CN101042149A - Hydraulic power system controlled by servo electric machine - Google Patents

Abstract

It relates to a servo motor control hydraulic power system that comprises the data collection and processing, displacement sensor, pressure sensor, oil pump, execution mechanism, displacement sensor, pressure sensor, with the oil pump connecting with the execution structure, controlling and executing the data collection and processing, connecting with the displacement sensor, pressure sensor, servo motor and the oil pump connected with the servo generator. Using the said structure, it can reasonably distribute the pressure and flow based on the working requirement, with reduced power consumption, and improved working efficiency.

Description

Hydraulic power system with actuating motor control

Technical field

The invention discloses a kind of hydraulic power system, be applied on the machinery, belong to the hydraulic power system technical field with actuating motor control.

Background technique

At present, the common electric machine drive oil pump that is generally that hydraulic power system adopted of commercial Application provides hydraulic power supply, its working principle: as shown in Figure 1, common electric machine 2 ' drives oil pump 3 ' and moves with rated speed, pressure transducer 9 ' sends a signal to computer 1 ' when actuator 5 ' need be under certain pressure moves by certain speed, send pressure controling signal to proportional pressure control valve 8 ' by computer 1 ', proportional pressure control valve 8 ' adjust system working pressure; Displacement transducer 6 ' sends a signal to computer 1 ', send a signal to proportional flow control valve 7 ' by computer 1 ', proportional flow control valve 7 ' distributes the pressure that oil pump 3 ' provides, a part of pressure oil offers actuator 5 ', make it to satisfy the displacement of actuator 5 ', the needs of speed, unnecessary pressure oil flows back to fuel tank through proportional pressure control valve 8 ', and the flow of this system and pressure need passing ratio Flow valve 7 ' and proportional pressure control valve 8 ' to adjust.

The electrical consumption power of above-mentioned hydraulic power system is:

P＝p×Q

Q＝n×q

P in the formula---power (w)

P---system pressure (Pa)

Q---flow (m ³/ s)

N---motor speed (r/s)

Q---oil pump capacity (m ³/ r)

Because motor moves with rated speed in this system, so its consumed power is

P＝p×n×q

Because n * q is constant in this system, so electrical consumption power is only relevant with system pressure, when system pressure is determined, no matter actuator's motion speed speed does not all change power consumption, when just needing low cruise or pressurize in actuator, the merit major part of electrical consumption is a lost work, these lost work major parts are converted into heat energy and flow back to fuel tank by pressure oil through proportional pressure control valve, cause system's heating, under many occasions, particularly cooling system is installed, thereby capacity usage ratio is low when causing moving, and has increased cost next need of the very big operating mode of high pressure and velocity variations.

Summary of the invention

For addressing the above problem, it is a kind of simple in structure that the object of the invention is to provide, the efficient height, and cost is low, and power loss is little, by the hydraulic power system with actuating motor control of job requirement reasonable distribution pressure and flow.

The present invention will solve the technological scheme that its technical problem adopts: a kind of hydraulic power system with actuating motor control, comprise data acquisition and processing (DAP) device, displacement transducer, pressure transducer, oil pump, actuator, displacement transducer, pressure transducer, oil pump link to each other with actuator respectively, being used for the data acquisition and processing (DAP) device of control executing mechanism links to each other with displacement transducer, pressure transducer respectively, it is characterized in that: also comprise actuating motor, actuating motor links to each other with the data acquisition and processing (DAP) device, and oil pump links to each other with actuating motor.

Of the present inventionly further be set to: described actuating motor comprises magneto, speed device, servo driver, servo driver links to each other with the data acquisition and processing (DAP) device, magneto links to each other with servo driver, speed device and magneto are made as one, and magneto is connected with oil pump.

Of the present inventionly further be set to: described actuator is oil hydraulic cylinder or oil hydraulic motor.

Of the present inventionly further be set to: the data acquisition and processing (DAP) device comprises computer and nonshared control unit.

After the present invention adopts said structure, torque that produces when working by actuating motor and rotating speed reach the pressure of control native system and the purpose of flow, its torque can guarantee the needs of native system pressure, and rotating speed can guarantee the needs of native system flow, and its formula is as follows:

①P＝p×Q

②Q＝n×q

③ $\mathrm{Tw}=\frac{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="A20071006807400081.png,A20071006807400091.png"\; state="\{\{state\}\}">P</figure-callout>}}{2\mathrm{\&pi;}\&times;W}$

P in the formula---power (w)

P---system pressure (Pa)

Q---flow (m ³/ s)

Tw---torque (N.m)

N---motor speed (r/s)

Q---oil pump capacity (m ³/ r)

By 1. 2. 3. as can be known

$\mathrm{Tw}=\frac{\mathrm{<figure-callout\; id="2"\; label="q"\; filenames="A20071006807400081.png,A20071006807400091.png"\; state="\{\{state\}\}">q</figure-callout>}}{2\mathrm{\&pi;}}\&times;p,$ Because

Be constant, so the torque of actuating motor is directly proportional with system pressure.

