CN107588175B - Differential planet gear parallel connection four-quadrant motor high-power energy saving speed-regulating system and method - Google Patents

Abstract

The invention discloses a kind of differential planet gear parallel connection four-quadrant motor high-power energy saving speed-regulating system and methods, including differential planet gear, four-quadrant motor, four-quadrant inverter, driving motor and load；Differential planet gear includes drive bevel gear, differential internal bevel gear group, dynamic bevel gear and differential external gear；Differential internal bevel gear group includes several internal bevel gears, and each internal bevel gear is arranged on the inner peripheral surface of differential external gear；Each internal bevel gear is meshed with drive bevel gear and dynamic bevel gear；Drive bevel gear is connected with driving motor, and dynamic bevel gear is connected with load；Differential external gear is engaged with the motor gear in four-quadrant motor；One end of four-quadrant inverter is connected with four-quadrant motor, and the other end of four-quadrant inverter is connected with power grid, and power grid is also connected with driving motor.The present invention is without slip loss, the standby functions being able to achieve under lifting speed speed regulation, realization load fast braking and driving motor malfunction.

Description

High-power energy-saving speed regulation system and method of differential planetary gear parallel four-quadrant motor

technical field

The invention relates to a speed regulation system and method, in particular to a high-power energy-saving speed regulation system and method of a differential planetary gear parallel four-quadrant motor.

Background technique

The existing energy-saving speed regulation systems mainly include frequency conversion speed regulation, liquid couple speed regulation, permanent magnet speed regulation and planetary gear speed regulation. However, the above speed control system still has the following problems:

1. The frequency conversion speed regulation is electronic speed regulation, which has higher requirements on the environment and higher cost in the high-power (MW-level) transmission system.

2. The speed regulation of the liquid couple is hydraulic speed regulation, which is similar to the permanent magnet speed regulation and the planetary gear speed regulation, both of which belong to the speed regulation of the transmission system. Among them, hydraulic speed regulation and permanent magnet speed regulation are stepless speed regulation systems, but there is slip loss. The planetary gear speed regulation is step-by-step speed regulation, and the speed regulation range is limited.

Therefore, through the analysis of the existing speed regulating mechanism, the following technical problems need to be solved urgently:

1. Provide a stepless speed regulating mechanism without slip loss based on the transmission system.

2. Compared with the existing speed regulating mechanism, the mechanism should not only realize the purpose of speed reduction and speed regulation, but also be able to realize the speed increase and speed regulation of the system under special circumstances, and has the ability of overload operation.

3. Compared with the existing speed regulating mechanism, the mechanism should be able to realize the function of fast braking of the load.

4. Compared with the existing speed regulating mechanism, the mechanism should be able to realize the backup function under the fault state of the drive motor.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to aim at the above-mentioned deficiencies of the prior art, and to provide a high-power energy-saving speed regulation system for a four-quadrant motor connected in parallel with differential planetary gears. There is no slip loss, and it can realize the speed regulation of speed increase and decrease, realize the rapid braking of the load and the backup function under the fault state of the drive motor.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A differential planetary gear parallel four-quadrant motor high-power energy-saving speed regulation system includes a differential planetary gear, a four-quadrant motor, a four-quadrant inverter, a drive motor and a load.

The differential planetary gear includes a driving bevel gear, a differential inner bevel gear set, a driven bevel gear and a differential outer gear.

The differential inner bevel gear set includes several inner bevel gears, and each inner bevel gear is arranged on the inner circumferential surface of the differential outer gear.

Each inner bevel gear meshes with a driving bevel gear and a driven bevel gear.

The driving bevel gear is connected with the drive motor, and the passive bevel gear is connected with the load.

The differential external gear meshes with the motor gear in the four-quadrant motor.

One end of the four-quadrant inverter is connected with the four-quadrant motor, and the other end of the four-quadrant inverter is connected with the power grid, and the power grid is also connected with the driving motor.

The differential external gear is a conical differential external bevel gear, and the motor gear is a conical motor bevel gear.

It also includes a driving shaft, the driving bevel gear is fixedly sleeved on one end of the driving shaft, and the other end of the driving shaft is connected with the driving motor.

