JP2000228893A - Tacho generator device for built-in brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize low ripped in a tacho-generator by providing a resolver winding, a resolver stator winding and a resolver/digital converter connected with the resolver stator winding to obtain an angular signal from the resolver/ digital converter. SOLUTION: A resolver 10 provides a resolver rotor winding 21 to impress an exciting signal 20 via a rotary transformer to rotate with a motor axis 3, and also fixes a resolver stator winding 22 in the same manner as an output winding 4 corresponding to the resolver rotor winding 21. The angular signals (a) to (d) corresponding to the phases A to D which are rotating angles of a magnet rotor 2 outputted from the resolver stator winding 22 are subjected to the A/D conversion with a resolver/digital converter 23, and are impressed to the gates 5 to 8 for the ON/OFF control. As a result, the environmental condition for a wider area can be attained and ripple elements in angular signals can be lowered to realize reduction in size of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tachogenerator device having a built-in brushless motor, and more particularly, to turning on or off each gate for switching output voltages of a plurality of phases by an angle signal obtained from a resolver attached to a motor shaft of the brushless motor. The present invention relates to a new improvement for widening the conditions of use of the motor, miniaturizing the motor, and reducing the ripple of the tachogenerator by performing on / off.

[0002]

2. Description of the Related Art Conventionally, as a tachogenerator device with a built-in brushless motor of this type, a configuration shown in FIG. 2 has been generally employed. That is, FIG.
Is a tachogenerator incorporated in a brushless motor (not shown), and a magnet rotor 2 of the tachogenerator 1 is provided so as to be able to rotate integrally with a motor shaft 3 of the brushless motor. An output winding 4 consisting of four phases A to D corresponding to the magnet rotor 2 is fixed to the case of the brushless motor, and output voltages 4a to 4d of four phases output from the output winding 4 are four. The signal is input to the operational amplifier 9 through the gates 5 to 8. The gates 5 to 8 receive angle signals a to d from a position detector 10 provided in the tacho generator 1 and detecting the position, that is, the angle, of the magnet rotor 2, and receive angle signals a to d in a four-phase state. The gates 5 to 8 are sequentially turned on / off for switching. The angle signals a to d are used as phase switching signals of the brushless motor.

Next, the operation will be described. When the brushless motor starts, the magnet rotor 2 of the tachogenerator 1 rotates, and four-phase output voltages 4a to 4d are generated. These four-phase output voltages 4a to 4d are
The phase signals are sequentially switched according to the angle signals a to d from 0, and the operational amplifier 9 outputs the output voltages 4a to 4d in a continuous state as a tachogenerator output 9a.

[0004]

The conventional tachogenerator with built-in brushless motor has the following problems because it is configured as described above. That is, as a position detector, a Hall element, that is, a Hall I
Since the position of the magnet rotor was detected by using C as a sensor, the temperature resistance characteristics of this sensor were not sufficient, and the operating condition of the motor was determined by the environmental condition of the Hall IC. Therefore, it is difficult to use the motor at a high temperature, and at the same time, it is difficult to generate a torque of a certain level or more. In addition, this Hall IC has poor switching accuracy, and includes a ripple in the angle signal, and it is difficult to remove the ripple.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in particular, each gate for switching output voltages of a plurality of phases by an angle signal obtained from a resolver attached to a motor shaft of a brushless motor. ON /
An object of the present invention is to provide a tachogenerator device with a built-in brushless motor in which turning off is performed to achieve a wider range of motor use conditions, a smaller motor size, and a lower ripple of the tachogenerator.

[0006]

According to the present invention, there is provided a brushless motor built-in tachogenerator having a plurality of phases of output windings fixedly arranged corresponding to a magnet rotor provided on a motor shaft of the brushless motor. A brushless motor built-in tachogenerator device which turns on / off each gate for switching a plurality of phases of output voltage obtained from the output winding using an angle signal indicating the angle of the tachogenerator so as to obtain a continuous tachogenerator output. A resolver rotor winding provided on the motor shaft, a resolver stator winding provided corresponding to the resolver rotor winding, and a resolver / digital converter connected to the resolver stator winding, The angle signal is obtained from the resolver / digital converter, and The resolver / digital converter and each gate are formed separately from the brushless motor and are provided in a motor driver for controlling the drive of the brushless motor. This configuration is used as a phase switching signal of a motor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a tachogenerator with a built-in brushless motor according to the present invention will be described below with reference to the drawings. Note that the same or equivalent parts as those in the conventional example will be described using the same reference numerals. In FIG. 1, reference numeral 1 denotes a tachogenerator built in a well-known brushless motor (not shown), and a magnet rotor 2 of the tachogenerator 1 is provided so as to be able to rotate integrally with a motor shaft 3 of the brushless motor. I have.

