TWM500398U - Sensor free motor control device - Google Patents

Description

Sensorless motor control unit

This creation relates to motor control devices, and more particularly to a sensorless motor control device.

With the rapid development of technology and industry, a motor that is very important in the automotive industry and the household appliance industry, a motor that receives electrical energy and converts it into a mechanical energy output, that is, a relative magnetic force changes through the stator and rotor of the motor. Driving the rotor and other mechanical structures or electrical equipment connected to the rotor, because the motor has the advantages of miniaturization, high efficiency, low power consumption and high controllability, the motor is widely used.

Generally speaking, there are many types of motors, which can be classified into an AC motor and a DC motor through initial input power. The AC motor includes a synchronous motor and an induction motor. The DC motor includes a DC brush motor and a Brushless DC motor. In the current situation, the DC brushless motor has better characteristics than the former three. The reason is that the DC brushless motor replaces the brush and the phase converter through the circuit configuration to solve the maintenance problem of the conventional DC motor brush and the phase changer, especially Ground, the DC brushless motor is based on the circuit configuration to generate a magnetic field change in the coil on the stator, thereby driving the rotor to rotate, reducing the configuration of the brush and the shaft of the DC brush motor, avoiding the friction generated by the brush and the shaft, thus making the DC The development of brushless motors has received considerable attention from the industry. However, because the DC brushless motor generates a phase shift through the circuit configuration, it needs to combine the driver and the position sensor to avoid the problem of insufficient phase conversion. The common position sensor includes a Hall sensor. (Hall effect Sensor) and encoder (Encoder), the Hall sensor is the commutation signal of the feedback motor to the controller, the controller regulates the rotation speed, and the Hall sensing device has a low unit price, so that it is mostly used for the control. On low-capacity home appliances; encoders are used for precise density control such as servo control or motor positioning.

Under the development of control theory and power electronics, there is no need to propose a combination of position sensors, which indirectly estimates the rotor position through sensors such as voltage or current signals, and can replace the function of the position sensor. By removing the position sensor and the sensor space on the motor end, the cost and system complexity are further reduced. The position sensorless DC brushless motor is also called the sensorless DC brushless motor. For two types, including Back Electromotive Forces and Direct Rotor Estimation, when the motor has not been rotated, it is necessary to use the terminal voltage to neutral point relationship, corresponding to the zero crossing point of the back electromotive force, or through the reverse The electromotive force cubic synergy component is used to judge the back-EMF zero-crossing point and is regarded as the current commutation reference signal. However, for this purpose, a neutral point voltage or phase shift circuit is required, but generally the motor does not necessarily have a neutral point voltage lead. And the phase shift circuit will have different angles depending on the motor speed, and the position of the motor rotor cannot be accurately estimated, and the back electromotive force estimation method is often applied to the motor. The stability of the rotor is reduced, and the power loss of the rotor is further improved. Despite the above shortcomings, it is still widely used in the industry; the direct rotor estimation method estimates the rotor position signal through the estimation theory or electrical equation. Carrying out cumbersome mathematical calculations and coordinate conversions, because of the need to load high-order processors to increase production costs, and is not used by industry.

According to the above, the control method of the DC sensorless brushless motor is known. The current situation mainly indirectly knows the rotor position signal through the back electromotive force estimation method, but the back electromotive force estimation method is applied to solve the back electromotive force estimation method. Single-phase motors tend to cause rotor stability The problem is reduced, which in turn increases the power loss of the rotor. Therefore, how to provide a sensorless motor control device and improve the application of back EMF estimation method to motor rotor stability and power loss has become an important topic for researchers involved in the industry.

The main purpose of this creation is to provide a sensorless motor control device for improving the stability of the motor operation.

The second objective of this creation is to provide a sensorless motor control device for improving the efficiency of motor operation.

In order to achieve the above-mentioned various purposes and effects, the hardware component of the sensorless control device of the present invention comprises the control unit, the plurality of pre-drive units, the plurality of switch units and the comparison unit, wherein The control unit is electrically coupled to the plurality of pre-drive units, the plurality of pre-drive units are electrically coupled to the plurality of switch units, and the plurality of switch units are electrically coupled to the motor and the comparison unit, the comparison The unit is electrically coupled to the control unit, thereby achieving electrical control of the sensorless motor.

