JP7072194B1 - Multi-rotation detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation detection signal processing unit which can be miniaturized without separately providing an exciting means. SOLUTION: The rotation detection signal processing unit 10 is used together with a resolver 30 to detect a rotation angle, and the rotation detection signal processing unit 10 integrally includes an excitation amplifier 11 for outputting an excitation signal to be supplied to the resolver 30. It is formed as an ASIC to be provided. [Selection diagram] Fig. 1

Description

The present invention relates to a multi-rotation detection device, and is particularly new in that a rotation detection signal processing unit including an ASIC is provided with an excitation signal amplification means for amplifying an excitation signal supplied to a resolver and a backup excitation signal generation means. Regarding improvements.

The "absolute position detection method and apparatus" disclosed in Patent Document 1 inputs an AC excitation signal from a resolver / digital conversion means to one resolver via a switching means when energized, obtains a resolver output signal, and at the same time, obtains a resolver output signal. In the event of a power failure, the pulse excitation signal from the pulse exciting means is input to the resolver via the switching means, and the resolver output signal and the pulse excitation signal are input to the rotation speed counting means to obtain multi-rotation count data at the time of power failure. It is a configuration that has been made.

Japanese Patent No. 4709963

However, since the rotation detection signal processing unit, the excitation signal amplification means, and the switching means are separately formed, there is a disadvantage that the circuit scale is large and the signal of the switching means becomes complicated. Therefore, there is a limit to miniaturization.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to reduce the size of a multi-rotation detection device by incorporating it in a rotation detection signal processing unit without separately providing an exciting means. There is.

The rotation detection device according to the present invention is a multi-rotation detection device having a rotation detection signal processing unit that processes a rotation detection signal from a resolver, and the rotation detection signal processing unit amplifies an excitation signal supplied to the resolver. The rotation detection signal is formed as an ASIC that integrally includes an excitation amplifier, a backup excitation signal generation means, and a switching means connected to the excitation amplifier and the backup excitation signal generation means. The processing unit has a normal power supply mode that operates by power continuously supplied from the outside and a backup power supply connected to the rotation detection signal processing unit when the power continuously supplied from the outside is not supplied. It has two operation modes, a backup power supply mode operated by the above, and in the backup power supply mode, rotation detection is performed with less power than the normal power supply mode, and in the backup power supply mode, an excitation signal output to the resolver is performed. The voltage value of is lower than the voltage value of the excitation signal in the normal power supply mode, the excitation signal is generated as an intermittent pulse signal in the backup power supply mode, and the switching means is the input excitation. It is a circuit that selects a signal and outputs it to the resolver, and also has a configuration that selects an excitation signal generated according to the operation mode of the rotation detection signal processing unit and outputs it to the resolver.

According to the present invention, the circuit scale can be reduced. Therefore, the size can be reduced, the number of parts can be reduced, and the cost can be reduced.

It is a circuit diagram which shows the rotation detection signal processing part which concerns on embodiment of this invention. It is a figure which shows the change of the excitation waveform at the time of changing from the normal power supply mode to the backup power supply mode in the rotation detection signal processing unit of FIG. It is a figure which shows the change of the excitation waveform at the time of changing from a backup power source mode to a normal power source mode in the rotation detection signal processing unit of FIG.

The rotation detection signal processing unit 10 according to the embodiment of the present invention will be described with reference to FIG. The rotation detection signal processing unit 10 constitutes a multi-rotation detection device 100 together with the RD converter 20 and the resolver 30.

The rotation detection signal processing unit 10 is a main circuit responsible for operation control, calculation and output of acquired rotation angle information, and the like in rotation detection. The rotation detection signal processing unit 10 includes an excitation amplifier 11, a switching means 12, a rotation number detection means 13, a rotation number counting means 14, a backup excitation signal generation means 15, a calculation means 17, and an interface 18. The rotation detection signal processing unit 10 is formed of a one-chip IC as an ASIC including these. Each configuration will be described below.

The excitation amplifier 11 is a circuit that amplifies the excitation signal. The excitation signal generated by the RD converter 20 is input to the excitation amplifier 11. The excitation amplifier 11 amplifies the input excitation signal and outputs it to the switching means 12. The excitation amplifier 11 is, for example, an excitation amplifier that amplifies an input excitation signal.

The switching means 12 is a circuit that selects the input excitation signal and outputs it to the resolver 30. The excitation amplifier 11 and the backup excitation signal generation means 15 are connected to the switching means 12, and as will be described later, an excitation signal generated according to the operation mode of the rotation detection signal processing unit 10 is selected. , Output to resolver 30.

The rotation speed detecting means 13 is a circuit that converts an AC wave signal output from the resolver 30 into a square wave signal and outputs the signal. The rotation speed information of one rotation unit is output to the rotation speed counting means 14.

