Device for conveying thick matter

Abstract

The invention relates to a device (1000) for conveying thick matter, comprising: a first electric motor (101), a second electric motor (201), a first power path (100) via which electrical power can be transmitted from an AC voltage supply (300) to the first electric motor (101), wherein the first power path (100) has: a first rectifier (102), wherein the first rectifier (102) rectifies one or more AC voltages of the AC voltage supply (300) and outputs same in a rectified state at the rectifier output (103), a first intermediate circuit (104) which is electrically coupled to the rectifier output (103) of the first rectifier (102), an electrical energy store (105) which is electrically coupled to the first intermediate circuit (104), and a first inverter (106) which is supplied from the first intermediate circuit (104) and is designed to actuate the first electric motor (101), a second power path (200) via which electrical power can be transmitted from the AC voltage supply (300) or from a further AC voltage supply to the second electric motor (201), wherein the second power path (200) has: a second rectifier (202), wherein the second rectifier (202) rectifies the one or more AC voltages of the AC voltage supply (300) or one or more AC voltages of the further AC voltage supply and outputs same in a rectified state at the rectifier output (203), a second intermediate circuit (204) having a first intermediate circuit part (204a) and a second intermediate circuit part (204b), wherein the first intermediate circuit part (204a) is electrically coupled to the rectifier output (203) of the second rectifier (202), an actuatable switch means (205) which, depending on the switch position thereof, electrically connects the second intermediate circuit part (204b) either to the first intermediate circuit part (204a) or to the first intermediate circuit (104), and a second inverter (206) which is supplied from the second intermediate circuit part (204b) and is designed to actuate the second electric motor (201).

Description

[0001] Device for conveying thick material

[0002] The invention is based on the objective of providing a device for conveying thick material that enables high-performance and flexible operation of the device.

[0003] The device for conveying thick material has a first electric motor, for example in the form of a three-phase motor.

[0004] The device also includes at least one second electric motor, for example also in the form of a three-phase motor.

[0005] The device further comprises a first power path through which electrical power from, for example, a three-phase AC power grid can be transferred to the first electric motor. The first power path comprises: a first passive or active rectifier, wherein the first rectifier rectifies one or more AC voltages from the AC power grid and outputs them rectified at its rectifier output; a first intermediate circuit electrically coupled to the rectifier output of the first rectifier; an electrical energy storage device, for example in the form of a rechargeable battery, electrically coupled to the first intermediate circuit; and a first inverter fed from the first intermediate circuit, which is configured to drive the first electric motor in the conventional manner.

[0006] The device further comprises a second power path through which electrical power from the AC network or from another, for example three-phase, AC network can be transferred to the second electric motor, wherein the second power path comprises: a second passive or active rectifier, wherein the second rectifier rectifies the one or more AC voltages of the AC network or one or more AC voltages of the other AC network and outputs them rectified at its rectifier output, a second intermediate circuit with a first intermediate circuit part and a second intermediate circuit part, wherein the first intermediate circuit part is electrically coupled to the rectifier output of the second rectifier.

[0007] The device further comprises a controllable switching element which, depending on its switching position, electrically connects the second intermediate circuit section either to the first intermediate circuit section or to the first intermediate circuit. The device further comprises a second inverter, fed from the second intermediate circuit section, which is configured to control the second electric motor.

[0008] In one embodiment, the first rectifier is designed to provide galvanic isolation.

[0009] In one embodiment, the controllable switching device is a contactor.

[0010] In one embodiment, the electrical power that can be transmitted via the first power path is less than the electrical power that can be transmitted via the second power path.

[0011] In one embodiment, the electrical power that can be transmitted via the first power path corresponds to a maximum charging power of the electrical energy storage device.

[0012] In one embodiment, a voltage level of the first intermediate circuit corresponds to a voltage level of the electrical energy storage device.

[0013] In one embodiment, the first electric motor and the second electric motor drive a common output shaft, which, for example, drives one or more hydraulic pumps.

[0014] In one embodiment, the device is designed to be mobile, with the electrical energy storage device being designed to supply an electric (driving or traction) drive for moving the device.

[0015] In one embodiment, the first rectifier is configured to output a voltage at its rectifier output with a variably predefinable voltage level.

[0016] In one embodiment, the predefinable voltage level is predetermined in such a way that it corresponds to an optimal operating voltage level of the electrical energy storage device.

