Electronic drive controller, electronic drive controller assembly, and electric motor assembly

Abstract

An electronic drive controller for driving an electric motor is provided, the electronic drive controller comprising a reference connector connected to a potential reference, an analog input connector and an analog output connector. The electronic drive controller comprises a sensor interface circuit connected to the reference connector, the analog input connector and the analog output connector, wherein the sensor interface circuit is configured for operating a resistance temperature detector having at least three wires for temperature measurement with wire resistance compensation via the analog output connector applying an excitation current. An electronic drive controller assembly comprising the electronic drive controller and an electric motor assembly are also provided.

Description

Technical Field

[0001] This invention relates to an electronic drive controller for driving an electric motor (e.g., an AC motor). It also relates to an electronic drive controller assembly including a resistance temperature detector and an electronic drive controller, and an electric motor assembly including an electric motor, a resistance temperature detector, and an electronic drive controller. Background Technology

[0002] Electric motors are typically driven by electronic drive controllers. The electronic drive controller supplies power to the electric motor to operate it.

[0003] Electric motors are also typically used in systems that require accurate measurement of at least one temperature.

[0004] For example, electric motors can be used in heating, ventilation, and air conditioning (HVAC) systems and should accurately measure the temperature of at least one room.

[0005] Temperature is known to be measured using a resistance temperature detector (RTD). The RTD consists of a temperature sensing resistor. The ohmic resistance of the temperature sensing resistor changes with temperature. A sensor interface circuit allows current to flow through the RTD and senses the voltage drop across it. By assuming that the voltage drop is primarily caused by the (temperature-dependent) ohmic resistance of the temperature sensing resistor, the change in temperature can be derived from the measured change in voltage drop.

[0006] A standard resistance temperature detector consists of two wires connecting the temperature sensing resistor to the sensor interface circuitry. The wires themselves exhibit some ohmic resistance. This ohmic resistance can vary depending on the wire's length, temperature, cross-sectional area, and other factors. Therefore, the ohmic resistance of the wires can detract from the accuracy of temperature measurements.

[0007] In other applications, resistance temperature detectors with at least three wires have been proposed. The basic idea is that the excitation current used for the temperature sensing resistor passes through only two wires, and the other wires (one or more) are used to correct for the influence of the wire resistance.

[0008] Currently, sensor interface circuitry is supplied as a separate unit. This unit includes specific hardware and interface connectors that can only be used to operate the resistance temperature detector. This separate unit results in additional cost, complexity, and installation effort. Utility Model Content

[0009] The problem this invention aims to solve is to provide a cost-effective method for accurate measurement in systems including electric motors (e.g., HVAC systems).

[0010] This problem is solved by an electronic drive controller for driving an electric motor having the features of claim 1.

[0011] The electronic drive controller includes: a reference connector connected to a potential reference, an analog input connector, and an analog output connector.

[0012] The electronic drive controller also includes a sensor interface circuit, which is connected to the reference connector, the analog input connector, and the analog output connector.

[0013] The sensor interface circuit is configured to operate a resistance temperature detector with at least three wires to apply an excitation current via the analog output connector to perform temperature measurement with wire resistance compensation.

[0014] In other words, the sensor interface circuit (and therefore the electronic drive controller) is configured for at least a multi-wire mode. Multi-wire mode is the operating mode in which the sensor interface circuit (and therefore the electronic drive controller) uses a resistance temperature detector (RTD) with wire compensation for temperature measurement.

[0015] This requires the resistance temperature detector to have at least three leads, such as three or four leads. For example, the sensor interface circuit (and therefore the electronic controller) is configured for three-lead and / or four-lead modes. Three-lead mode is a mode that uses an RTD with lead compensation resistors, and uses the three leads of that RTD for temperature measurement. Four-lead mode is a mode that uses an RTD with lead compensation resistors, and uses the four leads of that RTD for temperature measurement.

[0016] The sensor interface circuitry is integrated into the electronic drive controller. No separate housing is required for the sensor interface circuitry, resulting in less installation space. Users do not need to install the sensor interface circuitry separately from the electronic drive controller. This reduces installation workload. Furthermore, it reduces the risk of incorrect installation and misoperation.

[0017] The potential reference can be, for example, a ground reference, or a potential offset from a ground reference. The offset can be predetermined or adjustable.

[0018] The reference connector can be a grounding connector.

[0019] Optionally, the sensor interface circuitry (and therefore the electronic drive controller) is additionally configured for temperature measurement using a resistance temperature device (RTD) without wire compensation, also known as two-wire mode. In this mode, it uses only the two wires of the RTD for temperature measurement.

[0020] In other words, the sensor interface circuit can be configured to operate in at least one of the three-wire and four-wire modes on the one hand, and in the other hand, in the two-wire mode on the other hand.

[0021] In particular, the operation of the sensor interface circuit (and therefore the electronic drive controller) can be switched between the following modes: - Between the three-wire pattern and the two-wire pattern; - Between the four-wire pattern and the two-wire pattern; - Between the three-wire pattern and the four-wire pattern; or - Between two-wire mode, three-wire mode and four-wire mode.

[0022] The electronic drive controller can be configured such that any one, several, or all of the reference connector, analog input connector, and analog output connector can be used for other purposes when temperature measurement is not required. This increases the flexibility of the electronic drive controller while saving the cost and space required for additional connectors for other purposes.

[0023] The analog output connector and the ability to supply current are advantageously used to apply excitation current, enabling temperature measurements with wire resistance compensation in a particularly efficient, inexpensive, and simple manner.

[0024] Generally, an RTD includes a temperature sensing resistor and at least two leads. To allow temperature measurement with lead resistance compensation, the RTD must include at least three leads, such as three or four leads. These leads are connected to the temperature sensing resistor. The first and second leads of the at least three leads are connected to different sides (different terminals) of the temperature sensing resistor and are used to allow excitation current to flow through it. The third lead of the at least three leads is connected to the temperature sensing resistor in parallel with one of the first and second leads, for example, in parallel with the first lead to the first side of the temperature sensing resistor. (Optional) A fourth lead is connected to the temperature sensing resistor in parallel with the other of the first and second leads, for example, in parallel with the second lead to the second side of the temperature sensing resistor.

[0025] The temperature sensing resistor can be installed inside the electric motor, and the at least three wires can be connected to the sensor interface circuit integrated in the electronic drive controller.

[0026] The electronic drive controller is configured such that a first wire of at least three wires (of the resistance temperature detector) can be connected to an analog output connector, a second wire of at least three wires can be connected to a reference connector, and a third wire of at least three wires can be connected to an analog input connector.

