DE4220057A1 - Appts for power transmission between fixed and mobile units - incorporates magnetised discs at ends of respective shafts of fixed motor and mobile generator for battery-charging with microprocessor control - Google Patents

Abstract

The fixed unit (2) incorporates an electric motor (22) with a magnetic disc (24) at the end of its shaft (23). The movable unit (23) carries a generator (32) driven by a shaft (33) from another magnetic disc (34), to supply current over a two-wire line (8) to a storage battery (12), via a control unit e.g. microprocessor. A signal generator on one of the units switches the power supply to the motor when the two units are suitably placed for transmission of power between the two magnetic discs. ADVANTAGE - Power is transmitted only when the units are in the correct spatial relationship for greater reliability and efficiency.

Description

The invention relates to a device for energy transmission from a first unit, in particular a stationary unit, to another portable unit, each unit assigned a device for delivering or absorbing energy is and both units are movable relative to each other.

From DE 40 16 400 a device is known, the two ge separate and fixed or mobile units has, the units each having a device for Ab is assigned or absorbed energy. It happened issued that the use of solar cells for realization the device for absorbing energy (especially at the portable unit) has a poor efficiency points. In addition, solar cells are not on in the dark settable, so that in this case a large dimension and there with expensive backup battery is required. Will - how proposed in DE 40 16 400 - as a device for recording of energy, an accumulator is provided which is in an end position the portable unit can be charged via plug contacts, this has the disadvantage that the connection of the plug contacts ma must be manufactured or - with an automatic Ver binding - the plug contacts mechanical interference as well Are exposed to environmental influences (e.g. corrosion) Do not guarantee reliable charging of the battery is steady. There is a coupling for HF transmission of energy  also cost-intensive, prone to errors or failures and may require approval. Furthermore, it can due to the high HF emissions to changes in the hereditary mass or damage to an operator's organism.

The invention has for its object a device for To provide energy transfer that works reliably and has sufficient or optimal efficiency and avoids the disadvantages described.

This object is achieved in that a device for En Energy transfer from a first unit, in particular one stationary unit, to another portable unit unit, one unit having a device for dispensing and another unit a device for absorbing energy is arranged and both units are movable relative to each other, characterized in that at least one unit is an Si Gnalgeber is assigned, the energy transfer from such triggers that at a predeterminable position of the two units to each other energy from the device for delivering energy the first unit on the device for absorbing energy is transferable to the other unit. This makes it possible that only then energy from the first to the further unity is transmitted when both units have a definable position have reached each other. This is between energy transfer between the two units a sufficient or optimal we The degree of efficiency can be realized, since whenever there is a predefinable Position is reached, energy is transferable and interference are largely excluded. In addition, a Be influence of the environment by interference radiation or high frequency, as would be the case with RF energy transmission closed.

In a further development of the invention, the first unit is supplied ordered device for delivering energy an electric motor and the recording device assigned to the further unit of energy a generator. Furthermore, the electric motor from  a mains voltage can be driven and the generator an accumulator downstream. With this embodiment it is possible that the electric motor converts the electrical energy (mains voltage) into one converts mechanical energy and the supplied to the generator mechanical energy from this into an electrical energy too is converted back and fed to the accumulator. Thereby reliable energy transfer is guaranteed as this mechanical energy transmission is not susceptible to interference.

