Positioning device for generating a rotational position signal and excitation device for generating an excitation signal for a resolver
阅读说明:本技术 用于产生旋转位置信号的定位装置以及用于产生用于旋转变压器的激励信号的激励装置 (Positioning device for generating a rotational position signal and excitation device for generating an excitation signal for a resolver ) 是由 里斯托·泰恩 马蒂·伊斯卡纽斯 于 2020-02-20 设计创作,主要内容包括:本发明提出了一种用于产生指示旋转变压器的旋转位置的位置信号的定位装置(101)。该定位装置包括:信号接口(102),其用于从旋转变压器接收交变信号(V_cos、V_sin);以及处理系统(103),其用于基于交变信号的位置相关的振幅和指示旋转变压器的激励信号(V_exc)的极性的极性信息来生成位置信号。处理系统被配置为识别交变信号中的一个或两个交变信号的波形上的极性指示符(诸如频率或相位变化),并基于识别出的极性指示符来确定极性信息。这样,与激励信号有关的极性信息被包括在交变信号中,并且因此不需要用于将极性信息传送到定位装置的单独的信令信道。(The invention proposes a positioning device (101) for generating a position signal indicative of a rotational position of a resolver. The positioning device includes: a signal interface (102) for receiving an alternating signal (V _ cos, V _ sin) from a resolver; and a processing system (103) for generating a position signal based on the position-dependent amplitude of the alternating signal and polarity information indicative of the polarity of the excitation signal (V _ exc) of the resolver. The processing system is configured to identify a polarity indicator (such as a frequency or phase change) on a waveform of one or both of the alternating signals, and determine polarity information based on the identified polarity indicator. In this way, the polarity information relating to the excitation signal is included in the alternating signal and therefore no separate signalling channel for communicating the polarity information to the positioning device is required.)
1. A positioning device (101) for generating a position signal indicative of a rotational position of a resolver, the positioning device comprising:
-a signal interface (102) for receiving a first alternating signal (V _ cos) and a second alternating signal (V _ sin), the amplitudes of the first and second alternating signals being dependent on the rotational position of the resolver such that the envelopes of the first and second alternating signals have a mutual phase shift, and
a processing system (103) for generating the position signal based on amplitudes of the first and second alternating signals and polarity information indicative of a polarity of an excitation signal of the resolver,
wherein the processing system is configured to:
-identifying a polarity indicator on a waveform of at least the first alternating signal, and
-determining the polarity information based on the identified polarity indicator.
2. The positioning device of claim 1, wherein the processing system is configured to identify a phase change or a frequency change of the first alternating signal and to determine the polarity information based on the identified phase change or the identified frequency change.
3. The positioning device of claim 2, wherein the processing system is configured to constitute a zero-crossing detector for identifying zero crossings of the waveform of the first alternating signal to identify the phase change or the frequency change.
4. The positioning device of claim 1, wherein the processing system is configured to compare the waveform of the first alternating signal with a predetermined waveform pattern and, in response to a match between the waveform of the first alternating signal and the predetermined waveform pattern, determine the polarity information based on a portion of the first alternating signal that matches the predetermined waveform pattern.
5. The positioning device of any one of claims 1 to 4, wherein the processing system is configured to identify the polarity indicator on both the waveform of the first alternating signal and the waveform of the second alternating signal.
6. Excitation device (104) for generating an excitation signal (V _ exc) for a resolver, the excitation device comprising:
a signal generator (105) for generating the excitation signal, an
A signal interface (106) for transmitting the excitation signal to the rotary transformer,
characterized in that the excitation means further comprise a modulator (107) for modulating the waveform of the excitation signal to include a polarity indicator,
the polarity indicator represents the polarity of the excitation signal when the polarity indicator is detected on a signal that is the excitation signal multiplied by a gain having an unknown sign.
7. The excitation device of claim 6, wherein the modulator is configured to modulate the waveform of the excitation signal to include a phase change or a frequency change representative of the polarity indicator such that the excitation signal has a predetermined polarity when the phase change or the frequency change occurs.
