Test stand and module system for testing electrically drivable axle modules for motor vehicles - Patents.com

Abstract

The invention relates to a test stand (100) for testing electrically drivable axle modules (140) for motor vehicles. The test stand comprises a test stand base (130) with a first load motor (110) and a second load motor (120) and a test object holder (131) for receiving the axle modules. A first motor shaft (111) of the first load motor is connectable without a gear ratio with a first output shaft (142) of the axle module, and a second motor shaft (121) of the second load motor is connectable without a gear ratio with a second output shaft (143) of the axle module. The first load motor and the second load motor are each designed as permanently excited synchronous motors having at least 12 pole pairs. The test stand is arranged in a first carriage (150) on the test stand base so that the first load motor is deliverable to the axle module, and the second load motor is arranged in a second carriage (160) on the test stand base so that the second load motor is deliverable to the axle module.

Description

[Technical field]

[0001] The present invention relates to a test stand for testing electrically drivable axle modules for motor vehicles and to a corresponding module system according to the preamble of claim 1. [Background technology]

[0002] Transmission test stands for testing the transmission of a motor vehicle or drivetrain test stands for testing the entire drivetrain of a motor vehicle are known from the prior art. Test stands of this kind can be used for example for quality control in order to detect malfunctions in the drivetrain at an early stage through a series of load tests. Typical malfunctions are caused by parts with play, such as gears, synchronizer rings, synchronizer bodies, multi-plate clutch discs, shafts, etc., which can be deflected and excited. Within the scope of this kind of quality control, the acoustic behavior and the shifting quality are usually also tested. Test stands of this kind are likewise used in the development and in the continuous improvement of the drivetrain of a motor vehicle.

[0003] In this context, DE 4328537 C2 describes a transmission test stand with a first servo motor serving as a drive motor and a second servo motor serving as a brake motor. The drive motor is connected via a coupling to a drive shaft of the transmission of the vehicle to be tested and is controlled in terms of its rotational speed via a PC, in particular so that any rotational speed curve can be simulated. The brake motor is connected via a further coupling to an output shaft of the transmission of the vehicle to be tested. The rotational speed of the brake motor is also controlled via a PC. The rotational speed curve simulated by the PC is the rotational speed curve measured in a real road test. The transmission of the vehicle can thus be tested in accordance with DE 4328537 C2 before it is mounted in the vehicle.

[0004] DE10328461A1 discloses a vehicle test stand with a load machine for each driving wheel of a motor vehicle. The load machines are connected to the rims of the wheels of the vehicle directly, for example via wheel bolts, or indirectly, for example via a belt drive. As a result, the load machines can drive as well as brake the drive train. The vehicle test stand of DE10328461A1 further comprises a frame structure. Via the frame structure, the motor vehicle and the load machines can be lifted and aligned with each other. During the test process, the motor vehicle as a whole is held on the frame structure such that the wheels of the vehicle do not come into contact with the ground.

[0005] However, known vehicle test stands have drawbacks for several reasons: on the one hand, they are relatively large and therefore require a relatively large installation area, on the other hand, in their case, the force flow from the load motor to the foundation of the test stand is not ideal. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] DE4328537C2 [Patent Document 2] DE10328461A1 Summary of the Invention [Problem to be solved by the invention]

[0007] SUMMARY OF THE DISCLOSURE The object of the invention is to propose an improved test stand for testing electrically drivable axle modules for motor vehicles. [Means for solving the problem]

[0008] This problem is solved according to the invention by a test stand for testing electrically drivable axle modules for motor vehicles according to claim 1. Advantageous embodiments emerge from the dependent claims.

[0009] The invention relates to a test stand for testing electrically drivable shaft modules for motor vehicles. The test stand comprises at least one first load motor and at least one second load motor, as well as a test stand base with a test object holder for receiving the shaft modules. A first motor shaft of the first load motor is connectable without a gear ratio to a first output shaft of the shaft module. A second motor shaft of the second load motor is connectable without a gear ratio to a second output shaft of the shaft module. The first load motor and the second load motor are each designed as a permanently excited synchronous motor having at least 12 pole pairs.