[0027] The sensor interface controller can be configured to sense the voltage drop between the analog input connector and the reference connector. This voltage drop is affected by the (temperature-dependent) ohmic resistance of the temperature sensing resistor (and therefore by the temperature in the electric motor). For example, this voltage drop can be used to calculate the voltage drop across the temperature sensing resistor, i.e., in two-wire mode.

[0028] The sensor interface controller is configured, in multi-wire mode, to improve the accuracy of determining the ohmic resistance of the temperature sensing resistor (and thus the accuracy of temperature measurement) by compensating for the ohmic resistance of the first and second wires using one or more additional wires (e.g., a third wire). In principle, it compensates for the resistance in the two wires (the first and second wires) that provide the current flowing through the temperature sensing resistor.

[0029] In many cases, conductor resistance compensation in a three-conductor configuration is sufficient. It can be assumed that the ohmic resistances of the two conductors supplying current to the temperature sensing resistor are consistent. By measuring and estimating the resistance of one conductor supplying current to the temperature sensing resistor, the resistance of the other conductor can be estimated. The resistances of the two conductors supplying current to the RTD will then be consistent.

[0030] The sensor interface circuitry is configured to supply excitation current at the first side of the temperature sensing resistor via the analog output connector. The sensor interface circuitry can also be configured such that the excitation current (when applied through the analog output connector) does not travel through the analog input connector. The sensor interface circuitry can be configured such that the full excitation current at the second side of the temperature sensing resistor (at least substantially) travels only through the reference connector, and / or such that the full excitation current at the first side of the temperature sensing resistor (at least substantially) travels only through the analog output connector. In particular, the sensor interface circuitry can present a higher impedance to the current flowing between the analog output connector and the analog input connector compared to the impedance of the current flowing through the analog output connector and the reference connector.

[0031] According to one aspect, the sensor interface circuit may include a compensation detection circuit. The voltage compensation detection circuit can be configured to use the voltage difference between the analog output connector and the analog input connector. In particular, it can use the potential at the analog output connector and the potential at the analog input connector as electrical inputs. It can be configured to detect the voltage drop across the temperature sensing resistor of the resistance temperature detector, for example, using the voltage difference between the analog output connector and the analog input connector. The first and third leads of the resistance temperature device can be connected in parallel to the first side of the temperature sensing resistor. In operation, the first lead of the resistance temperature device can be connected to the analog output connector, and the third lead can be connected to the analog input connector. Therefore, the temperature sensing resistor is located "outside" the electrical connection between the analog output connector and the analog input connector. If an excitation current is applied via the analog output connector, this excitation current flows through the first and second leads, but not through the third lead. Since no excitation current flows through the third lead in this case, there is no voltage drop across the third lead. Therefore, the voltage difference between the analog output connector and the analog input connector at least indicates the voltage drop across the first lead (and thus the ohmic resistance of the first lead). This can be used for lead resistance compensation.

[0032] In one embodiment, the compensation detection circuit includes a differential amplifier (e.g., an OPAMP or operational amplifier). The differential amplifier may include a first input and a second input. The first input may be connected to an analog output connector, and the second input may be connected to an analog input connector. Due to the high input impedance of the differential amplifier, the excitation current supplied by the analog output connector (at least not a substantial portion of the excitation current) will not flow through the analog input connector.

[0033] The differential amplifier in the compensation detection circuit may also include an amplifier output. This differential amplifier can be configured to, for example, output an output signal (e.g., an output voltage) indicating the voltage drop across the thermal sensing resistor at its amplifier output.

[0034] The amplifier output can be connected to the first input via an ohmic resistor (referred to as the feedback ohmic resistor). The first input can be connected to the analog output connector via an ohmic resistor (referred to as the connector link ohmic resistor). In one respect, the feedback ohmic resistor and the connector link ohmic resistor are the same.

[0035] The first input terminal can be an inverter input terminal.

[0036] During operation, the current through the feedback ohmic resistor and / or through the connector link ohmic resistor can be less than the excitation current, especially much smaller.

[0037] The compensation detection circuit may include an analog-to-digital converter (ADC). It can be referred to as a signal ADC. The signal ADC can be coupled to the amplifier output of the compensation detection circuit. The signal ADC allows scanning of the differential amplifier. Furthermore, the signal ADC can be connected to a potential reference. For example, the signal ADC can be configured to provide, for instance, a digital signal to a microcontroller (MCU) indicating the voltage drop across the thermal sensing resistor.

[0038] In one embodiment, the analog-to-digital converter (i.e., signal ADC) of the compensation detection circuit is coupled to the amplifier output of the compensation detection circuit via a low-pass filter. This low-pass filter suppresses high-frequency disturbances, such as those caused by interference. This improves measurement accuracy.

[0039] According to one aspect, the sensor interface circuit may include a pass-through detection circuit for detecting the voltage between the analog input connector and the reference connector. This circuit may also be referred to as a two-wire mode detection circuit. In the two-wire mode, only the two wires of the RTD are used. Both wires then participate in providing excitation current flowing through the temperature sensing resistor. In the two-wire mode, one of the two wires is connected to the reference connector, and the other wire is connected to the analog input connector. In this case, an excitation current can be applied through the analog input connector.

[0040] A temperature sensing resistor is connected in series between one analog input connector and the other reference connector. The voltage between the analog input connector and the reference connector is generated in part "through" the temperature sensing resistor and is affected by the temperature-dependent ohmic resistance of the temperature sensing resistor. Therefore, the temperature change at the temperature sensing resistor can be measured based on the voltage between the analog input connector and the reference connector.

[0041] A pass-through detection circuit may include an analog-to-digital converter, which may be referred to as a pass-through detection ADC. The pass-through detection ADC is coupled to an analog input connector. Furthermore, the pass-through detection ADC may be connected to a potential reference, particularly a reference connector. For example, the pass-through detection ADC may be configured to provide a digital signal to a microcontroller, indicating the voltage between the analog input connector and the reference connector.

[0042] In one embodiment, the analog-to-digital converter (i.e., the pass-through detection ADC) of the pass-through detection circuit is coupled to the analog input connector via a buffer and / or a low-pass filter. The low-pass filter suppresses high-frequency disturbances, such as those caused by interference. This improves measurement accuracy. The buffer helps to stabilize the voltage measurement between the analog input connector and the reference connector.

[0043] Shot-through detection circuitry (especially buffers, low-pass filters for shot-through detection circuitry, and / or shot-through detection ADCs) can be configured to prevent any (substantial) current from flowing between the analog input connector and the reference connector when excitation current is applied via the analog output connector (e.g., in three-wire and four-wire modes).