In a further embodiment essential to the invention, he the energy transfer follows after actuation of the signal transmitter such that between the facilities of the first and the wide ren unit a non-positive connection to the energy transfer is produced. Alternatively, it is conceivable and even if essential to the invention that the energy transfer according to Be actuation of the signal generator takes place such that between the on directions of the first and the further unit a magnetic Connection is established. With the non-positive connection it is for example a mechanical clutch, the a shaft of the electric motor with a shaft of the generator connects. The mechanical coupling is for example, a spring-operated or magnet-operated Claw coupling, which is in a predeterminable position of the two Units can be actuated to each other. For example, is a The predeterminable position is reached, the claw coupling can be adjusted Activation of the signal generator (if the shafts of the electric motor and the generator are aligned) so that the one from the Electric motor delivered mechanical energy in the generator converted and the accumulator downstream of the generator is charged. In addition, it is conceivable that the mechanical clutch is designed as a friction clutch. Here is on the one hand it is conceivable that at the end of each wave For example, a rubber washer is attached to the Reaching the predefinable position by shifting in the Longitudinal axis of a shaft are interconnectable. On the other hand it is conceivable that with a lateral movement of the two Unit to each other the rubber washers (alternatively gears, for example, also conceivable) when the  Reaching the predeterminable position due to friction on the outer surface Are connectable (or the gears into each other intervention).

As an alternative to the mechanical coupling is a magnetic one Connection made. To this end, are on the wave of Electric motor and on the shaft of the generator (especially on one end of the waves) one magnet each, the ma genetic connection through at least partial alignment of the two shafts can be produced. Here is the magnetic connection both by moving the two units lengthways direction as well as in any transverse direction of the waves producible. There is also a different kind of relative movement Units or a single unit (e.g. a slide gonal displacement) conceivable. After activating the signal generator, which a position scan with respect to the position of the first Carries out unit to the further unit, the electromo Tor switched on and the on the shaft of the electric motor ordered magnet powered. This magnet moves the on the Shaft of the generator arranged magnet (magnetic disk or Bar magnet) in motion, so that the generator gate is also driven and the mechanical energy transferred into electrical energy converts energy and charges the accumulator. In the on the Magnets arranged in waves are permanent or Electromagnets or a combination of the two Magnet types. The electromagnet is activated for the purpose moderately after actuation of the signal generator.

In a development of the invention is on the wave of the electromo tors a magnet arranged in a coil of the generator is movable into it. This arrangement takes place in particular small dimensions application because between the magnet (Magnetic disk) and the cup-shaped, for example Coil of a tight air gap is required to get one to realize the efficiency. It is a alternative embodiment that imitate an asynchronous generator det, which is used, for example, in systems of smaller dimensions  bar and is used in systems in which a highly precise exact movement of the two units to each other takes place.

In a further development of the invention, the signal generator is an inductor ver or capacitive signal transmitter trained. Alterna tiv to this, the signal generator works optically, in particular as Photoelectric barrier. This is advantageously several ages native training forms of the signal generator for recording the loading movement of the two units to each other and to record a given given position.

In further embodiments of the invention is in the first one unit at least one control unit that integrates the operation controls or monitors the electric motor. It is also provided hen that a control unit, in particular in the further unit special is a microprocessor, which is integrated Control unit controls at least the state of charge of the battery or monitored. By using the two control units ensures that the approach of the two units is optimally controlled so that safe energy transmission is guaranteed. Monitoring the state of charge of the battery lators has the advantage that the correct power supply to the further unit is ensured and impairments or Failure of the other units due to a faulty one Power supply can be avoided. The way of working at least both control units is nä within the scope of the description of the figures ago explained.

In a further development of the invention, the first unit and the further unit encapsulated. It can be provided that especially the two magnets (magnetic disks where it are permanent or electromagnets) are arranged inside or outside the encapsulation. A complete encapsulation including the magnets has the intent partly that contamination or other interferences (e.g. order world influences) can be avoided and safe operation of the two units is guaranteed.  

In a development of the invention, the device for energy transmission to a device for monitoring the sensor position len can be used, as for example in DE 40 16 400 be is written. Furthermore, the device according to the invention can be used for example on a sliding gate, the other portable unit arranged on the movable sliding gate is net and the signal generator from the sliding gate, especially in one of the two end positions can be actuated.