8. The excitation device of claim 6, wherein the modulator is configured to modulate the amplitude of the excitation signal such that the waveform of the excitation signal includes a predetermined waveform pattern representative of the polarity indicator.
9. A converter (108, 109) for controlling a voltage of a winding system of an electric machine, the converter comprising:
-excitation device (104, 154) according to any of claims 6 to 8 for generating an excitation signal for a resolver connected to a rotor of the electrical machine, an
-a processing system (103, 153) for generating a position signal indicative of a rotational position of the resolver based on polarity information indicative of a polarity of the excitation signal and an amplitude of an alternating signal produced by the resolver.
10. A converter (108, 109) for controlling a voltage of a winding system of an electric machine, the converter comprising a positioning device (101, 151) according to any of claims 1 to 5 for generating a position signal indicative of a rotational position of a resolver connected to a rotor of the electric machine.
11. The converter (108, 109) of claim 10, further comprising an excitation device (104, 154) according to any one of claims 6 to 8 for generating an excitation signal for the resolver.
12. The converter of any one of claims 9 to 11, wherein the converter is a frequency converter.
13. A method, comprising:
-receiving (301) a first and a second alternating signal from a resolver, the amplitudes of the first and second alternating signals being dependent on the rotational position of the resolver such that the envelopes of the first and second alternating signals have a mutual phase shift; and
-generating (304) a position signal indicative of a rotational position of the resolver based on amplitudes of the first and second alternating signals and polarity information indicative of a polarity of an excitation signal of the resolver,
characterized in that the method comprises:
-identifying (302) a polarity indicator on a waveform of at least the first alternating signal, and
-determining (303) the polarity information based on the identified polarity indicator.
Technical Field
The invention relates to a positioning device for generating a position signal indicative of a rotational position of a resolver (resolver). The invention further relates to an excitation device for generating an excitation signal for a resolver.
Background
An electric drive system typically comprises an electric machine for driving an actuator and an inverter for controlling the electric machine. The actuator may be, for example, a wheel or a track of a mobile machine or a tool of a stationary machine. The converter may be, for example, a frequency converter. In many cases, the electric drive system includes a resolver for detecting a rotational position of a rotor of the electric machine, and the inverter is configured to control operation of the electric machine based at least in part on the detected rotational position of the rotor. The rotary transformer may be, for example, a variable reluctance "VR" rotary transformer that receives the alternating excitation signal and generates a first alternating signal and a second alternating signal, the amplitudes of the first alternating signal and the second alternating signal being dependent on the rotational position of the rotary transformer such that the envelopes of the first alternating signal and the second alternating signal have a mutual phase shift. An advantage of a variable reluctance resolver is that no windings are required in the rotor of the resolver. However, the rotary transformer may also be a wound rotor rotary transformer that includes brushes or rotary transformers for transmitting excitation signals to the rotor windings of the rotary transformer. The transducer is configured to transmit an excitation signal to the resolver and receive the first and second alternating signals from the resolver and generate a position signal indicative of a rotational position based on amplitudes of the first and second alternating signals and a polarity of the excitation signal of the resolver.
In many electric drive systems, the electric machine is a multi-winding machine comprising two or more winding systems, each of which is supplied with a separate inverter. An electric machine may comprise, for example, two three-phase stator windings such that there is an angle of 30 electrical degrees between the respective magnetic axes of the two three-phase stator windings. In an electric drive system of the kind described above, each of these inverters requires information indicative of the rotational position of the rotor of the electric machine. Typically, a converter, such as for example a frequency converter, comprises a signal transfer interface for transmitting an excitation signal to the rotary transformer and for receiving an alternating signal from the rotary transformer, the amplitude of the alternating signal depending on the rotational position of the rotary transformer such that the envelopes of the alternating signals have a mutual phase shift. One simple approach is to use as many resolvers as there are inverters, but it would be more cost effective to use a single resolver for all inverters. Furthermore, from the point of view of product portfolio management, it is advantageous that mutually similar converters can be used for different winding systems of the electric machine.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of various inventive embodiments. This summary is not an extensive overview of the invention. It is intended to neither identify key or critical elements of the invention nor delineate the scope of the invention. The following summary merely presents some concepts of the invention in a simplified form as a prelude to the more detailed description of the exemplary embodiments.
