Method for estimating service life of motor, motor control system, blower system, and multicopter system
A method for estimating a service life of a motor that is driven by variable duty cycle control. The method includes calculating an elapsed service life ratio representing a ratio of an elapsed service life to all service life according to the following formula to estimate the service life of the motor: L s = ∑ i ( t i L i × ( 1.5 ) m ) m = 40 - max ( 40 , K i ) 10 , where L s represents the elapsed service life ratio, t i represents a driving time in a section i, L i represents a service life expectancy at a duty cycle D i in the section i and at an environmental temperature of the motor being 40° C., and K i represents a temperature in the section i.
1. A method for estimating a service life of a motor that is driven by variable duty cycle control, the method comprising:
reading information about a duty cycle from a driving circuit and acquiring information about a temperature which is detected by a temperature sensor;
determining whether the duty cycle has changed from a last-time duty cycle;
determining whether the temperature has changed from a last-time temperature;
calculating an elapsed service life ratio representing a ratio of an elapsed service life to all service life according to the following formula to estimate the service life of the motor:
L
s
=
∑
i
(
t
i
L
i
×
(
1.5
)
m
)
m
=
40
-
max
(
40
,
K
i
)
10
,
wherein
L s represents the elapsed service life ratio,
t i represents a driving time in a section i, the section i being a temporal section used in the calculating and which corresponds to the last-time duty cycle, the last-time temperature, and a currently counted driving time,
L i represents a service life expectancy at a duty cycle D i in the section i and at an environmental temperature of the motor being 40° C., and
K i represents a temperature in the section i; and
outputting a signal which relates to the calculated elapsed service life ratio calculated by the calculating.
2. The method for estimating the service life of the motor according to claim 1 , wherein
a remaining service life of the motor is (1−L s ).
3. A motor control system comprising:
a motor that is driven by variable duty cycle control; and
control circuit that reads driving information of the motor, reads information about a duty cycle from a driving circuit, and acquires information about a temperature which is detected by a temperature sensor; wherein
the control circuitry determines whether the duty cycle has changed from a last-time duty cycle and determines whether the temperature has changed from a last-time temperature;
the control circuitry includes calculation circuitry that calculates an elapsed service life ratio representing a ratio of an elapsed service life to all service life of the motor according to the following formula:
L
s
=
∑
i
(
t
i
L
i
×
(
1.5
)
m
)
m
=
40
-
max
(
40
,
K
i
)
10
,
wherein
L s represents the elapsed service life ratio,
t i represents a driving time in a section i, the section i being a temporal section used in calculation by the calculation circuitry and which corresponds to the last-time duty cycle, the last-time temperature, and a currently counted driving time,
L i represents a service life expectancy at a duty cycle D i in the section i and at an environmental temperature of the motor being 40° C., and
K i represents a temperature in the section i; and
the control circuitry outputs a signal which relates to the calculated elapsed service life ratio calculated by the calculation circuitry.
4. The motor control system according to claim 3 , wherein
the control circuitry further includes signal output circuitry that outputs an alarm signal when the elapsed service life ratio calculated by the calculation circuitry is higher than or equal to a set value.
5. A blower system comprising:
the motor control system according to claim 3 ; and
a blower including
the motor, and
an impeller that is fixed on a rotating assembly of the motor and that includes a plurality of blades.
6. The blower system according to claim 5 , wherein
the temperature is any one of a temperature of an external apparatus that is cooled by the blower, an ambient temperature of the external apparatus, and an environmental temperature of the motor.
7. The blower system according to claim 5 , wherein
the control circuitry included in the motor control system increases or decreases a rotational speed of the motor when the temperature of an external apparatus that is cooled by the blower is increased or decreased.
8. A method for estimating a service life of a motor that is driven by variable duty cycle control, the method comprising:
reading information about a duty cycle from a driving circuit and acquiring information about a temperature which is detected by a temperature sensor;
determining whether the duty cycle has changed from a last-time duty cycle;
determining whether the temperature has changed from a last-time temperature;
calculating an elapsed service life ratio representing a ratio of an elapsed service life to all service life according to the following formula to estimate the service life of the motor:
L
s
=
∑
i
(
t
i
L
i
×
(
1.5
)
m
)
m
=
(
40
+
Δ
t
)
-
max
(
40
+
Δ
t
,
K
i
)
10
,
wherein
L s represents the elapsed service life ratio,
t i represents a driving time in a section i, the section i being a temporal section used in the calculating which corresponds to the last-time duty cycle, the last-time temperature, and a currently counted driving time,
L i represents a service life expectancy at a duty cycle D i in the section i and at an environmental temperature of the motor being 40° C.,
K i represents a temperature of the motor in the section i, and
Δt represents a temperature increase value of the motor at the duty cycle D i in the section i and at the environmental temperature of the motor being 40° C.; and
outputting a signal which relates to the calculated elapsed service life ratio calculated by the calculating.
9. A motor control system comprising:
a motor that is driven by variable duty cycle control; and
control circuitry that reads driving information of the motor, reads information about a duty cycle from a driving circuit, and acquires information about a temperature which is detected by a temperature sensor; wherein
the control circuitry determines whether the duty cycle has changed from a last-time duty cycle and determines whether the temperature has changed from a last-time temperature;
the control circuitry includes calculation circuitry that calculates an elapsed service life ratio representing a ratio of an elapsed service life to all service life of the motor according to the following formula:
L
s
=
∑
i
(
t
i
L
i
×
(
1.5
)
m
)
m
=
(
40
+
Δ
t
)
-
max
(
40
+
Δ
t
,
K
i
)
10
,
wherein
L s represents the elapsed service life ratio,
t i represents a driving time in a section i, the section i being a temporal section used in calculation by the calculation circuitry and which corresponds to the last-time duty cycle, the last-time temperature, and a currently counted driving time,
L i represents a service life expectancy at a duty cycle D i in the section i and at an environmental temperature of the motor being 40° C.,
K i represents a temperature of the motor in the section i, and
Δt represents a temperature increase value of the motor at the duty cycle D i in the section i and at the environmental temperature of the motor being 40° C.; and
the control circuitry outputs a signal which relates to the calculated elapsed service life ratio calculated by the calculation circuitry.
10. A multi-copter system comprising:
the motor control system according to claim 9 ; and
a multi-copter main body including
the motor, and
a propeller that is rotatable by the motor.