[0044] According to one aspect, the electronic drive controller includes an analog output current applicator connected to an analog output connector. Specifically, the sensor interface circuitry may include the output current applicator. The output current applicator can be configured to apply an excitation current via the analog output connector, particularly between the analog output connector and a reference connector (and therefore relative to a potential reference). The output current applicator is used to apply excitation in at least one multi-wire mode (possibly several or all of the multi-wire modes). For example, the output current applicator applies excitation current in both three-wire and four-wire modes.

[0045] In particular, the analog output current applicator can be configured to set the excitation voltage to at least one predetermined value. The predetermined value can be in the range of 1V to 10V. In one embodiment, the analog output current applicator is configured to apply an adjustable excitation voltage, for example, in the voltage range of 0V to 10V.

[0046] Additionally or alternatively, the analog output current applicator is configured to set an excitation current. In particular, the analog output current applicator can be configured to set the excitation current to at least one predetermined value. The predetermined value can be in the range of 0 mA to 20 mA. In one embodiment, the analog output current applicator is configured to apply an adjustable excitation current, for example, in the current range of 0 mA to 20 mA.

[0047] This allows for the use of different excitation voltages / currents for different types of temperature sensing resistors. For example, the electronic drive controller can be adjustable to apply a first excitation voltage / current or a second excitation voltage / current different from that first. For instance, the first excitation voltage / current can be used for measuring a Pt100 type temperature sensing resistor (with a resistance of 100Ω at 0°C), and the second excitation voltage / current can be used for measuring a Pt1000 type temperature sensing resistor (with a resistance of 1000Ω at 0°C). To reduce the effect of "self-heating" of the temperature sensing resistor, it is advantageous to keep the excitation voltage / current low.

[0048] The output current applicator can be connected to a microcontroller. In particular, the output current applicator can be controlled by the microcontroller.

[0049] As described above, the sensor interface circuit can be configured to operate (e.g., a resistance temperature detector with only two wires) for temperature measurements without wire resistance compensation. In other words, the sensor interface circuit can switch between temperature measurements with and without wire resistance compensation. This increases versatility. For example, the sensor interface circuit can be configured to perform temperature measurements without wire resistance compensation using only the analog input connector and the reference connector. The sensor interface circuit / electronic drive controller can be configured such that when the sensor interface circuit operates the resistance temperature detector without wire resistance compensation, the analog output port can be used for other purposes.

[0050] In one embodiment, the electronic drive controller additionally includes a current applicator connected to the analog input connector. This current applicator may be referred to as a second current applicator. The second current applicator can be used to apply excitation in a two-wire mode. In particular, the sensor interface circuitry may include the second current applicator. The second current applicator can be configured to apply an adjustable excitation current, for example, in the range of 0mA to 20mA, between the analog input connector and the reference connector. The second current applicator can be connected to and operated by a microcontroller.

[0051] The microcontroller can be configured to switch between operation of a sensor interface circuit with wire resistance compensation (e.g., excitation using an output current applicator) and operation of a sensor interface circuit without wire resistance compensation (e.g., excitation using a second current applicator).

[0052] The electronic drive controller can be configured to automatically shut off the output current applicator when the second current applicator is operated, and / or automatically shut off the second current applicator when the output current applicator is operated.

[0053] In one embodiment, a single current applicator can be used as both an output current applicator and a second current applicator. For example, the sensor interface circuit may include a switching unit for switching the electrical connection of the single current applicator to an analog output connector on one side and an analog input connector on the other. The switching unit may include at least one semiconductor switch. Additionally or alternatively, the switching unit may be controlled by a microcontroller.

[0054] The electronic drive controller may include an external communication interface. External communication may include a wireless network interface, a wired network interface, a fieldbus interface, or Bluetooth. TM Interface, ZigBee TMAny one, several, or all of the following: an interface, a mobile phone interface, etc. An external communication interface may be coupled to a microcontroller and / or included within the microcontroller. The electronic drive controller may be configured to receive operating commands via the communication interface and / or transmit or send measurement data via the communication interface.

[0055] In one embodiment, the electronic drive controller is configured to supply power to the electric motor with an alternating current having an adjustable frequency (e.g., at least in the range of 0 Hz to 100 Hz).

[0056] An electronic drive controller may include drive circuitry for supplying power to an electric motor, wherein the drive circuitry includes an inverter stage. The inverter stage may include a semiconductor switch. The semiconductor switch may be controlled by a microcontroller. The inverter stage allows the power supply to be adapted to the electric motor.

[0057] In one embodiment, the reference connector, analog input connector, and analog output connector are formed in a single connector terminal. This facilitates production and reduces manufacturing costs.

[0058] An electronic drive controller may include a housing, particularly a single housing. All components of the drive controller can be mounted in the same housing.

[0059] According to one aspect, the sensor interface circuitry is formed on an add-on module for insertion into an electronic drive controller. In addition to the main circuit board of the electronic drive controller, the sensor interface circuitry can also be formed on a separate circuit board (e.g., a printed circuit board, PCB). For example, a microcontroller is attached to the main circuit board. The separate circuitry may include internal connection terminals for electrical connection to the main circuit board. This allows for flexible and cost-effective production of electronic drive controllers with and without sensor interface circuitry. Optionally, a reference connector, analog input connector, and analog output connector (which may be a single connector terminal, if applicable) are also formed as part of the add-on module. The reference connector, analog input connector, and analog output connector (which may be a single connector terminal, if applicable) can be attached to a separate circuit board.

[0060] In one embodiment, the electronic drive controller includes additional connectors, and the sensor interface circuitry includes a reference detection circuit for detecting the voltage between the additional connector and a reference connector. A second lead and other leads (e.g., a fourth lead) of the resistive temperature device can be connected in parallel to a second side of the temperature sensing resistor. In operation, the second lead of the resistive temperature device is connected to the reference connector, and the other leads are connected to the other connector. Therefore, the temperature sensing resistor is located “outside” the electrical connection between the reference connector and the other connector. Because the excitation current flows through the second lead but not through the other lead, the voltage between the reference connector and the other connector indicates the ohmic resistance of the other lead. This can be used to compensate for the ohmic resistance of the second lead for temperature measurement. This information can also be used to compensate for the ohmic resistance of the first lead if it is assumed that the ohmic resistance of the other lead and the ohmic resistance of the first lead (which is connected to the analog output connector) are (at least substantially) the same. Especially in this case, the compensation detection circuitry described above can be omitted.

