JPS633671A - motor drive device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a motor drive device that can be used as a drive source for various video equipment, audio equipment, and the like.

2. Description of the Related Art In recent years, motors and motor drive devices have been widely used as drive sources for various types of audiovisual equipment.

Hereinafter, an example of the above-mentioned motor drive device will be described with reference to the drawings.

FIG. 3 is a circuit diagram of a main part of a conventional three-phase brushless motor drive device. In FIG. 3, 60 is a voltage source that supplies voltage to the Hall element 1°2.3 arranged on the stator. 40 is a position signal synthesis circuit that synthesizes position signals for sequentially energizing the armature coils 4, 5.6 from each output of the Hall element 1.2.3; This is a multiplier type power supply circuit that supplies current to the child coils 4, 5, and 6. Reference numeral 20 denotes a voltage-current conversion circuit, which outputs a current proportional to the absolute value of the voltage difference between the reference voltage source 7o and the externally applied torque command voltage ET.

A resistor 11 converts the output current of the voltage-current conversion circuit into a voltage, and the voltage generated at the resistor 11 and the torque limit voltage vTL applied from the outside are input to one input terminal of the error amplifier 3o. The output of the error amplifier 3o is input to the other input terminal of the multiplier type power supply circuit 50. A resistor 12 is a detection resistor that detects the current supplied to the armature coil, and the voltage generated at the resistor 12 is input to the other input terminal of the error amplifier 30, and the error amplifier 30 controls the torque command voltage and the torque limit. A current corresponding to the voltage is supplied to the armature coils 4, 5.6.

FIG. 4 is a specific circuit diagram of the error amplifier 3o. Fourth
In the figure, transistors 31, 32 and 35 are input limiter followers, transistors 31, 32 are connected to a current source 312, and transistor 35 is connected to a current source 314.
is connected. The current source of the current source 312 is the current source 314
It is larger than the current electrician 2. Transistors 33, 34
.

36.3, 38 and current source 313 constitute a differential vomit intensifier. The collector of transistor 38 is connected to one input terminal of the power supply circuit.

The operation of the conventional motor drive device configured as described above will be explained below. Figure 5 shows the torque command voltage E and the resistor 12 that detects the current supplied to the armature coil.
The voltage V generated at It is a characteristic diagram showing the relationship between S. Here, a dead zone ETJJ, Z is provided in the torque command voltage ET so that current is not supplied to the armature coil unless the difference between the reference voltage vr15f and the torque command voltage E is greater than a certain value. This is because the voltage-current This setting is made to eliminate the effects of offset from the conversion circuit and error amplifier. FIG. 4 shows the torque command voltage Σ.

FIG. 3 is a specific circuit diagram of an error amplifier 30 that realizes a dead zone. In the circuit of FIG. 4, I is >12 and 9, the difference v between the base-emitter voltage of transistors 31 and 32 and the base-emitter voltage of transistor 35
Dz is engineering.

■DZ"■T・In-・・・・・・・・・・・・(1
) 2, and the dead zone of the torque command voltage E, T, D, and Z are as follows, where gm is the indicated conductance of the voltage-current conversion circuit.

Problems to be Solved by the Invention However, in the above configuration, the torque command voltage E
In addition to T, there is also a torque limit voltage vTL externally applied to the input of an error amplifier used to set the upper limit of the output torque (current) of the motor, and the voltage of the supply current detection resistor 12 to the armature coil. V.8, that is, an offset voltage VD7. is generated between the inputs of the error amplifier.

In view of the above problems, the present invention provides a torque command voltage E.

dead zones ET, D, Z are provided, and the torque limit voltages v, L and the voltage vc of the supply current detection resistor to the armature coil are provided.
The present invention provides a motor drive device that eliminates the offset with s.

Means for Solving the Problems In order to solve the above problems, the motor drive device of the present invention uses the outputs of a plurality of Hall elements arranged on the stator as an input signal, and sends the outputs to the armature coils of multiple phases. a position signal synthesis circuit that synthesizes energization signals; a multiplier-type power supply circuit that takes the output of the position signal synthesis circuit as one input and supplies current to the armature coil; and an arbitrary torque command given from the outside. a voltage-current conversion circuit that receives a voltage and a reference voltage source as input and outputs a current proportional to the absolute value of the potential difference;
a first converting the output current of the voltage-current conversion circuit into a voltage;
and an error amplifier whose inputs are the voltage generated at the first resistor and an arbitrary torque limit voltage applied from the outside, and the output of the error amplifier is the multiplier type power supply circuit. the other input terminal of the error amplifier, the current supplied to the armature coil is detected by a second resistor, and the voltage generated in the second resistor is supplied to the other input terminal of the error amplifier. A current source that sucks a certain current from the output is connected to the output side of the voltage-current conversion circuit, and a dead zone is provided for the minute amplitude of the torque command voltage.

