Motor speed controller and speed control system

Patent metadata

Field	Value
Publication number	US-11817801-B2
Application number	US-201916726062-A
Country	US
Kind code	B2
Filing date	Dec 23, 2019
Priority date	Dec 25, 2018
Publication date	Nov 14, 2023
Grant date	Nov 14, 2023

Abstract

An electric motor speed controller includes a processor connected to the following terminals, a base voltage terminal receiving a base voltage, a first voltage terminal provided with a constant voltage, and a second voltage terminal receiving a first motor coil voltage from the processor, and a third voltage terminal receiving a second motor coil voltage from the processor. The processor provides a first control period having the second motor coil voltage be zero and a second control period having the first motor coil voltage be zero. The processor determines the motor speed by controlling a difference between a first time period in the first control period and a second time period in the second control period. The first time period corresponds to a first output voltage increase and the second time period corresponds to a second output voltage increase.

First claim

What is claimed is:

1. A speed controller for determining and controlling operation speeds of a motor, the speed controller comprising:
a processor operable to send control signals and receive feedback signals;
a base voltage terminal electrically connected to the processor and receiving a base voltage U+;
a first voltage terminal electrically connected to the processor and provided with a constant voltage;
a second voltage terminal electrically connected to the processor and receiving a first motor coil voltage U 2 determined by the processor; and
a third voltage terminal electrically connected to the processor and receiving a second motor coil U 3 voltage determined by the processor;
wherein the processor provides a first control period T 1 having the second motor coil voltage of the third voltage terminal be zero and a second control period having the first motor coil voltage U 2 of the second voltage terminal be zero, and wherein the processor determines a rotation speed of the motor by controlling a value difference between a first time period t 1 in the first control period T 1 and a second time period t 3 in the second control period, the first time period t 1 corresponding to a first increase in an output voltage U 0 and the second time period t 3 corresponding to a second increase in the output voltage U 0 ,
wherein the output voltage U o , the base voltage U + constant voltage U 1 , the first motor coil voltage U 2 , and the second motor coil voltage U 3 satisfy the following relationship:

U
O

=

U
+

+

U
+

C
F

⁢

∫

(

1

R
1

+

1

R
2

+

1

R
3

)

⁢
dt

-

1

C
F

⁢

∫

(

U
1

R
1

+

U
2

R
2

+

U
3

R
3

)

⁢
dt

wherein C F is a value of a capacitor in an amplifier integrator circuit and R 1 , R 2 , and R 3 are values of respective resistors between the first voltage terminal, the second voltage terminal and the third voltage terminal and the amplifier integrator circuit.

2. The speed controller of claim 1 , wherein the processor receives a feedback signal produced from the output voltage U 0 .

3. The speed controller of claim 1 , wherein a value RS of armature and brush resistance of the motor and a value R Sense of a resistor sensor measuring motor coil current of the motor satisfy the following relationship:

R
s

=

R
2

⁢

R
Sense

R
3

4. The speed controller of claim 3 , wherein a first time difference between the first control period T 1 and the first time period t 1 is the same as a second time difference between the second control period T 2 and the second time period t 3 , the first time difference denoted to and the second time difference denoted t 2 .

5. The speed controller of claim 4 , wherein the rotation speed n of the motor is proportional to a constant value difference between t 3 and t 1 .

6. The speed controller of claim 5 , wherein the rotation speed n and the constant value difference between t 3 and t 1 satisfy the following relationship:

n
=

R
2

t
0

⁢

K
E

⁡

[

U
+

⁡

(

1

R
1

+

1

R
2

Assignees

• Johnson Controls Tyco IP Holdings LLP

Inventors

• Hu Menghua
• Li Jinbao
• Zhou Yufeng
• Wang Shuqing
• Ren Zuolin

Classifications

• H02P7/063 Primary

  using centrifugal devices, e.g. switch, resistor · CPC title

• H02P7/29 Primary

  using pulse modulation · CPC title