Assembly of an electric motor with an encoder

Abstract

In order to reduce the cable outlay of a motor with an encoder, the motor (10) has an encoder interface (11) which can be connected to a regulating unit (3) in order to receive an adjustment signal (u) from the regulating unit (3), the encoder interface being designed to receive an encoder signal (s2) from an encoder (2). Furthermore, the motor (10) has a signal interface (12) which is designed to transmit the encoder signal (s2) to the regulating unit (3).

Description

Technical Field

[0001] This invention relates to an electric motor capable of being connected to an adjustment unit to receive an adjustment signal from the adjustment unit. Furthermore, this invention relates to a component comprising an electric motor according to the invention, an adjustment unit, an encoder, an encoder cable, and a connecting cable. Additionally, this invention relates to a method for operating an electric motor, wherein an encoder signal from an encoder is transmitted to an adjustment unit, which, using the encoder signal, determines an adjustment signal and transmits the adjustment signal to the electric motor. Background Technology

[0002] Electric motors, especially servo motors, are frequently used in industrial equipment, particularly in machine tools, packaging machines, and industrial robots. The motor's adjustment parameters are regulated by an adjustment unit using predetermined values ​​of adjustment signals. To achieve this regulation, at least one encoder is required, providing an encoder signal that is fed back to the adjustment unit. Multiple encoders can also be used, such as a master encoder and one or more slave encoders. The master encoder is typically integrated onto the motor (master device), while the slave encoders are located on the slave device and thus away from the motor. Therefore, a (slave) encoder is arranged on the slave device (e.g., a roller connected to the motor), where a cable extending from the slave device to the adjustment unit directly transmits the encoder signal to the adjustment unit. Alternatively, a single encoder can be used, for example, located externally to the motor.

[0003] The regulating unit processes the encoder signal and calculates the adjustment parameters therefrom, which are then transmitted to the motor as an adjustment signal. This results in significant cabling costs; in particular, adding, removing, or replacing the encoder is especially expensive due to the long cable connection between the encoder and the regulating unit. Summary of the Invention

[0004] Therefore, the objective of this invention is to reduce the cost of cable laying for motors with encoders.

[0005] According to the present invention, the task is accomplished by having a motor with an encoder interface designed to receive encoder signals from an encoder, and the motor with a signal interface designed to transmit encoder signals to a regulating unit. In the assembly comprising the motor, regulating unit, encoder, encoder cable, and connecting cable according to the present invention, the encoder interface can be connected to the encoder via the encoder cable to receive encoder signals from the encoder, and the motor's signal interface is connected to the regulating unit via the connecting cable to transmit encoder signals to the regulating unit.

[0006] Furthermore, the task is accomplished by a method of transmitting encoder signals from the encoder to the motor and from the motor to the regulating unit.

[0007] Therefore, according to the present invention, the encoder is not directly connected to the regulating unit via a cable, but preferably connected to the motor via an encoder cable. A servo motor can be particularly suitable as the motor. Furthermore, the encoder signal is transmitted to the regulating unit by the motor. The regulating unit processes the encoder signal and thereby determines the adjustment parameters, which are then transmitted to the motor. Because the encoder is connected to the motor rather than directly to the regulating unit, simpler cable routing is ensured, especially when the encoder is positioned close to the motor and further away from the regulating unit. A modular and simpler connection of the regulating unit, motor, and encoder is achieved by connecting the encoder to the encoder interface of the motor, with the motor forming the center. Therefore, the encoder can be easily replaced, removed, or added.

[0008] Preferably, the signal interface is designed to transmit the encoder signal itself to the conditioning unit. This means that the encoder signal is circulated through the motor and transmitted to the conditioning unit unchanged. Alternatively, the encoder signal can be processed (e.g., modulated onto a suitable carrier wave) and thus transmitted to the conditioning unit.

