle of the present invention is to change the reluctance intensity of magnetic circuit through rotating the movable magnetizers 5, thus changing the magnetic intensity of the permanent magnet externally displayed.

[0024] It should be finally illustrated that: the aforesaid embodiments are only used to illustrate the technical solutions of the present invention, but not to restrict it. Although detailed illustrations for the present invention have been made based on aforesaid embodiments, common technical staff of corresponding fields should understand that they can still conduct revision or equivalent substitution for concrete embodiments of the present invention, and any revision or equivalent substitution not breaking away from the spirit and scope of the present invention should all be contained amid the claiming scope of the present invention.