In a further embodiment of the invention, a frequency-generating device with a coil arrangement is provided in the first unit, the coil arrangement being designed to transmit energy to a further coil arrangement in the further unit. In this embodiment of the invention, safe energy transmission with a high degree of efficiency is also possible, this contactless energy transmission taking place according to the transformer principle (configurations for this are shown in FIG. 7, for example). It is conceivable that the frequency-generating device is activated as a function of a signal from the signal generator, whereby, for example, an AC voltage is applied to the coil arrangement provided in the first unit. This alternating voltage also induces an alternating voltage in the further coil arrangement in the further unit, which can be supplied to the accumulator after rectification. As an alternative to a frequency-generating device, it is conceivable that the mains voltage (an AC voltage) is applied directly to the coil arrangement in the first unit as a function of a signal from the signal generator. With this arrangement, encapsulation of the two units is possible and advantageous.

The triggering of the energy transfer depending on one Signal of the signal generator has the advantage that only then energy is transmitted if the two units have a definable position to each other. Furthermore, it is conceivable that the in the control units provided the energy  Control and monitor transmission according to the transformer principle. Ins It is also particularly important here that the energy output in the to optimally control the first provided coil arrangement as well as the energy consumption in the further coil arrangement and to control or monitor the state of charge of the battery.

Further embodiments of the invention and the use of it Device according to the invention on a device for monitoring of sensor points are explained in more detail below and in the Figures described.

Show it:

Fig. 1 is a compound having two magnet discs,

Fig. 2, the energy transmission by means of a nerators Asynchronge,

Fig. 3 shows a device for monitoring of sensor len Stel,

Fig. 4 is a device for energy transmission with control units,

FIGS. 5 and 6 embodiments concerning a mechanical coupling,

Fig. 7 is a guide for the approach of the two units to each other in different versions.

Fig. 1 shows an inventive device for energy transmission, the connection for energy transmission is made by means of two magnetic disks. The components of a stationary unit 2 are an electric motor 22 , on the shaft 23 of which a magnet, in particular a magnetic disk 24 , is arranged. The components of a portable unit 3 are a generator 32 , on the shaft 33 of which a magnet, in particular a magnetic disk 34 , is also arranged. Via 8 designated electrical lines (in particular two-pole), the generator 32 is connected to a battery 12 , the battery 12 taking over the power supply of the portable unit 3 . Depending on the current consumption of the components of the portable unit, the generator 32 can also be followed by a correspondingly dimensioned capacitance. The relative movement of the stationary unit 3 to the stationary unit 2 takes place, for example, in a direction denoted by X or in a direction denoted by Y. If, with at least partial alignment of the shafts 23 and 33, a correspondingly arranged and not shown signal transmitter is actuated, the electric motor 22 is switched on after the magnetic coupling process and drives the generator 32 or slowly up-regulates it. The energy given by the electric motor 22 is thus transmitted via the magnetic connection (consisting of the magnetic disks 24 , 34 ) to the generator 32 , which charges the accumulator 12 . Due to the robust design of the magnetic connection, trouble-free energy transfer is ensured.

Fig. 2 shows the energy transfer by means of an asynchronous generator. In addition to the components shown in FIG. 1 and provided with the same reference numerals, in FIG. 2 the accumulator 12 is connected to a coil 35 via the electrical line 8 . Due to a movement of the magnetic disk 24 in the X direction into the fixed coil 35 or due to a movement in the X direction of the coil 35 to the stationary magnetic disk 24 , the electric motor 22 is switched on when the position shown in FIG. 2 is reached and in the coil 35 due to the rotational movement of the magnetic disk 24 induces a voltage that charges the accumulator 12 . Since such a configuration requires a narrow air gap between the magnetic disk 24 and the pot-shaped coil 35 , the magnetic disk 24 can be conical, for example, so that a forced guidance is provided when it is inserted.