[0010] The test stand according to the present invention is characterized in that a first load motor is arranged on a first carriage on the test stand base so as to be deliverable to the axis module, and a second load motor is arranged on a second carriage on the test stand base so as to be deliverable to the axis module.

[0011] The invention therefore describes a test stand suitable for testing electrically drivable axle modules for motor vehicles, which typically include a gear and two wheel axles in addition to an electric drive motor.

[0012] The test stand according to the invention comprises at least one first load motor and at least one second load motor, which are designed as electric motors, i.e. as permanently excited synchronous motors having at least 12 pole pairs.

[0013] The electric motor itself is generally of relatively compact design, has a wide speed range, particularly in comparison with an internal combustion engine, and advantageously has its maximum torque over a wide speed range.

[0014] The described permanently excited synchronous motors, which have at least 12 pole pairs, are also known in particular as so-called synchronous torque motors. This offers the advantage that the load motors are particularly compact, particularly axially short and designed to rotate slowly, but can provide high torques. For example, the first and second load motors can provide speeds of up to 3000 rpm.

[0015] Each load motor comprises a respective motor housing which surrounds the load motor and is designed, for example, in a cylindrical shape.

[0016] The motor housing may also include a water cooling system.

[0017] Advantageously, each load motor is assigned its own inverter, which is designed, for example, with three phases.

[0018] The first load motor comprises a first motor shaft. The second load motor comprises a second motor shaft. The first motor shaft of the first load motor is connectable with a first output shaft of the shaft module to be tested. Similarly, the second motor shaft of the second load motor is connectable with a second output shaft of the shaft module. In this case, the connection is designed as a drive connection without relative rotation and without a gear ratio.

[0019] A ratioless connection in the sense of the present invention is understood to mean a connection without intermediately shifted gears or gears. No speed change therefore occurs. Correspondingly, the test stand according to the present invention is advantageously designed without relatively expensive gears or corresponding speed stages for reducing the speed of the motor. This significantly reduces both the required installation space and the manufacturing costs.

[0020] By omitting the gears for reducing the rotational speed of the first and second load motors according to the present invention, in addition to the gears, for example, connecting means that are separately required for connecting the first and second load motors are also omitted, and furthermore, there is no need to provide mechanical protection means for covering the rapidly rotating connecting means.

[0021] A further advantage of omitting the gearbox is that no switching operations are required to adjust the speed or torque and, correspondingly, the shaft module can be continuously loaded without interrupting the switching.

[0022] Since the gears of similar test stands are usually switched pneumatically or hydraulically, the corresponding pneumatic or hydraulic devices can also advantageously be omitted.

[0023] In the sense of the present invention, a driving connection is understood to mean a mechanical connection for transmitting mechanical power. The mechanical connection may be direct or may also involve, for example, an intermediate shaft.

[0024] The first and second output shafts of the axle module are typically the first and second wheel axles of the axle module and are energized with torque and speed by the electric drive motor of the axle module via gears of the axle module during operation of the axle module.

[0025] Via the driving connection of the first output shaft with the first motor shaft and the driving connection of the second output shaft with the second motor shaft, the torques and rotational speeds generated by the first and second load motors can additionally be introduced into the shaft module. The shaft module can thus also be energized, i.e. loaded, with these torques and rotational speeds. Together, the torques and rotational speeds each constitute a mechanical output. The shaft module is accordingly loaded.

[0026] The test stand further includes a test stand base having a test subject holder for receiving the axis module, via which the axis module can be placed on the test stand and thus subjected to a testing process.

[0027] The test stand base is the element on which all other components of the test stand are placed. It therefore positions all other components of the test stand relative to one another and holds them in place. It therefore constitutes, at least in a figurative sense, a kind of scaffold or frame on which the other components of the test stand are placed.

[0028] The test stand base advantageously consists at least in part of a particularly rigid material, such as a mineral casting, in particular with a metal skeleton structure. Due to the compact design of the first and second load motors and the omission of gears, in particular, the test stand base can also be made significantly smaller. This in turn leads here too to a considerable cost reduction.

