JP2003153580A - Lock signal-output circuit of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock signal detecting apparatus of a motor that can detect locking of the rotor of the motor by a circuit of simple configuration. SOLUTION: The lock signal output circuit of motors has a fan motor circuit 4 that has a driver IC1 and a motor rotation detecting component 2, outputs the rotation signal of pulses, when the motor is rotated, and outputs a fixed voltage lock signal when the rotor is locked, and a rotation signal/lock signal detecting circuit 5 for applying the signal output of the fan motor circuit 4. The rotation signal/lock signal detecting circuit 5 comprises a capacitor C1 that serves as a signal input side, a grounded resistor R3 in series with the capacitor C1, and a FET 6 for connecting the connection point between the capacitor C1 and the resistor R3 to a gate terminal, thus surely identifying the rotation signal that is a pulse signal from a fixed voltage lock signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor lock signal output circuit that enables a controller (system side) to detect lock when a motor such as a cooling fan locks.

[0002]

[Prior Art] Generally, a personal computer or car navigation,
Other electronic devices are equipped with a cooling fan for suppressing a temperature rise of electronic parts such as a CPU. This cooling fan is often installed so as to appear on the airframe.In such a case, foreign matter may enter the motor part of the cooling fan from the outside and the rotor of the motor may lock, cooling the electronic parts of the equipment. However, there is a problem in that the electronic component does not operate normally due to the failure of operation, or the electronic component is thermally destroyed.

Therefore, the equipment is provided with a motor lock safety means such as detecting the lock of the rotor in the motor and automatically turning off the power of the motor or operating the safety control circuit on the system side. Has been done.

Conventionally, as the motor lock safety means, for example, as shown in a schematic circuit diagram of a conventional motor lock signal output circuit of FIG. 5, a motor driver IC 1 and a rotor such as a Hall effect element for detecting rotation of the motor. A rotation pulse signal (for example, 2 pulses / 1 rotation FG signal) proportional to the number of rotations when the motor rotates using the position detection component 2.
To output a constant voltage when the motor is locked,
The system can detect the lock of the motor. In addition, 3 in the figure is a motor winding. Also,
Although not shown, there is also a driver IC in which a dedicated circuit for detecting the lock of the motor is incorporated and the driver IC itself outputs a lock signal when the motor is locked.

[0005]

By the way, in the safety means for outputting a rotation pulse signal and a constant voltage according to the rotation and lock of the motor and detecting this by the system side, when the motor locks, High voltage or Lo depending on the positional relationship between the detection component 2 and the magnetic pole of the rotor
Although it becomes a constant voltage of w voltage, it is difficult to use it as a lock detection on the system side because it is not decided which voltage it becomes. In addition, the driver IC itself outputs a lock signal when the motor is locked, and the safety means for detecting this on the system side requires a dedicated motor driver IC, resulting in high cost and few ICs that can be selected. .

The present invention solves the above conventional problems and provides a motor lock signal detection circuit capable of outputting a motor lock with a simple circuit configuration when the rotor of the motor is locked, regardless of the position of the rotor. With the goal.

[0007]

In order to achieve the above object, the present invention provides a capacitor on the signal input side, a resistor in series with the capacitor and grounded, and a connection point of the capacitor and the resistor. The motor lock signal output circuit is provided with a rotation signal / lock signal output circuit composed of a switching element connected to the input terminal, and the system can easily detect the lock when the motor rotor is locked.

According to the present invention, a circuit having a simple structure using a capacitor and a resistor and a switching element or a capacitor, a diode and a switching element can reliably identify a rotation signal which is a pulse signal and a lock signal which is a constant voltage. Can be output.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention has a motor driving driver IC and a rotor position detecting component, outputs a pulse rotation signal when the rotor rotates, and outputs a constant voltage when the rotor is locked. In a motor having a motor drive circuit for outputting a lock signal of, and a motor winding having one or more phases for rotating a rotor, a capacitor connected to one phase of the motor winding, and the capacitor in series, A lock signal output circuit for a motor, characterized in that the resistor is connected to the ground on the circuit and a switching element in which the connection point of the capacitor and the resistor is connected to its input terminal. It has an effect of surely identifying and outputting the rotation signal which is a pulse signal and the lock signal which is a constant voltage according to the time of rotation and the time of lock.

