TH95579A - Brushless motor control device And how to control the brushless motor - Google Patents

Abstract

This invention, DC60, presents a brushless motor controller that drives a brushless motor with three-phase coils of U, V, and W, with the neutral wire at the stator. It is designed with a sub-coil at one of the U, V, or W phases to detect the induced voltage in that phase's coil. The controller provides a power supply function that applies a 120-degree current to each phase of the brushless motor coil below a specified speed and a 180-degree current to each phase above the specified speed. This brushless motor controller incorporates a current rise detection circuit that, when the brushless motor is stopped, selects two phases from the U, V, and W coils, applies a specified positive and negative DC voltage between them, and detects the current flowing to those two coils. A rotor stop position detection component determines the rotor stop position of the brushless motor. Based on the current flowing into each phase coil, detected by the current-gap detection circuit, and the zero-cut-off circuit that detects the zero-cut-off point of each phase coil U, V, W at 120 degrees of power supply to the brushless motor, a zero-cut-off signal is generated. The rotor position detection section uses the zero-cut-off signal to determine the rotor position of the brushless motor, based on the zero-cut-off signals of each phase coil U, V, W, generated by the zero-cut-off detection circuit, to output rotor position information 1. A triangle wave generator circuit detects the output voltage of the sub-coil at 180 degrees of power supply to the brushless motor, generating a triangle wave signal synchronized with this output voltage. The rotor position detection section uses the triangle wave signal to determine the rotor position of the brushless motor, based on the triangle wave signal generated by the triangle wave generator circuit, to output rotor position information 2. Finally, the motor control section controls the brushless motor based on this information. This invention presents a brushless motor control device that drives a brushless motor with three-phase coils of U, V, W and a neutral wire at the stator. It also incorporates a sub-coil at one of the U, V, or W phases to detect the induced voltage at that phase coil, and a power supply control function that applies 120 degrees of power to each coil phase of the brushless motor when the specified rotational speed is below that speed, and 180 degrees of power to each coil phase when the specified speed is above that speed. This device incorporates a current-rising detection circuit for the brushless motor. The system, when the motor is stopped, selects two phase coils sequentially from among the coils of each phase of U, V, and W. A specified positive and negative DC voltage is applied between the two selected phase coils. The current flowing to these two coils is detected, and the rotor position detection section determines the rotor stop position of the brushless motor based on the current flowing to each phase coil detected by the current rise detection circuit. A zero-cut detection circuit detects the zero-cut point of each phase coil of U, V, and W at 120 degrees of power supply to generate a zero-cut signal. The rotor position detection section uses this zero-cut signal to determine the rotor position of the brushless motor based on the zero-cut signals of each phase coil of U, V, and W, which are generated by the zero-cut detection circuit. This outputs the rotor position as the first rotor position data. Finally, a triangle wave generator detects the output voltage of the sub-coil at 180 degrees of power supply to generate a triangle wave signal. The triangle waveform, synchronized with this output voltage, and the rotor position sensing section, using a triangle waveform signal, determine the rotor position of the brushless motor based on the triangle waveform signal generated by the triangle waveform generator. This signal is then output as rotor position information (Rotor 2). The motor control section controls the brushless motor based on the rotor stop position information at the start time, and controls the brushless motor based on the rotor 1 position information at the 120-degree power supply time, and controls the brushless motor based on the rotor 2 position information at the 180-degree power supply time.