[0029] According to the present invention, here, a first load motor is arranged on a first carriage on the test stand foundation so as to be deliverable to the axis module, and a second load motor is arranged on a second carriage on the test stand foundation so as to be deliverable to the axis module.

[0030] Thus, the first load motor is arranged on a first carriage and the second load motor is arranged on a second carriage. The first and second carriages are each movably arranged on the test stand base, for example on rails. As a result, the first and second carriages can be moved towards, i.e. delivered to, the axis module or moved away from the axis module as required. This allows in a simple manner to establish and remove again the drive connection from the first motor shaft to the first output shaft or to establish and remove again the drive connection from the second motor shaft to the second output shaft. The installation of the axis modules on the test stand is also significantly simplified.

[0031] According to a preferred embodiment of the invention, the test stand further comprises a drive motor, the drive motor shaft of which can be connected to the input shaft of the axis module. This has the advantage that the axis module is not driven in this case by its own drive motor, which is assigned to it only. Instead, a drive motor, which is assigned to the test stand and connected to the test stand base, is used to test the axis module. This usually allows a relatively extensive and intensive test.

[0032] The drive motor, similar to the first and second load motors, is advantageously arranged on a third carriage, which is also deliverable to the axis module, for example by being arranged so that it can move on rails.

[0033] The drive motor is also preferably designed as a so-called synchronous torque motor with at least 12 pole pairs. The drive motor is likewise preferably assigned a three-phase inverter.

[0034] The motor shaft of the drive motor is preferably connectable, non-rotatably and without a transmission ratio, to the input shaft of the shaft module.

[0035] According to a further preferred embodiment of the invention, the first carriage is designed as a first angle plate and the second carriage is designed as a second angle plate. An angle plate is understood to be a part with two faces that are substantially perpendicular to one another, i.e. perpendicular to one another, the first surface of which serves to receive the respective load motor, e.g. via a motor mount, and the second surface of which is arranged on the test stand base so as to be movable, e.g. via a rail.

[0036] The first and second angle plates are advantageously made of steel. In addition to the two surfaces forming the angle, hence the name, they can also comprise additional reinforcing struts, which connect the first and second surfaces to each other and thus provide additional reinforcement.

[0037] According to a further preferred embodiment of the invention, the first load motor is arranged at one end face against a motor mount of the first carriage, the second load motor is arranged at one end face against a motor mount of the second carriage, the first and second carriages being provided for this with a first motor mount or a second motor mount.

[0038] This results in a relatively large contact surface of the first and second load motors at the respective carriage. This in turn leads to a relatively high stiffness. As a result, the occurrence of vibrations in the area of ​​the load motors during the test operation can be effectively prevented. This type of coupling of the load motors furthermore results in the following advantage: the torque or the force generated can be introduced into the first or second carriage and from there into the test stand foundation. There is therefore a clear force flow. The end faces of the first and second load motors, at which they are coupled to the base frame, are preferably the so-called a-sides of the load motors.

[0039] Preferably, the first and second motor mounts are each flange connections, with an end face of the respective load motor or an end face of the housing of the respective load motor forming a first part of the flange connection, and a corresponding motor mount on each carriage forming a second part of the flange connection.

[0040] Due to the possibility of arranging the first and second load motors via flange connections on the test stand foundation, the test stand according to the invention can also be relatively easily converted to different load strengths by arranging load motors of higher or lower power classes on the base frame. Advantageously, all load motors of different power classes have a standardized flange interface.

[0041] According to a further preferred embodiment of the invention, the test stand comprises a vertical adjustment module for the first and / or second load motor and / or drive motor, which advantageously allows vertical adjustment of the first or second load motor or drive motor to align them vertically with the axis module or with the respective output axis of the axis module and thus allows establishing a drive connection from the first or second load motor or drive motor to the axis module.

[0042] By using the vertical adjustment module, the first or second load motor or the drive motor can advantageously be adjusted vertically simply and in particular steplessly, so that in particular there is no need to remove the first or second load motor or the drive motor from the motor mount and then, if necessary, reposition them vertically offset on the motor mount, for example via another, correspondingly offset screw connection.