[0009] The motor can be designed to transmit a signal from another encoder to the regulating unit. Therefore, in addition to the encoder signal, the other encoder signal can also be transmitted by the motor to the regulating unit. The regulating unit processes the encoder signal and the other encoder signal and thereby determines adjustment parameters, which are then transmitted to the motor. Specifically, the encoder can be configured as a slave encoder and the other encoder can be configured as a master encoder.

[0010] The other encoder can be integrated into the motor. Therefore, the signal from this other encoder exists directly on the motor and can be transmitted from the motor to the control unit. As another encoder, especially when integrated into the motor, a resolver, incremental encoder, absolute encoder, etc., can be used. The position can be determined, for example, using this other encoder signal.

[0011] Preferably, the signal interface is designed to transmit the other encoder signal to the adjustment unit. Therefore, the signal interface transmits not only the encoder signal but also the other encoder signal to the adjustment unit.

[0012] The connecting cable can be connected to the signal interface of the motor and to the regulating unit so that the encoder signal and the other encoder signal can be transmitted to the regulating unit via the connecting cable. Therefore, not only the encoder signal but also the other encoder signal can be transmitted to the regulating unit via a common signal interface and a common connecting cable, thereby reducing cable laying costs.

[0013] If the signal interface is designed to transmit the encoder signal and the other encoder signal to the regulating unit, then in the assembly including the motor, regulating unit, encoder, the other encoder (which may also be integrated on the motor), encoder cable and connecting cable, the encoder interface may be connected to the encoder via the encoder cable to receive encoder signals from the encoder, and the signal interface may be connected to the regulating unit via the connecting cable to transmit the encoder signal and the other encoder signal to the regulating unit.

[0014] Preferably, the signal interface is designed to transmit the other encoder signal itself to the conditioning unit. This means that the other encoder signal is transmitted to the conditioning unit unchanged (if the other encoder is not integrated with the motor, the other encoder signal is circulated from the motor to the conditioning unit). Alternatively, the other encoder signal can be processed (e.g., modulated onto a suitable encoder carrier signal) and thus transmitted to the conditioning unit.

[0015] Of particular advantage is that the encoder signal and the other encoder signal are transmitted to the conditioning unit via encoder signal wires in the connecting cable. This can be achieved by modulating the encoder signal (and the other encoder signal) onto a common encoder carrier signal.

[0016] The signal interface can be designed to receive adjustment signals from the adjustment unit.

[0017] Preferably, the adjustment signal is transmitted from the adjustment unit to the motor via a connecting cable.

[0018] If the signal interface is designed to transmit encoder signals to the regulating unit and receive regulating signals from the regulating unit, then in the assembly including the motor, the regulating unit, the encoder cable, and the connecting cable, the encoder interface can be connected to the encoder via the encoder cable to receive encoder signals from the encoder, and the motor signal interface can be connected to the regulating unit via the connecting cable to transmit encoder signals to the regulating unit and receive regulating signals from the regulating unit.

[0019] If the signal interface is designed to transmit the encoder signal and the other encoder signal to the regulating unit and to receive the regulating signal from the regulating unit, then in the assembly including the motor, the regulating unit, the other encoder (which may also be integrated on the motor), the encoder, the encoder cable, and the connecting cable, the encoder interface may be connected to the encoder via the encoder cable to receive the encoder signal from the encoder, and the motor signal interface may be connected to the regulating unit via the connecting cable to transmit the encoder signal and the other encoder signal to the regulating unit and to receive the regulating signal from the regulating unit.

[0020] This further reduces cabling costs. If the encoder signal, another encoder signal, and the adjustment signal are guided via the same connecting cable, for example, via a connecting cable with two wires, only one connecting cable is needed between the adjustment unit and the motor. Only one additional encoder cable is needed between the encoder and the motor to transmit the encoder signal from the encoder to the motor. If a two-wire conductor is formed in the connecting cable, the signal is transmitted as voltage between the two wires.

