JPH07298659A - Starting and control device for dc shunt motor - Google Patents

Abstract

PURPOSE:To cope with low response and variations in supply voltage and the surrounding temperature of a motor while avoiding the short-circuit and overcurrent, by providing a delay time correcting means that shortens the delay time more for higher supply voltage and lengthens the delay time more for lower supply voltage. CONSTITUTION:A starting and control device 5, a delay time correcting means, for a d.c. shunt motor 4, produces armature current starting signal output to start the motor when a delay time, preset based on supply voltage and motor temperature, has passed after the start of output of field driving signal. This energizes the armature 2 after a magnetic field is generated in the field coil 3, which prevents the occurrence of short circuits or overcurrent. When supply voltage is sufficient or motor temperature is low, the delay time is minimized. This enables the improvement of the starting response of the motor 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting control device for a DC shunt winding motor used in, for example, an electric vehicle.

[0002]

2. Description of the Related Art Generally, when a field current (field winding current) and an armature current (armature winding current) are simultaneously output at the time of starting a DC shunt motor, the start-up of the field current at start-up is the armature current. If it is delayed from the rising edge of, the circuit that outputs the armature current will be short-circuited, or an overcurrent will flow to the circuit.

Therefore, in order to avoid the problems of short circuit and overcurrent in the armature circuit, for example, the actual open circuit 59-50.
As disclosed in Japanese Patent No. 592, there is a device in which the output of the armature current is delayed from the output of the field current. With this configuration, the field current rises, and after the magnetic field on the side of the field winding is stabilized, the armature current flows, so that the above-mentioned problem can be prevented.

[0004]

However, in the case of the above-mentioned conventional method, since the delay time is a predetermined fixed time, the low responsiveness becomes a problem depending on its application, or the power supply and the voltage are low. However, there is a problem that it is not possible to cope with changes in the motor atmosphere and temperature.

The present invention has been made in view of the above-mentioned problems of the prior art. While avoiding the problems of circuit short-circuiting and overcurrent, it is possible to cope with low responsiveness, changes in power supply voltage and motor ambient temperature. An object of the present invention is to provide a start-up control device for a DC shunt winding motor that can be used.

[0006]

According to a first aspect of the present invention, a field current starting signal is output in synchronization with a motor starting signal, and an armature current starting signal is output after a predetermined delay time has passed. The winding motor start-up control device is characterized by including a delay time correction unit that shortens the delay time as the power supply voltage becomes higher and extends it as the power supply voltage becomes lower.

According to a second aspect of the present invention, a start control device for a DC shunt winding motor, which outputs a field current start signal in synchronization with a motor start signal and outputs an armature current start signal after a predetermined delay time has elapsed. In the above, the delay time correction means is provided to shorten the delay time as the motor temperature becomes lower and extend it as the motor temperature becomes higher.

[0008]

According to the starting control device for a shunt winding motor of the first aspect of the invention, when the armature current starting signal is delayed from the field current starting signal, this delay time is shortened as the power supply voltage increases. If the power supply voltage is sufficient, the starting response of the motor can be improved, and the lower the power supply voltage, the longer it extends.Therefore, in this case as well, the magnetic field on the field winding side should stabilize before the armature side is energized. Therefore, it is possible to prevent a short circuit and an overcurrent problem.

According to the start control device for a shunt winding motor according to the second aspect of the present invention, the delay time is shortened as the motor temperature is lower, so that the start response can be improved when the motor temperature is low. Since the higher the temperature is, the longer the temperature is extended. Therefore, even in such a case, short circuit and overcurrent can be prevented.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5 are diagrams for explaining a start control device for a DC shunt winding motor according to an embodiment of the invention of claims 1 and 2, and FIG. 1 is a circuit configuration diagram of the device of the present embodiment, and FIG.
Is a flow chart for explaining a method of starting the device of the present embodiment,
3 is a characteristic diagram showing the relationship between the motor temperature and the delay period, FIG. 4 is a characteristic diagram showing the relationship between the motor voltage and the delay period, and FIG.
FIG. 4 is a chart diagram of a signal state at the time of starting the device of this embodiment.

In these drawings, 1 is a drive circuit for driving a DC shunt winding motor 4 in which an armature coil 2 and a field coil 3 are connected in parallel, and 5 controls the drive circuit 1. The controller.

The drive circuit 1 includes a main battery 6 and
A main switch 7, an armature control transistor 8 that controls the supply of the current of the main battery 6 to the armature coil 2, and a field control that controls the supply of the current of the main battery 6 to the field coil 3. Transistor 9 for use. Further, the armature commutation diode 10, the field coil commutation diode 11 for commutating the current when the transistors 8 and 9 for armature control and field control are turned off, and the large current to the armature 2. And a reactor 12 that prevents damage to the circuit when the current flows.

The controller 5 includes a main battery voltmeter 13 for detecting the voltage of the main battery 6, a motor temperature sensor 14 for detecting the temperature of the motor 4, and
An input interface 17 is connected to a throttle sensor 15 that detects a throttle opening degree that operates in conjunction with an accelerator pedal of an electric vehicle (not shown). Then, a CPU 18 that performs arithmetic processing based on a signal input to the input interface 17, and a ROM 19 and a RAM 2 that store programs, data, etc. for the arithmetic processing.
0 and an output interface 21 for outputting the result of the arithmetic processing as a control signal to each of the armature controlling and field controlling transistors 8 and 9.