Fig. 3 shows a device for monitoring sensor points (for example switching strips), in which the device according to the invention is used for energy transmission. A device 1 for monitoring sensor points, as is known at least in part from DE 40 16 400, has the stationary unit 2 and the portable unit 3 . The unit 2 is assigned a component 21 which has a transmitter 4 and a receiver 5 . Furthermore, the unit 2 is assigned a signal generator 6 and the component 21 is connected to control signal generators 7 . The component 21 and the electric motor 22 are supplied with current from a mains voltage source 11 via electrical lines 8 , the switching device 61 connected to the signal generator 6 being connected upstream of the electric motor 22 . The electric motor 22 is in turn connected to the magnetic disk 24 via the shaft 23 . The portable unit 3 has a component 31 , which is also assigned a transmitter 4 and a receiver 5 . Signals that are supplied to the component 31 are detected via measured value signal transmitters 9 . The component 31 is in turn connected via electrical lines 8 to the accumulator 12 , which takes over the power supply to the component 31 . To charge the accumulator 12 in the position shown in FIG. 3, the accumulator 12 is connected to the generator 32 , on the shaft 33 of which the magnetic disk 34 is arranged. In the position of the unit 3 to the unit 2 shown in FIG. 3, in which the shafts 23 and 33 are aligned, the switching device 61 is actuated by the signal transmitter 6 , the signal transmitter 6 detecting the position of the unit 3 . This can be done optically, for example, by arranging a light transmitter and a light receiver in the unit 2 (for example infrared diodes), the radiation of which is deflected by a reflector arranged on the unit 3 and detected when the predeterminable position is present. Due to the fact that the electric motor 22 is switched on, energy is transferred from the unit 2 to the unit 3 , as explained in the description of FIG. 1. Furthermore, it is conceivable that the unit 3 is equipped with the order described in Fig. 2. In Fig. 3, a first predetermined position is shown for the unit 3. In addition, it is conceivable that in at least one further predeterminable position, further devices according to the invention with at least the signal transmitter 6 , the electric motor 22 and the magnetic disk 24 arranged on the shaft 23 for energy transmission are present. A movement of the unit 3 is possible at least in both the X and Y directions.

Fig. 4 shows a device for energy transmission with control units. In addition to the use of components which have been shown and described in FIG. 3, a control unit 62 is shown in FIG. 4 in the first unit 2 and a control unit 40 in the further unit 3 (which may be microprocessors). intended. The control unit 62 is connected on the aisle side to the signal generator 6 and to the mains voltage source 11 . On the output side, the control unit 62 is connected to the electric motor 22 . Alternatively, it is hen that the control unit 62 is connected on the output side instead of the electric motor 22 to a coil arrangement. In addition, the unit 2 (or the control unit 62 ) has an interface 25 with which signals or data can be received, emitted or exchanged. This is the case, for example, if more than one unit 2 is provided (for example in a network). The control unit 62 further includes a motor controller 620 , a device 621 for detecting and evaluating the motor current, a device 622 for detecting and evaluating the motor voltage, and a control logic 623 . The operation of these four components is described below. The actuation of the Si signal generator 6 is detected by the control logic 623 , which then actuates the engine control 620 . This actuation takes place in the form of a pulse width modulation, so that the speed of the electric motor 22 increases continuously in an advantageous manner by changing the pulse width. This ensures that when the two units 2 and 3 have reached a predeterminable position with respect to one another, the energy transmission (coupling of the magnets) starts safely. The device 621 has the task of monitoring the current drawn by the electric motor 22 . If a predeterminable limit value is exceeded (a value that comes about, for example, due to a blocking of the electric motor 22 ), this value is detected by the device 621 , passed on to the control logic 623 , which actuates the motor controller 620 by changing the pulse width, so that the current drawn by the electric motor 22 is regulated back to a value below the limit value.

In the event that the magnetic force between the two Ma gneten 24 and 34 is not sufficient, it is necessary to detect the speed of the electric motor 22 (alternatively, the speed of the generator 32 ). For this purpose, the device 622 for the motor voltage is provided, which operates in such a way that the voltage on the electric motor 22 is measured during the switch-off phase of the pulse width modulation. In the event that the electric motor 22 rotates, but the generator 32 is stopped (due to insufficient magnetic forces between the magnets 24 and 34 ), the measured voltage of the electric motor 22 leaves a predeterminable value range, which it detects by the device 622 and to the Control logic 623 is forwarded. The control logic 623 then controls the motor controller 620 in such a way that, for example, the speed of the electric motor 22 is reduced or the electric motor 22 is stopped, so that a renewed switch on of the electric motor 22 to restore the power transmission can be carried out. In addition, the control unit 62 has a clock generator, which is assigned in particular to the control logic 623 .