The rotation speed counting means 14 is a circuit that holds the rotation speed information input from the rotation speed detecting means 13. The rotation speed counting means 14 holds rotation speed information in units of one rotation. The rotation speed counting means 14 outputs the held rotation speed information to the connected arithmetic means 17.

The backup excitation signal generation means 15 is a circuit that generates an excitation signal to be output to the resolver 30 according to the operation mode of the rotation detection signal processing unit 10. The rotation detection signal processing unit 10 has a normal power supply mode that operates with electric power from the outside and a backup power supply mode that detects rotation while the main power supply is off. Normally, the rotation detection signal processing unit 10 is operated by the electric power continuously supplied from the outside, and the electric power from the outside is not supplied while the main power supply is off. However, it is desirable that rotation detection can be performed even when the main power supply of the rotation detection signal processing unit 10 is turned off. Therefore, a backup operation clock 16 as a backup power source is connected to the rotation detection signal processing unit 10, specifically, the backup excitation signal generation means 15, and the backup excitation signal generation means 15 generates the excitation signal. It is configured so that it can be output. The backup excitation signal generation means 15 is connected to the switching means 12, and the excitation signal can be output to the resolver 30 via the switching means 12 even while the main power supply is off.

The calculation means 17 is a circuit that calculates absolute rotation angle information by adding the rotation angle signal from the rotation number counting means 14 and the rotation angle signal from the RD converter 20. Rotation angle information in units of one rotation is input from the rotation number counting means 14, and rotation angle information of less than 360 ° is input from the RD converter 20. The calculation means 17 calculates the absolute rotation angle by adding those signals.

The interface 18 is a device for outputting the absolute rotation angle information calculated by the calculation means 17 to the outside. The interface 18 outputs absolute rotation angle information to each connected external device via a serial parallel interface or the like.

The external power supply is connected to the rotation detection signal processing unit 10 via a reset IC circuit including the voltage detection means 41 and the control means 42, and a DC current having a constant voltage value is input.

The RD converter (resolver digital converter) 20 is a circuit that converts an AC wave signal output from the resolver 30 into a digital signal. The RD converter 20 is formed as a one-chip IC. The digital signal converted by the RD converter 20 is output to the rotation detection signal processing unit 10 connected to the RD converter 20. Further, in the present embodiment, the RD converter 20 includes a circuit that generates an AC wave signal as an excitation signal output to the resolver 30 via the rotation detection signal processing unit 10 in the normal power supply mode. The AC wave signal generated by the RD converter 20 is amplified by the excitation amplifier 11 included in the rotation detection signal processing unit 10 and then output to the resolver 30 as an excitation signal.

The resolver 30 is a device that outputs a voltage according to the rotation angle. As is well known, the resolver 30 includes a rotor and a stator (not shown). A plurality of teeth around which a coil is wound are formed on the inner peripheral surface of the annular stator in the circumferential direction. The plurality of coils include an excitation coil to which an excitation signal is input and an output coil in which an output voltage is generated according to the fluctuation of the gap between the rotor and the tip of the tooth. As will be described later, a rotation detection signal processing unit 10 is connected to the exciting coil, and an RD converter 20 and a rotation detection signal processing unit 10 are connected to the output coil, respectively.

With reference to FIGS. 2 to 3, next, the normal power supply mode that operates with the power continuously supplied from the outside, which is a feature of the rotation detection signal processing unit 10 of the present invention, and when the external power is not supplied. , The backup power mode operated by the backup power supply will be described. The circuit that generates the excitation signal and the waveform of the generated excitation signal are different between the normal power supply mode and the backup power supply mode.

<Normal power mode>
First, the normal power mode will be described. The normal power supply mode is an operation mode in which the rotation detection signal processing unit 10 is operated by electric power continuously supplied from the outside. In normal power mode, the excitation signal is generated by the RD transducer 20. The AC wave signal generated by the RD converter 20 is input to the excitation amplifier 11 of the rotation detection signal processing unit 10. 2 to 3 show the main power supply state of the rotation detection signal processing unit 10 and the form of the excitation signal output to the resolver. In the normal power supply mode, the RD converter 20 generates an AC wave signal A, which is an excitation signal, and outputs the AC wave signal A to the excitation amplifier 11. The excitation amplifier 11 amplifies the input excitation signal and outputs it to the switching means 12. The switching means 12 selects an excitation signal from the excitation amplifier 11 and outputs it to the resolver 30. When an excitation signal is input to the resolver 30, an AC wave output corresponding to the rotation of the resolver 30 is output from the resolver 30. The output AC wave signal is input to the rotation detection signal processing unit 10 and input to the RD converter 20, and after being converted into digital signals, they are added up by the calculation means 17 to calculate the absolute rotation angle. To. The above is the operation in the normal power mode.