In particular, the present invention provides a first control signal according to the control unit, and the first control signal includes a first start time, the plurality of switch units drive the motor at the first start time and stop driving at the first end time, and the comparison unit outputs the first conversion At a time point, the control unit further calculates a difference between the first termination time point and the first conversion time point to generate a first interval time, and the control unit compares the first interval time with the first threshold value, when the first interval time is not equal to the first threshold When the value is up, the control unit increases or decreases the second start time of the second control signal, and the motor drives and completes the rotation period according to the second start time.

In one embodiment of the present invention, the sensorless motor control device of the present invention, wherein the control unit is configured to drive the plurality of pre-drive signals according to the second control signal to generate the plurality of pre-drive signals The pre-drive signal includes the second start-up time.

In one embodiment of the present invention, the sensorless motor control device of the present invention, wherein the plurality of switch units are configured to receive the plurality of pre-drive signals to generate the plurality of drive signals, the plurality of drive signals One of the third driving signal and the fourth driving signal includes the second starting time.

In one embodiment of the present invention, the sensorless motor control device of the present invention, wherein the first input end and the second input end of the motor respectively receive the fourth driving signal and the third driving signal, The motor is driven according to the second start time and stops driving at a second end time point.

In one embodiment of the present invention, the sensorless motor control device of the present invention, wherein when the comparing unit is configured to capture and calculate a difference in voltage difference between the first input terminal and the second input terminal, And output a second conversion time point.

In one embodiment of the present invention, the sensorless motor control device of the present invention, wherein the control unit is configured to calculate a difference between the second termination time point and the second conversion time point to generate a second interval time. The control unit compares the second interval time with the first threshold value, and when the first interval time is not equal to the first threshold value, the control unit increases or decreases the first startup time of the first control signal.

In one embodiment of the present invention, the sensorless motor control device of the present invention, wherein the control unit is configured to calculate a difference between the second termination time point and the second conversion time point to generate a second interval time. , the control unit compares the first interval time and adds The second interval time and a second threshold value, when the first interval time is added, the second interval time is not equal to the second threshold value, the control unit increases or decreases the first start of the first control signal time.

In one embodiment of the present invention, the sensorless motor control device of the present invention, wherein the first input end and the second input end generate a first phase control signal, the motor is based on the first phase control signal A first rotation is produced.

In one embodiment of the present invention, the sensorless motor control device of the present invention, wherein the first input end and the second input end of the motor generate a signal according to the first driving signal and the second driving signal a first phase control signal, the motor generates a first rotation according to the first phase control signal, and the first input end and the second input end of the motor generate a first signal according to the fourth driving signal and the third driving signal The second phase control signal, the motor generates a second rotation according to the second phase control signal.

In one embodiment of the present invention, the sensorless motor control device of the present invention, wherein the phase difference between the first phase control signal and the second phase control signal is equal to 180 degrees.

1‧‧‧Without sensor motor control

11‧‧‧Control unit

13‧‧‧Pre-drive unit

131‧‧‧First front drive unit

133‧‧‧Second front drive unit

135‧‧‧3rd front drive unit

137‧‧‧Fourth front drive unit

15‧‧‧Switch unit

151‧‧‧First switch unit

153‧‧‧Second switch unit

155‧‧‧third switch unit

157‧‧‧fourth switch unit

17‧‧‧Comparative unit

19‧‧‧Motor

U‧‧‧ first input

V‧‧‧ second input

Vcc‧‧‧ voltage end

GND‧‧‧ ground terminal

P1‧‧‧First phase control signal

P2‧‧‧Second phase control signal

Back-EMF‧‧‧Commutation signal

CAP‧‧‧ comparison signal

△S1‧‧‧First flexible switching time

△S2‧‧‧Second flexible switching time

△N1‧‧‧The first start-up time

△N2‧‧‧The second start-up time

T1‧‧‧ first termination time

T2‧‧‧ first conversion time

T3‧‧‧second termination time

T4‧‧‧ second conversion time point

△F1‧‧‧ first interval

△F2‧‧‧second interval

O1‧‧‧ first zero crossing point

O2‧‧‧Second zero crossing point

The first figure is a circuit diagram of a first embodiment of the sensorless motor control device of the present invention; the second figure: the first step of the first embodiment of the sensorless motor control device of the present invention Flowchart; third diagram: a control timing diagram of the first embodiment of the sensorless motor control device of the present invention; FIG. 4 is a first embodiment of the sensorless motor control device of the present invention First A two-step flow chart; and a fifth figure: a flow chart of the third step of the second embodiment of the sensorless motor control device of the present invention.