It also includes a passive shaft, the passive bevel gear is fixedly sleeved on one end of the passive shaft, and the other end of the passive shaft is connected with the load.

It also includes a connecting rod, each inner bevel gear is arranged on the inner circumferential surface of the differential external gear through the connecting rod, and each inner bevel gear can use the connecting rod as a rotation axis to realize self-rotation.

The present invention also provides a high-power energy-saving speed regulation method for a four-quadrant motor connected in parallel with differential planetary gears. Quick braking and backup function in case of drive motor failure.

A method for high-power energy-saving speed regulation of a four-quadrant operating motor in parallel with differential planetary gears, comprising the following steps:

Step 1, speed setting: the drive motor drives the drive bevel gear to rotate, assuming that the speed of the drive bevel gear or the drive shaft is n1, assuming that the speed of the passive bevel gear or driven shaft connected to the load is n2, the motor gear in the four-quadrant motor is The speed is n3.

Step 2, through the reasonable adjustment and control of the speeds n1, n2 and n3, the functions of full torque transmission, power generation feedback, load speed increase adjustment, load stall protection and load feedback braking can be realized; the specific control of the speeds n1, n2 and n3 Methods as below.

Step 21, full torque transmission: make the rotation speed of the motor gear in the four-quadrant motor n3=0, then n1=n2, the torque of the driving motor can be fully transmitted to the load.

Step 22, power generation feedback: make n1=n2+2*n3, the four-quadrant motor is in the power-generating state, that is, by changing the power output of the four-quadrant motor, the torque on the motor gear is controlled, and the difference between the differential external gear and the passive bevel gear is changed. The torque distribution between the four-quadrant motors realizes load deceleration and energy saving, and the four-quadrant motor generates and feeds back electric energy.

Step 23, load acceleration adjustment: make n1+2*n3=n2, the four-quadrant motor is in the electric state, that is, by changing the electric energy input of the four-quadrant motor, control the torque on the motor gear, change the differential external gear and the passive cone The torque distribution between the gears realizes the function of increasing the load.

Step 24, load locked rotor protection: when the load is locked, n1=2*n3, then the electric energy output of the driving motor is completely recovered by the four-quadrant motor, so as to realize the protection under the load locked rotor state.

Step 25, load feedback braking: make n2=2*n3, the drive motor has no input, the four-quadrant motor is in the power generation state, and the residual energy of the load is recovered by the four-quadrant motor to realize the feedback braking of the load and stop quickly.

In the step 25, when n2=2*n3 and the drive motor has no input or the drive motor is faulty, the four-quadrant motor is in a power generation state. At this time, the four-quadrant motor can be used as a motor to drive the load.

The invention has the following beneficial effects: by adjusting the working state of the four-quadrant motor, adjusting the torque on the differential external gear, realizing the torque distribution between the four-quadrant motor and the load through the differential planetary gear, and adjusting the energy output of the load system. In addition, the present invention is a stepless speed regulating mechanism without slip loss based on the transmission system; it can realize the purpose of speed reduction and speed regulation, and can also realize the speed increase and speed regulation of the system under special circumstances, and the overload operation capability; Load quick braking function; can realize the backup function in the state of drive motor failure.

Description of drawings

FIG. 1 shows a schematic diagram of the high-power energy-saving speed regulation system of the differential planetary gear parallel four-quadrant motor in Example 1.

FIG. 2 shows a schematic diagram of the differential planetary gear in Embodiment 1. FIG.

FIG. 3 shows a schematic diagram of the connection between the differential external gear and the motor gear in Embodiment 1. FIG.

FIG. 4 shows a schematic diagram of the high-power energy-saving speed regulation system of the differential planetary gear paralleled four-quadrant motor in the second embodiment.

5 shows a schematic diagram of the connection between the differential outer bevel gear and the motor bevel gear in Embodiment 2.

Including:

1. Differential planetary gear;

11. Drive shaft; 12. Drive bevel gear; 13. Differential inner bevel gear; 14. Driven bevel gear; 15. Driven shaft; 16. Differential external gear; 17. Connecting rod; 18. Differential external bevel gear;

2. Four-quadrant motor; 21. Motor gear; 22. Motor bevel gear;

3. Sixiang inverter;

4. Drive motor;

5. Load.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific preferred embodiments.

Example 1

As shown in FIG. 1 , a high-power energy-saving speed regulation system of a four-quadrant motor in parallel with a differential planetary gear includes a differential planetary gear 1 , a four-quadrant motor 2 , a four-quadrant inverter 3 , a drive motor 4 and a load 5 .

