Magneto-rheological fluid soft starting device

Abstract

The invention discloses a magneto-rheological fluid soft starter, comprising a driving flange disc integrated with a driving axle by connection. A plurality of concentric driving rings are fixedly connected with the driving flange disc; the driving ring is coated with a plurality of concentric driven rings; a clearance filled with magneto-rheological fluid used as power-transmission medium is arranged between the driven ring and the driving ring; the driven ring is connected with a driven shaft, a driven flange and a right end-cap, and a locating shaft is arranged between the driving shaft and the driven shaft to ensure that the driving shaft and the driven shaft are concentric; an exciting coil and a power-receiving device are arranged on the driven shaft, and the exciting coil receives external DC power supply through the power-receiving device. The device can achieve fan radiation by self-rotation, the structure is simple, the volume is small, the power-transmission torque is big, the radiation performance is relatively sound, the service life is long, and the device has an extensive application scope.

Description

technical field [0001] The invention relates to a magneto-rheological fluid soft start device, which is especially suitable for the controllable start of high-power equipment, and also suitable for adjusting the power distribution when a plurality of motors drive a single equipment, and also suitable for the overload protection of mechanisms. Background technique [0002] The mechanical device is generally started by direct power-on, and it is easy to generate mechanical shock when starting, which has a great impact on the life of the mechanical device. At the same time, the starting current is 6 to 8 times the rated operating current, resulting in excessive load on the power supply system. A common soft start device is a hydraulic coupling, but since it must have a slip when it works, the efficiency is not higher than 97%, and the motor starting current is also relatively large. U.S. Patent US005896965, Magnetorheological fluidfan clutch (magnetorheological sector clutch), ...

AI Technical Summary

Problems solved by technology

[0002] The mechanical device is generally started by direct power-on, which is very easy to produce mechanical shock when starting, which has a great impact on the life of the mechanical device. At the same time, the starting current is 6 to 8 times the rated operating current, resulting in excessive load on the power supply system.

A common soft start device is a hydraulic coupler, but because it must have a slip when it works, its efficiency is not higher than 97%, and the starting current of the motor is also relatively large

U.S. Patent US005896965, Magnetorheological fluidfan clutch (magnetorheological sector clutch), announced a magnetorheological single disc clutch, which introduces a new smart material magnetorheological fluid as a power transmission medium, and changes its flow through the magnetic field generated by the electromagnetic coil. Variable characteristics, can control the transmitted torque, the disadvantage is that it can only be used to transmit small torque occasions

However, the coupling described in this patent is only a schematic diagram and does not address important product issues, such as reducing non-working air gaps between different components containing magnetic field flux lines, or providing a coupling with both sufficient magnetic field strength and A device with sufficient heat transfer capability to avoid fluid overheating and boiling

U.S. Patent US6811007B2, Hydromechanical Coupling with Clutch Assembly and Magnetorheological Clutch Actuator (hydraulic coupling with clutch assembly and magnetorheological clutch drive), discloses a magnetorheological fluid multi-disk torque transmission device for four-wheel drive vehicles, The hydraulic pressure generated by the plunger pump is used to axially compress the magnetorheological fluid in the radial gap of multiple disks, and the viscosity of the magnetorheological fluid is adjusted by the electromagnetic field, but the electromagnetic coil is external, the structure is large, the magnetic circuit is unreasonable, and the transmission speed little moment

U.S. Patent US6988602B2, Torque transfer Coupling with Magnetorheological Clutch Actuator (coupling with magnetorheological clutch drive), discloses another magnetorheological coupling for four-wheel drive vehicles, which has multiple disks in the radial gap The magnetorheological fluid participates in the work, using the rotating cam to axially compress the radial gap of multiple discs, and the electromagnetic field is used to adjust the viscosity of the magnetorheological fluid between the discs, but the electromagnetic coil is external, the structure is large, and the magnetic circuit is unreasonable , the transmission torque is not large

U.S. Patent US6725990B2, Torque transfer Clutch with Magnetorheological Actuator and Ball ScrewOperator. Announced another magnetorheological coupling for four-wheel drive vehicles, with magnetorheological fluids in the radial gaps of multiple discs participating in the work, using spiral The screw compresses the radial gap between multiple disks, and the electromagnetic field is used to adjust the viscosity of the magnetorheological fluid between the disks, but the electromagnetic coil is external, the structure is large, the magnetic circuit is unreasonable, and the transmission torque is not large

Chinese patent 200410081536.7 discloses a magneto-rheological soft start device, which is a device with a single disk and double coils with heat pipes for heat dissipation. It does not use the relationship between the torque and the number of friction surfaces. There is an air gap in the road, the effective magnetic field is weak under the same current condition, and the transfer torque and power are small

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