[0061] A reference detection circuit can be formed similarly to the compensation detection circuit described above.

[0062] In one embodiment, the reference sensing circuit includes a differential amplifier (e.g., an OPAMP or operational amplifier). The differential amplifier may include a first input and a second input. The first input may be connected to the other connector, and the second input may be connected to the analog input connector. Due to the high input impedance of the differential amplifier, the excitation current supplied through the analog output connector (or through the analog input connector by means of a second current applicator) (at least not a substantial portion of the excitation current) does not flow through the other connector. Since no current flows through the other conductor, there is no voltage drop across it. Therefore, the potential at the other connector is the same as the potential at the second side of the temperature sensing resistor. Thus, the voltage (more precisely, the potential difference) between the other connector and the reference connector indicates the voltage drop across the fourth conductor through which the excitation current flows. This can be used for conductor resistance compensation.

[0063] The differential amplifier in the reference detection circuit may also include an amplifier output. This differential amplifier can be configured to output an output signal (e.g., a voltage) at its amplifier output terminal.

[0064] The reference detection circuit may include an analog-to-digital converter (ADC), which may be referred to as a reference ADC. In particular, the reference ADC may be coupled to the amplifier output (of the amplifier in the reference detection circuit). Furthermore, the reference ADC may be connected to an electrical reference potential (e.g., ground). The reference ADC allows scanning the output signal of the differential amplifier (of the ground reference circuit).

[0065] In one embodiment, the analog-to-digital converter (i.e., the ground-referenced ADC) of the reference detection circuit is coupled to the amplifier output (of the reference detection circuit) via a low-pass filter. This low-pass filter suppresses high-frequency disturbances, such as those caused by interference. This improves measurement accuracy.

[0066] Generally, a sensor interface circuit may include: -Detection circuit; or - Reference detection circuit; or - Both the compensation detection circuit and the reference detection circuit.

[0067] According to one aspect, the electronic drive controller may include a microcontroller. The microcontroller may be connected to or may include a signal ADC. Additionally or alternatively, the microcontroller may be connected to or may include a pass-through ADC. Additionally or alternatively, the microcontroller may be connected to or may include a reference ADC. The microcontroller may be configured to process the acquired data and calculate the temperature at the (temperature-dependent) ohmic resistance of the temperature sensing sensor and / or the temperature sensing resistor.

[0068] According to one aspect, in the four-wire mode, the excitation current travels through a temperature sensing resistor via a pair of current-carrying wires (e.g., the first and third wires). The voltage drop across the temperature-sensitive resistor can be measured via a pair of sensing wires (e.g., the second wire and the other wire (the fourth wire)). Since no current actually flows through any of the sensing wires, there is no voltage drop or only a negligible voltage drop across the sensing wires.

[0069] The above-mentioned problems are further solved by the electronic drive controller assembly according to claim 13.

[0070] The electronic drive controller assembly includes a resistance temperature detector with at least three wires; and An electronic drive controller for operating an electric motor according to any of the embodiments disclosed herein; The first wire of the (at least three) wires is connected to the analog output connector, the second wire of the (at least three) wires is connected to the reference connector, and the other wires of the (at least three) wires are connected to the analog input connector or to other connectors of the resistance temperature detector.

[0071] For example, the other wire may be connected to the analog input connector (see “Third Wire” as described above). In this case, the other connector may be omitted. Alternatively, the other wire may be connected to the other connector (see “Other Wires” as described above). In one embodiment, the other wire (first other wire) is connected to the analog input connector, and the second other wire (fourth wire) is connected to the other connector.

[0072] The embodiments, modifications, and advantages disclosed with respect to the electronic drive controller apply accordingly, and vice versa.

[0073] Resistance temperature detectors can include temperature sensing resistors. These resistors can be platinum measuring resistors, such as Pt100 or Pt1000. They can also be silicon resistance sensors (especially KTY sensors), negative temperature coefficient thermistors (NTC thermistors), or positive temperature coefficient thermistors (PTC).

[0074] The above-mentioned problems are further solved by the electric motor assembly according to claim 14.

[0075] The electronic drive controller assembly includes: Electric motor; A resistance temperature detector with at least three wires; and An electronic drive controller for operating an electric motor according to any of the embodiments disclosed herein; The temperature sensing resistor of the resistance temperature detector is housed within the electric motor.

[0076] Because the resistance temperature detector is located inside the electric motor, the internal temperature of the electric motor can be easily measured. Integrating the sensor interface circuitry into the electronic drive controller reduces the size and manufacturing cost of the assembly. Furthermore, the assembly is easier to install and reduces the risk of incorrect installation. All components can be adapted to fit together.

[0077] The embodiments, modifications, and advantages disclosed with respect to the electronic drive controller apply accordingly, and vice versa.

[0078] The embodiments, modifications, and advantages disclosed with respect to the electronic drive controller assembly are applicable accordingly, and vice versa.

[0079] Additional features, advantages, and possible applications of this invention are derived from the following description of exemplary embodiments and the accompanying drawings. All features described and / or illustrated herein, individually or in any desired combination, form the subject matter of this invention, regardless of how they are combined in the claims or in their references to preceding claims. Attached Figure Description

[0080] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings, in which:

[0081] Figure 1 A first embodiment of an electric motor assembly is schematically shown, the assembly comprising an electric motor, an electronic drive controller for driving the electric motor, and a resistance temperature device. The resistance temperature device includes a temperature sensing resistor and three wires attached to the temperature sensing resistor and electrically connected to a connector of the electronic drive controller. The electronic drive controller includes a sensor interface circuit for operating the resistance temperature device to perform temperature measurements with wire resistance compensation.

[0082] Figure 2 It schematically shows the relationship with Figure 1 A second embodiment of a similar electric motor assembly includes a resistance temperature device comprising four wires attached to a temperature sensing resistor and electrically connected to a connector of an electronic drive controller; and

[0083] Figure 3 The first embodiment is schematically shown, wherein the resistance temperature device includes a temperature sensing resistor and only two wires attached to the temperature sensing resistor and electrically connected to a connector of an electronic drive controller, wherein Figure 1 The sensor interface circuit shown is therefore used by the electronic drive controller. Figure 3 The temperature measurement is performed using a two-wire mode without wire compensation.

[0084] Figure 4 It shows the relationship with Figure 1 The same assembly is used, with the modification that the temperature sensing resistor is used as a room temperature sensor for heating, ventilation and air conditioning (HVAC) systems. Detailed Implementation

[0085] Figure 1 An electric motor assembly 100 is schematically shown. The electric motor assembly 100 includes an electric motor 90, an electronic drive controller 101 for supplying power to the electric motor 90 to drive the electric motor 90, and a resistance temperature device 170.