Claims (6)

Revised 16/11/2018, Page 1 of 5. Claim 1: A brushless motor control device that drives a brushless motor with three-phase coils (U, V, W) and a neutral wire at the stator. It is designed with a sub-coil at one of the U, V, or W phases to detect the induced voltage in that phase's coil. It also has a power control function that supplies 120 degrees of power to each phase coil of the brushless motor if the motor's rotational speed is below or equal to the set speed, and 180 degrees if the motor's rotational speed is above or equal to the set speed. This brushless motor control device includes a current rise detection circuit that, when the brushless motor is stopped, selects two phase coils in sequence from the U, V, and W phases and applies a specified positive and negative DC voltage between the two selected coils. The system detects the current flowing to the coils of the selected two phases, and the rotor stop position detection section determines the rotor stop position of the brushless motor based on the coil current data of each phase detected by the current rise detection circuit. A zero-cut detection circuit detects the zero-cut point of each coil phase of U, V, and W at 120 degrees of power supply to the brushless motor to generate a zero-cut signal. The rotor position detection section uses the zero-cut signal to determine the rotor position of the brushless motor based on the zero-cut signals of each coil phase of U, V, and W generated by the zero-cut detection circuit, outputting this as rotor position 1 data. A triangle wave generator circuit detects the output voltage of the sub-coil at 180 degrees of power supply to the brushless motor to generate a triangle wave signal synchronized with this output voltage. Finally, the rotor position detection section uses the triangle wave signal generated by the triangle wave generator circuit to determine the rotor position of the brushless motor based on the triangle wave signal generated by the triangle wave generator circuit. To output the position data of the second rotor and control the brushless motor based on the rotor stop position data at the start time of the brushless motor, and control the brushless motor based on the first rotor position data at the 120-degree power supply time, and control the brushless motor based on the second rotor position data at the 180-degree power supply time. 1. A brushless motor controller that drives a brushless motor with three-phase coils (U, V, W) and a neutral wire at the stator. It is designed with sub-coils at any one of the U, V, or W phases to detect the induced voltage in that phase's coil. The controller also has a power control function that applies a 120-degree voltage to each phase coil of the brushless motor when the speed is below the specified limit, and a 180-degree voltage when the speed is above the specified limit. This brushless motor controller incorporates a current-rising detection circuit; when the brushless motor is stopped, it selects two phase coils from the U, V, and W phases, applies specified positive and negative DC voltages between them, and detects the current flowing to those two coils. Finally, it includes a rotor stop position detection unit to determine the rotor stop position of the brushless motor. Based on the current flowing into each phase coil, which is detected by the current-running detection circuit, and the zero-cutting circuit that detects the zero-cut point of each phase coil U, V, W at 120 degrees of power supply to the brushless motor, a zero-cutting signal is generated. The rotor position detection section uses the zero-cutting signal to determine the rotor position of the brushless motor. Based on the zero-cutting signals of each phase coil U, V, W, this signal is generated by the zero-cutting detection circuit and outputs as rotor position information 1. A triangle wave generator circuit detects the output voltage of the sub-coil at 180 degrees of power supply to the brushless motor, generating a triangle wave signal synchronized with this output voltage. The rotor position detection section uses the triangle wave signal to determine the rotor position of the brushless motor. Based on the triangle wave signal generated by the triangle wave generator circuit, this signal is output as rotor position information 2. Finally, the motor control section controls the brushless motor based on the rotor stop position information at the start-up time. And control the brushless motor based on the rotor position data of rotor 1 at the specified power supply time of 120 degrees, and control the brushless motor based on the rotor position data of rotor 2 at the specified power supply time of 180 degrees. 2. A brushless motor control device under claim 1, comprising a speed calculation component that calculates the engine rotational speed and a motor control component, shall select the 120-degree power supply from motor start-up until reaching the specified rotational speed, and the 180-degree power supply from the specified rotational speed above, based on the engine rotational speed data calculated by the engine rotational speed calculation component. It shall also select the rotor position 1 data at the 120-degree power supply time and the rotor position 2 data at the 180-degree power supply time to control the brushless motor. 3. The brushless motor control device under claim 1, where the triangle wave generator circuit generates the said triangle wave signal in both cases of 120-degree power supply and 180-degree power supply, along with the rotor position detection unit, where the triangle wave signal determines the rotor position based on the triangle wave generated by the said triangle wave generator circuit in both cases of 120-degree power supply and 180-degree power supply. 4. A brushless motor control device under claim 3 containing a rotor position switching decision section that compares the engine rotational speed obtained from the engine speed calculation section with a specified rotational speed to determine whether to switch rotor position 1 with rotor position 2, and outputs a switching signal if it is determined that switching should be performed; a rotor position accuracy decision section that determines the consistency of rotor position 1 with rotor position 2 based on a specified criterion using the switching signal output from the rotor position switching decision section; and a rotor position switching section that switches rotor position 1 with rotor position 2 and outputs the result to the motor control unit if consistency is determined by the rotor position accuracy decision section. 