<Backup power mode>
Next, the backup power mode will be described. While the main power is off, external power is not supplied to the rotation detection signal processing unit 10. A backup operation clock 16 is connected to the rotation detection signal processing unit 10, and in the backup power supply mode, a battery (3.6 ∨) operates a part of the circuit provided in the rotation detection signal processing unit 10. Then, rotation detection is performed. In the backup power supply mode, the backup excitation signal generation means 15, the switching means 12, the rotation speed detection means 13, and the rotation speed counting means 14 are configured to function. In the backup power supply mode, the excitation signal is generated by the backup excitation signal generation means 15. The excitation signal generated by the backup excitation signal generation means 15 is output to the switching means 12. The switching means 12 selects the excitation signal from the backup excitation signal generation means 12 and outputs it to the resolver 30.

The operation of the resolver 30 is the same in the normal power supply mode and the backup power supply mode, and when an excitation signal is input to the resolver 30, an AC wave output corresponding to the rotation of the resolver 30 is output from the resolver 30. The output AC wave signal is input to the rotation speed counting means 14, is converted into a digital signal into rotation speed information in units of one rotation, and is then held as rotation speed information. In the backup power mode, power is not supplied to the arithmetic means 17. Therefore, in the backup power supply mode, the calculation of the absolute rotation angle by adding the rotation angle information of less than 360 ° to the rotation number information of one rotation unit obtained as described above, and the calculated absolute rotation angle information. Is not output. The calculation of adding the rotation angle of less than 360 ° to the rotation speed information of one rotation unit is performed when the normal power supply mode is restored, as will be described later. The above is the operation in the backup power supply mode.

2 to 3 show a pulse signal B, which is an excitation signal generated in the backup power supply mode. The voltage value of the excitation signal generated by the backup excitation signal generation means 15 is a voltage value lower than the excitation signal voltage of the AC wave output by the excitation amplifier 11 in the normal power supply mode, and the amplification by the excitation amplifier 11 is performed. I won't get it. Further, while the excitation signal generated in the normal power supply mode is a continuous AC wave, the excitation signal in the backup power supply mode is intermittently generated. The intermittent excitation signal is, for example, the pulse signal B shown in FIGS. 2 to 3.

FIG. 2 shows a case where the normal power supply mode is changed to the backup power supply mode, that is, the main power supply which was in the on state is turned off. The excitation signal changes so that an AC wave signal A is generated in the normal power supply mode, but a pulse signal B is generated in the backup power supply mode after the main power supply is turned off. Excitation signals are continuously generated before and after the main power is turned off, and continuous rotation detection is possible.

FIG. 3 shows a case where the backup power supply mode is changed to the normal power supply mode, that is, the main power supply which was in the off state is turned on. As the excitation signal, the pulse signal B is generated in the backup power supply mode, but the AC wave signal A is generated in the normal power supply mode. Since the excitation signal is continuously generated before and after the main power is turned on, the rotation angle can be detected even when the main power is turned off. That is, continuous rotation detection is possible regardless of whether the main power supply is on or off.

In the backup power supply mode, the rotation is detected, but the rotation angle information is not output from the rotation detection signal processing unit 10 to the outside. Further, regarding the rotation detection, only the rotation angle information in one rotation unit is detected and held by the rotation speed counting means 14. When the main power is turned on and external power is supplied to the rotation detection signal processing unit 10 and the RD converter 20, detection of a rotation angle of less than one rotation at that time is started, and the rotation number counting means. The rotation number information of one rotation unit held by 14 is added up by the calculation means 17, and is output as an absolute rotation angle.

10 Rotation detection signal processing unit, 11 Excitation amplifier, 12 Switching means, 16 Backup operation clock, 30 Resolver.

Claims (1)

A multi-rotation detection device having a rotation detection signal processing unit (10) that processes a rotation detection signal from a resolver (30).
The rotation detection signal processing unit (10) includes an excitation amplifier (11) that amplifies the excitation signal supplied to the resolver (30), a backup excitation signal generation means (15), the excitation amplifier (11), and the above. It is formed by a one-chip IC as an ASIC integrally including a switching means (12) connected to a backup excitation signal generating means (15) .
The rotation detection signal processing unit (10) has a normal power supply mode that is operated by electric power continuously supplied from the outside and a normal power supply mode.
It has two operation modes, a backup power supply mode, which is operated by a backup power supply (16) connected to the rotation detection signal processing unit (10) when there is no power supply continuously supplied from the outside. And
In the backup power supply mode, rotation detection is performed with less power than in the normal power supply mode.
In the backup power supply mode, the voltage value of the excitation signal output to the resolver (30) is a voltage value lower than the voltage value of the excitation signal in the normal power supply mode.
In the backup power mode, the excitation signal is generated as an intermittent pulse signal.
The switching means (12) is a circuit that selects an input excitation signal and outputs it to the resolver (30), and is generated according to the operation mode of the rotation detection signal processing unit (10). A multi-rotation detection device characterized in that an excitation signal is selected and output to the resolver (30).

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