Effect: With the above-described configuration, the present invention makes it possible to form a dead zone for the torque command voltage without creating an offset between the inputs of the error amplifier by invalidating a certain portion of the output current of the voltage-current conversion circuit. .

Embodiments Hereinafter, motor drive devices according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit configuration diagram of a main part of a three-phase brushless motor drive device according to an embodiment of the cylinder 1 of the present invention. In Figure 1, 6
0 is a voltage source and Hall elements 1.2.0 are arranged on the stator.
Supply voltage to 3. 4° is a position signal synthesis circuit that synthesizes position signals for sequentially energizing the armature coils 4, 5.6 from each output of the Hall element 1.2.3, and 50 is a position signal synthesis circuit that uses the position signal as one input. Armature coil 4, 4.6
This is a multiplier-type power supply circuit that supplies current to the

20 is a voltage-current conversion circuit, and a reference voltage source T.

A current proportional to the absolute value of the voltage difference between the torque command voltage ET and the torque command voltage ET given from the outside is output.

21 is a current source that draws a constant current from the output current of the voltage-current conversion circuit. 11 converts the output current of the voltage-current conversion circuit into a voltage, and the voltage generated at the resistor 11 and the torque limit voltage vTL applied from the outside are input to one input terminal of the error amplifier 3o. The output of the error amplifier 30 is input to the other input terminal of the multiplier type power supply circuit. A resistor 12 is a detection resistor that detects the current supplied to the armature coil, and the voltage generated at the resistor 12 is input to the other input terminal of the error amplifier, and the error amplifier adjusts the torque command voltage and the torque limit. A current corresponding to the voltage is supplied to the armature coil.

The operation of the motor drive device of this embodiment configured as described above will be described below with reference to FIGS. 1 and 2.

FIG. 2 shows the relationship between the torque command voltage F and the voltage vcs generated across the resistor 12 that detects the current supplied to the armature coil. Dead band ET, D of torque command voltage ET
, Z are provided for the reason of energization described in the above conventional example.

In order to realize dead zones ET, D, and Z of the torque command voltage E, a constant current 1. is applied to the output of the voltage-current conversion circuit. It is equipped with a current source 21 that draws in the current. When the output current 1 of the voltage-current conversion circuit is 1, no voltage is generated in the resistor 11, and the dead zone ET, D of the torque command voltage E,
This means that Z can be realized. The dead zones "T, D, and Z of the torque command voltage ET are expressed as follows, where gm is the transfer conductance of the voltage-current conversion circuit.

As described above, according to this embodiment, a current source that sinks a constant current between the voltage-current conversion circuit that outputs a current that is absolutely (directly proportional to) the voltage difference between the torque command voltage and the reference voltage and the error amplifier. By providing , it is possible to configure a dead zone for the torque command voltage.

Effects of the Invention As described above, according to the present invention, the torque command voltage can be adjusted without causing an offset between the torque limit voltage input to the error amplifier and the voltage of the resistor that detects the current supplied to the armature coil. It is possible to obtain an excellent effect of forming a dead zone.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of a motor drive device according to an embodiment of the present invention, FIG. 2 is its input/output characteristic diagram, FIG. 3 is a circuit diagram of a conventional motor drive device, and FIG. 4 is a diagram of the circuit configuration of a conventional motor drive device. The main circuit diagram, FIG. 5, is an input/output characteristic diagram of a conventional example. 1, 2.3... Hall element, 4, 5.6...
... Armature coil, 11.12 ... - ... Resistance, 2
0... Voltage-current conversion circuit, 21... Current source, 3o... Error amplifier, 40... Position signal synthesis circuit, 50... power supply circuit, 60
．． 70... Voltage source. Name of agent: Patent attorney Toshio Nakao and 1 other person77
, /2-m-Resistance 2o-Heavy pressure-Drop: L change 100 21- Electric turn source 30- Chivalry wetting device 40. Figure 60,70''- Voltage regulator 2nd section Figure 3/Goo... Resistor Figure 5 hef

Claims (1)

[Claims] A position signal synthesis circuit that uses the outputs of multiple Hall elements arranged on the stator as an input signal and synthesizes energization signals to the armature coils of multiple phases, and the output of this position signal synthesis circuit as one input. , a multiplier-type power supply circuit that supplies current to the armature coil, an arbitrary torque command voltage given from the outside, and a reference voltage source as inputs, and a voltage that outputs a current proportional to the absolute value of the potential difference. - a current converter circuit, a first resistor that converts the output current of the voltage-current converter circuit into a voltage, and one input that receives the voltage generated in the first resistor and an arbitrary torque limit voltage applied from the outside; the output of the error amplifier is used as the other input of the multiplier type power supply circuit, the current supplied to the armature coil is detected by a second resistor, and the output of the error amplifier is A current source is connected to the output side of the voltage-current conversion circuit, which draws a certain current from the output. A motor drive device characterized in that a dead zone is provided for minute amplitudes of the torque command voltage.