5. A brushless motor controller that drives a brushless motor with three-phase coils (U, V, W) and a neutral wire at the stator. It is designed with sub-coils at one of the U, V, or W phases to detect the induced voltage in that phase's coil. The controller has a power control function that applies a 120-degree current to each phase coil of the brushless motor when the speed is below the specified limit, and a 180-degree current when the speed is above the specified limit. This brushless motor controller incorporates a current-rising detection circuit; when the brushless motor is stopped, it selects two phase coils from the U, V, and W phases, applies specified positive and negative DC voltages between them, and detects the current flowing to those two coils. A rotor stop position detection section determines the rotor stop position of the brushless motor. Based on the current flowing into each phase coil, which is detected by the current-rising detection circuit, and the zero-cutting circuit that detects the zero-cut point of each phase coil U, V, W at 120 degrees of power supply to the brushless motor, a zero-cutting signal is generated. The rotor position detection section uses the zero-cutting signal to determine the rotor position of the brushless motor. Based on the zero-cutting signals of each phase coil U, V, W, generated by the zero-cutting circuit, the rotor position data (1st position) is outputted as rotor position information. The rotor position detection section measures the zero-cutting time at 180 degrees of power supply to detect the output voltage of the sub-coil and the zero-cutting of that output voltage. The timing of the consecutive zero-cutting times of the detected output voltage is then calculated and used as the basis for determining the rotor position of the brushless motor, outputting the position data. The second rotor position and the motor control unit that controls the brushless motor are based on the information of the rotor stop position at the start time of the brushless motor, and control the brushless motor based on the information of the first rotor position at the 120-degree power supply time, and control the brushless motor based on the information of the second rotor position at the 180-degree power supply time. 6. Brushless Motor Control Device: A brushless motor control device drives a brushless motor used as a starting motor for an engine. It consists of three-phase coils (U, V, W) with a neutral wire in the stator. It also includes sub-coils in one of the U, V, or W phases to detect the induced voltage in that phase's coil. The control function applies a 120-degree voltage to each coil phase of the brushless motor when the motor's rotational speed is below a specified level, and a 180-degree voltage when the specified speed is above. This control method utilizes a current-raising detection process. When the brushless motor is stopped, it selects two coils from the U, V, or W phases and applies a specified positive and negative DC voltage between them, while also detecting the current flowing to those two coils. The rotor stop position detection section determines the rotor stop position of the brushless motor based on the current flowing to each phase coil, which is detected by the current-rising detection step. The zero-cut detection step detects the zero-cut point of each phase coil of U, V, and W at 120 degrees of power supply to the brushless motor to generate a zero-cut signal. The rotor position detection step uses this zero-cut signal to determine the rotor position of the brushless motor based on the zero-cut signals of each phase coil of U, V, and W, which are generated by the zero-cut detection step, to output as rotor position 1 data. The triangle wave generation step detects the output voltage of the sub-coil at 180 degrees of power supply to the brushless motor to generate a triangle wave signal synchronized with this output voltage. Finally, the rotor position detection section uses this triangle wave signal to determine the rotor position of the brushless motor based on the triangle wave signal generated by the triangle wave generation step. To output as the position data of the 2nd rotor and the motor control procedure that controls the brushless motor based on the rotor position data, stopping at the start time of the brushless motor, and controlling the brushless motor based on the position data of the 1st rotor at the 120-degree power supply time, and controlling the brushless motor based on the position data of the 2nd rotor at the 180-degree power supply time. 7. The brushless motor control device in the brushless motor control device that drives the brushless motor used as the engine starting motor has a 3-phase coil element of U, V, W with a neutral wire at the stator, as well as being designed with a sub-coil at one of the U, V, W phases to detect the induced voltage at the coil of that phase. It also has a power supply control function that supplies 120 degrees of power to each phase coil of the brushless motor when the rotational speed of the brushless motor is below the specified rotational speed, and supplies 180 degrees of power when the rotational speed is above the specified rotational speed. This device controls a brushless motor and incorporates several steps: a current-rising step, which, when the brushless motor is stopped, selects two phase coils sequentially from among the U, V, and W phase coils, applies a specified positive and negative DC voltage between the selected two phase coils, and detects the current flowing to those coils; a rotor stop position step, which determines the rotor stop position of the brushless motor based on the current flowing to each phase coil detected by the current-rising step; a zero-cutting step, which detects the zero-cut point of each U, V, and W phase coil at 120 degrees of power supply to generate a zero-cut signal; and a rotor position step, which uses the zero-cut signal to determine the rotor position of the brushless motor based on the zero-cut signals of the U, V, and W phase coils generated by the zero-cutting step, to produce an output. The rotor position data 1 and the rotor position detection procedure, by measuring the zero-cut time at 180 degrees of power supply time for the brushless motor, detect the output voltage of the sub-coil and the zero-cut of that output voltage. The time between the consecutive zero-cuts of the detected output voltage is then measured. The calculated timing from this consecutive zero-cut time is used as the basis for determining the rotor position of the brushless motor. This output is then used as rotor position data 2. The motor control system then operates the brushless motor based on the rotor position data at the start time of the brushless motor, based on the rotor position data 1 at 120 degrees of power supply time, and finally, based on the rotor position data 2 at 180 degrees of power supply time.