JP2008216130A - Resolver excitation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce electric power and the size by the formation of a digital circuit, by providing an excitation signal via an amplifier for only switching a pulse signal provided, without having to use an analog circuit. <P>SOLUTION: This resolver excitation method is a method for providing an output signal 2 from an excitation waveform ROM 1 via a pulse conversion circuit 10, or providing the excitation signal 8 via the amplifier 5 for only switching the pulse signal 4A provided from a PWM waveform ROM 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a resolver excitation method, in particular, by supplying a pulse signal from an excitation waveform ROM or a PWM waveform ROM as an excitation signal to an excitation winding through an amplifier, thereby digitizing the circuit, The present invention relates to a novel improvement for achieving low power consumption, miniaturization, and digital circuit construction by using an amplifier as a switching-only configuration.

Conventionally, as this type of resolver excitation method used, for example, an excitation signal is supplied to the excitation winding of the resolver disclosed in Patent Document 1 by the excitation method shown in FIG.
That is, in FIG. 2, the output signal 2 from the excitation waveform ROM 1 in which the excitation waveform 1 a is stored in advance is analog-amplified through the amplifier 5 as the analog signal 4 through the D / A converter 3 and then the excitation signal 8. Is supplied to the excitation winding 7 of the resolver 6 (not shown).

Japanese Patent Laid-Open No. 10-146033

Since the conventional resolver excitation method is configured as described above, the following problems exist.
That is, since an analog signal is generated using a D / A converter, many analog circuits are used, making it difficult to digitize, making it difficult to reduce the size and price.
Further, in order to amplify an analog signal, an amplifier, class A, class B or class AB amplification is required, which increases the size of the amplifier, generates much heat, and it has been difficult to achieve low power consumption.

  The resolver excitation method according to the present invention is a resolver excitation method in which an excitation signal output via an amplification width is supplied to an excitation winding. A pulse signal applied to the amplifier is preliminarily obtained from an excitation waveform ROM having an excitation waveform. The excitation waveform is converted into a pulse train by a PWM conversion circuit, or is a method obtained by using either a pulse train from a PWM waveform ROM recorded in advance as a PWM pulse train, and the amplifier Is a method comprising a pulse amplifier with only a switching operation, and a method in which a part of the excitation winding is used as a part of a filter for the excitation signal.

Since the resolver excitation method according to the present invention is configured as described above, the following effects can be obtained.
That is, a pulse signal consisting of either a pulse train converted from an excitation waveform ROM by a PWM conversion circuit or a pulse train from a PWM waveform ROM recorded in advance by a PWM pulse train is applied to a pulse amplification amplifier. Since the excitation signal is obtained through the circuit, the entire circuit can be digitized, and downsizing, low power consumption, and low price can be achieved.

  The present invention digitizes a circuit by supplying a pulse signal from an excitation waveform ROM or a PWM waveform ROM as an excitation signal to an excitation winding via an amplifier, and the amplifier is configured only for switching. It is an object of the present invention to provide a resolver excitation method that achieves low power consumption, miniaturization, and digital circuitization.

A preferred embodiment of a resolver excitation method according to the present invention will be described below with reference to the drawings.
The same reference numerals are used for the same or equivalent parts as in the conventional example.
1 is an excitation waveform ROM in which an excitation waveform 1a is stored. An output signal 2 including the excitation waveform 1a read from the excitation waveform ROM 1 is a known PWM conversion circuit 10 ( PWM is a pulse width modulation method, which is converted by, for example, a motor driving method disclosed in Japanese Patent Application Laid-Open Nos. 2004-104954 and 2002-325460, and a pulse signal 4A of 10 KHz is generated, for example.

The pulse signal 4A is input to an amplifier 5 that achieves class D amplification as a pulse amplifier that actually performs only switching for performing pulse amplification.
The excitation signal 8 output from the amplifier 5 is supplied to the excitation winding 7 of the resolver 6 to effect excitation.

  In addition to the configuration using the pulse signal 4A using the excitation waveform ROM 1 and the PWM conversion circuit 10 described above, a PWM waveform ROM 21 in which a PWM pulse train 20 is stored in advance is used, and the pulse signal 4A output from the PWM waveform ROM 21 is used. There is also a method in which is input to the amplifier 5.

It is a block diagram which shows the resolver excitation method by this invention. It is a block diagram which shows the conventional resolver excitation method.

Explanation of symbols

1 Excitation waveform ROM
DESCRIPTION OF SYMBOLS 1a Excitation waveform 2 Output signal 4A Pulse signal 5 Amplifier 6 Resolver 7 Excitation winding 8 Excitation signal 10 PWM conversion circuit 20 PWM pulse train 21 PWM waveform ROM

Claims (3)

In the resolver excitation method for supplying the excitation signal (8) output via the amplification width (5) to the excitation winding (7),
The pulse signal (4A) applied to the amplifier (5) is obtained by converting the excitation waveform (1a) from the excitation waveform ROM (1) having the excitation waveform (1a) into a pulse train by the PWM conversion circuit (10). A resolver excitation method characterized in that it is obtained by using either a pulse train from a PWM waveform ROM (21) recorded in advance with a PWM pulse train (20).   The resolver excitation method according to claim 1, wherein the amplifier (5) is a pulse amplifier for only a switching operation.   The resolver excitation method according to claim 1 or 2, wherein a part of the excitation winding (7) is used as a part of a filter for the excitation signal (8).

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