[0086] The resistance temperature device 170 includes a temperature sensing resistor 175 (e.g., a platinum measuring resistor, such as Pt100 or Pt1000), a first lead 171, a second lead 172, and a third lead 173. The temperature sensing resistor 175 can be installed, for example, in an electric motor 90. Figure 1As shown, it is installed inside the housing 91 of the electric motor 90. For example, the temperature sensing resistor 175 may be located near the windings of the electric motor 90.

[0087] Different temperatures may occur during the operation of the electric motor 90. The temperature in the electric motor 90 can depend on the ambient temperature, the fluid flow (such as air flow) used to cool the electric motor 90, the mechanical load driven by the electric motor 90, the operating speed of the electric motor 90, etc.

[0088] Excessive temperature may damage the electric motor 90. Furthermore, high temperature may also indicate that the mechanical load applied to the electric motor 90 is too high, for example, due to malfunction of the machinery driven by the electric motor 90, poor lubrication, or unexpected high load. In addition, if the motor temperature is very high or very low, the standard operating parameters for the electric motor 90 may not be optimal. In such cases, the efficiency of the electric motor 90 may decrease.

[0089] However, the temperature sensing resistor 175 can be placed at any desired location. The location of the temperature sensing resistor 175 is not limited to the electric motor 90. If the temperature sensing resistor 175 is placed at any desired location, the advantages of using the electric drive controller 101 to drive the electric motor 90 and to perform temperature detection using the temperature resistor detector 170 also apply.

[0090] As an example, Figure 4 An electric motor assembly 400 is shown. This electric motor assembly is... Figure 1 The electric motor assembly 100 shown is a minor modification. The only difference is that the temperature sensing resistor 175 is used as a temperature sensor for heating, ventilation, and air conditioning (HVAC) systems. Figure 4 In a non-limiting example, temperature sensing resistor 175 is placed in room 495 and used as a room temperature sensor for an HVAC system.

[0091] besides, Figure 4 Corresponding to Figure 1 Therefore, a more detailed description is not required.

[0092] exist Figure 1 and Figure 4In this configuration, a first wire 171 and a second wire 172 are connected to opposite sides of a temperature sensing resistor 175, specifically at opposite ends along which current flows through the temperature sensing resistor 175. The first wire 171 is connected to a first side of the temperature sensing resistor 175, and the second wire 172 is connected to a second side of the temperature sensing resistor 175. Therefore, the temperature sensing resistor 175 is connected in series between the first wire 171 and the second wire 172. A third wire 173 is also connected to the first side of the temperature sensing resistor 175, in parallel with the first wire 171. The first wire 171 has a first ohmic resistance R171, the second wire 172 has a second ohmic resistance R172, and the third wire 173 has a third ohmic resistance R173. For the purposes of this description, it is assumed that at least the ohmic resistances R171 and R172 are (at least substantially) the same.

[0093] The electronic drive controller 101 includes: a housing 102, a microcontroller 103 (MCU), a communication interface 104, a power input terminal 105, a drive circuit 106, a motor current output terminal 107, and an optional memory 108. The communication interface 104, the drive circuit 106, and the memory 108 are connected to the microcontroller 103 and can be controlled by the microcontroller 103 respectively.

[0094] The communication interface 104 can be used to receive data, such as command instructions for the electronic drive controller 101. The communication interface 104 can also be used to send or transmit data from the electronic drive controller 101, such as measurement data.

[0095] The power input terminal 105 can be connected to an external power source 80, such as an AC or DC power source. The motor current output terminal 107 is connected to the electric motor 90 to supply power from the drive circuit 106 to the electric motor 90.

[0096] The drive circuit 106 includes an inverter stage 161 for adapting the power supplied to the electric motor 90. The inverter stage 161 may include a semiconductor switch controllable by a microcontroller 103. The electronic drive controller 101 is configured to supply power to the electric motor 90 with an alternating current having an adjustable frequency (e.g., in the range from 0 Hz to 100 Hz).

[0097] The electronic drive controller 101 has a connector terminal 125, which includes at least an analog output connector 121, a reference connector 122, and an analog input connector 123. The reference connector 122 is connected to an electrical reference potential, such as ground reference GND. Therefore, the reference symbol GND is used exemplarily for the electrical reference potential. The electrical reference potential can also be a potential that has a certain offset from the ground potential.

[0098] The first wire 171 of the resistance temperature device 170 can be connected to (and in Figure 1 (actually connected to) analog output connector 121, the second wire 172 can be connected to (and in) Figure 1 The reference connector 122 is actually connected to the reference connector, and the third wire 173 can be connected to (and in Figure 1 (The actual connection is to) analog input connector 123.

[0099] Furthermore, the electronic drive controller 101 includes a sensor interface circuit 130. This sensor interface circuit 130 is adapted to operate a resistance temperature device 170 to allow measurement of the temperature-dependent ohmic resistance of a temperature sensing resistor 175. Therefore, the temperature of this temperature sensing resistor 175, corresponding to the motor temperature (see [link to relevant documentation]), can be determined using the electronic drive controller 101. Figure 1 ) or room temperature (see Figure 4 ).

[0100] The sensor interface circuit 130 includes an analog output current applicator 132 connected to an analog output connector 121 and configured to apply an excitation current (between analog output connector 121 and a potential reference GND, and thus between analog output connector 121 and reference connector 122) via the analog output connector 121. For example, the excitation current can be set to any desired value in the range of 0mA to 20mA. Alternatively, the excitation voltage UEX can be set to any desired value in the range of 0V to 10V. The analog output connector 121 can be connected to a microcontroller 103 (not shown) and can be controlled by the microcontroller 103, for example, to toggle the analog output connector 121 on and off, and / or to set and change the desired value of the excitation voltage UEX.

[0101] In the three-wire pattern (such as) Figure 1 and Figure 4 (as shown) and four-wire pattern (as shown) Figure 2 As shown, an excitation voltage UEX / excitation current is applied by an analog output current applicator 132. The excitation current flows from the analog output connector 121 through a first lead 171, a temperature sensing resistor 175, and a second lead 172 to the reference connector 122. The ohmic resistance R171 of the first lead 171 causes a first voltage drop U1, the temperature-dependent ohmic resistance of the temperature sensing resistor 175 causes a temperature-dependent voltage drop UTD, and the ohmic resistance R172 of the second lead 172 causes a second voltage drop U2.