The phase A to the phase corresponding to the magnet rotor 2
An output winding 4 composed of four D-phases is fixed to the case of the brushless motor, and four-phase output voltages 4a to 4d output from the output winding 4 are output through four gates 5 to 8. .

Each of the gates 5 to 8 has an angle signal a to a well-known resolver 10 provided in the tachogenerator 1 for detecting the position, that is, the angle, of the magnet rotor 2.
The gates 5 to 8 are sequentially turned on / off by d to be switched. The angle signals a to d are used as phase switching signals (commitment signals) of the brushless motor.

The resolver 10 is provided so that a resolver rotor winding 21 to which an excitation signal 20 is applied via a well-known rotary transformer (not shown) can rotate together with the motor shaft 3. Winding 2
1, a four-phase resolver stator winding 22 is fixedly disposed similarly to the output winding 4.

A phase to D, which are rotation angles of the magnet rotor 2 output from the resolver stator winding 22,
The angle signals a to d corresponding to the phases are A / D-converted by a well-known resolver / digital converter 23 and the respective gates 5 to 5 are converted.
8 is applied to turn on / off the gates 5 to 8. The left side of the dashed line in FIG. 1 is the brushless motor 100 side, and the right side is a motor driver 1 as a drive circuit for controlling the rotational drive of the brushless motor.
The tachometer 1 and the resolver 10 are provided on the brushless motor 100 side, and the gates 5 to 8 and the resolver / digital converter 23 are provided on the motor driver 101 side.

Next, the operation will be described. When the brushless motor 100 is started, the magnet rotor 2 of the tachogenerator 1 rotates to output four-phase output voltages 4a to 4d.
Occurs. The four-phase output voltages 4a to 4d are sequentially switched in phase order by angle signals a to d from the resolver 10, and the output voltages 4a to 4d are continuous (strictly, there may be a slight interval). Then, a voltage of a level corresponding to the rotation speed is output as the tachogenerator output 9a. In the above-described embodiment, the case of four phases has been described, but other than four phases is also possible.

[0013]

The tachogenerator for a brushless motor according to the present invention is constructed as described above, so that the following effects can be obtained. That is, the rotational position of the magnet rotor of the tachogenerator, that is, the angle signal is extracted from the resolver that rotates simultaneously with the tachogenerator, and each gate is turned on / off using this angle signal.
The phase switching of the off and brushless motors is performed, so that the operating temperature of the motor can be raised, the environmental conditions can be widened, the ripple component of the angle signal can be reduced, and only the mechanical elements are required on the motor side. Therefore, the size of the motor can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a tachogenerator device for incorporating a brushless motor according to the present invention.

FIG. 2 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Tach generator 2 Magnet rotor 3 Motor shaft 4 Output winding 5 to 8 Gate 4 a to 4 d Output voltage 9 a Tach generator output 21 Resolver rotor winding 22 Resolver stator winding 23 Resolver / digital converter a to d Angle signal 100 Brushless motor 101 Motor driver

Claims (3)

[Claims] 1. A multi-phase output winding (4) is fixedly arranged corresponding to a magnet rotor (2) provided on a motor shaft (3) of a brushless motor (100). Each of the gates (5 to 8) for switching the multi-phase output voltage (4a to 4d) obtained from the output winding (4) using the angle signals (a to d) indicating the angles is turned on / off and continuously And a resolver rotor winding (21) provided on the motor shaft (3) and a resolver rotor winding (21). Resolver stator winding provided
(22), and a resolver / digital converter (23) connected to the resolver stator winding (22), wherein the angle signal (a
And -d) a tachogenerator device with a built-in brushless motor, characterized in that it is obtained from the resolver / digital converter (23). 2. The motor for controlling the drive of the brushless motor (100), wherein the resolver / digital converter (23) and each of the gates (5 to 8) are formed separately from the brushless motor (100). 2. The tachogenerator device for incorporating a brushless motor according to claim 1, wherein the tachogenerator device is provided in a driver. 3. The tachogenerator device with built-in brushless motor according to claim 1, wherein the angle signals (a to d) are used as phase switching signals of the brushless motor (100).