JPH03203589A - Drive circuit for brushless motor - Google Patents

Abstract

PURPOSE:To perform starting certainly in a short time by heightening the voltage of synchronous operation over multiple steps, and by making the voltage in stable synchronous operation. CONSTITUTION:At starting, by a start controller 6, synchronous operation with first low constant voltage is specified to a position detecting rotation controller 5. Synchronous voltage is low, and so a magnet rotor 4 starts rotating however great inertia moment may be. Then, initial rotation is obtained and after that, by a start controller 6, voltage is increased in order from the first voltage to a second voltage. Then, the magnet rotor 4 is accelerated according to the increment of the voltage. On a step for stabilizing the synchronous operation with the second voltage, the input of voltage signal generated from an armature winding 3, to a switch element group 1 is provided, and steady-state synchronous-operation is started.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a brushless motor drive that detects the relative position between a magnet rotor and an armature winding by an induced voltage applied to the brushless motor and induced in the armature winding. Regarding equipment.

Conventional technology Conventionally, this type of brushless motor
It has a configuration as shown in FIG. 5, which is also seen in 519. In the figure, 1 is a switching element, 2 is a brushless motor, 3 is an armature winding, 4 is a magnet rotor, and 5 is a position detection rotation control device. The position detection rotation control device 5 is connected to the armature winding 3 and receives the induced voltage generated when the magnet rotor 4 rotates.The position detection rotation control device 5 controls the rotation based on the input induced voltage. A signal is generated and sent to the switching element group 1 to rotate the magnet rotor 4. The method of generating the rotation signal is described in detail in Japanese Patent Publication No. 59-36519, and will not be described here. In such a configuration, at the start of operation, the magnet rotor 4 is stopped and the signal from the armature winding 3 is not input to the position detection rotation control device 5, so the magnet rotor 4 cannot be rotated. ~ Therefore, special public service No. 59-36520
In addition to the above configuration, a synchronizing signal generator and a phase comparator are installed as shown in FIG. This rotation causes the armature winding 3 to rotate synchronously, generates an induced voltage in the armature winding 3, compares this induced voltage with the synchronizing signal, detects that the phase difference between the two becomes zero, and switches to steady operation. The above conventional configuration requires a comparator to compare the synchronization signal with the signal of the induced voltage in the armature winding, and even if the system becomes very complex, the synchronization signal At the time of switching from operation to steady operation, the frequency of the synchronization signal increases, and the switching is performed in an unstable state, so smooth switching was not possible.In other words, position detection rotation control device 5
The rotation control signal is disturbed, and the magnet rotor 4 stops rotating, resulting in so-called step-out, and the brushless motor cannot operate. If it goes out of step further, the brushless motor may generate abnormal vibrations or noise, and a large current may flow through the switching element group 1, damaging the switching element group 1 or damaging the power supply device that supplies power to the switching element group 1. In order to solve these problems, the present invention has a three-layer starting operation control, and fixes the signal frequency to the switching element group to control the starting operation. In addition, the present invention has a three-stage starting operation control, and fixes the applied voltage of the switching element group to perform starting operation control. It is used to switch sequentially to ensure smooth startup and to switch between steady-state operations. In addition, the present invention has a three-stage startup operation control, and sequentially switches the startup operation control by manipulating the signal frequency to the switching element group and the voltage applied to the switching element group 1 to perform steady operation for smooth startup. According to the present invention 1, a device that performs switching operates synchronously for a certain period of time at a low constant first voltage as a first startup operation.As a second startup operation, the voltage is gradually increased at a voltage higher than the first voltage of the first startup operation. Sumo synchronized operation while increasing up to two voltages, and then as a third startup operation,
The magnet rotor may be started by performing synchronous operation for a certain period of time with a second voltage, and after stable synchronous operation, the voltage signal generated from the armature winding is input to the switching element group to cause steady rotation. (As the first start-up operation, synchronous operation is performed at a constant low first frequency for a certain period of time. As the second operation, the frequency is gradually increased to a second frequency higher than the first frequency of the first start-up operation, and the synchronous operation is continued.
Then, as a third start-up operation, the magnet rotor is started by synchronous operation at the second frequency for a certain period of time, and after stable synchronous operation, the voltage signal generated from the armature winding is input to the switching element group, and the rotor is rotated steadily. In addition, according to the present invention, as a first starting operation, synchronous rotation is performed for a certain period of time at a low constant first voltage and a low constant first frequency.As a second starting operation, the voltage and frequency are gradually changed to the first starting operation. The second voltage ratio is higher than the first voltage, and the synchronous operation is performed while increasing to the second frequency, which is higher than the first frequency.Then, as the third startup operation, the synchronous operation is performed for a certain period of time at the second voltage and second frequency. Embodiment No. 11 fl. FIG. DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a configuration diagram of the present invention.