As shown in FIG. 2 , the differential planetary gear includes a driving shaft 11 , a driving bevel gear 12 , a differential inner bevel gear set, a driven bevel gear 14 , a driven shaft 15 and a differential outer gear 16 .

The differential inner bevel gear set includes several inner bevel gears 13. As shown in FIG. 3, each inner bevel gear is preferably arranged on the inner circumferential surface of the differential outer gear through the connecting rod 17, and each inner bevel gear can The rotation is realized by using the connecting rod as the rotation axis.

Each inner bevel gear meshes with a driving bevel gear and a driven bevel gear.

The driving bevel gear is preferably connected with the driving motor through the driving shaft, that is, the driving bevel gear is preferably fixedly sleeved on one end of the driving shaft, and the other end of the driving shaft is preferably connected with the driving motor.

The driven bevel gear is preferably connected with the load through the driven shaft, that is, the driven bevel gear is preferably fixedly sleeved on one end of the driven shaft, and the other end of the driven shaft is preferably connected with the load.

The differential external gear meshes with the motor gear 21 in the four-quadrant motor, so the differential internal bevel gear can revolve with the differential external gear.

In this embodiment, the differential external gear and the motor gear are both circular structures.

One end of the four-quadrant inverter is connected with the four-quadrant motor, and the other end of the four-quadrant inverter is connected with the power grid, and the power grid is also connected with the driving motor.

A method for high-power energy-saving speed regulation of a four-quadrant operating motor in parallel with differential planetary gears, comprising the following steps:

Step 1, speed setting: the drive motor drives the drive bevel gear to rotate, assuming that the speed of the drive bevel gear or the drive shaft is n1, assuming that the speed of the passive bevel gear or driven shaft connected to the load is n2, the motor gear in the four-quadrant motor is The speed is n3.

In step 2, through the reasonable adjustment and control of the rotational speeds n1, n2 and n3, the functions of full torque transmission, power generation feedback, load acceleration adjustment, load stall protection and load feedback braking can be realized.

The specific control methods of the rotational speeds n1, n2 and n3 are as follows.

Step 21, full torque transmission: make the speed of the motor gear in the four-quadrant motor n3=0, then n1=n2, the torque of the driving motor can be completely transmitted to the load, so there is no slip loss.

Step 22, power generation feedback: make n1=n2+2*n3, the four-quadrant motor is in the power-generating state, that is, by changing the power output of the four-quadrant motor, the torque on the motor gear is controlled, and the difference between the differential external gear and the passive bevel gear is changed. The torque distribution between the four-quadrant motors realizes load deceleration and energy saving, and the four-quadrant motor generates and feeds back electric energy.

Step 23, load acceleration adjustment: make n1+2*n3=n2, the four-quadrant motor is in the electric state, that is, by changing the electric energy input of the four-quadrant motor, control the torque on the motor gear, change the differential external gear and the passive cone The torque distribution between the gears realizes the function of increasing the load.

Step 24, load locked rotor protection: when the load is locked, n1=2*n3, then the electric energy output of the driving motor is completely recovered by the four-quadrant motor, so as to realize the protection under the load locked rotor state.

Step 25, load feedback braking: make n2=2*n3, the drive motor has no input, the four-quadrant motor is in the power generation state, and the residual energy of the load is recovered by the four-quadrant motor to realize the feedback braking of the load and stop quickly.

In this step 25, when n2=2*n3, when the drive motor has no input or the drive motor is faulty, the four-quadrant motor is in a power generation state, and at this time, the four-quadrant motor can be used as a motor drive load.

Example 2

As shown in FIG. 4 and FIG. 5 , the above-mentioned differential external gear is a tapered differential external bevel gear 18 , the motor gear is a tapered motor bevel gear 22 , and the rest are the same as in Embodiment 1.

The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention. These equivalent transformations All belong to the protection scope of the present invention.