[0102] The sensor interface circuit 130 includes a through-detection circuit 140 for detecting the voltage Um between the analog input connector 123 and the reference connector 122.

[0103] This also allows for Figure 3 The two-wire pattern shown is particularly useful for temperature measurement. The pass-through detection circuit 140 includes a buffer 141, a low-pass filter 142, and an analog-to-digital converter 143 connected in series. The analog-to-digital converter 143 is also referred to as the pass-through detection ADC 143. The input of the buffer 141 is connected to the analog input connector 123, the input of the low-pass filter 142 is connected to the output of the buffer 141, and the input of the pass-through detection ADC 143 is connected to the output of the low-pass filter 142. The pass-through detection ADC 143 is connected to ground reference GND, which serves as an exemplary potential reference. The output of the pass-through detection ADC 143 provides a signal indicating the measured voltage Um and is connected to the microcontroller 103.

[0104] Furthermore, the sensor interface circuit 130 includes a compensation detection circuit 150 for detecting the voltage drop UTD across the temperature sensing resistor 175. It uses the voltage difference U13 between the analog output connector 121 and the analog input connector 123. The compensation detection circuit 150 includes a differential amplifier 151, a low-pass filter 152, and an analog-to-digital converter 153 connected in series. The analog-to-digital converter 153 is also referred to as the signal ADC 153.

[0105] The first input terminal 151a of the differential amplifier 151 is the inverting input terminal. This first input terminal 151a is connected to the analog output connector 121 via an ohmic resistor 154, which is referred to as the connector link ohmic resistor 154.

[0106] The second input terminal 151b of the differential amplifier 151 is a non-inverting input and is connected to the analog input connector 123.

[0107] The amplifier output terminal 151c of the differential amplifier 151 is connected to the first input terminal 151a via an ohmic resistor 155. This ohmic resistor 155 is referred to as the feedback ohmic resistor 155. In other words, the amplifier output terminal 151c is electrically connected to the first input terminal 151a via an electrical connection with the feedback ohmic resistor 155.

[0108] The connector link resistor 154 and the feedback resistor 155 can have the same resistance value. This resistance value can be relatively high, for example, higher than the nominal resistance of the temperature sensing resistor 175, and higher than the ohmic resistances R171, R172, and R173 of the wires 171, 172, and 173, respectively. For example, the resistance values ​​of the connector link resistor and the feedback resistor can be at least 10 kΩ.

[0109] exist Figure 1 and Figure 4 In the three-wire mode shown, the excitation current for the resistance temperature device 170 is applied by the analog output current applicator 132 via the analog output connector 121.

[0110] The pass-through detection circuit 140 and the compensation detection circuit 150 are configured to prevent the excitation current supplied by the analog output connector 121 from flowing through the analog input connector 123, and thus prevent it from flowing through the third wire 173. For example, the differential amplifier 151 and the buffer 141 have high impedance.

[0111] Since no current (or at least virtually no current) flows through the third conductor 173, the voltage drop U3 across it is zero (or at least negligible). Because U3 = 0, the following applies: UTD = Um - U2 - U3 = Um - U2, and U1 = U13 - U3 = U13. Since R171 = R172, and since the same excitation current flows through the first conductor 171 and the second conductor 172, we arrive at: U1 = U2, and therefore UTD = Um - U2 = Um - U1 = Um - U13.

[0112] In both three-wire and four-wire operation, the current flowing from the analog output current applicator 132 to the differential amplifier 151 is much smaller than the excitation current (e.g., at most a quarter). Due to feedback at the differential amplifier 151, the voltage at the first input terminal 151a is (at least substantially) the same as the voltage at the second input terminal 151b, and is therefore U2 + UTD. Therefore, the voltage drop across the connector link ohmic resistor 154 must correspond to U1 (i.e., the voltage drop across the first wire 171).

[0113] Furthermore, the voltage drop across the connector link ohmic resistor 154 and the voltage drop across the feedback ohmic resistor 155 are the same. Therefore, the voltage at the output terminal 151c of the differential amplifier 151 of the compensation detection circuit 140 corresponds to UTD.

[0114] In other words, the output of differential amplifier 151 generates a signal indicating a temperature-dependent voltage UTD.

[0115] The output terminal 151c is connected to the input terminal of the low-pass filter 152. The output terminal of the low-pass filter 152 is connected to the input terminal of the signal ADC 153. The output terminal of the signal ADC 153 provides a signal indicating the temperature-dependent voltage UTD and is connected to the microcontroller 103.

[0116] Finally, the temperature-dependent ohmic resistance RTD (not shown in the figure) of the temperature sensing resistor 175 can be calculated based on the equation RTD = UTD / IEX, where IEX is the excitation current (not shown in the figure). If IEX is assumed to be constant, then RTD is proportional to UTD.

[0117] Therefore, in the three-wire mode, the microcontroller 103 can calculate the RTD and / or temperature of the temperature sensing resistor 175 based on the output of the compensation detection circuit 150.

[0118] Because of the three wires 171, 172, 173 and the compensation detection circuit 150, and assuming R171 = R172, any influence of the ohmic resistors R171 and R172 on the measurement can be compensated. Therefore, the sensor interface circuit 130 is configured to perform temperature measurement with wire resistance compensation using the resistance temperature device 170 having at least three wires 171, 172, 173.

[0119] However, the electronic drive controller 101 (in particular the sensor interface circuit 130) may additionally or alternatively include other current applicators 131 connected to the analog input connector 121.

[0120] The sensor interface circuit 130 can also be configured to perform temperature measurement using a resistance temperature device 370 with at least two wires 372, 373 (i.e., in two-wire mode) without wire resistance compensation. This is in Figure 3 The diagram shows an electric motor assembly 300. This electric motor assembly 300 includes components related to… Figure 1 and Figure 4 The same electronic drive controller 101 is shown, but it has a resistance temperature device 370 instead of a resistance temperature device 170.

[0121] Resistance temperature device 370 and its operation are similar to, for example Figure 1 and Figure 4 The resistance temperature apparatus 170 is shown. For the same components as those in the resistance temperature apparatus 170, the same reference notation in the range of 300 is used instead of the range of 100 (e.g., 372 is used instead of 172 for the second wire). The differences are explained below. Specifically, the resistance temperature apparatus 370 has only two wires 372 and 373, and therefore can only be used for measurements in two-wire mode.

[0122] In this configuration, the other current applicator 131 applies the excitation current via the analog input connector 123. The voltage Um between the analog input connector 123 and the reference connector 122 is measured by the pass-through detection circuit 140. Assuming the ohmic resistances R372 and R373 of the wires 372 and 373 are known and remain constant, the voltage UTD can be calculated from Um as UTD = Um - U2 - U3. Naturally, the excitation current should remain constant, and the electronic drive controller 101 is designed accordingly.

