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
  • H02P6/08—Arrangements for controlling the speed or torque of a single motor
  • H02P6/085—Arrangements for controlling the speed or torque of a single motor in a bridge configuration
• • 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 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 a rotor magnetic pole position detector is omitted.
• This relates to driving a brushless motor to make a smooth transition from synchronous operation mode to rotor position detection continuous rotation mode.
• a brushless motor requires a detector to detect the magnetic pole position of its rotor.
• this brushless motor is used for a compressor of an air conditioner, the reliability of the detector under high temperature and high pressure conditions Therefore, these detectors cannot be used.
• the voltage signal induced in the armature winding is detected without using the magnetic pole position detector, and the commutation signal of the motor is determined based on the voltage signal. The generation method is used.
• the method of switching between the synchronous operation mode and the rotor position detection operation mode is difficult to make transition while maintaining a stable operating state that has been devised in various ways, and may cause mechanical vibration or drive current It often causes an instantaneous increase and imposes a burden on the semiconductor switching elements for motor driving.
• the present invention provides a configuration in which the relationship between the rotation speed of the synchronous operation mode and the rotation speed of the rotor position detection operation mode is such that the rotation speed of the rotor position detection operation mode is the same as or lower than the rotation speed of the synchronous operation mode. It is equipped with.
• the present invention includes a three-phase armature winding connected to a neutral point non-ground, a DC power supply, a semiconductor switching element group for energizing and interrupting a current to the armature winding, and a magnet rotor.
• a brushless motor a start command unit, a synchronizing signal generating unit that outputs a synchronizing signal in response to a command from the starting command unit, and a signal output from the synchronizing signal generating unit to the armature winding.
• a relative position between the armature winding and the magnet rotor is detected by a rotating magnetic field generating means for generating a rotating magnetic field, and a voltage signal induced in the armature winding.
• Switching means for selecting and outputting the output signal of the rotating magnetic field generating means and the output signal of the position detecting means, and outputting a switching command to the switching means; and
• a driving signal generating means for generating a driving signal of the switching element group using an output signal of the switching means; a duty ratio commanding means; and a command of the duty ratio commanding means for an output signal of the driving signal generating means.
• Pulse width modulation means for performing pulse width modulation based on the following.After the command from the start command means, the frequency of the output signal of the synchronous signal generation means and the duty ratio command are output to start the magnet rotor. After startup, a configuration is provided in which the switching means is switched to drive the brushless motor based on the output signal of the position detecting means.
• the rotation speed is a force determined by the motor characteristics and the load state with respect to the duty ratio given.
• the present invention employs the above-described configuration to achieve the rotation speed of the synchronous operation mode and the rotor position detection operation.
• the relationship between the rotation speeds of the modes is set so that the rotation speed of the rotor position detection operation mode is the same as or lower than the rotation speed of the synchronous operation mode, the rotation speed, the duty ratio, and the rotation speed in the synchronous operation mode.
• FIG. 1 is a block diagram of a brushless motor driving device according to an embodiment of the present invention.
• a Fig. 2 is a configuration showing details of the device.
• Fig. 3 is a waveform of each part in the configuration diagram of Fig. 2. Is in the same device
• FIG. 7 is a waveform diagram showing a relationship between a rotation speed and a duty ratio in a synchronous operation mode and a rotor position detection operation mode.
• FIG. 1 is a block diagram of a brushless motor starting device according to an embodiment of the present invention.
• 1 is a DC power supply
• 2 is a group of semiconductor switching elements, and is composed of six transistors and six diodes each connected in anti-parallel.
• Numeral 3 consists of a three-phase armature winding 4 and a magnet rotor 5 connected by a brushless motor.
• 6 is a position detecting means
• 7 is a switching means
• 8 is a driving signal generating means
• 9 is a pulse width modulating means
• 10 is a synchronizing signal generating means
• 11 is a rotating magnetic field generating means
• 1 is a starting command means
• 1 is a starting command means.
• 3 is a switching command means
• 14 is a duty ratio command means.
• the output signal of the rotating magnetic field generating means 11 is transmitted to the drive signal generating means 8 by the switching means 7, and the output signal is subjected to the pulse width modulation set for the synchronous operation mode. Then, the transistors of the semiconductor switching element group 2 are driven to start the brushless motor 3.
• the position detection means 6 detects the magnetic pole position of the magnet rotor 5 from the induced voltage generated in the armature winding 4, and the signal is switched by the switching means 7 to the drive signal generation means. 8 and pulse width modulation set for the rotor position detection mode to drive the transistors of the semiconductor switching element group 2 to control the brushless motor 3.
• FIG. 2 A more specific configuration of the block diagram in Fig. 1 In FIG. 1, the same components as those in FIG. 1 or those having the same functions are denoted by the same reference numerals.
• Reference numeral 6 denotes a position detection circuit, which comprises three filters 61 to 63 and a comparator 64 power.
• 7 is the switching time 3 ⁇ 4 8 is the drive signal generation time ⁇ 9 is the pulse width modulation time 3 ⁇ 4 10 is the synchronization signal generation time 3 ⁇ 4 11 is the rotating magnetic field generation time 3 ⁇ 4 13 is the switching command time ⁇ 15 is the micro computer Outputs start command signal 15 1 to synchronous signal generation circuit 10 and duty ratio command signal 15 3 to pulse width modulation circuit 9, corresponding to start command means 12 and duty ratio command means 14 in Fig. 1. I do.