[0021] Encoder cables can also be implemented as hybrid cables and transmit additional signals in addition to encoder signals. Attached Figure Description

[0022] Next, refer to Figure 1a to... Figure 4 The invention is described in detail, and these figures exemplify, schematically, and non-limitingly illustrate advantageous designs of the invention. In the figures:

[0023] Figure 1a shows a component according to the prior art, including a motor, a regulating unit, and an encoder.

[0024] Figure 1b The component shown has another encoder.

[0025] Figure 2a The present invention illustrates an assembly comprising a motor, a regulating unit, and an encoder.

[0026] Figure 2b The component shown has another encoder.

[0027] Figure 3 A preferred design scheme is shown.

[0028] Figure 4 A particularly preferred design is shown. Detailed Implementation

[0029] Figure 1a shows a known assembly including a motor 10, an adjustment unit 3, and an encoder 2. The encoder 2 transmits an encoder signal s2 directly to the adjustment unit 3 via a direct wire d2. Alternatively, the encoder signal s2 can be modulated onto an encoder carrier and transmitted via the direct wire d2. The adjustment unit 3 calculates adjustment parameters using the encoder signal s2, which are transmitted as an adjustment signal u to the motor 10 via an adjustment signal wire lu, in order to adjust the adjustment parameters of the motor 10, such as torque or speed.

[0030] exist Figure 1b The components shown in Figure 1a are additionally provided, wherein another encoder 1 is integrated here on the motor 10. The other encoder 1 provides another encoder signal s1 to the motor 10. The other encoder 1 can be used as a master encoder, and encoder 2 can be used as a slave encoder, wherein the motor 10 acts as the master device. The slave device (e.g., a roller connected to the motor 10) itself is in Figure 1b Not shown in the figure. Furthermore, the other encoder signal s1 is transmitted from the motor 10 to the adjustment unit 3 via another encoder signal line l1. This other encoder signal s1 can be transmitted directly via the other encoder signal line l1, or it can be processed first (e.g., modulated onto another encoder carrier) and then (modulatedly on the other encoder carrier) transmitted via the other encoder signal line l1. The adjustment unit 3 calculates adjustment parameters using encoder signal s2 and the other encoder signal s1. As already shown in the components of Figure 1a, the adjustment parameters are transmitted as an adjustment signal u to the motor 10 via the adjustment signal line lu to adjust the adjustment parameters of the motor 10, such as torque or speed.

[0031] In contrast, Figure 2a The diagram shows an assembly according to the invention, including a motor 10 together with an adjustment unit 3 and an encoder 2. The adjustment unit 3 is similar to that shown in Figure 1a and... Figure 1b When using encoder signal s2, the adjustment parameter is calculated and transmitted to motor 10 as adjustment signal u via adjustment signal wire lu, so as to adjust, for example, the torque and / or speed of motor 10.

[0032] However, according to the present invention, the motor 10 has an encoder interface 11, which is designed to receive encoder signal u2 from the encoder 2. For this purpose, an encoder cable 5 with encoder wires l5 can be provided, which connects the encoder 2 to the motor 10 (in... Figure 2a The encoder cable is not shown in Figure 5.

[0033] Furthermore, the motor 10 has a signal interface 12 designed to transmit the encoder signal s2 to the regulating unit 3. Therefore, the encoder 2 generates the encoder signal s2. However, unlike in Figure 1, this encoder signal is not transmitted directly to the regulating unit 3 via the direct wire d2, but rather via the encoder wire l5 to the motor 10. The motor 10 transmits the encoder signal s2 to the regulating unit 3. This can be achieved either by transmitting the encoder signal s2 itself, i.e., without alteration (i.e., through a loop), or by first processing the encoder signal s2 (preferably via a processing unit, or modulation unit) and then transmitting the encoder signal to the regulating unit 3 in a processed form (e.g., modulated onto a suitable encoder carrier signal).