In the figure, 1 is a switching element bead, 2 is a brushless motor, 3 is an armature winding turtle, 4 is a magnet rotor, and 5 is a position detection rotation control device [6 is a starting control device. This is a time chart showing the first embodiment of the present invention. In FIG. 1, as a first start control, the start control device 6 synchronizes with the position detection rotation control device 5 at a low constant first voltage fl. At this time, the synchronous voltage of the magnet rotor 4 is low, so no matter how large the moment of inertia is, the initial rotation of the magnet rotor 4 is more reliable by continuing this first startup control for a certain period of time. The first activation control will be explained with reference to FIG.

In the figure, the horizontal axis shows the time delay, the vertical axis shows the starting signal, the frequency of the synchronizing signal input from the position detection rotation control device 5 to the switching element group 1, and the voltage applied to the switching element group 1, respectively. Assume that a start signal is issued at time T1. Then, the first voltage vl is applied from the position detection rotation control device 5 to the switching element group 1.
Even if the magnet rotor 4 starts rotating in response to the rotating magnetic field created by the armature winding 3 at the starting voltage of the first voltage Vl, it is ensured by continuing the synchronous operation at the first voltage Vl until time T2. Even if the initial rotation of the armature winding 3 can be obtained, as a second start control, the start control device 6 sends the position detection rotation control device 5 a synchronized voltage that sequentially increases the voltage from the first voltage Vl to the second voltage V2. Magnet rotor 4 that commands operation
is accelerated and the rotational speed increases in response to an increase in voltage during synchronous operation. The time period from time T2 to time T3 in FIG. Since the frequency of the synchronous operation and the voltage applied to the switching element group l are fixed, the magnet rotor 4 rotates stably.During stable operation of the magnet rotor 4, as shown in FIG. By inputting the voltage signal generated from the armature winding 3 to the switching element group 1 at time T4 and switching the operation to steady rotation, the magnet rotor 4 can be easily switched to steady rotation. It is possible to quickly shift to rotational speed control or output control that increases the voltage applied to the switching element group 1. Next, the configuration of the power exchanger circuit to be described for the second embodiment of the present invention is the same as that shown in FIG. 1, so a description thereof will be omitted. The first starting control will be explained below with reference to FIG. 3. In FIG. If the start signal is issued at time T1, the first frequency is transmitted from the position detection rotation control device 5 to the switching element group 1. A synchronizing signal of fl is generated, and the magnet rotor 4 starts rotating in response to the rotating magnetic field created by the armature winding 3 with the synchronizing signal of the first frequency fl.
By continuing until then, the initial rotation of the armature winding 3 can be reliably obtained. Next, as a second start control, the start control device 6 instructs the position detection rotation control device 5 to perform synchronous operation in which the frequency is increased sequentially from the first frequency fl to the second frequency f2. Corresponding to the increase, it is accelerated and the number of revolutions increases. From time T2 to time T in Figure 2
Then, in the third start control, the start control device 6 instructs synchronous operation at the second frequency f2 for a certain period of time, and temporarily at the second frequency f2, the magnet rotor 4 rotates at a constant speed at tT mode.
Since the frequency of synchronous operation and the voltage applied to the switching element group 1 are fixed, the magnet rotor 4 rotates stably.The voltage generated from the armature winding 3 during stable operation of the magnet rotor 4 The magnet rotor 4 can be easily operated stably by inputting a signal to the switching element group 1 to switch to steady operation, and after that, the rotation speed can be controlled to increase the voltage applied to the switching element group 1 or Next, a third embodiment of the present invention will be described.The circuit configuration of the embodiment shown in FIG. 2 is the same as that of FIG. 1, so a description thereof will be omitted. The first starting control will be explained below with reference to FIG. 4. In FIG. It is assumed that the activation signal is issued at time T1, even though the frequency of the synchronizing signal to be generated and the voltage applied to the switching element group l are shown respectively. Then, the position detection rotation control device 5
, a first voltage vl and a first frequency fl are applied to the switching element group 1, and the magnet rotor 4 is activated by the armature winding 3 at the starting voltage of the first voltage vl and the first frequency fl. It begins to rotate in response to the rotating magnetic field applied to it. By continuing this synchronous operation at the first voltage (1) and the first frequency fl until time T2, the initial rotation of the armature winding 3 can be reliably obtained. Next, as a second activation control, the activation control device 6 applies the first voltage ■1 to the position detection rotation control device 5,
A synchronous operation is instructed in which the voltage and frequency are sequentially increased from the first frequency fl to the second voltage v2. The magnet rotor 4 is accelerated and increases the number of revolutions in response to the increase in the voltage and frequency of the synchronous operation. This applies from time T2 to time T3 in FIG.
Synchronous operation is instructed for a certain period of time at the second frequency f2, and the magnet rotor 4 temporarily rotates at a constant speed at the second voltage v2 and the second frequency f2. Since the frequency of the synchronous operation and the voltage and frequency applied to the switching element group 1 are fixed, the magnet rotor 4 rotates stably. At time T4, the voltage signal generated from the armature winding 3 is input to the switching element group 1, and the magnet rotor 4 can be easily switched to steady rotation operation. Effects of the Invention As is clear from the above explanation, the three-phase connected armature winding of the present invention, 6 It has a switching element group formed by connecting three semiconductor switching elements with control electrodes in a three-phase bridge, and a magnet rotor, and controls the switching element group by detecting a voltage signal generated from the armature winding. In the brushless motor that rotates the magnet rotor,
A signal of a certain fixed frequency and number that causes the armature winding to generate a rotating magnetic field is input to the switching element group at startup, and a low constant first voltage is input to the switching element group for a certain period of time. The voltage is gradually increased to a second voltage higher than the first voltage, and the second voltage is input for a certain period of time to start the magnet rotor, and then a voltage signal generated from the armature winding is input to the switching element group. A drive device for a brushless motor that rotates steadily has the advantage of not only being able to start the brushless motor reliably and quickly accelerating to the required rotation speed, but also being easily and inexpensively realized without the need for a complicated circuit. It is something that you have. Further, the three-phase connected armature winding of the present invention,
It has a switching element group formed by connecting six semiconductor switching elements with control electrodes in a three-phase bridge, and a magnet rotor, and controls the switching element group by detecting a voltage signal generated from the armature winding. In a brushless motor that rotates the magnet rotor, the voltage applied to the switching element group at startup is fixed, and a low constant voltage is applied to the switching element group to cause the armature winding to generate a rotating magnetic field. After inputting the first frequency for a certain period of time,
The frequency of the signal is gradually increased to a second frequency higher than the first frequency, and after starting the magnet rotor by inputting the second frequency for a certain period of time, the voltage signal generated from the armature winding is applied to the switching element group. A brushless motor drive device that receives input and rotates steadily has the advantage of being able to start the brushless motor reliably, quickly accelerating to the required rotation speed, and being easily and inexpensively realized without the need for a complex circuit. The present invention also includes a three-phase connected armature winding, a switching element group formed by three-phase bridge connection of six semiconductor switching elements with control electrodes, and a magnet rotor. In a brushless motor that detects a voltage signal generated from the armature winding and controls the switching element group to rotate the magnet rotor, the armature winding causes the switching element group to generate a rotating magnetic field at the time of startup. After inputting a signal with a fixed first frequency that generates a signal and operating for a certain period of time with a fixed first voltage applied to the switching element group, the voltage and frequency are gradually increased to a first frequency higher than the first voltage. Two voltages increase to a second frequency higher than the first frequency.
According to a brushless motor drive device that operates at a second frequency for a certain period of time and starts the magnet rotor, a voltage signal generated from the armature winding is input to the switching element group to steadily rotate the brushless motor. It has the advantage of being able to quickly accelerate to the required number of revolutions, and also to be easily and inexpensively realized without the need for complex circuits.