In order to give your reviewers a better understanding and understanding of the characteristics of the creation and the efficacies achieved, please refer to the preferred embodiment and the detailed description to explain the following: This creation has no known sensor DC Brushless motor, the current situation mainly through the back EMF estimation method indirectly know the rotor position signal, but the back EMF estimation method to solve the back EMF estimation method applied to the single-phase motor will often cause the rotor stability to decrease, and thus improve The problem of power loss of the rotor. Therefore, how to provide a sensorless motor control device and improve the application of the back electromotive force estimation method to the motor rotor stability and power loss problem is to provide a sensorless motor control device, the motor is first according to the control signal The startup time is driven, and the driving is stopped at the termination time point, and the comparison unit outputs a first conversion time point, wherein the first termination time point is generated by the control unit to the first conversion time point, and the first interval time is generated, and the control unit compares the An interval time and a first threshold value, when the first interval time is not equal to the first threshold value, the control unit increases or decreases the second start time of the second control signal to compensate for the phase conversion error, thereby facilitating the stability of the motor operation. Sex, and further reduce the load on the motor rotor to improve the efficiency of motor operation.

Please refer to the first figure, which is a circuit diagram of a first embodiment of the sensorless motor control device of the present invention. As shown, one of the sensorless motor control devices 1 of the present embodiment has a hardware component. A control unit 11, a plurality of pre-drive units 13, a plurality of switch units 15, a comparison unit 17, and a motor 19, wherein the control unit is included The plurality of pre-drive units 13 are electrically coupled to the plurality of pre-drive units 13 . The plurality of switch units 15 are electrically coupled to the plurality of switch units 15 . The plurality of switch units 15 are electrically coupled to the motor 19 and the comparison unit. 17. The comparison unit 17 is electrically coupled to the control unit 11.

The control unit 11 can be a 555 series chip produced by Signetics, combined with circuit elements such as a variable resistor and a diode, or directly using a micro control chip, and the control unit 11 is configured to receive a pulse width modulation (PWM) signal. The control signal is generated by controlling the duty cycle (Duty Cycle) of the pulse width modulation (PWM) signal, but not limited thereto. In addition, the control unit 11 can be combined with a zero voltage crossover signal acquisition circuit. The zero voltage crossover signal acquisition circuit is configured to provide a phase change signal Back-EMF to the control unit 11.

The control unit 11 can further combine the plurality of pre-drive units 13 for ensuring a lower voltage or current input to the plurality of switch units 15, wherein the plurality of pre-drive units 13 comprise a first The front drive unit 131, the second front drive unit 133, the third front drive unit 135, and the fourth front drive unit 137, and the control unit 11 inputs a first control signal or a second control signal. To the plurality of pre-stage drive units 13.

The plurality of switching units 15 are transistors (FETs), and are preferably an enhancement type MOSFET, and the plurality of switching units 15 include a first switching unit 151, a second switching unit 153, and a third switching unit 155. And a fourth switch unit 157, wherein a gate of the first switch unit 151 is electrically coupled to the first front drive unit 131, and a gate of the second switch unit 153 is electrically coupled to the second front The driving unit 133, the gate of the third switching unit 155 is electrically coupled to the third front driving unit 135, and the gate of the fourth switching unit 157 is electrically coupled to the fourth front driving unit 137. And the plurality of switch units 15 respectively receive the plurality of front stages of the plurality of front stage drive units And a source of the first switching unit 151 and a source of the third switching unit 155 are electrically coupled to a voltage terminal Vcc, and a source of the second switching unit 153 is One source of the fourth switch unit 157 is electrically coupled to a ground GND, and one of the first switch units 151 is electrically coupled to one of the drains of the fourth switch unit 157. Electrically coupled to a first input terminal U of a motor 19, one of the second switch unit 153 is electrically coupled to one of the drains of the fourth switch unit 155, and is electrically coupled One of the motors 19 has a second input terminal V.

