JP2000262081A - Direct drive motor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the precision of compatibility between a drive unit and a motor in exchanging the drive unit because of failure, maintenance or the like, by providing correcting data for detecting and processing a position for a motor part having a resolver as a position transducer, and providing a memory for reading the correcting data into the drive unit. SOLUTION: A motor part 10 involves a resolver 11 as a position transducer and unique correcting data 12 suited to the motor for detecting and processing a position. The correcting data 12 is implemented on the motor part 10 as a ROM and loaded into a memory 21 on a drive unit 20 when the power of a system is turned on. N-phase to two-phase converting circuit 13 converting the polyphase output signal of the resolver 11 into a two-phase output signal is also mounted on the motor part 10. The position detecting circuit (RDC) 22 of a drive unit 20 inputs a resolver signal converted into the two-phase signal, and performs position detection processing based on the correcting data loaded into the memory 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct drive motor (hereinafter referred to as a DD motor), and more particularly to a DD motor having a resolver as a position detector, for example, a megatorque motor and a megathrust motor.

[0002]

2. Description of the Related Art D for directly driving a load without using a speed reducer
The D-motor has been evaluated for its performance (high rotational accuracy, compactness, and maintenance-free) for consumer equipment, particularly for audio and video, and has been put into practical use from an early stage.
Megatorque motors and megathrust motors apply this performance for industrial use.

A megatorque motor is an inductor type VR.
(Variable reactance) type is adopted, and the following features are evaluated, and it is mainly adopted as a general industrial high precision index. In other words, since permanent magnets are not used, the cost can be reduced.Since the resolver is used for the position detector, it is hardly affected by oil mist etc., it is mechanically robust, and its reliability as a detector Built-in high-rigidity bearing, can receive load directly, can use hollow structure as space for piping, wiring, etc., so that devices can be compactly assembled, built-in position detection function in drive unit This eliminates the need for a host controller (pulse train output controller).

The megathrust motor is a linear expansion of the principle and structure of a megatorque motor. The features of the megathrust motor are basically the same as those of the megatorque motor, and are mainly used for high-speed transport of lightweight objects.

In a conventional DD motor (mega-torque motor and mega-thrust motor) system using a resolver, as shown in FIG. 4, a resolver is provided in a motor section, and a multi-phase output (three phases in the figure) from the resolver is provided. It is taken into the drive unit and is output to the two-phase output (S
(1N, COS) signal and output a digital position signal using an R / D converter and correction data.

[0006]

By the way, correction data is necessary for improving the accuracy of position detection, and this correction data differs depending on each motor. Further, the low resistance value of the phase conversion circuit varies. Therefore, when the drive unit is replaced due to failure, maintenance, or the like, the compatibility with the motor is poor.

[0007]

In order to solve the above problems, the present invention provides a motor unit having a resolver as a position detector and a drive unit having a position detection circuit for performing position detection processing based on a resolver signal. Become DD
In the motor system, the motor unit further includes correction data used for position detection processing, and the drive unit further includes a memory for reading the correction data.

Preferably, in the present invention, the position detection circuit converts a polyphase output signal from the resolver into a two-phase output signal, and outputs the two-phase converted resolver signal and correction data read into the memory. The position detection process can be performed based on the above.

In the present invention, apart from this, the motor unit further has a phase conversion circuit for converting a multi-phase output signal from a resolver into a two-phase output signal, and the position detection circuit of the drive unit includes: Position detection processing may be performed based on the resolver signal from the phase conversion circuit and the correction data read into the memory.

In the present invention, the position detection circuit may be provided not in the drive unit but in the motor unit, and the correction data may be supplied to the position detection circuit in the motor unit to perform position detection. good.

That is, the direct drive motor system of the present invention has a motor unit and a drive unit for controlling the drive of the motor of the motor unit, a resolver as a position detector for the motor, and a resolver signal based on the resolver signal. And a position detection circuit for performing position detection processing by using the resolver, the position detection circuit, and correction data used for the position detection processing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings. FIG. 1 shows a configuration of a DD motor system according to the present invention.