[Brief explanation of drawings]

FIG. 1 shows the configuration diagram of the first to third embodiments of the present invention.
y) The time chart of the first embodiment of the present invention, FIG. 3 is the time chart of the second embodiment of the present invention, FIG. 4 is the time chart of the third embodiment of the present invention, and FIG. 5 is the conventional one. In the example constituent countries ■...Switching element method 2...
... Brushless motor 3... Armature winding 4...
... Magnet rotor, 5... Position detection rotation control device 6.
・・・Start control device

Claims (3)

[Claims] (1) It has an armature winding connected in three phases, a switching element group formed by connecting six semiconductor switching elements with control electrodes in a three-phase bridge, and a magnet rotor, and the armature winding In a brushless motor that rotates the magnetic rotor by detecting a voltage signal generated by After inputting a signal and applying a low constant first voltage to the switching element group for a certain period of time, the voltage is gradually increased to a second voltage higher than the first voltage, and the second voltage is applied for a certain period of time. A brushless motor driving device that inputs a voltage signal generated from the armature winding to the switching element group after starting the magnet rotor to cause steady rotation. (2) A three-phase connected armature winding, a switching element group formed by three-phase bridge connection of six semiconductor switching elements with control electrodes, and a magnet rotor, In a brushless motor that detects a generated voltage signal and controls the switching element group to rotate the magnet rotor, the voltage applied to the switching element group at startup is fixed, and the switching element group is connected to the armature winding. After inputting a signal in which the wire generates a rotating magnetic field at a low constant first frequency for a certain period of time, the frequency of the signal is gradually increased to a second frequency higher than the first frequency,
A brushless motor driving device which inputs a second frequency for a certain period of time to start the magnet rotor, and then inputs a voltage signal generated from the armature winding to the switching element group to rotate the brushless motor normally. (3) It has an armature winding connected in three phases, a switching element group formed by connecting six semiconductor switching elements with control electrodes in a three-phase bridge, and a magnet rotor, and the armature winding In a brushless motor that detects a voltage signal generated by a magnet rotor and controls the switching element group to rotate the magnet rotor, the armature winding generates a rotating magnetic field in the switching element group at startup. After inputting a frequency signal and operating for a certain period of time with a fixed first voltage applied to the switching element group,
The voltage and the frequency were gradually increased to a second voltage higher than the first voltage and a second frequency higher than the first frequency, and the magnetic rotor was started by operating at the second frequency and the second voltage for a certain period of time. A drive device for a brushless motor that subsequently inputs a voltage signal generated from the armature winding to the switching element group and causes steady rotation.