According to the present invention, a new positioning device for generating a position signal indicative of the rotational position of a resolver is provided. The positioning device according to the present invention comprises:
-a signal interface for receiving a first alternating signal and a second alternating signal, the amplitudes of the first alternating signal and the second alternating signal being dependent on the rotational position of the resolver such that the envelopes of the first alternating signal and the second alternating signal have a mutual phase shift, and
-a processing system for generating the position signal based on the amplitudes of the first and second alternating signals and based on polarity information indicative of the polarity of an excitation signal of the resolver.
The processing system of the positioning apparatus is configured to:
-identifying a polarity indicator on the waveform of the first alternating signal and/or the waveform of the second alternating signal, such as for example a frequency change or a phase change, and
-determining the polarity information based on the identified polarity indicator.
Since the polarity information representing the polarity of the excitation signal is included in the first alternating signal and the second alternating signal, no separate signaling channel for communicating the polarity information to the positioning device is required.
According to the present invention, there is also provided a new excitation device for generating an excitation signal for a resolver. The excitation device according to the invention comprises:
a signal generator for generating the excitation signal,
-a signal interface for transmitting the excitation signal to the rotary transformer, an
-a modulator for modulating the waveform of the excitation signal to include a polarity indicator, the polarity indicator representing the polarity of the excitation signal when the polarity indicator is detected on a signal that is the excitation signal multiplied by a gain having an unknown sign.
According to the invention, a new converter for controlling the voltage of a winding system of an electric machine is also provided. The converter may be, for example, a frequency converter. The transducer according to the invention comprises a positioning device according to the invention and/or an excitation device according to the invention.
According to the present invention, there is also provided a new converter system comprising two or more converters according to the present invention for controlling the voltage of two or more winding systems of one or more electric machines.
In a transducer system according to an exemplary and non-limiting embodiment, each transducer comprises a positioning device according to the present invention and an excitation device according to the present invention. In this exemplary case, one of the converters is configured to transmit an excitation signal to a resolver connected to the electric machine, and all converters are configured to receive an alternating signal from the resolver, the amplitude of which alternating signal depends on the rotational position of the resolver, such that the envelopes of the alternating signals have a mutual phase shift. Therefore, only one resolver is required. Further, the converters may be similar to each other.
According to the present invention, there is also provided a new electric drive system comprising:
one or more electric machines comprising two or more winding systems,
-a resolver for detecting a rotational position of the one or more electric machines, an
-an inverter system according to the invention for controlling said one or more electric machines.
The electric drive system may comprise, for example, an electric machine having at least two winding systems such that the directions of the respective magnetic axes of the winding systems differ from each other. An electric machine may comprise, for example, two three-phase stator windings such that there is an angle of 30 electrical degrees between the respective magnetic axes of the two three-phase stator windings. However, it is also possible that there are two or more electric machines, such that the shafts of the electric machines are directly mechanically interconnected or mechanically interconnected with gears, such that the rotational positions of the shafts are constrained to each other.
According to the present invention, a new method for generating a position signal indicative of the rotational position of a resolver is also provided. The method according to the invention comprises the following steps:
-receiving a first and a second alternating signal from a resolver, the amplitudes of the first and second alternating signals being dependent on the rotational position of the resolver such that the envelopes of the first and second alternating signals have a mutual phase shift; and
-identifying a polarity indicator on the waveform of the first alternating signal and/or the waveform of the second alternating signal, and
-determining polarity information indicative of a polarity of an excitation signal of the resolver based on the identified polarity indicator, and
-generating the position signal based on the amplitudes of the first and second alternating signals and the polarity information.
Various exemplary and non-limiting embodiments are described in the accompanying dependent claims.
The exemplary and non-limiting embodiments, both as to organization and method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific exemplary and non-limiting embodiments when read in connection with the accompanying drawings.
The verbs "comprise" and "comprise" are used herein as open-ended limitations that neither exclude nor require the presence of unrecited features. The features recited in the dependent claims may be freely combined with each other, unless explicitly stated otherwise. In addition, it should be understood that the use of "a" or "an" (i.e., singular forms) throughout does not exclude a plurality.
