Vibration damping apparatus

• US 20070241489A1
• Filed: 04/04/2007
• Published: 10/18/2007
• Est. Priority Date: 04/14/2006
• Status: Active Grant

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Inventors: Fushimi, Takehiko, Mizushima, Daichi
• Granted Patent: US 8,047,512 B2
• Time in Patent Office: Days
• US Class Current: 267/140.140
• CPC Class Codes: F16F 15/03 using magnetic or electromagnetic means F16F9/53, F16F15/005 take precedence

Abstract

A vibration damping apparatus actively damping vibration of a vibration source by adding vibration to the vibration source includes a vibrational state detecting means and a vibrator including a magnetic pole, a coil, and a controlling means, and the vibrator adds vibration to the vibration source by controlling a current-supplied state of the coil to vibrate the coil and the magnetic pole relatively, wherein the controlling means selectively switches a vibration generating mode and a regenerative mode based on the vibrational state of the vibration source, the vibration is added to the vibration source to damp the vibration of the vibration source in the vibration generating mode, and regenerative current is caused by an electro motive force generated at the coil by the vibration of the vibration source to flow into a regenerative resistor in the regenerative mode.

Claims

1. A vibration damping apparatus actively damping vibration of a vibration source by adding vibration to the vibration source, comprising:

a vibrational state detecting means for detecting a vibrational state of the vibration source; and

a vibrator including;

a magnetic pole;

a coil provided so as to intercept magnetic flux formed by the magnetic pole; and

a controlling means electrically connected to the coil, the vibrator adding vibration to the vibration source by controlling a current-supplied state of the coil to vibrate the coil and the magnetic pole relatively,

wherein the controlling means selectively switches a vibration generating mode and a regenerative mode based on the vibrational state of the vibration source, the vibration is added to the vibration source to damp the vibration of the vibration source in the vibration generating mode, and regenerative current is caused by an electro motive force generated at the coil by the vibration of the vibration source to flow into a regenerative resistor in the regenerative mode.

2. A vibration damping apparatus according to claim 1, wherein the vibration source has a rotation machine, the vibrational state detecting means detects a number of revolutions of the rotation machine as the vibrational state, the controlling means switches to the regenerative mode when the number of the revolutions is in a setting range.

3. A vibration damping apparatus according to claim 1, wherein the vibrational state detecting means detects vibration acceleration of the vibration source as the vibrational state, the controlling means switches to the regenerative mode when a variable frequency of the vibration acceleration is in a setting range.

4. A vibration damping apparatus according to claim 2, wherein the vibration generating mode has a vibration generation suppressing mode and a vibration generation implementing mode, the vibration generation suppressing mode is performed when the vibrational state is in a boundary range, which is around the setting range, the controlling means conducts first PWM control in the vibration generation implementing mode and conducts second PWM control in the vibration generation suppressing mode, the first PWM control sets a time period for supplying the current to the coil in accordance with a first relationship in which the time period for supplying the current to the coil becomes longer as the vibration of the vibration source based on a detection result of the vibrational state detecting means becomes larger, and the second PWM control sets the time period for supplying the current to the coil so as to be shorter than the time period for supplying the current to the coil derived from the first relationship.

5. A vibration damping apparatus according to claim 3, wherein the vibration generating mode has a vibration generation suppressing mode and a vibration generation implementing mode, the vibration generation suppressing mode is operated when the vibrational state is in a boundary range, which is around the setting range, the controlling means performs a first PWM control in the vibration generation implementing mode and performs a second PWM control in the vibration generation suppressing mode, the first PWM control sets a time period for supplying the current to the coil in accordance with a first relationship in which the time period for supplying the current to the coil becomes longer as the vibration of the vibration source based on a detection result of the vibrational state detecting means becomes larger, and the second PWM control sets the time period for supplying the current to the coil so as to be shorter than the time period for supplying the current to the coil derived from the first relationship.