The comparison unit 17 can be an operational amplifier or a voltage comparison chip for comparing the magnitude of the current or voltage of one of the positive phase input terminals and the one of the inverting input terminals of the comparison unit 17 , and receiving the plural number of the plurality of switch units 15 The driving signal is electrically coupled to the first input terminal U, the inverting input terminal is electrically coupled to the second input terminal V, and the output of one of the comparing units 17 is electrically The comparison unit 17 is configured to provide a comparison signal when the comparison unit 17 captures and calculates a difference between the voltage difference between the first input terminal U and the second input terminal V, and the comparison signal is provided. The control unit 11 has a first conversion time point or a second conversion time point.

The motor 19 is preferably a single-phase motor, wherein the first input terminal U and the second input terminal V of the motor 19 generate a first phase control signal P1 according to the first driving signal and the second driving signal. The motor 19 generates a first rotation according to the first phase control signal P1, and the first input terminal U and the second input terminal V of the motor 19 generate a second according to the fourth driving signal and the third driving signal. The phase control signal P2, the motor 19 generates a second rotation according to the second phase control signal P2, and the phase difference between the first phase control signal P1 and the second phase control signal P2 is equal to 180 degrees.

Please refer to the second figure and the third figure, which is a first step flow chart and a control sequence diagram of the first embodiment of the sensorless motor control device of the present invention. As shown in the figure, the present embodiment For example, the horizontal axis of the control timing chart is time, the vertical axis is the intensity level or the rotation angle of the rotor, and the embodiment includes the following steps: Step S10: A control unit provides a first control signal to drive a plurality of pre-drive units The plurality of pre-drive units generate a plurality of pre-drive signals, the first control signal and the plurality of pre-drive signals include a first start-up time; and step S20: the plurality of switch units receive the plurality of pre-drivers The signal generates a plurality of driving signals, and the first driving signal and the second driving signal of the plurality of driving signals include the first starting time; and step S30: the first input end and the second input end of one of the motors respectively Receiving the first driving signal and the second driving signal, the motor is driven according to the first starting time, and stops driving at a first termination time point; Step S40: when a comparing unit captures and calculates the first input When the voltage difference between the terminal and the second input terminal is different, and outputting a first conversion time point; and step S50: the control unit calculates the first termination time a difference between the point and the first transition time point, generating a first interval time, the control unit comparing the first interval time with a first threshold value, when the first interval time is not equal to the first threshold value, The control unit increases or decreases one of the second control signals and the second start time.

Before the step S10, the control unit 11 receives the commutation signal Back-EMF, wherein the commutation signal Back-EMF is generated by a back electromotive force estimation method, and the commutation signal corresponds to one of the back electromotive forces. The point O1 is driven to drive the control unit to output the first control signal according to the pulse width modulation (PWM) signal, and the pulse width modulation (PWM) signal is preferably a frequency of 20 KHz and a duty cycle (Duty Cycle) of 60%. In addition, the control unit 11 adopts a means of flexible switching, and sets an element or a program corresponding to the flexible switching.

In step S10, the first control signal is input to the plurality of pre-driver units (Pre-Driver) 13, and a plurality of pre-drive signals are generated according to the first control signal, wherein the plurality of pre-drive signals are flexible. Switching, and increasing the power consumption of the plurality of switch units 15 corresponding to the plurality of switch units 13 from 10% to 60%, to reduce the power loss caused by the startup time of the plurality of switch units 15 That is, the power loss of the current and the voltage output time of the plurality of switching units 15 is to avoid consuming the output power supplied from the voltage terminal Vcc and the ground terminal GND to the motor 19, and the first control signal and the complex number The pre-drive unit includes a first start-up time ΔN1.

In the step S20, the plurality of switch units 15 receive the plurality of pre-drive signals to generate the plurality of drive signals, that is, the first pre-drive unit 131 outputs the pre-drive signal to the first switch unit 151. The first driving signal is generated, and the second driving unit 133 outputs the driving signal to the second switching unit 153 to generate the second driving signal, and the first driving signal and the second driving signal include the The first start time is ΔN1.