Claims (7)

1. a differential planetary gear parallel four-quadrant operating motor high-power energy-saving speed regulation system is characterized in that: comprising differential planetary gear, four-quadrant motor, four-quadrant inverter, drive motor and load; The differential planetary gear includes a driving bevel gear, a differential inner bevel gear set, a driven bevel gear and a differential outer gear; The differential inner bevel gear set includes several inner bevel gears, and each inner bevel gear is arranged on the inner circumferential surface of the differential outer gear; Each inner bevel gear meshes with the driving bevel gear and the driven bevel gear; The driving bevel gear is connected with the drive motor, and the passive bevel gear is connected with the load; The differential external gear meshes with the motor gear in the four-quadrant motor; One end of the four-quadrant inverter is connected with the four-quadrant motor, and the other end of the four-quadrant inverter is connected with the power grid, and the power grid is also connected with the driving motor. 2. The high-power energy-saving speed control system for a parallel four-quadrant operation motor with differential planetary gears according to claim 1, wherein the differential external gear is a conical differential external bevel gear, and the motor gear is a conical motor bevel gear. 3. The differential planetary gear parallel four-quadrant running motor high-power energy-saving speed regulation system according to claim 1, characterized in that: further comprising a driving shaft, the driving bevel gear is fixedly sleeved on one end of the driving shaft, and the other end of the driving shaft is connected to the drive motor. 4. The high-power energy-saving speed regulation system of a parallel four-quadrant operating motor with differential planetary gears according to claim 1, characterized in that: it further comprises a passive shaft, the passive bevel gear is fixedly sleeved on one end of the passive shaft, and the other end of the passive shaft is connected to the load. 5. The high-power energy-saving speed control system for parallel four-quadrant operation motor of differential planetary gears according to claim 1, characterized in that: it further comprises a connecting rod, and each inner bevel gear is arranged on the differential outer gear through the connecting rod. On the inner circumferential surface, each inner bevel gear can rotate with the connecting rod as the rotation axis. 6. A high-power energy-saving speed regulation method for a parallel four-quadrant operation motor of differential planetary gears according to any one of claims 1-5, characterized in that: comprising the steps of: Step 1, speed setting: the drive motor drives the drive bevel gear to rotate, assuming that the speed of the drive bevel gear or the drive shaft is n1, assuming that the speed of the passive bevel gear or driven shaft connected to the load is n2, the motor gear in the four-quadrant motor is The speed is n3; Step 2, through the reasonable adjustment and control of the speeds n1, n2 and n3, the functions of full torque transmission, power generation feedback, load speed increase adjustment, load stall protection and load feedback braking can be realized; the specific control of the speeds n1, n2 and n3 Methods as below: Step 21, full torque transmission: make the speed n3=0 of the motor gear in the four-quadrant motor, then n1=n2, the torque of the driving motor can be fully transmitted to the load; Step 22, power generation feedback: make n1=n2+2*n3, the four-quadrant motor is in the power-generating state, that is, by changing the power output of the four-quadrant motor, the torque on the motor gear is controlled, and the difference between the differential external gear and the passive bevel gear is changed. The torque distribution between the four-quadrant motors realizes the load deceleration and energy saving, and the four-quadrant motor generates and feeds back electric energy; Step 23, load acceleration adjustment: make n1+2*n3=n2, the four-quadrant motor is in the electric state, that is, by changing the electric energy input of the four-quadrant motor, control the torque on the motor gear, change the differential external gear and the passive cone Torque distribution between gears to achieve load increasing function; Step 24, load lock protection: when the load is locked, make n1=2*n3, then the electric energy output of the driving motor is completely recovered by the four-quadrant motor, so as to realize the protection under the load lock state; Step 25, load feedback braking: make n2=2*n3, the drive motor has no input, the four-quadrant motor is in the power generation state, and the residual energy of the load is recovered by the four-quadrant motor to realize the feedback braking of the load and stop quickly. 7. The method for high-power energy-saving speed regulation of a four-quadrant operating motor in parallel with differential planetary gears according to claim 6, wherein in the step 25, when n2=2*n3, the drive motor has no input or the drive motor is faulty When the four-quadrant motor is in the electric state, at this time, the four-quadrant motor can be used as a motor to drive the load.