[0043] According to a particularly preferred embodiment of the invention, the vertical adjustment module comprises a first plate and a second plate, the first plate and the second plate being arranged one on top of the other, the first plate and the second plate being vertically adjustable relative to one another.

[0044] The first plate is provided with a motor mount, in particular in the form of a perforated ring with a flange connection, whereas the second plate of the vertical adjustment module can be connected, for example, directly with the angle plate, for example also via a flange connection.

[0045] The first and second plates of the vertical adjustment module additionally advantageously comprise at least one vertical guide rail along which the first plate can be adjusted vertically relative to the second plate.

[0046] The first and second plates of the vertical adjustment module can be adjusted relative to one another, for example, manually via a screw drive mechanism or automatically via an actuator.

[0047] According to a further preferred embodiment of the invention, the first motor shaft is connected to the first output shaft without a clutch and in a non-rotatable manner via a first connecting shaft. The second motor shaft is connected to the second output shaft without a clutch and in a non-rotatable manner via a second connecting shaft. The first connecting shaft thus connects the first output shaft directly to the first motor shaft. Similarly, the second connecting shaft connects the second output shaft directly to the second motor shaft. Due to the absence of a clutch, the connection from the motor shaft to the output shaft is relatively short and torsionally stiff. This in turn prevents the occurrence of torsional vibrations. In addition, no additional mass is introduced into the drive train, so that no associated imbalances occur.

[0048] Advantageously, furthermore, the motor shaft of the drive motor is also connected clutchlessly and non-rotatably with the input shaft of the shaft module via a corresponding connecting shaft.

[0049] According to a further preferred embodiment of the invention, the first motor shaft is connected to the first connecting shaft via a first torque sensor so as to be non-rotatable relative to the first connecting shaft, and the second motor shaft is connected to the second connecting shaft via a second torque sensor so as to be non-rotatable relative to the second connecting shaft.

[0050] Thus, the first torque sensor and the second torque sensor each constitute a connecting element, through which the first motor shaft and the second motor shaft are connected to the first connecting shaft and the second connecting shaft, respectively, so as to be non-rotatable relative to each other.

[0051] Thereby, the torque provided by the load motor is conducted, i.e. entirely, via the first or second torque sensor, which therefore records the provided torque entirely.

[0052] The first and second torque sensors each preferably comprise one or more force sensing elements, in particular one or more strain gauges, which first detect a force acting on the force sensing element or forces acting on a plurality of force sensing elements, and then, via the geometry of the torque sensor, the acting torque, respectively, can be determined from the detected force or forces.

[0053] Similarly, the motor shaft of the drive motor can also advantageously be connected via a torque sensor to the drive motor's connecting shaft.

[0054] According to a further preferred embodiment of the invention, the first connecting shaft is designed as a universal joint shaft and the second connecting shaft is designed as a universal joint shaft. This has the advantage that the first load motor does not have to be precisely aligned with the first output shaft and correspondingly the second load motor does not have to be precisely aligned with the second output shaft, since the respective universal joint shafts have a certain degree of adjustment of the offset angle. This simplifies and speeds up the clamping of the shaft module to the test bench.

[0055] Similarly, and advantageously, the connecting shaft to the input shaft of the drive motor can also be designed as a universal joint shaft.

[0056] According to a further preferred embodiment of the invention, the first motor shaft is designed as a hollow shaft and the first torque sensor is arranged on the end face of the first load motor facing away from the shaft module and / or the second motor shaft is designed as a hollow shaft and the second torque sensor is arranged on the end face of the second load motor facing away from the shaft module. In this case, the first connecting shaft can be led through the first motor shaft designed as a hollow shaft and connected to the first connecting shaft on the b side of the first load motor via the first torque sensor in a non-rotatable manner. Similarly, the second connecting shaft can be led through the second motor shaft designed as a hollow shaft and connected to the second connecting shaft on the b side of the second load motor via the second torque sensor in a non-rotatable manner.

[0057] Similarly, the motor shaft of the drive motor can also advantageously be designed as a hollow shaft. A torque sensor of the drive motor can be arranged on the end face of the drive motor facing away from the shaft module.