In FIG. 1, a motor unit 10 has correction data 12 used for position detection processing in addition to a resolver 11 as a position detector. The correction data is, for example, RO
M is mounted on the motor unit, read into the memory 21 provided in the drive unit 20 when the system is powered on, and used for position detection processing. The motor section 10 is further provided with a phase conversion circuit 13 for converting a multi-phase output signal from the resolver 11 into a two-phase output signal.

On the other hand, the drive unit 20 has a position detecting circuit 22 for performing position detecting processing based on the resolver signal.
Is provided. The position detection circuit 22 receives the resolver signal subjected to the two-phase conversion, and performs a position detection process based on the R / D converter 22 and the correction data read into the memory 21.

According to the present invention, as shown in FIG. 2, the phase conversion circuit 13 is connected to the drive unit 20 in the same manner as in the prior art.
It may be a configuration provided inside. In this case, the drive unit 20 converts the polyphase output signal from the resolver 11 into a two-phase output signal, and calculates a position based on the two-phase converted resolver signal and the correction data read into the memory 21. Perform detection processing.

Further, in the present invention, as shown in FIG.
2 is also provided in the motor unit 10, the correction data 12 is supplied to the R / D converter 22 in the motor unit 10, the position detection incorporating the correction is performed in the motor unit 10, and the position output is output from the motor unit 10 to the drive unit 20. Can also be supplied.

[0017]

In the DD motor system according to the present invention, different correction data for each motor is provided in the motor unit, and the position detection processing is performed by incorporating the correction data. Therefore, the fixed correction data corresponding to the motor is stored in the motor unit. If a drive unit is replaced due to failure or maintenance, high-precision position detection using correction data is not impaired (low-speed ripple, low noise, low torque ripple, and low vibration can be realized). The compatibility between the motor unit and the drive unit is maintained.

Further, since the low resistance value of the phase conversion circuit varies, even if the drive unit is replaced by providing this phase conversion circuit in the motor section, the phase conversion circuit is compared with the conventional case where the phase conversion circuit is provided in the drive unit. However, the interchangeability between the motor unit and the drive unit is further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of a DD motor system according to the present invention.

FIG. 2 is a block diagram of a DD motor system according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a third embodiment of the DD motor system according to the present invention.

FIG. 4 is a block diagram showing a position detection circuit of a conventional DD motor system.

[Explanation of symbols]

 Reference Signs List 10 Motor unit 11 Resolver 12 Correction data 13 Phase conversion circuit 20 Drive unit 21 Memory 22 R / D converter

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Kuwahara 78 Toba-cho, Maebashi-shi, Gunma Nippon Seiko Co., Ltd. Inventor Masamitsu Uemura 78 Toba-cho, Maebashi-shi, Gunma F-term (reference) in NSK Ltd.

Claims (4)

[Claims] 1. A direct drive motor system comprising: a motor unit having a resolver as a position detector; and a drive unit having a position detection circuit for performing position detection processing based on a resolver signal, wherein the motor unit further includes a position detection unit. A direct drive motor system having correction data used for processing, wherein the drive unit further has a memory for reading the correction data. 2. The position detection circuit converts a polyphase output signal from the resolver into a two-phase output signal, and detects a position based on the two-phase converted resolver signal and correction data read into the memory. The direct drive motor system according to claim 1, wherein a detection process is performed. 3. The motor unit further includes a phase conversion circuit for converting a polyphase output signal from a resolver into a two-phase output signal, and the position detection circuit of the drive unit includes a resolver signal from the phase conversion circuit. The direct drive motor system according to claim 1, wherein a position detection process is performed based on the correction data read into the memory. 4. A position detecting circuit having a motor unit, a drive unit for driving and controlling the motor of the motor unit, a resolver as a position detector for the motor, and a position detecting circuit for performing a position detecting process based on the resolver signal. A direct drive motor system comprising: a direct drive motor system including: the resolver; the position detection circuit; and correction data used for position detection processing of the position detection circuit.