[0034] In contrast, Figure 2b The middle shows Figure 2a The components, however, include another encoder 1 preferably integrated on the motor 10, wherein the other encoder 1 provides another encoder signal s1 to the motor 10. This other encoder signal s1 is transmitted from the motor 10 to the regulating unit 3 via another encoder signal wire l1. Here, the regulating unit 4 therefore calculates an adjustment parameter using encoder signal s2 and the other encoder signal u1, which is transmitted as an adjustment signal u to the motor 10 via an adjustment signal wire lu, in order to, for example, adjust the torque and / or speed of the motor 10.

[0035] Alternatively, an additional encoder (not shown) can be connected to the motor 10 via additional encoder wires, and a separate encoder signal can be transmitted to the motor 10. Preferably, the motor 10 also transmits the separate encoder signal to the regulating unit 3, either by transmitting the separate encoder signal itself, i.e., without alteration, or by first processing the separate encoder signal and then transmitting it in a processed form (preferably modulated onto the encoder carrier signal). The processing of the other encoder signal s1 can be performed by another processing unit (preferably another modulation unit) or (if any) by a processing unit (preferably a modulation unit) already configured to process (preferably modulate) the encoder signal s2.

[0036] If the motor 10 operates without the encoder 2, the encoder interface 11 can be left unused or covered. This is advantageous when the motor 10 also has another encoder 1 (which is preferably integrated into the motor 10).

[0037] Encoder 2 can be implemented as a slave encoder, and the other encoder 1 can be implemented as a master encoder. Preferably, a slave encoder is provided to detect rotational motion as an encoder signal, wherein the adjustment unit 2 adjusts linear motion or other kinematic motion and calculates adjustment parameters accordingly and transmits the adjustment parameters to the motor 10.

[0038] Therefore, a linear shaft (main shaft drive) can be configured as an encoder (especially when implemented as a slave encoder), in which a linear measurement system is installed. As another encoder 1 (especially implemented as a master encoder), a winding temperature sensor of the motor 10 can be configured, for example, where the winding temperature of the motor 10 can be set as another encoder signal s1. For example, the motor 10 (master device) can be connected to the pressure roller (slave device) via a transmission device, where an encoder 2 (as a slave device) is arranged on the pressure roller. The encoder 2, for example, transmits the rotational speed or angle of the pressure roller as an encoder signal s2 to the motor 10, which in turn transmits the encoder signal s2 to the adjustment unit 4 via the encoder signal wire l2. The motor 10 can also (if as in...) Figure 2b As shown, another encoder 1) is configured to transmit the other encoder signal s1 to the regulating unit 4, for example, via another encoder signal wire l1. The regulating unit 4 can, for example, predetermine the rated speed or rated angle as an adjustment parameter through cascade control. The adjustment parameter is transmitted to the motor 10 as an adjustment signal u via the adjustment signal wire lu, so as to, for example, adjust the torque and / or speed of the motor 10.

[0039] exist Figure 3 An advantageous design is illustrated. Here, signal interface 12 is designed to transmit encoder signal s2 and the other encoder signal s1 to adjustment unit 3. Accordingly, connecting cable 4 includes encoder signal wire l2 and another encoder signal wire l1 to transmit encoder signal u2 together with the other encoder signal s1 via connecting cable 4. Furthermore, signal interface 12 is designed to receive adjustment signal u from adjustment unit 3, therefore connecting cable 4 also includes adjustment signal wire l1 to transmit adjustment signal u from adjustment unit 3 to motor 10. To transmit encoder signal s2 to motor 10, encoder cable 5 with encoder wire l5 is preferably provided, which connects to encoder interface 11 of encoder 2 and motor 10 and thus connects encoder 2 to motor 10.

[0040] The encoder signal u2 and / or the adjustment signal u can of course be transmitted to the adjustment unit 3 / from the adjustment unit via their own connection cable. Compared with the transmission via the common connection cable 4, the cable laying cost is naturally increased.