[0058] According to a particularly preferred embodiment of the invention, the first torque sensor is arranged on the end face of the first load motor facing away from the test object and / or the second torque sensor is arranged on the end face of the second load motor facing away from the test object, which means that the first torque sensor is arranged on the so-called b-side of the first load motor and correspondingly the second torque sensor is arranged on the b-side of the second load motor.

[0059] Preferably, the rotational speed of the first load motor, the second load motor or the drive motor, respectively, is also detected, for example via their control electronics, in particular via their inverter. From the known rotational speed and the known torque, for example, the mechanical power with which the shaft module is energized can be determined.

[0060] The present invention further relates to a modular system for easily manufacturing a test stand adapted to a test object. The modular system includes at least one first load motor and at least one second load motor, each of which is of a common power class, and at least one first inverter and at least one second inverter, each of which is of a common power class. The common power class of the at least one first and second inverter corresponds to the power class of the at least one first and second electric motor. Furthermore, the modular system includes a first carriage and a second carriage, and a test stand base.

[0061] The modular system thus allows the production of a test stand according to the invention and contains all components of the test stand according to the invention. Furthermore, the modular system can optionally contain a number of first and second load motors as well as a number of first and second inverters, each of which is paired and assigned to a power class. This makes it possible, for example, to place a more or less powerful load motor on the test stand depending on the axis module to be tested or the test object and to control it via the respective inverter adapted to the power class of the load motor.

[0062] In the following, the invention is explained exemplarily using the embodiments shown in the drawings. [Brief description of the drawings]

[0063] [Figure 1] 1 shows an exemplary and schematic diagram of a possible embodiment of a device according to the invention for testing an electrically drivable axle module for a motor vehicle; [Diagram 2] FIG. 2 is an exemplary schematic side view of a possible embodiment of a first load motor arranged on a first carriage. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0064] Identical objects, functional units and comparable components are designated with the same reference symbols throughout the figures. These objects, functional units and comparable components are identical with respect to their technical characteristics, unless otherwise stated explicitly or implicitly in the description.

[0065] 1 exemplarily and diagrammatically shows a possible embodiment of a test stand 100 according to the invention for testing electrically drivable axle modules for motor vehicles (not shown in FIG. 1). The test stand 100 comprises a first load motor 110 and a second load motor 120 as well as a test stand base 130. The test stand base 130 comprises a test object holder 131 for receiving an axle module 140. The drive module 140 represents the test object to be tested.

[0066] The axle module 140 consists, for example, of an electric drive motor 141, a gear and two wheel axles 142, 143. In the illustration of Fig. 1, the wheel axles 142, 143 are enclosed, for example, by a rigid axle housing. However, it is also possible to test axle modules 140 which are equipped for independent wheel suspension and do not have a correspondingly rigid axle housing.

[0067] The wheel rims 144, 145 are attached to the axial ends of the wheel axles 142, 143. The wheel axles 142, 143 form the output shafts 142, 143 of the axle module 140.

[0068] The first motor shaft 111 of the first load motor 110 is connected to the first output shaft 142 of the axle module 140 or to the first wheel rim 144 only via the first universal joint shaft 112, without a gear ratio and without a clutch. Correspondingly, the second motor shaft 121 of the second load motor 120 is connected to the second output shaft 143 of the axle module 140 or to the second wheel rim 145 only via the second universal joint shaft 122, without a gear ratio and without a clutch.

[0069] As can be seen, however, the first motor shaft 111 is not directly connected to the first universal joint shaft 112. Rather, the connection is made via a first torque sensor 113, which connects the first motor shaft 111 to the first universal joint shaft 112 in a non-rotatable manner. Thus, any torque introduced by the first load motor 110 to the universal joint shaft 112 is conducted via and can be detected by the first torque sensor 113. Similarly, a second torque sensor 123 is also disposed between the second motor shaft 121 and the second universal joint shaft 122.

[0070] The first universal joint shaft 112 is surrounded by a first mechanical guard 114 to protect, in particular, an operator of the test stand 100 from injury that may be caused by the high rotational speed and high torque of the first load motor. Similarly, the second universal joint shaft 122 is surrounded by a second mechanical guard 124 to protect an operator of the test stand 100 from injury.