[0017] In one embodiment, the second rectifier is a passive rectifier.

[0018] The invention is described in detail below with reference to the drawing. The drawing shows:

[0019] Fig. 1 shows a schematic block diagram of a device for conveying viscous material. Fig. 1 shows a schematic block diagram of a device 1000 for conveying viscous material in the form of a truck-mounted concrete pump. It is understood that, for the sake of clarity and presentation, only the essential components of the invention are shown.

[0020] The device 1000 for conveying thick material comprises a first electric motor 101 and a second electric motor 201. The electric motors drive conventional loads (not shown), such as hydraulic pumps, etc.

[0021] The device 1000 further comprises a first power path 100, via which electrical power from an AC voltage network 300 can be transmitted to the first electric motor 101, wherein the first power path 100 comprises: a first rectifier 102, wherein the first rectifier 102 rectifies one or more AC voltages of the AC voltage network 300 and outputs them rectified at its rectifier output 103, a first intermediate circuit 104, which is electrically coupled to the rectifier output 103 of the first rectifier 102, an electrical energy storage device 105 electrically coupled to the first intermediate circuit 104, and a first inverter 106 supplied from the first intermediate circuit 104, which is configured to drive the first electric motor 101.

[0022] The device 1000 further comprises a second power path 200, via which electrical power from the AC power grid 300 can be transferred to the second electric motor 201, wherein the second power path 200 comprises: a second rectifier 202, wherein the second rectifier 202 rectifies the one or more AC voltages of the AC power grid 300 or one or more AC voltages of another AC power grid (not shown) and outputs rectified at its rectifier output 203, a second intermediate circuit with a first intermediate circuit part 204a and a second intermediate circuit part 204b, wherein the first intermediate circuit part 204a is electrically coupled to the rectifier output 203 of the second rectifier 202.

[0023] The device 1000 further comprises a controllable switching device 205 in the form of a contactor, which, depending on its switching position, electrically connects the second intermediate circuit part 204b all poles either to the first intermediate circuit part 204a or to the first intermediate circuit 104.

[0024] The device 1000 further includes a second inverter 206 supplied from the second intermediate circuit part 204b, which is designed to control the second electric motor 201.

[0025] The first rectifier 102 is designed to provide galvanic isolation. The electrical power transferable via the first power path 100 is less than the electrical power transferable via the second power path 200.

[0026] The electrical power that can be transmitted via the first power path 100 corresponds to a maximum charging power of the electrical energy storage device 105, for example 80 kW.

[0027] A voltage level of the first intermediate circuit 104 corresponds to a voltage level of the electrical energy storage device 105.

[0028] The first rectifier 102 is designed to output a voltage at its rectifier output 103 with a variable voltage level such that the voltage level corresponds to an optimal operating voltage level of the electrical energy storage device 105.

[0029] The electrical input currents of the device 1000 according to the invention for conveying viscous material typically fluctuate between 63 A and 400 A. Therefore, the device 1000 should operate both with sufficiently high mains power, for example 250 A to 400 A, and in a battery-buffered boost mode, during which, at low mains power, for example < 250 A, energy is temporarily stored in the electrical energy storage device or battery 105. The battery 105 is to be provided independently of the maximum electrical drive power.

[0030] The invention allows all performance levels to be provided effectively depending on the available power connection.

[0031] The invention divides the power flow into 2 independent paths 100 and 200, which are independently scalable.

[0032] The first power path 100 includes the battery or electrical energy storage device 105. The first power path 100 is galvanically isolated and dimensioned according to the battery charging capacity and the minimum required motor drive power of the consumers connected to the electric motor 101. The electrical power transferable via the first power path 100 corresponds, for example, to 25% of the maximum power of the device 1000. The intermediate circuit voltage corresponds to the battery voltage. The first rectifier 102 can, for example, include an active rectifier section 102a with power factor correction (PFC) and a galvanically isolated DC / DC converter 102b. The first rectifier can, for example, consist of one or more on-board chargers connected in parallel. The second power path 200 does not include a battery.The electrical power transferable via the second power path 200 corresponds, for example, to 75% of the maximum power of the device 1000 and can, for example, be greater than 200 kW. The second power path 200 typically does not have galvanic isolation and is dimensioned according to the maximum drive power in conjunction with power path 1. The second rectifier 202 can, for example, be a passive diode rectifier with a passive PFC filter circuit. The DC link voltage in the second power path 200 can, for example, be approximately 565 V and be load-dependent. If the second rectifier 202 is actively configured, the DC link voltage can be influenced within limits.