If a non-positive connection is established between the two magnets 24 and 34 (or between the coupling device used), the accumulator 12 is charged by the voltage generated in the generator 32 . To avoid discharging the battery 12 via the generator 32 , a diode D is connected between these two components. This diode D prevents the generator 32 from supplying itself from the accumulator 12 during the idle time. In an advantageous embodiment, the accumulator 12 is interchangeably arranged in a holder in the further unit 3 , so that it is easily interchangeable. The control unit 40, which monitors the state of charge and the voltage of the accumulator 12 , is a microprocessor that is supplied with voltage from the accumulator 12 . In addition, it is conceivable that the power supply to the control unit 40 takes place directly via the generator 32 . Furthermore, in the control unit 40 there is a charging device which charges or holds the voltage of the accumulator 12 to a predeterminable value. The Ladeeinrich device is advantageously a charge pump switching power supply. To control or monitor the power supply of the further unit 3 , it is necessary to monitor this setpoint. If this value falls below this value (voltage breakdown), this state can be delayed or output and displayed directly (for example optically or acoustically) via an output 38 (alarm output). In addition, the control unit 40 can be designed in such a way that components connected to it via an interface 39 are brought into a safe state after detection of the voltage breakdown and, for example, after calling a program sequence which contains emergency running properties for these components. In addition, it is necessary that the microprocessor of the control unit 40 must be started specifically when the power supply is switched on (starting of the generator 32 ). For example, there is the case that when the generator 32 starts up, the supply voltage is not abruptly applied to the microprocessor with its setpoint. In this area of the rising supply voltage, the microprocessor is in an undetermined state. To avoid malfunctions caused by data corruption in this start-up phase and for a perfect start, the microprocessor must be blocked via its reset input (reset input) until the full supply voltage is present. If the microprocessor cannot be started properly, this can also be indicated via alarm output 38 .

If a program sequence is stored in the control unit 40 , which controls the components connected via the interface 39 (for example a drive motor for driving a sliding gate), it is conceivable in a further embodiment of the invention that the microprocessor is assigned a watchdog that performs the task has to monitor the normal program flow of the microprocessor and to reset the microprocessor to the starting point of the program flow in the event of incorrect deviations from the specified program flow (software). The watchdog consists, for example, of a multivibrator that is blocked by the microprocessor while the program is running correctly. For this purpose, pulses are regularly sent out by the microprocessor, which reset the multivibrator again and again. This prevents the multivibrator from becoming active. In the event of a possible faulty program run due to external disturbances (for example faulty voltage supply, faulty states of the connected components), these pulses do not occur, so that the multivibrator becomes active. As a result, the microprocessor is set in hardware at the start of the program and is thus again in a determinable state.

In FIGS. 5 and 6 mechanical couplings are shown, wherein movement of the unit 3 in the X direction and in Fig. 6 takes place a movement of the unit in the Y direction in Fig. 5. In Fig. 5, on the shaft 23, for example, a rubber disk designated by 26 (this can alternatively be a disk with egg nem friction lining) is arranged, which when displaced in the X direction, a non-positive connection with a on the shaft 33 of the Generator 32 arranged further rubber washer 36 ago ago. In Fig. 6 on the shaft 23 a designated 27 gear is arranged, which engages after moving the portable unit in the Y direction in a arranged on the shaft 33 wei teres gear 37 . Reaching the engagement of the two gears 27 and 37 can be detected, for example, by an optically acting signal transmitter (light barrier). On the other hand, it is conceivable to detect a predefinable position of the unit 3 , which represents this intervention. In FIGS. 5 and 6 is shown 3 to the unit 2 in each case a position of the unit in which the frictional connection is not yet reached. It should also be pointed out that the components shown in FIGS . 3 and 4 can be combined with one another in a suitable manner. For example, it is conceivable that the control unit 62, including its individual components, takes over the control or monitoring of the component 21 . Control unit 40 can also be used to control or monitor component 31 .