[0071] The first load motor 110 and the second load motor 120 are each designed as a synchronous motor 110, 120 of the permanently excited type with at least 12 pole pairs. Synchronous motors 110, 120 of this kind are also known as so-called synchronous torque motors. Synchronous torque motors are designed to be particularly compact, particularly axially short, and to rotate slowly, but are able to provide high torque. For example, the first and second load motors 110, 120 can provide speeds of up to 3000 rpm.

[0072] As can be seen, the first load motor 110 is disposed on a first carriage 150, and the second load motor 120 is disposed on a second carriage 160. The first carriage 150 and the second carriage 160 are deliverable towards the axis module 140 along rails not shown in FIG. 1. This simplifies installation of the axis module 140.

[0073] The first carriage 150 is designed as a first angle plate 150 made of steel and the second carriage 160 is designed as a second angle plate 160 also made of steel.

[0074] The first carriage 150 comprises a motor mount 152 designed as a flange connection for the first load motor 110. Correspondingly, the second carriage 160 comprises a motor mount 162 designed as a flange connection for the second load motor 120.

[0075] The first load motor 110 is disposed at one end surface, i.e., the so-called a-side, in contact with the motor mount 152 of the first carriage 150 via the first motor mount 152. Similarly, the second load motor 120 is disposed at one end surface, i.e., also at the a-side, in contact with the motor mount 162 of the second carriage 160. This allows the first and second load motors 110, 120 to be coupled to the test stand 100 in a relatively rigid manner.

[0076] According to a further embodiment, not shown, the axis module 140 of Fig. 1 does not include its own drive motor. Instead, the test stand 100 according to the invention includes drive motors designed as permanently excited synchronous motors with at least 12 pole pairs, for example the two load motors 110, 120. The drive motor of the test stand 100 is arranged in a T-configuration relative to the two load motors 110, 120 such that it is perpendicular to an imaginary axis passing through the first and second load motors 110, 120 and its motor shaft is connectable with the input shaft of the axis module 140 via a universal joint shaft.

[0077] Thus, the axis module 140 can be driven by the drive motor and loaded by the load motors 110, 120 for the testing process.

[0078] FIG. 2 shows an exemplary and schematic side view of a possible embodiment of the first load motor 110 arranged on the first carriage 150. The first load motor 110 is arranged on its a-side on the first carriage 150. The vertical adjustment module 170 is arranged between the first carriage 150 and the first load motor 110. The vertical adjustment module 170 is arranged on the first side on the first carriage 150 and on the a-side of the first load motor 110 on the second side. Correspondingly, the vertical adjustment module 170 comprises, for example, a motor mount 152 for the first load motor 110. The vertical adjustment module 170 allows the first load motor 110 arranged on the second side of the vertical adjustment module 170 to be adjusted vertically, i.e. in height, with respect to the first carriage 150 arranged on the first side of the vertical adjustment module 170. This allows the first load motor 110 to be brought into a position that is vertical and allows for as straight a connection as possible between the first motor shaft 111 and the first output shaft 142 of the shaft module 140. This allows the first universal joint shaft 112 to only have to compensate for a smaller angular offset.

[0079] As can further be seen, the first carriage 150 is designed as a first angle plate 150 made of steel and is arranged on the test stand base 130 so as to be axially movable along rails (not shown). As can also be seen, the first carriage is also provided with a stiffening strut 151 in order to avoid the occurrence of vibrations as much as possible.

[0080] According to a further embodiment, the electric motor shown in FIG. 2 is a second load motor 120 arranged on a second carriage 150 .

