Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
  • H02P6/04—Arrangements for controlling or regulating the speed or torque of more than one motor
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
  • H02P6/14—Electronic commutators
  • H02P6/16—Circuit arrangements for detecting position
  • H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
  • H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings

Definitions

• the present invention relates to a brushless motor, and more particularly, to a brushless motor in which a relative position between a magnet rotor and an armature winding is detected by an induced voltage induced in an armature winding, and operation is performed based on the position detection signal.
• the present invention relates to a device for operating a brushless motor.
• a brushless motor requires a detector to detect the magnetic pole position of its rotor. If it is difficult to use this magnetic pole position detector, the magnetic pole position detector is omitted and the armature winding is omitted.
• a method of generating a commutation signal of a motor based on the induced voltage signal is used. The method will be described below.
• Fig. 1 shows the configuration of the brushless motor operating device of this method.
• Fig. 1 shows a DC power supply
• 2 shows a group of semiconductor switching elements, and six transistors U to Z and six diodes connected in anti-parallel to each other.
• Consisting of Reference numeral 3 denotes a brushless motor, which comprises an armature winding 4 and a magnet rotor 5 connected in three phases.
• Reference numeral 6 denotes a filter for waveform processing of a voltage signal induced in the armature winding 4
• ⁇ 7 is a comparator for comparing the output signal of the filter circuit 6
• ⁇ 8 is an output signal of the comparator 7
• the filter circuit 6 an integrating circuit is provided after the differentiating circuit shown in FIG. 4 (A), and a differentiating circuit is provided after the integrating circuit shown in FIG. Circuit has been devised.
• FIG. 2 shows the relationship between the voltage signal induced in the armature winding 4, the output signal of the filter circuit 6, and the output signal of the comparison circuit 7 for one U-phase.
• an output signal obtained by subjecting the U-phase induced voltage Vu to waveform processing by the filter circuit 6U looks like 60U.
• the induced voltages V v and V w of the V phase W are subjected to waveform processing by the filter circuits 6 V and 6 W, respectively, to be 60 V and 60 W, and the combined waveform of these is 71 U.
• the comparison circuit 7 compares the signals 611 and 711 to obtain a comparison circuit output of 70 U.
• This output signal is a position detection signal of the magnet rotor 5.
• the above waveform processing is also performed for the W phase W phase, and the position detection signals 70 V and 70 W are obtained, respectively.
• These position detection signals 70U to 70W are signals having different phases by 120 ° as shown in FIG.
• These position detection signals are logically operated by the control circuit 8 to generate commutation signals 8U to 8Z.
• Transistors of the semiconductor switching element group 2 are switched by these commutation signals, and the torque is continuously generated in the brushless motor 3.
• the above operation mode is called the position detection operation mode.
• the filter circuit configuration as shown in Fig. 4 above (the capacitor 6c of the differentiating circuit and the capacitor 6e of the integrating circuit are required to withstand the high voltage of the power supply voltage).
• an electrolytic capacitor is often used.
• the electrolytic capacitor has poor high frequency characteristics, and the stability of the position detection signal with respect to load fluctuations is low. It becomes worse and the motor loses synchronism easily when the load fluctuates.
• both circuits have no discharge path of the capacitor 6c in the differentiating circuit, and always have a direct current when the brushless motor is stopped.
• the output of the filter circuit for example, 60 U for the U phase
• the output of the filter circuit immediately after the start of the synchronous operation mode also has a DC component as shown by the dotted line in FIG. Has a problem that it is easy to fail to move if it does not attenuate when shifting to the position detection operation mode.
• a brushless motor operating device includes a DC power supply, a semiconductor switching element group for energizing and interrupting a current to an armature winding of the brushless motor, and a waveform processing of an induced voltage induced in the armature winding.
• Capacitors in the filter circuit can be configured with low withstand voltage products, making it possible to reduce the size and cost of equipment. Furthermore, with the reduction of the withstand voltage, it is easy to use a compact condenser with good high-frequency characteristics, and the life of the circuit for stabilizing the position detection signal against load fluctuations can be extended. By providing a discharge path for the capacitor, when the brushless motor is started, there is no residual DC component in the capacitor, and the transition from the synchronous operation mode to the position detection operation mode can be performed smoothly.
• Fig. 1 shows the configuration of a conventional brushless motor operating device.
• 3 ⁇ 4 Fig. 2 shows the waveforms of the conventional filter circuit and comparison circuit.
• 3 ⁇ 4 Fig. 3 shows the timing chart of the same position detection signal and commutation signal.
• Fig. 5 shows the configuration of the filter circuit.
• Fig. 5 shows the output waveform of the filter circuit at the time of startup.
• Fig. 6 shows the main configuration of the brushless motor operating device according to one embodiment of the present invention.
• FIG. 6 is a configuration diagram of the filter circuit 6, the comparison circuit 7, and the control circuit 8 of the present embodiment.
• the filter circuit 6 is used to generate the U, V, and W Filter circuit 6 U, 6 V, 6 W for waveform processing of voltage
• filter circuit 6 U consists of resistors 6 a, 6 b, capacitor 6 c, integration circuit 6 d, resistor 6 a 6b, a capacitor 6c is arranged in series at the subsequent stage, and an integrating circuit 6d is arranged at the subsequent stage.
• the comparison circuit 7 outputs a filter circuit output of 60 U to 60 W for three phases, compares itself with a composite wave of the other two phases, and outputs a position detection signal 70 U to 70 W. Based on this, the control circuit 8 generates commutation signals 8U to 8Z shown in FIG. '
• the induced voltage Vu of the armature winding 4 is divided by the resistors 6a and 6b, and the voltage across the resistor 6b is 6b / (6a + 6 b) * V u
• the voltage across the resistor 6b can be kept low.
• the E path after the resistor 6b can be a low-voltage circuit, and the capacitors 6c and 6e used in the differential integration circuit can also use low-voltage products.
• the DC component is discharged through the DC resistor 6b stored in the capacitor 6c of the differentiating circuit, and the DC component does not remain in the capacitor 6c when the brushless motor is stopped. A smooth transition to the position detection operation mode is possible.
• the integration circuit may be a circuit using an operational amplifier, and may be a first-order delay circuit including a resistor and a capacitor.
• the DC power supply of the present invention a semiconductor switching element group for energizing and interrupting a current to an armature winding of a brushless motor, and a plurality of filters for waveform-processing an induced voltage induced in the armature winding.
• the transition from synchronous operation mode to position detection operation mode can be performed smoothly when the brushless motor starts, without any DC component remaining in the capacitor.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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ID=12410898

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Citations (1)

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• 1990
  • 1990-02-14 JP JP2034321A patent/JP2738109B2/ja not_active Expired - Fee Related
• 1991
  • 1991-02-12 KR KR1019910701342A patent/KR940009210B1/ko not_active Expired - Fee Related
  • 1991-02-12 DE DE4190249A patent/DE4190249C2/de not_active Expired - Fee Related
  • 1991-02-12 WO PCT/JP1991/000161 patent/WO1991012653A1/ja active Application Filing
  • 1991-02-12 DE DE19914190249 patent/DE4190249T/de active Pending

Patent Citations (1)

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