[0123] The sensor interface circuitry 130 (particularly the pass-through detection circuitry 140 and the compensation detection circuitry 150) is configured to prevent excitation current from the other current applicator 131 from flowing through the pass-through detection circuitry 140 and the compensation detection circuitry 150. The excitation current flows only from the other current applicator 131 through the analog input connector 123, the lead wire 373, the temperature sensing resistor 375, the lead wire 372, and the reference connector 122 to the potential reference GND.

[0124] Any one, several, or all of the following components may be fixed to the main circuit board of the electronic drive controller 101: microcontroller 103, communication interface 104, power input terminal 105, drive circuit 106, motor current output terminal 107, and memory 108.

[0125] In an exemplary embodiment, the sensor interface circuit 130 and connector terminal 125 are formed on a separate auxiliary circuit board provided to the main circuit board. An internal connector 139 of the sensor interface circuit 130 connects the auxiliary circuit board to the main circuit board, and thus connects the sensor interface circuit 130 to the microcontroller 103. However, the sensor interface circuit 130 and connector terminal 125 are also integrated into the housing 102 of the electronic drive controller 101.

[0126] Alternatively, the sensor interface circuit 130 can be directly formed on the main circuit board.

[0127] exist Figure 2 Another embodiment of the electric motor assembly 200 is shown in the figure. Figure 2 The electric motor assembly 200 and its operation are similar to those of the electric motor assembly 100.

[0128] Another embodiment of the electric motor assembly 200 includes an electronic drive controller 201. The electronic drive controller 201 and its operation are similar to those of the electronic drive controller 101. For the same components as in the electronic drive controller 101, the same reference numerals within the range of 200 (not 100) are used (e.g., 221 is used for analog output connectors instead of 121). The differences will be explained further below.

[0129] Another embodiment of the electric motor assembly 200 includes a temperature distance device 270. The resistance temperature device 270 and its operation are similar to... Figure 1 and Figure 4 The resistance temperature device 170 is shown. For the same components as in the resistance temperature device 170, the same reference numerals in the range of 200 are used instead of the range of 100 (e.g., 271 is used instead of 171 for the first wire). The differences will be explained below.

[0130] The resistance temperature device 270 includes another wire 274 (in this case, a fourth wire 274) connected in parallel with the second wire 272 to the second side of the temperature sensing resistor 275. The electronic control unit 201 includes an additional connector 224 (a fourth connector 224) for connecting this other wire 274. Figure 2 As shown, the other connector 224 can also be formed in the connector terminal 225.

[0131] The sensor interface circuit 230 is configured for temperature measurement with wire resistance compensation, i.e., by using an additional wire 274 connected to another connector 224 as a reference wire.

[0132] Figure 2 The sensor interface circuit 230 includes a reference detection circuit 256 that uses the voltage UGD between the other connector 224 and the reference connector 222. For example... Figure 2 As shown, the reference detection circuit 256 can have a similar structure to the compensation detection circuit 250. It includes a differential amplifier 257, a low-pass filter 258, and an analog-to-digital converter 259 connected in series. This analog-to-digital converter 259 is also referred to as the reference ADC 259. The first input terminal 257a of the differential amplifier 257 is connected to the other connector 224, and the second input terminal 257b of the differential amplifier 257 is connected to the reference connector 222 (or otherwise connected to the potential reference GND). Differential amplifier feedback and ohm resistors corresponding to the connector link ohm resistor 254 and feedback ohm resistor 255 in the compensation detection circuit 250 may exist, but are not explicitly shown. The output terminal 257c of the differential amplifier 257 is connected to the input terminal of the low-pass filter 258. The output terminal of the low-pass filter 258 is connected to the input terminal of the reference ADC 259. The output terminal of the reference ADC 259 provides a signal and is connected to the microcontroller 203.

[0133] The reference detection circuit 256 is configured to prevent excitation current from flowing through the other connector 224, and thus prevent it from flowing through other wires 274. For example, the differential amplifier 257 has high impedance.

[0134] No current flows through wires 273 and 274, and therefore U2 = U4 = 0. Thus, UTD can be calculated simply and accurately, for example, by UTD = Um - UGD.

[0135] The microcontroller 203 can be configured to calculate the UTD of the temperature sensing resistor U and the (thermally related) ohmic resistance RTD (not shown).

[0136] If the ohmic resistors R271 and R272 are different, embodiments including both the compensation detection circuit 250 and the reference detection circuit 256 are particularly useful. Therefore, the reference detection circuit 256 is used in the four-wire configuration.

[0137] Naturally, temperature measurements without wire resistance compensation are generally inferior to... Figure 1 , Figure 2 and Figure 4 The temperature measurement shown is accurate with wire resistance compensation. However, the possibility of using this method also increases the versatility of the electronic drive controllers 101 and 201. If higher accuracy of temperature measurement is required, the corresponding measurement mode of the resistance temperature devices 170 and 270 with at least three wires 171, 172, 173, 271, 272, 273, and 274, and the electronic drive controllers 101 and 201 with wire resistance compensation, can be used. If lower accuracy is required, a method such as... Figure 3 The diagram shows the corresponding measurement modes of the resistance temperature device 370 with only two wires 372 and 373, and the electronic drive controllers 101 and 201 without wire resistance compensation. The analog output connectors 121 and 221 can then be used for other purposes. Furthermore, when... Figure 1 or Figure 4 When the first wires 171 and 271 in the circuit are disconnected or damaged, the electronic drive controllers 101 and 201 can automatically switch to the appropriate mode. Figure 3 Explanation of the measurement pattern.