The invention according to claim 2 of the present invention has a driver IC for driving a motor and a rotor position detecting component, outputs a pulse rotation signal when the rotor rotates, and outputs a lock signal of a constant voltage when the rotor is locked. In a motor having a motor drive circuit for outputting and a motor winding for rotating a rotor in one or more phases, a capacitor connected to one phase of the motor winding, in series with the capacitor, and on a circuit. Is a lock signal output circuit of a motor, characterized in that it is constituted by a diode connected to the ground of, and a switching element in which a connection point of the capacitor and the diode is connected to its input terminal. It has the function of reliably identifying and outputting the rotation signal, which is a pulse signal, and the lock signal, which is a constant voltage, according to the lock time. .

Further, the invention described in claim 3 or 4 of the present invention, in addition to the invention of the lock signal detection circuit for a motor according to claim 1 or 2, has a structure in which a resistance is provided in an input portion of a switching element. Thus, the current flowing to the input of the switching element can be limited, and the switching speed can be adjusted.

Further, the invention according to claim 5 of the present invention is
In the lock signal detection circuit for a motor according to any one of claims 1 to 4, the switching element is composed of a field effect transistor (hereinafter referred to as FET), and is a pulse signal depending on whether the motor rotates or locks. The rotation signal and the lock signal which is a constant voltage are surely identified and output, and the High voltage of the input voltage to the FET becomes a high High voltage at the time of rotation.
Does not need to be driven at a low voltage, and therefore has the effect that a low cost FET can be used.

According to a sixth aspect of the present invention, in the lock signal detecting device for a motor according to any one of the first to fifth aspects, the motor is a cooling fan motor. CP for car navigator equipment
It has the effect that it is also effective when incorporated into a U cooling device.

(Embodiment 1) FIG. 1 is a circuit diagram of a lock signal output circuit for a motor according to Embodiment 1 of the present invention, FIG.
[Fig. 3] is a voltage waveform diagram of each part in the lock signal detection device of the motor. In these drawings, the same components as those of the conventional technique are designated by the same reference numerals as those of the conventional technique.

As shown in FIG. 1, the motor lock signal output circuit according to the first embodiment includes a rotation detection component 2 such as a Hall effect element for detecting a rotor position of a motor in a fan motor circuit 4, and a rotation detection component. A driver I that commutates (switches) the motor winding 3 in synchronization with the signal from the detection component 2.
C1 and a rotation signal / lock signal output circuit 5 for receiving a signal from the motor. This rotation signal
The lock signal output circuit 5 includes a capacitor C ₁ on the signal input side, a resistor R ₃ connected in series with the capacitor C ₁ and to the ground on the circuit, and a connection between the capacitor C ₁ and the resistor R ₃ . It is composed of a FET 6 which is a switching element in which the point (B) is connected to the input terminal. The capacitor C ₁ and the resistor R _{3 form} a differentiating circuit.
In the figure, R ₁ and R ₂ are current limiting resistors of the rotor position detecting component 2 including Hall effect elements, and R ₄ is a pull-up resistor.

In the above structure, a rotation pulse signal (for example, 2 pulses / 1 rotation FG signal) proportional to the rotation speed of the rotor is output when the motor rotates, and when the motor is locked, regardless of the position of the magnetic pole of the rotor, A constant voltage is output and the lock of the motor can be detected on the system side.

The circuit operation will be described in detail with reference to the voltage waveform diagram of each part in the lock signal output circuit for a motor according to the first embodiment of the present invention shown in FIG. 2), a switching voltage waveform of the motor winding 3 from the driver IC 1 appears as shown in FIG. However, since there is a voltage loss in the driver IC1, Low is higher than GND and High is V
It is slightly lower than cc1.

Similarly, when the motor rotates, the capacitor C ₁
At the connection point (B) between the resistor R ₃ and the resistor R ₃ , the voltage waveform at the point (A) is differentiated by the differentiating circuit of the capacitor C ₁ and the resistor R ₃ (see FIG.
The voltage waveform is as shown in (b).