Drawings
Exemplary and non-limiting embodiments and advantages thereof are described in detail herein, by way of example, and with reference to the accompanying drawings, wherein:
figure 1 shows a schematic view of an electric drive system including a positioning device according to an exemplary and non-limiting embodiment and an excitation device according to an exemplary and non-limiting embodiment,
fig. 2a, 2b and 2c show exemplary waveforms of an excitation signal generated by an excitation device according to an exemplary and non-limiting embodiment and corresponding exemplary waveforms of an alternating signal produced by a resolver, an
FIG. 3 shows a flowchart of a method for generating a position signal indicative of a rotational position of a resolver, according to an exemplary and non-limiting embodiment.
Detailed Description
The specific examples provided in the following description should not be construed as limiting the scope and/or applicability of the appended claims. The lists and groups of examples provided in the specification are not exhaustive unless explicitly stated otherwise.
FIG. 1 illustrates a schematic diagram of an
The
where t is time, V is the amplitude of the excitation signal V _ exc, TR is the maximum transformation ratio between the excitation winding of the
The
The
The
Positioning device for transducer 108151 includes: a
The
The
In the exemplary transducer system shown in fig. 1, the
The
Fig. 2a shows an exemplary waveform of an excitation signal V _ exc generated by the excitation device according to an exemplary and non-limiting embodiment. Furthermore, fig. 2a shows corresponding exemplary waveforms of the first and second alternating signals V _ cos and V _ sin generated by the
In the positioning apparatus according to an exemplary and non-limiting embodiment, the
Fig. 2b shows an exemplary waveform of an excitation signal V _ exc generated by the excitation device according to an exemplary and non-limiting embodiment. Furthermore, fig. 2b shows corresponding exemplary waveforms of the first and second alternating signals V _ cos and V _ sin generated by the
In the positioning apparatus according to an exemplary and non-limiting embodiment, the
In the positioning device according to an exemplary and non-limiting embodiment, the
Fig. 2c shows an exemplary waveform of an excitation signal V _ exc generated by the excitation device according to an exemplary and non-limiting embodiment. Furthermore, fig. 2c shows corresponding exemplary waveforms of the first and second alternating signals V _ cos and V _ sin generated by the
In the positioning apparatus according to an exemplary and non-limiting embodiment, the
In the excitation device according to an exemplary and non-limiting embodiment, the
FIG. 3 shows a flowchart of a method for generating a position signal indicative of a rotational position of a resolver, according to an exemplary and non-limiting embodiment. The method comprises the acts of:
-action 301: receiving a first alternating signal and a second alternating signal from the resolver, the amplitudes of the first alternating signal and the second alternating signal being dependent on the rotational position of the resolver, such that the envelopes of the first alternating signal and the second alternating signal have a mutual phase shift,
-an action 302: identifying a polarity indicator on the waveform of the first alternating signal and/or the waveform of the second alternating signal,
-action 303: determining polarity information indicative of a polarity of an excitation signal of the resolver based on the identified polarity indicator, an
-an action 304: based on the amplitude and polarity information of the first and second alternating signals, a position signal is generated that is indicative of the rotational position of the resolver.
In a method according to an exemplary and non-limiting embodiment, identifying the polarity indicator comprises identifying a phase change or a frequency change of the first alternating signal and/or a phase change or a frequency change of the second alternating signal. In the method according to the exemplary and non-limiting embodiment, the polarity information is determined based on the identified phase change or the identified frequency change.
In a method according to an exemplary and non-limiting embodiment, identifying the polarity indicator comprises comparing the waveform of the first alternating signal and/or the waveform of the second alternating signal with a predetermined waveform pattern. In the method according to this exemplary and non-limiting embodiment, the polarity information is determined based on a portion of the first alternating signal and/or a portion of the second alternating signal matching the predetermined waveform pattern.
The specific examples provided in the description given above should not be construed as limiting the scope and/or applicability of the appended claims. The lists and groups of examples provided in the description given above are not exhaustive unless explicitly stated otherwise.
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