[0041] exist Figure 4 A particularly advantageous design is illustrated. Here, encoder signal s2 and the other encoder signal s1 are transmitted together via an encoder signal wire l12 of the connecting cable 4. This can be achieved by modulating the encoder signal s2 and the other encoder signal s1 onto the encoder carrier signal of the encoder signal wire l12 (by a common modulation unit or two separate modulation units). Therefore, only one adjustment signal wire l1u and one encoder signal wire l12 are needed in the connecting cable 4. For example, a two-wire connection can be configured as the encoder signal wire l12.

Claims

1. An electric motor (10) capable of being connected to an adjustment unit (3) to receive an adjustment signal (u) from the adjustment unit (3), wherein, The motor (10) has a signal interface (12) designed to transmit encoder signals (s1) from an encoder (1) integrated on the motor (10) to the regulating unit (3). The motor (10) is characterized in that it has an encoder interface (11) designed to receive encoder signals (s2) from an encoder (2) located away from the motor (10), and the signal interface is designed to transmit encoder signals (s2) from the encoder (2) located away from the motor (10) to the regulating unit (3).

2. The electric motor (10) according to claim 1, characterized in that, The signal interface (12) is designed to transmit the encoder signal (s2) of the encoder (2) located away from the motor (10) to the regulating unit (3).

3. The electric motor (10) according to claim 1, characterized in that, The signal interface (12) is designed to transmit the encoder signal (s1) of the encoder (1) integrated on the motor (10) to the regulating unit (3) without alteration.

4. The electric motor (10) according to claim 2, characterized in that, The signal interface (12) is designed to transmit the encoder signal (s1) of the encoder (1) integrated on the motor (10) to the regulating unit (3) without alteration.

5. The electric motor (10) according to any one of claims 1 to 4, characterized in that, The signal interface (12) is designed to receive the adjustment signal (u) from the adjustment unit (3).

6. A component comprising a motor (10) according to any one of claims 1 to 5, an adjustment unit (3), an encoder (2) disposed remotely from said motor (10), an encoder (1) integrated on said motor (10), an encoder cable (5), and a connecting cable (4), wherein, The encoder interface (11) is connected to the encoder (2) located away from the motor (10) via the encoder cable (5) to receive the encoder signal (s2) of the encoder (2) located away from the motor (10), and the signal interface (12) is connected to the adjustment unit (3) via the connection cable (4) to transmit the encoder signal (s2) of the encoder (2) located away from the motor (10) and the encoder signal (s1) of the encoder (1) integrated on the motor (10) to the adjustment unit (3).

7. The component according to claim 6, characterized in that, The signal interface (12) receives the adjustment signal (u) via the connection cable (4).

8. A method for operating an electric motor (10), wherein, The encoder signal (s1) of the encoder (1) integrated on the motor (10) is transmitted to the adjustment unit (3) via the connecting cable (4). The characteristic is that the encoder signal (s2) of the encoder (2) arranged away from the motor (10) is transmitted to the motor (10) and from the motor (10) via the connecting cable (4) to the adjustment unit (3). The adjustment unit (3) determines an adjustment signal (u) using the encoder signal (s2) of the encoder (2) arranged away from the motor (10) and / or the encoder signal (s1) of the encoder (1) integrated on the motor (10) and transmits the adjustment signal to the motor (10).

9. The method according to claim 8, characterized in that, The motor (10) transmits the encoder signal (s2) of the encoder (2) located away from the motor (10) to the regulating unit (3) without alteration.

10. The method according to claim 9, characterized in that, The encoder signal (s2) of the encoder (2) located away from the motor (10) and the encoder signal (s1) of the encoder (1) integrated on the motor (10) are transmitted to the adjustment unit (3) via the adjustment signal wire (l12) of the connecting cable (4).

11. The method according to any one of claims 8 to 10, characterized in that, The adjustment signal (u) is transmitted from the adjustment unit (3) to the motor (10) via the connection cable (4).

Images