• the microcomputer 15 outputs a start command signal 151, a switching signal 152, and a duty ratio command signal 153 at the same time.
• Synchronous signal generating circuit 10 that has received start command signal 15 1 outputs synchronous signal 100 as shown in FIG.
• the rotating magnetic field generation circuit 11 outputs the signals 111-113 shown in FIG.
• the switching circuit 7 is a circuit for switching whether the input signals 8 7 to 89 of the drive signal generating circuit 8 are used as output signals of the position detecting circuit 6 ⁇ output signals of the rotating magnetic field generating circuit 11.
• the switching signal 15 2 is further switched to the output signal side of the rotating magnetic field generation circuit 11.
• the output signals 11 1 to 11 of the rotating magnetic field generation circuit 11 are taken into the drive signal generation circuit 8 and output from the circuit 8 1 to 86 shown in FIG. These output signals ⁇ 8 1 to 8 3 are further added to the pulse width modulation circuit 9. Pulse width modulation is performed on the basis of the duty ratio command signal 15 3 set for the synchronous operation mode, and becomes drive signals of the transistors Q 1 to Q 3 of the semiconductor switching element group 2 respectively. .
• the output signals 84 to 86 of the drive signal generation circuit 8 (the drive signals of the transistors Q 4 to Q 6 of the semiconductor switching element group 2 as they are. The switching of the transistor results in the generation of a rotating magnetic field in the armature winding 4, the rotation of the magnet rotor 5 and the activation of the brushless motor 3.
• the synchronous signal 1000 and the duty ratio command signal 1553 set for the synchronous operation mode are output, and the brushless motor rotates.
• the switching command circuit 13 After startup, the switching command circuit 13 outputs the switching signal 15 2 and switches the switching circuit 7 to the position detection circuit 6 side. As a result, the input signals 87 to 89 of the start signal generating circuit 8 become the output signals 6 41 to 6 43 of the position detecting circuit 6, and the induced voltage signal 4 generated in the armature winding 4 is reduced by £ 1.
• the brushless motor 3 is driven by 1 to 43.
• the switching signal 15 2 simultaneously outputs the duty ratio command signal set for the rotor position detection operation mode from the micro computer 15. Following the fall of the switching signal 15 2, the start command signal 15 1 is released and a series of start operation procedures are reset to the initial state.
• the synchronous signal 100 so that the rotational speed when the synchronous operation mode is shifted to the rotor position detection operation mode is equal to or lower than the rotational speed of the synchronous operation mode.
• super-motion is performed with the rotation speed r0 and the duty ratio d0. This is set in consideration of constraints such as the motor specifications, load conditions, and the allowable current value of the semiconductor switching element group.
• the duty ratio is set to d1 and the rotational speed r1 is set. r 1 ⁇ r 0.
• This operation makes it possible to smoothly switch from the synchronous operation mode to the rotor position detection operation mode. For example, if the duty ratio in the rotor position detection operation mode is set to d2, the number of rotations r2 will be r2> r0, and sudden acceleration will occur when shifting to the rotor position detection operation mode. Smooth mode switching cannot be expected.
• the duty ratio command signal 15 is output from the microcomputer 15 as an applied voltage control command for controlling the speed of the brushless motor 3.
• the synchronizing signal generating circuit 10, the rotating magnetic field generating circuit 11, and the switching command circuit 13 are independent circuits, respectively.Even if the microcomputer 15 performs part or all of these rotating functions, Good.
• the present invention ⁇ a three-phase armature winding connected to a neutral point non-ground, a DC power supply, a semiconductor switching element group that blocks and interrupts a current to the armature winding, and a magnet rotation.
• a brushless motor having a motor, start command means, and a command from the start command means.
• Synchronizing signal generating means for outputting a synchronizing signal, rotating magnetic field generating means for generating a rotating magnetic field in the armature winding using a signal output from the synchronizing signal generating means, Position detecting means for detecting a relative position between the armature winding and the magnet rotor based on a voltage signal, and selecting and switching an output signal of the rotating magnetic field generating means and an output signal of the position detecting means.
• Switching means for outputting a switching command to the switching means, switching command means for giving a switching command to the switching means, drive signal generating means for generating a driving signal for the switching element group using an output signal of the switching means, and duty ratio command means.
• pulse width modulation means for performing pulse width modulation on an output signal of the drive signal generation means based on a command from the duty ratio command means, wherein an output of the synchronization signal generation means is provided.
• Signal frequency, the duty ratio of the synchronous operation mode and the duty ratio of the rotor position detection operation mode, the rotor speed of the rotor position detection operation mode may be the same as or lower than the rotation speed of the synchronous operation mode.

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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)

Family

ID=12410871

Family Applications (1)

Country Status (4)

Cited By (1)

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Citations (1)

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• 1990
  • 1990-02-14 JP JP2034320A patent/JP2722750B2/ja not_active Expired - Fee Related
• 1991
  • 1991-02-12 DE DE4190250A patent/DE4190250C2/de not_active Expired - Fee Related
  • 1991-02-12 WO PCT/JP1991/000160 patent/WO1991012652A1/ja active Application Filing
  • 1991-02-12 KR KR1019910701341A patent/KR940009209B1/ko not_active IP Right Cessation
  • 1991-02-12 DE DE19914190250 patent/DE4190250T/de active Pending

Patent Citations (1)

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