Vcc1 is the power supply voltage of the motor, and here it is assumed that the motor is driven at 5.0 V assuming a cooling fan motor.

The FET 6 is driven at a low voltage with a gate ON voltage of about 1.0 V. By using such an FET, a voltage waveform such as point (B) is sufficiently F.
ET6 can be turned on. This makes FET6
The voltage waveform at point (C) on the output side of is as shown in FIG.

Next, when the motor is locked, the voltage at point (B) is dropped by the resistor R ₃ to the GND level,
FET6 remains off. As a result, point (C) becomes High fixed output as shown in (d) of FIG.

In this way, it is possible to output the pulse signal output and the High fixed output when the motor is rotating and when the motor is locked. Although the switching element is a voltage drive type and uses an FET that turns on even at a low voltage, it may be a current drive type transistor. Further, in the first embodiment, when locked, it outputs as a High fixed output, but it may be provided with an inverting circuit to provide a Low fixed output.

(Second Embodiment) FIG. 3 is a circuit diagram of a lock signal output circuit for a motor according to a second embodiment of the present invention, FIG.
FIG. 7 is a voltage waveform diagram of each part in the lock signal output circuit of the motor according to the second embodiment of the present invention. In these figures, the same components as those in FIG. 1 are designated by the same reference numerals.

As shown in FIG. 3, the motor lock signal output circuit according to the second embodiment includes a rotor position detecting component 2 such as a Hall effect element for detecting the position of the rotor of the motor in a fan motor circuit 4. A driver IC 1 for commutating (switching) the motor winding 3 in synchronization with a signal from the rotation detecting component 2 is provided, and a rotation signal / lock signal output circuit 5 for receiving a signal from the motor is further provided. The rotation signal / lock signal output circuit 5 includes a capacitor C ₁ on the signal input side, a diode D _{1 in} series with the capacitor C ₁ and connected to the ground on the circuit, the capacitor C ₁ and a diode. It is composed of the FET _{6 in which} the connection point (B) of D ₁ is connected to the input terminal. That is,
In the second embodiment, the resistor R ₃ in the rotation signal / lock signal output circuit 5 in the first embodiment is replaced with the diode D ₁ .

In the above structure, when the motor is rotating, a rotation pulse signal (for example, 2 pulses / 1 rotation FG signal) proportional to the rotation speed of the rotor is output, and when the motor is locked, regardless of the position of the magnetic pole of the rotor, A constant voltage is output and the lock of the motor can be detected on the system side.

The circuit operation will be described in detail with reference to FIG. 4. When the motor is rotating, the motor winding from the driver IC 1 is provided at point (A) on the signal output side of the motor as shown in FIG. The switching voltage waveform of 3 appears. However, because there is a voltage loss in the driver IC1, Low is GN
Higher than D, High is slightly lower than Vcc1.

Similarly, when the motor rotates, the capacitor C ₁
And the diode D ₁ pass only the AC component of the voltage waveform at point (A). The connection point (B) between the capacitor C ₁ and the diode D ₁ has a voltage waveform as shown in FIG. However, the low voltage is GND due to the diode D _1.
It is fixed at a voltage about 0.7V lower than the level. Also,
Since the amplitude of the voltage waveform at point (B) is the same as that in the case of the first embodiment, the High voltage becomes higher than that in the case of the first embodiment.

Here, the FET6 is turned on by the voltage at the point (B).
However, the voltage waveform at point (C) on the output side of the FET 6 is as shown in FIG.

Next, when the motor is locked, the voltage at point (B) is dropped to the GND level by the diode D ₁ and the FET 6 remains off. As a result, point (C) becomes High fixed output as shown in (d) of FIG.

In this way, the rotation and lock of the motor can be detected as the pulse signal output and the High fixed output. In the second embodiment, since the High voltage is high as described above, the FET does not have to be driven by a low voltage, and therefore the cost of the FET can be reduced.

The switching element is a voltage drive type,
Moreover, although a FET that turns on even at a low voltage is used, a current drive type transistor may be used. In the second embodiment, when locked, it is detected as a high fixed output, but this may be further provided with an inverting circuit to be a low fixed output.