In the step S30, the first switch unit 151 and the second switch unit 153 of the plurality of switch units 15 are electrically connected to the first input terminal U and the second input terminal V, respectively. The first phase control signal P1 is generated by the time-dependent voltage change between the first input terminal U and the second input terminal V, and the first phase control signal P1 drives the rotor of the motor 19 to generate the first rotation. And stopping the driving of the motor 19 at one of the first end time points T1 after the first starting time ΔN1, preferably, rotating the rotor of the motor 19 by approximately 180 degrees. The first phase control signal P1 includes a first flexible switching time ΔS1, a first activation time ΔN1, and a second flexible switching time ΔS2. Meanwhile, the first driving signal and the second driving signal are also With The first flexible switching time ΔS1, the second starting time ΔN2, and the second flexible switching time ΔS2 are the same, wherein the first flexible switching time ΔS1 and the second flexible switching time ΔS2 are the same steps. S10, so I won't go into details.

In the step S40, the first switch unit 151 and the second switch unit 153 of the plurality of switch units 15 are turned off according to the plurality of pre-drive signals, and the third switch of the plurality of switch units 15 The unit 155 and the fourth switch unit 157 are turned on and turned on, and the first input terminal U and the second input terminal V start to generate a potential difference change, and the comparison unit 17 outputs the comparison signal CAP to the control unit 11, and the The control unit 11 records the first transition time point T2 according to the comparison signal CAP.

In step S50, the control unit 11 calculates a time difference between the first termination time point T1 and the first conversion time point T2 to generate the first interval time ΔF1, and the control unit 11 compares the first interval time ΔF1 with The first threshold value temporarily stored in the control unit 11 or the comparison unit 17 is compared, and the first interval time ΔF1 and the first threshold value are compared by the control unit 11 when the first interval time ΔF1 is greater than the first threshold value. The first threshold value, the control unit 11 reduces the pre-drive signal by the second start time ΔN2 of the plurality of drive signals according to the second control signal, or when the first interval time ΔF1 is smaller than the first threshold The threshold value is increased, and the control unit 11 increases the pre-drive signal by the second start time ΔN2 of the plurality of drive signals according to the second control signal; wherein the first threshold value in the embodiment is 100 microseconds. And corresponding to the second start-up time ΔN2 is increased or decreased by 60 microseconds.

Please refer to the third figure, which is a flow chart of the second step of the first embodiment of the sensorless motor control device of the present invention. As shown in the figure, it is connected to step S50 of the embodiment, because step S30 After the motor 19 has generated the first rotation, the rotation angle of the rotor of the motor 19 is close to 180 degrees, and the rotor is rotated to 360 degrees to complete the rotation. Rotating the cycle, and then continuing the steps S51-S55, and simultaneously capturing the current information as the basis of the next rotation cycle, the steps S51-55 have the following steps: Step S51: The control unit drives the plural according to the second control signal a plurality of pre-drive units for generating the plurality of pre-drive signals, the plurality of pre-drive signals including the second start-up time; and step S52: the plurality of switch units receiving the plurality of pre-stages Driving the signal to generate the plurality of driving signals, wherein the third driving signal and the fourth driving signal of the plurality of driving signals include the second starting time; and step S53: the first input end and the second input of the motor Receiving the fourth driving signal and the third driving signal respectively, the motor is driven according to the second starting time, and stops driving at a second termination time point; step S54: when the comparing unit captures and calculates the first When a voltage difference between an input terminal and the second input terminal is different, and outputting a second conversion time point; and step S55: the control unit calculates the second termination time a difference between the inter-point and the second transition time point, generating a second interval time, the control unit comparing the second interval time with the first threshold value, when the first interval time is not equal to the first threshold value, The control unit increases or decreases the first start time of the first control signal.

Before the step S51, the control unit 11 receives the commutation signal Back-EMF, and the commutation signal Back-EMF corresponds to the second zero-crossing point O2 of the counter electromotive force, and drives the control unit 11 to adjust according to the pulse width. The variable (PWM) signal outputs the second control signal, wherein the second control signal increases or decreases the second start time ΔN2 according to step S50.