[0081] According to yet a further embodiment, the electric motor shown in figure 2 is the drive motor, which is arranged in a carriage assigned to the drive motor. [Explanation of symbols]

[0082] 100 Test bench 110 First load motor 111 First motor shaft 112 first connecting shaft, first universal joint shaft 113 First torque sensor 114 1st mechanical protection section 120 Second load motor 121 First motor shaft 122 second connecting shaft, second universal joint shaft 123 Second torque sensor 124 Second mechanical protection section 130 Test Stand Foundation 131 Test object holder 140 Test Subjects 141 Electric drive motor to be tested 142 First output shaft, first wheel shaft 143 Second output shaft, second wheel shaft 144 1st wheel rim 145 2nd wheel rim 150 1st carriage, 1st angle plate 151 Reinforcement pillar 152 Motor mount, flange connection 160 2nd carriage, 2nd angle plate 162 Motor mount, flange connection 170 Vertical adjustment module

Claims

1. A test stand (100) for testing electrically drivable shaft modules (140) for motor vehicles, comprising: at least one first load motor (110) and at least one second load motor (120); and a test stand base (130) having a test object holder (131) for receiving the shaft modules (140), wherein a first motor shaft (111) of the first load motor (110) is connectable to a first output shaft (142) of the shaft module (140) without a gear ratio; and a second motor shaft (121) of the second load motor (120) is connectable to a second output shaft (143) of the shaft module (140) without a gear ratio; and wherein the first load motor (110) and the second load motor (120) are each designed as a permanently excited synchronous motor having at least 12 magnetic pole pairs. A test stand (100), characterized in that the first load motor (110) is arranged on a first carriage (150) on the test stand base (130) so as to be deliverable to the axis module (140), and the second load motor (120) is arranged on a second carriage (160) on the test stand base (130) so as to be deliverable to the axis module (140).

2. 2. The test stand (100) of claim 1, The test stand (100) further comprises a drive motor, the drive motor shaft of which is connectable to an input shaft of the shaft module (140).

3. 3. The test stand (100) according to claim 1 or 2, A test stand (100), characterized in that the first carriage (150) is designed as a first angle plate (150) and the second carriage (160) is designed as a second angle plate (160).

4. 3. The test stand (100) according to claim 1 or 2, A test stand (100), characterized in that the first load motor (110) is arranged in abutment with a motor mount (152) of the first carriage (150) at one end surface, and the second load motor (120) is arranged in abutment with a motor mount (162) of the second carriage (160) at one end surface.

5. 3. The test stand (100) according to claim 1 or 2, The test stand (100) is characterized in that it includes a vertical adjustment module (170) for the first load motor (110) and / or the second load motor (120) and / or the drive motor.

6. 3. The test stand (100) according to claim 1 or 2, A test stand (100) characterized in that the first motor shaft (111) is connected to the first output shaft (142) via a first connecting shaft (112) without a clutch and in a manner that prevents relative rotation, and the second motor shaft (121) is connected to the second output shaft (143) via a second connecting shaft (122) without a clutch and in a manner that prevents relative rotation.

7. 3. The test stand (100) according to claim 1 or 2, A test stand (100), characterized in that the first motor shaft (111) is connected to the first connecting shaft (112) via a first torque sensor (113) so as not to rotate relative to each other, and the second motor shaft (121) is connected to the second connecting shaft (122) via a second torque sensor (123) so as not to rotate relative to each other.

8. 8. The test stand (100) according to claim 7, A test stand (100), characterized in that the first connecting shaft (112) is designed as a universal joint shaft (112) and the second connecting shaft (122) is designed as a universal joint shaft (122).

9. 8. The test stand (100) according to claim 7, the first motor shaft (111) is designed as a hollow shaft and the first torque sensor (113) is arranged on the end face of the first load motor (110) facing away from the shaft module (140), and / or The test stand (100) is characterized in that the second motor shaft (212) is designed as a hollow shaft, and the second torque sensor (123) is arranged on the end face of the second load motor (120) opposite the shaft module (140).

10. 3. A modular system for easily manufacturing a test bench (100) adapted to a test object as described in claim 1 or 2, the modular system including at least one first load motor (110) and at least one second load motor (120), each of which has a common power class, and at least one first inverter and at least one second inverter, each of which has a common power class, wherein the common power class of the at least one first and second inverters corresponds to the power class of the at least one first and second electric motors (110, 120), and the modular system further includes a first carriage (150) and a second carriage (160), and a test bench base (130).

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