US9242566B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9242566-B2 |
| Application number | US-201214113507-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 25, 2012 |
| Priority date | May 6, 2011 |
| Publication date | Jan 26, 2016 |
| Grant date | Jan 26, 2016 |
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Official abstract text for this publication.
A brushless motor control apparatus calculates the number of rotations of an engine based on a cycle of zero-cross points of the phase voltage induced to a sub-coil of a three-phase brushless motor. When the number of rotation of the engine is smaller than the first number of rotations, before it becomes impossible to detect the zero-cross points, the control state of the three-phase brushless motor is changed from the state of phase control by a phase control regulator unit with respect to the AC output voltages to the state of interphase short circuit of motor coils by a short regulator unit. When the number of rotations of the engine exceeds the first number of rotations and the phase voltage becomes the voltage level such that the zero-cross points can be detected, the control state is changed again to the state of phase control by the phase control regulator unit.
Opening claim text (preview).
The invention claimed is: 1. A brushless motor control apparatus configured to drive-control a three-phase brushless motor, and rectify and phase-control alternate current output voltages output from the three-phase brushless motor to charge a battery in a case where the three-phase brushless motor is rotary-driven by an engine and operates as a three-phase alternate current power generator, the brushless motor control apparatus comprising: a three-phase bridge circuit having arms each including a switching element and a diode coupled in inverse parallel to the switching element; a phase voltage detector configured to detect a phase voltage of any one phase of phases of the three-phase brushless motor; a zero-cross point detector configured to detect zero-cross points of the phase voltage of said any one phase detected by the phase voltage detector; a number of engine rotations measurer configured to measure a number of rotations of the engine based on a cycle of the zero-cross points detected by the zero-cross point detector; a phase control regulator unit configured to, when the number of rotations of the engine is greater than or equal to a first number of rotations at which the zero-cross points become unable to be detected, rectify and phase-control the alternate current output voltages of respective phases output from the three-phase brushless motor, and supply the alternate current output voltages to the battery; and a short regulator unit configured to, when the number of rotations of the engine is smaller than the first number of rotations and when a charged voltage of the battery is greater than or equal to a predetermined determination reference voltage, control the switching elements of the three-phase bridge circuit to perform interphase short circuit of the alternate current output voltages output from the three-phase brushless motor, or control the switching elements to be collectively turned off. 2. The brushless motor control apparatus according to claim 1 , wherein the short regulator unit is configured to, when the charged voltage of the battery is greater than or equal to a predetermined determination reference voltage, control the switching elements of the three-phase bridge circuit to perform interphase short circuit of the alternate current output voltages output from the three-phase brushless motor, and the short regulator unit is configured to, when the charged voltage of the battery is smaller than the predetermined determination reference voltage, control the switching elements to be collectively turned off and charge the battery via the diodes based on the alternate current output voltages output from the three-phase brushless motor. 3. The brushless motor control apparatus according to claim 1 , further comprising: a batch off controller configured to, when the number of rotations of the engine is smaller than or equal to a second number of rotations that is smaller than the first number of rotations (first number of rotations>second number of rotations) and is not contributing to charging of the battery, collectively turn off the switching elements of the three-phase bridge circuit. 4. The brushless motor control apparatus according to claim 1 , wherein in a case that the three-phase brushless motor operates as the three-phase alternate current power generator, the brushless motor control apparatus is configured to rectify and phase-control the alternate current output voltages output from the three-phase brushless motor, thus charging the battery, and in a case where the engine is started-up, the brushless motor control apparatus is configured to drive-control the three-phase brushless motor as a starter motor of the engine. 5. A brushless motor control method of drive-controlling a three-phase brushless motor, and rectifying and phase-controlling alternate current output voltages output from the three-phase brushless motor to charge a battery in a case where the three-phase brushless motor is rotary-driven by an engine and operates as a three-phase alternate current power generator, the brushless motor control method comprising: a step of constituting arms of a three-phase bridge circuit, each of the arms including a switching element and a diode coupled in inverse parallel to the switching element; a phase voltage detection step of detecting a phase voltage of any one phase of phases of the three-phase brushless motor; a zero-cross point detection step of detecting zero-cross points of the phase voltage of said any one phase detected in the phase voltage detection step; a number of engine rotations measurement step of measuring a number of rotations of the engine based on a cycle of the zero-cross points detected in the zero-cross point detection step; a phase control regulator step of, when the number of rotations of the engine is greater than or equal to a first number of rotations at which the zero-cross points become unable to be detected, rectifying and phase-controlling alternate current output voltages of respective phases output from the three-phase brushless motor, and supplying the alternate current output voltages to the battery; and a short regulator step of, when the number of rotations of the engine is smaller than the first number of rotations and when a charged voltage of the battery is greater than or equal to a predetermined determination reference voltage, controlling the switching elements of the three-phase bridge circuit to perform interphase short circuit of the alternate current output voltages output from the three-phase brushless motor, or controlling the switching elements to be collectively turned off.
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