In step S52, the third pre-stage driving unit 135 outputs the pre-stage driving signal to the third switching unit 155, and the fourth pre-stage driving unit 137 outputs the pre-level driving signal. The second driving unit 157 has the same second starting time ΔN2 as the second driving signal and the second driving signal and the plurality of pre-drive signals.

In the step S53, the third switch unit 155 and the fourth switch unit 157 of the plurality of switch units 15 are electrically connected to the second input terminal V and the first input terminal U, respectively. The second phase control signal P2 is generated according to a time-dependent voltage change between the first input terminal U and the second input terminal V, and the second phase control signal P2 drives the rotor of the motor 19 to generate the second rotation, and The motor 19 is stopped to be driven at one of the second end times T3 after the second start time ΔN2. Preferably, the rotor of the motor 19 is rotated to approximately 360 degrees to complete the one rotation cycle of the motor 19. The second phase control signal P2 and the first phase control signal P1 include the first flexible switching time ΔS1 and the second flexible switching time ΔS2, and the second phase control signal P2 has the third driving The signal, the fourth driving signal is the same as the second starting time ΔN2.

In the step S54, the third switch unit 155 and the fourth switch unit 157 are turned off according to the plurality of pre-drive signals, and the first switch unit 151 and the second switch unit 153 are turned on and turned on. The first input terminal U and the second input terminal V are caused to generate a potential difference, the comparison unit 17 outputs the comparison signal CAP to the control unit 11, and the control unit 11 records the second conversion time according to the comparison signal CAP. Point T4.

In step S55, the control unit 11 calculates a time difference between the second termination time point T3 and the second conversion time point T4 to generate the second interval time ΔF2, and the control unit 11 compares the second interval time ΔF2 with The first threshold value pre-stored in the control unit 11 or the comparison unit 17 is compared, and the second interval is compared by the control unit 11 ΔF2 and the first threshold value, when the second interval time ΔF2 is greater than the first threshold value, the control unit 11 reduces the pre-drive signal by the first control signal according to the first control signal. a start time ΔN1, or when the second interval time ΔF2 is less than the first threshold, the control unit 11 causes the pre-drive signal to increase the first start of the plurality of drive signals according to the first control signal Time △ N1.

In this embodiment, the first rotation period of the motor 19 is controlled according to steps S10 to S55, and the phase conversion error of the first half period is recorded in steps S10 to S50, and the second half of the second half period can be corrected according to the message of the first half period in steps S51 to S55. The second start time ΔN2 of the control signal enables the motor 19 to compensate for the error of the phase change of the first half cycle during the operation of the second half cycle, and records the error of the phase change of the second half cycle in steps S51 to S55, according to the second half cycle. The message corrects the first start time ΔN1 of the first control signal in the half cycle of the next operation cycle, and then the step S55 is followed by the step S10 to correct the error of the phase change of the motor 19, thereby improving the operation of the motor 19. The stability during the process further reduces the load on the rotor of the motor 19 and increases the efficiency of operation of the motor 19.

Please refer to the fourth figure, which is a flowchart of the third step of the second embodiment of the sensorless motor control device. As shown in the figure, the embodiment is different from the previous embodiment in that the control unit 11 Comparing the first interval time ΔF1 of the motor 19 in the rotation cycle to the second interval time ΔF2 through a second threshold value, thereby reducing the error of phase conversion after the motor 19 completes one operation cycle; After the step S54 of the first embodiment, the embodiment includes the following steps: Step S61: The control unit drives the plurality of pre-stage driving units according to the second control signal, so that the plurality of pre-stage driving units generate the complex number a pre-drive signal, the plurality of pre-drive signals including the second start time; Step S62: The plurality of switch units receive the plurality of pre-drive signals to generate the plurality of drive signals, and the third drive signal and the fourth drive signal of the plurality of drive signals include the second start time; step S63: The first input end and the second input end of the motor respectively receive the fourth driving signal and the third driving signal, and the motor is driven according to the second starting time, and stops driving at a second termination time point; Step S64: When the comparing unit captures and calculates a difference between the voltage difference between the first input end and the second input end, and outputs a second conversion time point; and step S65: the control unit calculates the second termination a difference between the time point and the second conversion time point, generating a second interval time, the control unit comparing the first interval time to add the second interval time and a second threshold value, when the first interval time is added When the second interval time is not equal to the second threshold value, the control unit increases or decreases the first startup time of the first control signal.