Next, the starting control of the motor 4 of the apparatus of this embodiment will be described. The following activation control process is performed in the controller 5. First, the controller 5 is provided with a battery voltage signal 13 read by the main battery voltmeter 13 and the motor temperature sensor 14.
a and the motor temperature signal 14a are input (steps S1 and S2).

Next, when the slot opening signal (motor starting signal) 15a is input from the throttle sensor 15 (step S3), the basic delay time of the armature current starting signal is corrected according to the battery voltage and the motor temperature. Voltage correction coefficient (FBA) and temperature correction coefficient (FTH
M) is calculated (steps S3 to S5), and the basic delay time (KT) stored in the controller 5 is corrected based on the above equation (1) by both correction coefficients, thereby delay time (KTDL). Is calculated (step S
4 to S6). KTDL = KT × FBA × FTHM (1)

Then, a control pulse for turning on the field control transistor 9 is output, and when the delay time KTDL has elapsed from the start of output of the control pulse, a control pulse for turning on the armature control transistor 8 is output. The shunt winding motor 4 is activated (steps S7 to S9).

Here, the voltage correction coefficient (FBA) is
As shown in FIG. 3, the higher the voltage applied to the motor (power supply voltage), the shorter the basic delay time (KT) is set, and the lower it is set to extend the temperature correction coefficient (FTHM). As shown in FIG. 4, the basic delay time (KT) is set shorter as the motor temperature is lower, and is set longer as the motor temperature is higher.

DC shunt winding motor 4 constructed as described above
Then, as shown in FIG. 5, when the motor start signal 15a is output, that is, when the accelerator is stepped on, the field current drive pulse is started to be output, and the above-mentioned correction is made according to the power supply voltage and the motor temperature. Delay time (KTDL)
The output of the armature current drive pulse starts when
As a result, the motor 4 is started.

As described above, in the DC shunt winding motor start-up control device according to the above-described embodiment, after the output of the field drive signal, the delay time (KTDL) set based on the power supply voltage and the motor temperature elapses. Since the armature current drive signal is output and activated, the magnetic field is generated on the side of the field coil 3 and then the armature 2 is energized to prevent a short circuit or overcurrent from occurring in the circuit. it can. On the other hand, when the power supply voltage is sufficient or the motor temperature is low, the delay time is minimized, so that the starting response of the motor can be improved.

As a method of starting the motor 4 in the above embodiment, as shown in FIG. 6, the field current drive is performed until the delay output time (KTDL) elapses after the motor start signal is input. The signal may be continuously output, and then the field and armature current drive pulses may be output to start the motor 4. in this case,
Since the field current drive signal is not an intermittent pulse but is output continuously for a certain period of time, the magnetic field on the side of the field coil 3 can be generated rapidly, stably and surely.

[0021]

As described above, according to the starting control device for a shunt winding motor according to the invention of claim 1, the delay time is shortened as the power supply voltage is higher and extended as the power supply voltage is lower. This has the effect of preventing the generation of current and being able to cope with changes in the power supply voltage.

According to the shunt motor start-up control device of the second aspect of the invention, the delay time is shortened as the motor temperature is lower and is extended as the motor temperature is higher, so that it is possible to prevent the occurrence of short circuit and overcurrent. At the same time, there is an effect that it is possible to cope with changes in the motor temperature.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a startup control device for a DC shunt winding motor according to an embodiment of the present invention.

FIG. 2 is a flow chart for explaining a method of starting the apparatus of the above embodiment.

FIG. 3 is a characteristic diagram showing a relationship between a motor applied voltage and a delay time correction coefficient in the apparatus of the above embodiment.

FIG. 4 is a characteristic diagram showing a relationship between a motor temperature and a delay time correction coefficient of the apparatus of the above embodiment.

FIG. 5 is a chart showing a signal state at the time of starting the apparatus of the above-described embodiment.

FIG. 6 is a chart diagram of a modified example of a signal state when the apparatus of the above-described embodiment is activated.

[Explanation of symbols]

 4 DC shunt winding motor 5 Controller (start control device, delay time correction means) KTDL delay time

Continuation of front page (72) Minoru Yoshida Minato 2-1-1 Taoyuan, Ikeda City, Osaka Daihatsu Industry Co., Ltd.

Claims (2)

[Claims] 1. A start control device for a DC shunt winding motor, which outputs a field current start signal in synchronization with a motor start signal, and outputs an armature current start signal after a lapse of a predetermined delay time. Is provided with a delay time correction unit that shortens the higher the power supply voltage and extends the lower the power supply voltage, the start control device for the DC shunt motor. 2. A start control device for a DC shunt winding motor, which outputs a field current start signal in synchronism with a motor start signal and outputs an armature current start signal after a predetermined delay time elapses. A start control device for a DC shunt winding motor, comprising: a delay time correction unit that shortens the motor temperature as the motor temperature becomes lower and extends the motor temperature as the motor temperature increases.