[0138] Naturally, the temperature sensing resistors 175, 275, and 375 can be placed in any other desired location, for example... Figure 4 The position shown can also be placed about Figure 2 and Figure 3 The location shown. Reference symbol list: 101; 201 Electronic Drive Controller 102; 202 casing 103; 203 microcontroller 104; 204 communication interfaces 105; 205 power input terminals 106; 206 drive circuit 107; 207 Motor current output terminal 108; 208 memory 121; 221 Analog Output Connector 122; 222 reference connector 123; 223 Analog Input Connector 224 Other Connectors 125; 225 connectors 130; 230 sensor interface circuit 131; 231 Current Applicator 132; 232 Analog Output Current Applicator 139; 239 Internal Connector 140; 240 through detection circuit 141; 241 buffer 142; 242 low-pass filter 143; 243 Analog-to-Digital Converter (Through-Detection ADC) 150; 250 Compensation Detection Circuit 151; 251 differential amplifier 151a, 151b; 251a, 251b input terminals 151c; 251c output terminals 152; 252 low-pass filter 153; 253 Analog-to-Digital Converter (ADC) 154; 254 connector link ohm resistor 155; 255 feedback ohm resistor 161; 261 Inverter Stage 170; 270; 370 resistance temperature devices 171; 271 First conductor 172; 272; 372 Second conductor 173; 273; 373 Third conductor 274 Other conductors 175; 275; 375 temperature sensing resistors 80 power supply 90 electric motor 100; 200; 300; 400 electric motor assembly 256 reference detection circuit 257 Differential Amplifier 257a, 257b input terminals 257c output terminal 258 low-pass filter 259 Analog-to-Digital Converter (Reference ADC) Room 495 GND potential reference Voltage drops on U1, U2, U3, and U4 (the conductors) U13 voltage difference Um, UGD voltage UTD (voltage drop across the temperature sensing resistor) R171, R172, R173 ohm resistors R271, R272, R273, R274 ohm resistors R372, R373 ohm resistors

Claims

1. An electronic drive controller (101) for driving an electric motor (90); 201), the electronic drive controller (101; 201) includes: Reference connector (122; 222) connected to the potential reference (GND); Analog input connectors (123; 223); and Analog output connectors (121; 221); The electronic drive controller (101; 201) is characterized in that it includes a sensor interface circuit (130; 230) connected to the reference connector (122; 222), the analog input connector (123; 223), and the analog output connector (121; 221), wherein the sensor interface circuit (130; 230) is configured to operate a resistance temperature detector (170; 270) having at least three wires (171, 172, 173; 271, 272, 273, 274) to apply an excitation current via the analog output connector (121; 221) for temperature measurement with wire resistance compensation.

2. The electronic drive controller (101; 201) according to claim 1, characterized in that, The sensor interface circuit (130; 230) includes a compensation detection circuit (150; 250) for detecting the voltage drop (UTD) on the temperature sensing resistor (175; 275) of the resistance temperature detector (170; 270) using the voltage difference (U13) between the analog output connector (121; 221) and the analog input connector (123; 223).

3. The electronic drive controller (101; 201) according to claim 2, characterized in that, The compensation detection circuit (150; 250) includes: A differential amplifier (151; 251) having a first input terminal (151a; 251a), a second input terminal (151b; 251b), and an amplifier output terminal (151c; 251c), wherein the first input terminal (151a; 251a) is connected to the analog output connector (121; 221), and the second input terminal (151b; 251b) is connected to the analog input connector (123; 223); and An analog-to-digital converter (153; 253) is coupled to the output of the amplifier (151c; 251c) and connected to the potential reference (GND).

4. The electronic drive controller (101; 201) according to claim 3, characterized in that, The analog-to-digital converter (153; 253) of the compensation detection circuit (150; 250) is coupled to the amplifier output (151c; 251c) via a low-pass filter (152; 252).

5. The electronic drive controller (101; 201) according to claim 3 or 4, characterized in that, The electronic drive controller (101; 201) includes a microcontroller (103), wherein the microcontroller (103) is connected to the analog-to-digital converter (153; 253) of the compensation detection circuit (150; 250), or the microcontroller (103) includes the analog-to-digital converter (153; 253) of the compensation detection circuit (150; 250).

6. The electronic drive controller (101; 201) according to claim 1, characterized in that, The sensor interface circuit (130; 230) includes a temperature resistor detection circuit (140; 240) for detecting the voltage (Um) between the analog input connector (123; 223) and the reference connector (122; 223).

7. The electronic drive controller (101; 201) according to claim 6, characterized in that, The temperature resistor detection circuit (140; 240) includes an analog-to-digital converter (143; 243), wherein the analog-to-digital converter (143; 243) is coupled to the analog input connector (123; 223) and connected to the reference connector (122; 212).

8. The electronic drive controller (101; 201) according to claim 7, characterized in that, The analog-to-digital converter (143; 243) of the temperature resistor detection circuit (140; 240) is coupled to the analog input connector (123; 223) via a buffer (141; 241) and / or a low-pass filter (142; 242).

9. The electronic drive controller (101; 201) according to claim 1, characterized in that, The electronic drive controller (101; 201) includes an analog output current applicator (132; 232) connected to the analog output connector (121; 221).

10. The electronic drive controller (101; 201) according to claim 1, characterized in that, The electronic drive controller (101; 201) includes a current applicator (131; 231) connected to the analog input connector (123; 223).

11. The electronic drive controller (101; 201) according to claim 1, characterized in that, The electronic drive controller (101; 201) includes a drive circuit (106; 206) for supplying power to the electric motor (90), wherein the drive circuit (106; 206) includes an inverter stage (161; 161).

12. The electronic drive controller (101; 201) according to claim 1, characterized in that, The reference connector (122; 222), the analog input connector (123; 223), and the analog output connector (121; 221) are formed in a single connector terminal (125; 225).

13. An electronic drive controller assembly, characterized in that... include: A resistance temperature detector (170; 270) having at least three wires (171, 172, 173; 271, 272, 273, 274); and An electronic drive controller (101; 201) according to any one of claims 1 to 12 for operating an electric motor (90). The first wire (171; 271) of the wires (171, 172, 173; 271, 272, 273, 274) is connected to the analog output connector (121; 221), the second wire (172; 271) of the wires (171, 172, 173; 271, 272, 273, 274) is connected to the reference connector (122; 221), and the other wires (173; 273, 274) of the wires (171, 172, 173; 271, 272, 273, 274) are connected to the analog input connector (123; 223) or to other connectors (224) of the resistance temperature detector (170; 270).

14. An electric motor assembly (100; 200; 400), characterized in that... include: Electric motor (90); A resistance temperature detector (170; 270) having at least three wires (171, 172, 173; 271, 272, 273, 274); and An electronic drive controller (101; 201) according to any one of claims 1 to 12 for operating the electric motor (90).

15. The electric motor assembly (100; 200; 400) according to claim 14, characterized in that, The first wire (171; 271) of the wires (171, 172, 173; 271, 272, 273, 274) is connected to the analog output connector (121; 221), the second wire (172; 272) of the wires (171, 172, 173; 271, 272, 273, 274) is connected to the reference connector (122; 222), and the other wires (173; 273, 274) of the wires (171, 172, 173; 271, 272, 273, 274) are connected to the analog input connector (123; 223) or to another connector (224) of the resistance temperature detector (170; 270).

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