# US 5,350,983 A · Suspension damper with integrated controls

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- Number: US 5,350,983 A
- Document ID: US5350983A
- Status: Granted
- Kind: A
- Application number: 07/993,561
- Filed: 1992-12-21
- Granted: 1994-09-27
- Earliest claimed: 1992-12-21
- Assignees: Ford Motor Company
- Inventors: John M. Miller; Venkateswara A. Sankaran
- Web page: https://patentgrep.com/patent/US5350983A

## CPC

- F16F 9/42: Cooling arrangements
- B60G 17/002: {by temperature regulation of the suspension unit, e.g. heat operated systems}
- B60G 17/0157: {non-fluid unit, e.g. electric motor}
- B60G 2202/422: Linear motor
- B60G 2400/51: in suspension unit
- B60G 2400/71: of suspension unit
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00})

## Abstract

An electrically powered active suspension system is disclosed having a suspension unit wherein the system controller and the power electronics module are integrated into a single housing with the motor mechanism of the suspension unit.

## Claims

### Claim 1

An electrically powered suspension unit for an automotive vehicle, comprising:
a housing having a predetermined volume;
electric motor means disposed in said housing;
control means electrically connected to said motor means for dynamically developing current commands for said motor means in response to operating parameters of said motor means, said control means disposed adjacent said motor means in said housing;
power module means electrically connected to said motor means and said control means for synthesizing an input current to said motor means in response to said current commands, said power module means disposed in said housing adjacent said motor means; and
cooling means for regulating the temperature in said housing, whereby said motor means, said control means and said power module means are integrated into said housing.

### Claim 2 (depends on 1)

An electrically powered suspension unit according to claim 1, further including capacitor means disposed in said housing adjacent said power module means.

### Claim 3 (depends on 1)

An electrically powered suspension unit according to claim 1, wherein said motor means comprises a brushless, multi-phase electric motor.

### Claim 4 (depends on 1)

An electrically powered suspension unit according to claim 1, wherein said control means includes feedback signal receiving means for receiving feedback signals from said electric motor, said feedback signals comprising a motor current signal, a motor temperature signal, and a motor position signal and developing said current commands in response to said signals.

### Claim 5 (depends on 4)

An electrically powered suspension unit according to claim 4, wherein said feedback signal receiving means comprises a digital signal processor.

### Claim 6 (depends on 5)

An electrically powered suspension unit according to claim 5, wherein said feedback signal receiving means includes a digital AC current sensor and an optical encoder disposed in said housing directly adjacent said motor means.

### Claim 7

An electrically powered suspension system disposed between the sprung and unsprung masses of an automotive vehicle, comprising:
a plurality of electrically powered suspension units, each suspension unit disposed between the sprung and unsprung vehicle masses, each suspension unit including:
a housing having a predetermined volume of between 35-55 in.sup.3 ;
a three phase rotary electric motor disposed in said housing;
control means electrically connected to said motor for dynamically developing current commands for said motor in response to operating parameters of said motor, said control means disposed in said housing adjacent said motor;
power module means electrically connected to said motor and said control means for synthesizing an input current to said motor in response to said current commands, said power module means disposed in said housing adjacent said motor diametrically opposite said control means; and
cooling means for regulating the temperature in said housing, whereby said motor, said control means and said power module means are integrated into said housing.

### Claim 8 (depends on 7)

An electrically powered suspension system according to claim 7, wherein said cooling means includes a plurality of fluid conduits, each of said fluid conduits communication with said control means and said power module means to dissipate heat generated therein.

### Claim 9 (depends on 7)

An electrically powered suspension system according to claim 7, wherein said cooling means includes a plurality of fins formed in said housing, said fins being operative to dissipate heat generated in said housing through communication with ambient air.