In the first and second embodiments, the single-phase full-wave drive type motor is used as an example. Any driving method can be used. Further, the switching waveform of the motor winding may be shaped by using an inverter or the like, and the capacitor may be connected not to the motor winding but to the circuit after the waveform shaping.

[0033]

As is apparent from the above description, the present invention has a motor driving driver IC and a rotor position detecting component, outputs a pulse rotation signal when the rotor rotates, and locks a constant voltage when the rotor is locked. In a motor having a motor drive circuit that outputs a signal and a motor winding for rotating a rotor in one or more phases, a capacitor connected to one phase of the motor winding, and a capacitor in series and on the circuit. When the motor is rotating, the lock signal output circuit of the motor is constituted by a resistor connected to the ground of the above, and a switching element in which the connection point of the capacitor and the resistor is connected to its input terminal. Depending on the time of lock, the pulse signal is a rotation signal and H is constant.
The lock signal, which is the high voltage, can be surely identified and output by a simple circuit, and the driver IC can also have a simple configuration, resulting in little loss of IC and not impairing motor characteristics. The lock signal output circuit has an effect that it can be easily used because of its circuit configuration.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a lock signal output circuit for a motor according to a first embodiment of the present invention.

FIG. 2 is a voltage waveform diagram of each part in the lock signal output circuit of the motor according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram of a lock signal output circuit for a motor according to a second embodiment of the present invention.

FIG. 4 is a voltage waveform diagram of each part in the motor lock signal output circuit according to the second embodiment of the present invention.

FIG. 5 is a schematic circuit diagram of a conventional motor lock signal output circuit.

[Explanation of symbols]

1 Driver IC 2 Rotation Detection Component 3 Motor Winding 4 Fan Motor Circuit 5 Rotation Signal / Lock Signal Output Circuit 6 FET C ₁ Capacitor R ₁ Current Limiting Resistor R ₂ Current Limiting Resistor R ₃ Resistor R ₄ Pullup Resistor D ₁ Diode

Claims (6)

[Claims] 1. A motor drive circuit having a motor drive driver IC and a rotor position detection component, which outputs a pulse rotation signal when the rotor rotates and a lock signal of a constant voltage when the rotor locks, and a rotor. A motor having one or more phases of motor windings for causing a capacitor connected to one phase of the motor winding, a resistor connected in series with the capacitor and to ground on a circuit, A lock signal output circuit for a motor, comprising a switching element in which a connection point of a capacitor and the resistor is connected to its input terminal. 2. A motor drive circuit having a motor drive driver IC and a rotor position detection component, which outputs a pulse rotation signal when the rotor rotates and outputs a lock signal of a constant voltage when the rotor locks, and the rotor is rotated. A motor having one or more phases of motor windings for allowing a capacitor connected to one phase of the motor winding, a diode connected in series with the capacitor and connected to ground on the circuit, A lock signal output circuit for a motor comprising a switching element in which a connection point between a capacitor and the diode is connected to its input terminal. 3. A motor drive circuit which has a motor drive driver IC and a rotor position detection component, outputs a pulse rotation signal when the rotor rotates and outputs a lock signal of a constant voltage when the rotor locks, and rotates the rotor. A motor having one or more phases of motor windings for causing a capacitor connected to one phase of the motor winding, a resistor connected in series with the capacitor and to ground on a circuit, A lock signal output circuit for a motor, comprising a switching element in which a connection point between the capacitor and the resistor is connected to an input terminal thereof via a resistor. 4. A motor drive circuit having a motor drive driver IC and a rotor position detecting component, which outputs a pulse rotation signal when the rotor rotates and outputs a lock signal of a constant voltage when the rotor locks, and the rotor is rotated. A motor having one or more phases of motor windings for allowing a capacitor connected to one phase of the motor winding, a diode connected in series with the capacitor and connected to ground on the circuit, A lock signal output circuit for a motor, comprising a switching element in which a connection point between a capacitor and the diode is connected to its input terminal via a resistor. 5. The switching element is composed of a field effect transistor.
The lock signal output circuit of the described motor. 6. The motor lock signal output circuit according to claim 1, wherein the motor is a cooling fan motor.