[0033] Depending on the available input power at the installation site, the inverters 106 and 206 of the power paths 100 and 200 are appropriately connected via the contactor 205 in order to always be able to supply all consumers.

[0034] At low electrical input power Pnetwork <= Ppowerpath, contactor 205 couples the inverter 206 of the second power path 200 with the first power path 100 or the first DC link 104. Battery power and grid power are used optimally. Due to the switching position of contactor 205, the input of the second power path 200 or the first DC link section 204a is decoupled (unlike the illustration).

[0035] With high electrical input power Pnetwork >= Ppowerpath1 + Ppowerpath2, the first power path 100 is active and supplies all connected electrical loads. Battery power can be used. The second power path 200 is also active and supplies all connected loads via contactor 205. The two power paths 100 and 200 are otherwise separate from each other. This corresponds to the switching position of contactor 205 shown in Fig. 1.

[0036] The invention enables a cost-effective design through the use of small power electronics. The invention can be implemented using readily available components. The galvanically isolated rectifier 102 can be an on-board charger.

Claims

Patent claims 1. Device (1000) for conveying thick material, comprising: a first electric motor (101), a second electric motor (201), a first power path (100) via which electrical power from an AC voltage network (300) can be transmitted to the first electric motor (101), wherein the first power path (100) comprises: a first rectifier (102), wherein the first rectifier (102) rectifies one or more AC voltages of the AC voltage network (300) and outputs them rectified at its rectifier output (103), a first intermediate circuit (104) which is electrically coupled to the rectifier output (103) of the first rectifier (102), an electrical energy storage device (105) electrically coupled to the first intermediate circuit (104), and a first inverter (106) supplied from the first intermediate circuit (104) which is configured to drive the first electric motor (101), a second Performance path (200),The second power path (200) comprises: a second rectifier (202), wherein the second rectifier (202) rectifies one or more AC voltages from the AC network (300) or one or more AC voltages from the other AC network and outputs them rectified at its rectifier output (203); a second intermediate circuit (204) with a first intermediate circuit section (204a) and a second intermediate circuit section (204b), wherein the first intermediate circuit section (204a) is electrically coupled to the rectifier output (203) of the second rectifier (202); and a controllable switching device (205) which, depending on its switching position, electrically connects the second intermediate circuit section (204b) either to the first intermediate circuit section (204a) or to the first intermediate circuit (104). connectsand a second inverter (206) fed from the second intermediate circuit section (204b), which is designed to control the second electric motor (201).

2. Device (1000) for conveying thick material according to claim 1 , characterized in that the first rectifier (102) is designed to be galvanically isolating.

3. Device (1000) for conveying thick material according to one of the preceding claims, characterized in that the controllable switching means (205) is a contactor.

4. Device (1000) for conveying thick material according to one of the preceding claims, characterized in that the electrical power that can be transmitted via the first power path (100) is smaller than the electrical power that can be transmitted via the second power path (200).

5. Device (1000) for conveying thick material according to one of the preceding claims, characterized in that the electrical power transferable via the first power path (100) corresponds to a maximum charging power of the electrical energy storage device (105).

6. Device (1000) for conveying thick material according to one of the preceding claims, characterized in that a voltage level of the first intermediate circuit (104) corresponds to a voltage level of the electrical energy storage device (105).

7. Device (1000) for conveying thick material according to one of the preceding claims, characterized in that the first electric motor (101 ) and the second electric motor (201 ) drive a common output shaft (107).

8. Device (1000) for conveying thick material according to one of the preceding claims, characterized in that the device (1000) is mobile, wherein the electrical energy storage device (105) is configured to supply an electric drive for moving the device (1000).

9. Device (1000) for conveying thick material according to one of the preceding claims, characterized in that the first rectifier (102) is configured to output a voltage with a variably predefinable voltage level at its rectifier output (103).

10. Device (1000) for conveying thick material according to claim 9, characterized in that the predefinable voltage level is predefinable in such a way that it corresponds to an optimal operating voltage level of the electrical energy storage device (105).

11. Device (1000) for conveying thick material according to one of the preceding claims, characterized in that the second rectifier (202) is a passive rectifier.

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