And according to Q=n * q, the rotating speed of actuating motor is directly proportional with the flow of system as can be known.Because actuating motor can be adjusted its torque, rotating speed in real time, speed of response is the ms level, so can satisfy the requirement of this system fully.

Oil pump flow of the present invention can dynamically be adjusted by actuating motor, the required flow of system equals oil pump flow, therefore actuating motor institute work is applied in the system works fully, especially when the high pressure low cruise, actuating motor moves with very low rotating speed with certain torque, power loss is little, has improved working efficiency.

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.

Description of drawings

Fig. 1 is a kind of fundamental diagram of hydraulic power system;

Fig. 2 is a fundamental diagram of the present invention.

Embodiment

As shown in Figure 2, the present invention includes data acquisition and processing (DAP) device 1, actuating motor 2, magneto 21, speed device 22, servo driver 23, oil pump 3, actuator 4, displacement transducer 5, pressure transducer 6, fuel tank 7.Displacement transducer 5, pressure transducer 6, oil pump 3 link to each other with actuator 4 respectively, being used for the data acquisition and processing (DAP) device 1 of control executing mechanism 4 links to each other with displacement transducer 5, pressure transducer 6, actuating motor 2 respectively, actuating motor 2 comprises magneto 21, speed device 22, servo driver 23, servo driver 23 links to each other with data acquisition and processing (DAP) device 1, magneto 21 links to each other with servo driver 23, speed device 22 is made as one with magneto 21, magneto 21 is connected with oil pump 3, and fuel tank 7 links to each other with oil pump 3, actuator 4 respectively.Actuator 4 is oil hydraulic cylinder or oil hydraulic motor.Data acquisition and processing (DAP) device 1 comprises computer and nonshared control unit.

Working principle of the present invention: data acquisition and processing (DAP) device 1 outputs signal to actuating motor 2 by job requirement, make actuating motor 2 in the middle of work, produce certain torque, rotating speed, drive oil pump 3, oil pump 3 sucks hydraulic oil from fuel tank 7, and hydraulic oil is input in the actuator 4, make actuator's 4 work, when actuator 4 need be under certain pressure moves with certain speed, pressure transducer 6 sends pressure signal to data acquisition and processing (DAP) device 1, data acquisition and processing (DAP) device 1 is given 2 one dtc signals of actuating motor by computing, rate signal of speed device 22 common transmissions in displacement transducer 5 and the actuating motor 2 is to actuating motor 2, data acquisition and processing (DAP) device 1 is given 2 one tach signals of actuating motor by computing, actuating motor 2 is dynamically adjusted the torque and the rotating speed of actuating motor 2 according to dtc signal and rate signal, drive oil pump 3, pass to actuator 4 required pressure and flow.

Claims (5)

1, a kind of hydraulic power system with actuating motor control, comprise data acquisition and processing (DAP) device (1), displacement transducer (5), pressure transducer (6), oil pump (3), actuator (4), displacement transducer (5), pressure transducer (6), oil pump (3) links to each other with actuator (4) respectively, be used for control executing mechanism (4) data acquisition and processing (DAP) device (1) respectively with displacement transducer (5), pressure transducer (6) links to each other, it is characterized in that: also comprise actuating motor (2), actuating motor (2) links to each other with data acquisition and processing (DAP) device (1), and oil pump (3) links to each other with actuating motor (2).

2, the hydraulic power system with actuating motor control according to claim 1, it is characterized in that: described actuating motor (2) comprises magneto (21), speed device (22), servo driver (23), servo driver (23) links to each other with data acquisition and processing (DAP) device (1), magneto (21) links to each other with servo driver (23), speed device (22) is made as one with magneto (21), and magneto (21) is connected with oil pump (3).

3, the hydraulic power system with actuating motor control according to claim 1 is characterized in that: described actuator (4) is oil hydraulic cylinder.

4, the hydraulic power system with actuating motor control according to claim 1 is characterized in that: described actuator (4) is oil hydraulic motor.

5, the hydraulic power system with actuating motor control according to claim 1 and 2, it is characterized in that: data acquisition and processing (DAP) device (1) comprises computer and nonshared control unit.

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