Fig. 7 shows a guide to align the two units to each other. The example of a sliding gate shows how a guide for optimal power transmission (non-positive, magnetic or inductive) is designed when the portable unit 3 approaches the stationary unit 2 , in particular in the X direction. The fixed unit 2 is attached to a post 72 , which represents a stop or an end position for a sliding gate 73 . The unit 2 is equipped with a linear guide 74 , which is, for example, a tube into which the unit 3 can be moved. To compensate for tolerances, the linear guide is widened at its open end. In addition, the linear guide 74 can also be implemented as a push rod or as a slide. The movable bar attached to the sliding gate 73 unit 3 is movable against the force of a spring 75 , so that in the end position (sliding gate 73 lies in the area of the post 72 ), the unit 3 in the linear guide 74 a defined position to the unit 2 takes so that the optimal energy transfer is guaranteed. To implement the defined position, a spacer 76 is also arranged on the unit 2 , with which, for example, the two magnets 24 and 34 (not shown in this figure) can be positioned at a predeterminable distance from one another (for example in the millimeter range). Wei terhin it is conceivable that the linear guide 74 or the Di punch 76 of the unit 3 are assigned. Likewise, the switching on of the electric motor 22 (in particular controlled by the control unit 62 ) can be delayed after reaching the predefinable position (the defined position), so that the two magnets 24 and 34 can align. In addition, a brief switch-on of the electric motor 22 is conceivable, so that the mechanical coupling (for example a claw coupling) engages to establish a non-positive connection. If the predeterminable position (check on the basis of the signal from the signal transmitter 6 and a timer circuit) is not reached after a predeterminable period of time after the closing operation has been initiated, it is necessary to issue an error message (for example at the output 38 ). A movement in the Y direction (dashed lines) or in any direction is also conceivable. Fig. 7a shows a further embodiment of the linear guide 74, which has, at the opening side of a funnel-like shape 77th A coil 78 is arranged around the linear guide 74 , the linear guide 74 being fastened to the unit 3 . Alternatively, a separate arrangement of unit 3 and linear guide 74 is conceivable, in which case coil 78 is electrically connected to unit 3 . A core 79 is arranged on the unit 2 , around which a coil 78 is in turn arranged. The core 79 is inserted into the linear guide 74 by movement in the direction denoted by X. Tolerances can be compensated with the shape 77 . After detection of the end position, the energy can be transferred between units 2 and 3 according to the transformer principle. Due to the way of working, wear of the individual components is advantageously avoided.

Fig. 7b shows an embodiment of coil 78 and cores 79, which are in turn arranged on the units 2 and 3 and electrically connected therewith. In the embodiment shown, the movement takes place essentially in the direction denoted by Y. Tolerance compensation can also be carried out here by means of the funnel-shaped formation, a carriage or the use of springs.

In Figure 7c. An associated one unit core 79 is formed the ends pointed, while having the other unit to parent core 79 opposite the core 79 in the handy Wesent the tip inlet adapted recess. The movement is essentially in the X direction, while other directions of movement are conceivable. Furthermore, a gimbal suspension of a core 79 with the coil 78 is shown, which are realized with Fe 75 '.

It should be noted that the versions shown in FIGS . 7 and 7a to 7c are suitable combinable with each other. The core-coil combinations on units 2 and 3 are advantageously used directly (arranged on the units) or indirectly (electrical interconnection with units 2 and 3 ), units 2 and 3 being connected to a sliding gate or to one the sliding gate associated posts are attached.