Referring to the fourth figure, as shown in the figure, the steps S61 to S64 of the embodiment are the same as the steps S51 to S54 of the first embodiment, and therefore will not be described again.

Referring to the first figure and the third figure, as shown in the figure, in step S64, the control unit 11 calculates a time difference between the second termination time point T3 and the second conversion time point T4, and generates the second interval time. ΔF2, and the control unit 11 calculates the sum of the first interval time ΔF1 and the second interval time ΔF2 to generate an interval time sum value, and the control unit 11 compares the interval time sum value with the control unit 11 Or the comparison threshold unit 17 pre-stores the second threshold value, and compares the interval time sum value with the first threshold value through the control unit 11, and when the interval time sum value is greater than the first threshold value, the control unit The first driving signal is reduced according to the first control signal by the first driving time ΔN1 of the plurality of driving signals, or when the interval time value is smaller than the first The first threshold time ΔN1 of the plurality of driving signals is increased by the control unit 11 according to the first control signal; wherein the second threshold value in the embodiment is 200 microseconds. And corresponding to the first start-up time ΔN1 is increased or decreased by 60 microseconds, but not limited thereto.

In this embodiment, the first rotation period of the motor 19 is controlled according to steps S10 to S65, and the phase conversion error of the first half period is recorded in steps S10 to S50, and the second half of the second half period can be corrected according to the message of the first half period in steps S61 to S65. The second start time ΔN2 of the control signal enables the motor 19 to compensate for the error of the phase change of the first half cycle during the operation of the second half cycle, and records the error of the phase change of the second half cycle in steps S61 to S65, according to the first half cycle and The message of the second half cycle corrects the first start time ΔN1 of the first control signal in the half cycle of the next operation cycle, and then the step S65 is followed by the step S10 to correct the error of the phase change of the motor 19, thereby improving the motor. 19 is stable during operation and further reduces the load on the rotor of the motor 19 to increase the efficiency of operation of the motor 19.

In summary, the present invention provides a sensorless motor control device, and the control unit causes the first switch unit and the second switch unit to generate the first drive signal and the second drive signal respectively according to the first start time of the first control signal. The first input end and the second input end of the motor respectively receive the first driving signal and the second driving signal, and generate a first phase control signal at the first input end and the second input end, and the first phase control signal is according to the first The start-time driving motor generates a first rotation, and stops driving at a first end time point after the first start-up time. When the comparison unit captures and calculates a difference between the voltage difference between the first input end and the second input end, the output is a conversion time point, the control unit calculates the first termination time point to the first conversion time point, generates a first interval time, compares the first interval time with the first threshold value through the control unit, when the first interval time is not Equal to the first threshold, the control unit increases or decreases the second start time of the second control signal; in addition, the creation further drives the motor to generate the second second control signal through the second start time of the second control signal Rotating, and stopping driving at a second end time point after the second start time, causing the motor to complete one rotation cycle, and then, when the comparison unit captures and calculates a difference in voltage difference between the first input terminal and the second input terminal, Outputting a second conversion time point, the control unit calculates a second termination time point to a second conversion time point, generates a second interval time, and compares the second interval time with the first threshold value by the control unit, when the second interval time is not equal to the first interval time a threshold value, the control unit increases or decreases the first start time of the first control signal, and the creation further compares the second threshold value with the sum of the first interval time and the second interval time by using the second threshold value for Correct the first start time of the drive signal. Therefore, the creation of the first start-up time of the first control signal or the second start-up of the second control signal can be used to compensate the error of the phase change of the motor in the first half cycle or the second half cycle, thereby improving the motor operation. Stability, and further reduce the load on the rotor of the motor to improve the efficiency of motor operation.

Therefore, this creation is a novelty, progressive and available for industrial use. It should be consistent with the patent application requirements of China's patent law. It is undoubtedly a new type of patent application, and the Prayer Council will grant patents as soon as possible.

However, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, the shape, structure, characteristics and spirit described in the scope of the patent application are equally changed. Modifications shall be included in the scope of the patent application of this creation.

1‧‧‧Without sensor motor control

11‧‧‧Control unit

13‧‧‧Pre-drive unit

131‧‧‧First front drive unit

133‧‧‧Second front drive unit

135‧‧‧3rd front drive unit

137‧‧‧Fourth front drive unit

15‧‧‧Switch unit

151‧‧‧First switch unit

153‧‧‧Second switch unit

155‧‧‧third switch unit

157‧‧‧fourth switch unit

17‧‧‧Comparative unit

19‧‧‧Motor

Vcc‧‧‧ voltage end

GND‧‧‧ ground terminal

U‧‧‧ first input

V‧‧‧ second input

Claims (10)

A sensorless motor control device includes: a control unit for providing a first control signal, the first control signal includes a first start time; and a plurality of pre-drive units electrically coupled The control unit, the plurality of pre-stage driving units are configured to receive the first control signal, and generate a plurality of pre-drive signals, the plurality of pre-drive signals including the first start-up time; and a plurality of switch units, the electrical The plurality of pre-drive units are coupled to receive the plurality of pre-drive signals to generate a plurality of drive signals, the plurality of drive signals including the first start-up time; a motor, the electrical The plurality of switch units are coupled to the motor, the motor has a first input end and a second input end, and the first input end and the second input end respectively receive a first driving signal and a second driving signal, the motor For driving according to the first startup time, and stopping driving at a first termination time point; a comparison unit electrically coupled to the plurality of switching units, when the comparison unit Taking a calculation and calculating a difference between the voltage difference between the first input terminal and the second input terminal, and outputting a first conversion time point; wherein the control unit calculates the first termination time point and the first conversion time point a difference between the first interval time and the first interval time, the control unit compares the first interval time with a first threshold value, and when the first interval time is not equal to the first threshold value, the control unit increases or decreases by a second One of the second start times of the control signal. The sensorless motor control device according to claim 1, wherein the control The driving unit is configured to drive the plurality of pre-drive signals according to the second control signal to generate the plurality of pre-drive signals, and the pre-drive signal includes the second startup time. The non-sensor motor control device of claim 2, wherein the plurality of switch units are configured to receive the plurality of pre-drive signals to generate the plurality of drive signals, one of the plurality of drive signals The third driving signal and the fourth driving signal include the second starting time. The non-sensor motor control device of claim 3, wherein the first input end and the second input end of the motor respectively receive the fourth driving signal and the third driving signal, and the motor is based on The second start time is driven and the drive is stopped at a second end time point. The non-sensor motor control device of claim 4, wherein the comparing unit is configured to capture and calculate a difference between a voltage difference between the first input terminal and the second input terminal, and output a The second conversion time point. The non-sensor motor control device of claim 5, wherein the control unit is configured to calculate a difference between the second termination time point and the second conversion time point to generate a second interval time, the control The unit compares the second interval time with the first threshold value, and when the first interval time is not equal to the first threshold value, the control unit increases or decreases the first startup time of the first control signal. The non-sensor motor control device of claim 5, wherein the control unit is configured to calculate a difference between the second termination time point and the second conversion time point to generate a second interval time, the control The unit compares the first interval time with the second interval time and a second threshold value, and when the first interval time is added, the second interval time is not equal to the second threshold value, the control unit increases or decreases the The first start time of the first control signal. The non-sensor motor control device of claim 1, wherein the first input end and the second input end generate a first phase control signal, and the motor generates a first phase control signal according to the first phase control signal. One turn. The non-sensor motor control device of claim 4, wherein the first input end and the second input end of the motor generate a first phase according to the first driving signal and the second driving signal Controlling the signal, the motor generates a first rotation according to the first phase control signal, and the first input end and the second input end of the motor generate a second phase according to the fourth driving signal and the third driving signal Controlling the signal, the motor generating a second rotation according to the second phase control signal. The non-sensor motor control device of claim 9, wherein a phase difference between the first phase control signal and the second phase control signal is equal to 180 degrees.