# US 9,438,143 B2 · Drive control device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,438,143 B2
- Document ID: US9438143B2
- Status: Granted
- Kind: B2
- Application number: 14/187,177
- Filed: 2014-02-21
- Published: 2014-08-28
- Granted: 2016-09-06
- Earliest claimed: 2013-02-22
- Assignees: Riso Kagaku Corporation
- Applicants: Riso Kagaku Corporation
- Inventors: Masao Suzuki
- Web page: https://patentgrep.com/patent/US9438143B2

## CPC

- H02P 5/68: controlling two or more DC dynamo-electric motors (H02P5/46, H02P5/60 take precedence)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A PWM signal generator section for generating a plurality of PWM signals with different phases to be respectively fed to a plurality of loads, and a phase difference setting section for setting phase differences among the PWM signals are provided. The phase difference setting section sets phase differences Δt_shift(n,n+1) calculated based on an effective current Ia(n) flowing to each of the loads, where the number of the loads is N, according to the equations below: Ia_all = ∑ n = 1 N ⁢ Ia ⁡ ( n ) ⁢ t_shift ⁢ ( n , n + 1 ) = t_pwn × Ia ⁡ ( n ) / Ia_all where n=1 to N (where N is an integer of two or more, and n+1=1 when n+1>N), and t_pwm is a cycle of the PWM signals.

## Claims

### Claim 1

A drive control device for performing drive control of a plurality of loads based on PWM signals, the device comprising:
a PWM signal generator section for generating the PWM signals with different phases to be respectively fed to the loads; and
a phase difference setting section for setting phase differences among the PWM signals,
wherein the phase difference setting section sets phase differences Δt_shift(n,n+1) calculated based on an effective current Ia(n) flowing to each of the loads, where the number of the loads is N, according to the equations below:
Ia_all
=
∑
n
=
1
N
⁢
⁢
Ia
⁡
(
n
)
⁢
t_shift
⁢
(
n
,
n
+
1
)
=
t_pwm
×
Ia
⁡
(
n
)
/
Ia_all
where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, and t_pwm is a cycle of the PWM signals, and
wherein the effective current is an effective value (root mean square) of alternate current that flows to a load.

### Claim 2

A drive control device for performing drive control of a plurality of loads based on PWM signals, the device comprising:
a PWM signal generator section for generating the PWM signals with different phases to be respectively fed to the loads; and
a phase difference setting section for setting phase differences among the PWM signals,
wherein the phase difference setting section sets phase differences Δt_shift(n,n+1) calculated based on an effective voltage Va(n) fed to each of the loads, where the number of the loads is N, according to the equations below:
Va_all
=
∑
n
=
1
N
⁢
⁢
Va
⁡
(
n
)
⁢
t_shift
⁢
(
n
,
n
+
1
)
=
t_pwm
×
Va
⁡
(
n
)
/
Va_all
where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, and t_pwm is a cycle of the PWM signals, and
wherein the effective voltage is an effective value (root mean square) of alternate voltage, which is supplied to a load.

### Claim 3

A drive control device for performing drive control of a plurality of loads based on PWM signals, the device comprising:
a PWM signal generator section for generating the PWM signals with different phases to be respectively fed to the loads; and
a phase difference setting section for setting phase differences among the PWM signals,
wherein the phase difference setting section sets phase differences Δt_shift(n,n+1) calculated based on an effective electric power Pa(n) consumed by each of the loads, where the number of the loads is N, according to the equations below:
Pa
⁡
(
n
)
=
Ia
⁡
(
n
)
×
Va
⁡
(
n
)
Pa_all
=
∑
n
=
1
N
⁢
⁢
Pa
⁡
(
n
)
⁢
t_shift
⁢
(
n
,
n
+
1
)
=
t_pwm
×
Pa
⁡
(
n
)
/
Pa_all
where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, and t_pwm is a cycle of the PWM signals, and
wherein the effective power is an effective value (root mean square) of alternate power, which is consumed by a load.

### Claim 4

A drive control device for performing drive control of a plurality of loads based on PWM signals, the device comprising:
a PWM signal generator section for generating the PWM signals with different phases to be respectively fed to the loads; and
a phase difference setting section for setting phase differences among the PWM signals,
wherein the phase difference setting section sets, in a switchable manner, one of sets of phase differences Δt_shift(n,n+1) calculated according to at least two of the equations (1) to (4) below:
Δt_shift(n,n+1)=t_pwm/N (1)
where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, and t_pwm is a cycle of the PWM signals,
Ia_all
=
∑
n
=
1
N
⁢
⁢
Ia
⁡
(
n
)
⁢
⁢
⁢
t_shift
⁢
(
n
,
n
+
1
)
=
t_pwm
×
Ia
⁡
(
n
)
/
Ia_all
(
2
)
where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, t_pwm is a cycle of the PWM signals, and Ia(n) is an effective current flowing to each of the N loads,
Va_all
=
∑
n
=
1
N
⁢
⁢
Va
⁡
(
n
)
⁢
⁢
⁢
t_shift
⁢
(
n
,
n
+
1
)
=
t_pwm
×
Va
⁡
(
n
)
/
Va_all
(
3
)
where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, t_pwm is a cycle of the PWM signals, and Va(n) is an effective voltage fed to each of the N loads, and
Pa
⁡
(
n
)
=
Ia
⁡
(
n
)
×
Va
⁡
(
n
)
⁢
⁢
Pa_all
=
∑
n
=
1
N
⁢
⁢
Pa
⁡
(
n
)
⁢
⁢
⁢
t_shift
⁢
(
n
,
n
+
1
)
=
t_pwm
×
Pa
⁡
(
n
)
/
Pa_all
(
4
)
where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, t_pwm is a cycle of the PWM signals, and Pa(n) is an effective electric power consumed by each of the N loads,
wherein the effective current is an effective value (root mean square) of alternate current that flows to a load,
wherein the effective voltage is an effective value (root mean square) of alternate voltage, which is supplied to a load, and
wherein the effective power is an effective value (root mean square) of alternate power, which is consumed by a load.

### Claim 5 (depends on 4)

The drive control device as claimed in claim 4, wherein the phase difference setting section selects and sets one of at least two sets of phase differences Δt_shift(n,n+1) based on a total value of the effective currents Ia(n) flowing to the individual loads in each of cases where the at least two sets of phase differences Δt_shift(n,n+1) calculated according to the at least two of the equations (1) to (4) are respectively set for the PWM signals.