Claims (16)

1. Device for energy transmission from a first unit, in particular a stationary unit ( 2 ) to a further portable unit ( 3 ), one unit being a device for dispensing and the other unit being assigned a device for absorbing energy and both units ( 2 , 3 ) can be moved relative to one another, characterized in that at least one unit ( 2 or 3 ) is assigned a signal transmitter ( 6 ) which triggers the energy transmission in such a way that when the two units ( 2 , 3 ) are in a definable position energy can be transferred to one another from the device for supplying energy from the first unit ( 2 ) to the device for receiving energy from the further unit ( 3 ). 2. Device for energy transmission according to claim 1, characterized in that the first unit ( 2 ) assigned device for delivering energy is an electric motor ( 22 ) and the further unit associated device for receiving energy is a generator ( 32 ) . 3. Device for energy transmission according to claim 2, characterized in that the electric motor ( 22 ) from a mains voltage ( 11 ) can be driven and the generator ( 32 ) is followed by a battery ( 12 ). 4. A device for energy transmission according to claim 2 or 3, characterized in that the energy transmission takes place after actuation of the signal generator ( 6 ) such that between the devices ( 22 , 32 ) of the first and the further unit ( 2 , 3 ) a non-positive Connection ( 26 , 36 or 27 , 37 ) for energy transfer is established. 5. A device for energy transmission according to claim 4, characterized in that the non-positive connection is a mechanical coupling which connects a shaft ( 23 ) of the electric motor ( 22 ) with a shaft ( 33 ) of the generator ( 32 ). 6. Device for energy transmission according to claim 2 or 3, characterized in that the energy transmission takes place after actuation of the signal generator ( 6 ) such that between the devices ( 22 , 32 ) of the first and the further unit ( 2 , 3 ) one magnetic connection is established. 7. A device for energy transmission according to claim 6, characterized in that on a shaft ( 23 ) of the electromotor ( 22 ) and on a shaft ( 33 ) of the generator ( 32 ) each have a magnet, in particular as a permanent or electromagnet in the form a magnetic disk ( 24 , 34 ) is arranged, the magnetic connection being able to be established by at least partially aligning the two shafts ( 23 , 33 ). 8. A device for energy transmission according to claim 6, characterized in that a magnet ( 24 ) is arranged on a shaft ( 23 ) of the electric motor ( 22 ), which is movable into a coil ( 35 ) of the generator. 9. A device for energy transmission according to claim 8, characterized in that the coil ( 35 ) is cup-shaped and the arranged on the shaft of the electric motor magnet (magnetic disc) is conical. 10. Device for energy transmission according to one of the preceding claims, characterized in that the signal transmitter ( 6 ) is designed as an inductive or capacitive signal transmitter or works optically, in particular as a light barrier. 11. Device for energy transmission according to one of the preceding claims, characterized in that in the first unit ( 2 ) at least one control unit ( 62 ) is integrated, which controls or monitors the operation of the electric motor ( 22 ). 12. Device for energy transmission according to one of the preceding claims, characterized in that in the further unit ( 3 ) a control unit ( 40 ), in particular a microprocessor, is integrated, which controls or monitors at least the state of charge of the battery ( 12 ). 13. Device for energy transmission according to one of the preceding claims, characterized in that the first unit ( 2 ) and the white unit ( 3 ) are encapsulated. 14. Device for energy transmission according to one of the preceding existing claims, characterized in that the device on a device can be used to monitor sensor points.   15. Device for energy transmission according to one of the preceding claims, characterized in that the device can be used on a sliding gate ( 73 ), the further portable unit ( 3 ) being arranged on the movable sliding gate ( 73 ) and the signal transmitter ( 6 ) at least part of the sliding gate ( 73 ), in particular in one or both end positions, can be actuated. 16. Device for energy transmission according to one of the preceding claims, characterized in that in the first unit ( 2 ) a frequency generating device is provided with a coil arrangement, the coil arrangement for energy transfer to a further coil arrangement in the further unit ( 3 ) is.