SK7525Y1 - Multimotor - Google Patents

Abstract

Multimotor has engines (8) located around the large wheel (2), whereby the small wheels (5) on the shafts of motors (8) and the additional small wheels (7) are between outer periphery of the large wheel (2) and the inner periphery of belted (1).

Description

SK 7525 Υ1

Technical field

The technical solution relates to a multimotor for the purpose of propulsion of mobile devices, in particular of electric airplanes because of the advantageous parameters of weight and optimum speed. Reciprocal application is an electric generator for low mass purposes.

BACKGROUND OF THE INVENTION

Requirements for the minimum weight of mobile devices, especially airplanes with electric propulsion (multicopter), are currently applied by integrating smaller units into multiple systems or by using devices with lower power for purposes without higher buoyancy requirements. Multicopters (drones) are thus designed to lift cameras or objects of limited weight (emergency medicines, appliances), food delivery and the like. Remote and technically simple operation in combination with low total weight allows to use pure electric drive on Lilon batteries or supercapacitors, or hybrid drive for increasingly wider applications in various variants. In particular, planetary gears are used to reduce the revolutions, but they reduce the service life of the devices with increased stress on the intermediate wheel bearings and their gearing.

The essence of the technical solution

Increasing the power and economical parameters of the current state of mobile drives allows a technical solution which is based on a multi-rotor integrated with a speed reducer comprising at least two motors flexibly attached to a frame or hub for bearings of the central output shaft. The small wheels of each engine are in contact with rolling on the large wheel along its outer periphery and in contact with the belt on its inner periphery, the large wheel being facilitated by folding from a wider periphery with a link that connects the periphery to the axis of the output shaft.

Between the pair of engines, there are additional small wheels independently positioned freely between the large wheel and the belt, whose speeds are counter-rotating. Each auxiliary wheel thus increases torque at the maximum permissible circumferential force of one small wheel.

The contact surfaces between the large wheel, the belt and the small wheels or auxiliary wheels may be friction surfaces with sufficient contact with the material suitable for friction gears such as Al, Si, Cu or various friction linings with optimum choice of performance, efficiency and lifetime depending on static coefficient of friction and compressive strength of the material. The integrated drive system from a number of smaller units allows low unit transmission power while reducing the specific gravity of the engines and utilizing high speeds.

Overview of the figures in the drawing

1 is a partial cross-sectional side view of a multimotor with an integrated reducer. Figure 2 is a view in the direction of the axis of the output shaft.

Example

Multimotor for propellers propellers multicopter with purpose use in rescue manipulation technology or personal transport and tourism. Multimotor is under each propeller, eg. quadrocopters, and includes e.g. four electric motors 8 with small wheels 5 and four additional small wheels 7. Compared to the large wheel 2, they are ten times smaller in diameter, giving a gear ratio of the reduction of the speed of electric motors 8. Relatively low power per propeller allows friction gears to be used e.g. oxidised duralumin on all-wheel contact rings. Dimensions and performance are variable depending on the purpose of use. In general, the design benefits for weight and efficiency parameters apply to all variants. The radial thrust of the small wheels 5 and the auxiliary wheels 7 is a thrust from the belts 7, e.g. in the form of a shrink disk - an elastic annulus which rotates opposite to the large wheel 2 and which is also driven by the additional small wheels 7, without bearing load. The abundance of small high-speed engines and the reduction method make it possible to minimize the specific weight of the multimotors, including a reduction below 0.8 kg per installed kw.

The possibility of overloading the motors for a short period of time allows for an efficient transport of loads from the mountains (injured people, waste, wood). Powerful short stroke is followed by low power descent. Weight and cost saving is

SK 7525 Υ1 also possible for hybrid variant with internal combustion engine for propeller propeller in horizontal flight and simultaneous charging of the battery for short-term load of electric motors.

Another example is the reciprocal use of a multimotor as an electric generator, wherever the speed source is low speed (wind and hydro power systems). Especially in advanced systems that are designed to operate in higher airflow layers and where the specific gravity plays an important role for the operability on tall structures or on flying aerodynamic or aerostatic devices. The use of hard, thermally or chemically treated materials allows a technical solution with a service life of the roller bearings at 0.96 efficiency, with losses largely creating the rolling resistance of the wheels. Generator (motor) bearings are unloaded.

Another example is two-stage and multi-stage speed reduction in applications for extreme gear ratios. In these cases, the motors 8 are in the multimotor configuration, thereby implementing the first reduction stage. Their central output shaft is positioned on the periphery of the final output large wheel 2. The transmission is suitable for speed reduction in mills, crushers, rollers and the like, or multiplication of speed in large diameter wind turbines. With frictional contact surfaces, the advantage is the possibility of slipping during impacts and sufficient transmission force by multiple wheel contact.

PROTECTION REQUIREMENTS

Claims (3)

Multimotor integrated with a speed reducer, comprising a plurality of smaller motors disposed around a central output shaft, characterized in that at least two motors (8) are attached by a radial or extensible spring clip (4) to the frame or hub (6), their small wheel (5) is in contact with the large wheel (2) on its outer periphery and in contact with the belt (1) on its inner periphery, the large wheel (2) comprising a link (3) attached to the output shaft axis. Multimotor according to claim 1, characterized in that between the pair of motors (8) there are additional small wheels (7) independently positioned between the large wheel (2) and the wrap (1). Multimotor according to claim 1 and 2, characterized in that the contact surfaces between the large wheel (8), the wrap (1) and the small wheels (7) are friction surfaces of the material with optimum friction properties such as Al, Si, Cu or friction linings. known from high static friction techniques. 1 drawing