A range hood and its control method

Abstract

This invention relates to a range hood and its control method. The range hood includes: a housing with an air intake on the front side; a fan system housed within the housing, the fan system including a volute, an impeller within the volute, and a motor for driving the impeller to rotate; the volute includes a front cover plate with a forward air inlet opposite to the air intake; and further includes: an opening / closing assembly constrained to the front cover plate; and a driving component connected to the opening / closing assembly and capable of driving the opening / closing assembly to open or close the forward air inlet. The advantages are: the range hood has a certain suction power when the baffle is first opened, ensuring that residual odors do not escape when the range hood is first turned on, and significantly reducing the start-up time of the fan system. This guarantees both fan performance during user operation and initial performance of the range hood, improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of oil fume purification technology, and in particular to an oil fume extractor and its control method. Background Technology

[0002] A range hood is a kitchen appliance designed to purify the kitchen environment. It works on the principle of fluid dynamics, using a centrifugal fan installed inside to draw in and exhaust cooking fumes. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. As the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outwards.

[0003] Existing range hoods typically include a housing with an air inlet on the front, and a baffle plate that can rotate relative to the housing to close or open the air inlet. However, existing range hoods have the following limitations in use: First, because the baffle plate takes a certain amount of time to open and the fan system also takes a certain amount of time to start, it is very easy for the fumes and other odors trapped inside the range hood to escape before the fan system starts, causing changes in kitchen smell; Second, because the fan system cannot start when the baffle plate is not open, residual odors are very easy to escape, causing kitchen odor problems.

[0004] To solve the above technical problems, there are two main existing methods: Method 1, removing the baffle plate to keep the air inlet of the range hood always open; Method 2, starting the fan system and the baffle plate together. However, both methods have the following drawbacks: Method 1 results in a loss of smoke guiding effect, making it easy for smoke to escape and reducing the user's cooking experience; Method 2, because the negative pressure generated when the fan system is turned on acts on the baffle plate, it is difficult for the baffle plate to open. Even if the baffle plate can be opened, the drive mechanism that drives the baffle plate will be under load for a long time, thus reducing the service life of the drive mechanism.

[0005] Therefore, further improvements are needed to the existing range hoods. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a range hood that can simultaneously activate the fan system and the smoke baffle, in contrast to the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned range hood, which can reduce the start-up time of the fan system and ensure that the residual odor inside the range hood will not escape when it is first turned on.

[0008] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a range hood, comprising:

[0009] The casing has an air intake on the front side;

[0010] A fan system is housed inside a casing. The fan system includes a volute, an impeller housed inside the volute, and a motor for driving the impeller to rotate. The volute includes a front cover plate, and the front cover plate has a front air inlet that is opposite to the air intake.

[0011] Its features also include:

[0012] The opening and closing mechanism is constrained to the front cover plate;

[0013] The driving component is connected to the opening and closing assembly and can drive the opening and closing assembly to perform opening and closing actions under the drive of the driving component, so as to close or open the front air vent.

[0014] To achieve the closing or opening of the front air vent, the opening and closing assembly consists of a first baffle and a second baffle arranged side by side, the driving component is a drive motor, and the power output shaft of the drive motor is also provided with a transmission mechanism for driving the drive motor to connect with the first baffle and the second baffle respectively, so that the first baffle and the second baffle can move horizontally to move closer to each other or further away from each other.

[0015] There are many types of transmission mechanisms. Preferably, the transmission mechanism includes a lead screw that is mounted on and coaxially arranged on the power output shaft of the drive motor. The lead screw has a first threaded section and a second threaded section with opposite thread directions. The first baffle is threadedly connected to the first threaded section, and the second baffle is threadedly connected to the second threaded section.

[0016] To enable the lead screw to be threadedly connected to the first baffle and the second baffle respectively, the first baffle is provided with a first threaded hole for the lead screw to pass through and be threadedly connected to the first threaded section, and the second baffle is provided with a second threaded hole for the lead screw to pass through and be threadedly connected to the second threaded section.

[0017] To facilitate the installation of the lead screw, the front cover plate is provided with a mounting ring arranged in an annular shape around the outer periphery of the air inlet. The drive motor is mounted on the mounting ring, and the lead screw is constrained on the mounting ring.

[0018] Preferably, both the first baffle and the second baffle are semi-circular, and form a closed mounting ring when the first baffle and the second baffle are close to each other.

[0019] In the above solution, the front side of the housing also has a smoke baffle that can be rotatably disposed in front of the air intake to open or close the air intake.

[0020] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a control method for a range hood as described above, characterized by comprising the following steps:

[0021] Step 1: Control the motor to start at one speed and control the smoke baffle to open;

[0022] Step 2: Obtain the current smoke baffle opening angle a1 and the time t1 taken for the smoke baffle to open from the start of opening until the opening angle is a1;

[0023] Step 3: Obtain the pressure at the outlet of the range hood under the current operating conditions;

[0024] Step 4: Based on the current opening angle a1 of the smoke baffle, the pressure at the outlet of the range hood, and the current motor speed, determine the first operating current I1 and the speed n1 of the motor.

[0025] Step 5: Determine if this is the first time the motor is running. If yes, proceed to step 7; otherwise, proceed to step 6.

[0026] Step 6: Output the second operating current I2 to the motor, I2 = I1, obtain the actual speed n2 of the motor under the current operating current, and proceed to step 8;

[0027] Step 7: Output the second working current I2 to the motor, I2 = 0.5 * p0% * I1, where p0% is the minimum current ratio that makes the smoke baffle just unable to open. Obtain the actual speed n2 of the motor under the current working current, and control the opening and closing component to perform opening and closing actions so that the front air vent part opens.

[0028] Step 8: Calculate the time t2 required for the motor speed to change from n2 to n1 based on the first operating current I1 and the second operating current I2;

[0029] Step 9: Calculate the time t4 required for the smoke baffle to fully open;

[0030] Step 10: Compare t4 and t1, and control the opening and closing components to open and close based on the comparison results, and adjust the size of the opening of the front air vent.

[0031] Step 11: Determine if the smoke baffle is fully open. If yes, proceed to step 12; otherwise, proceed to step 2.

[0032] Step 12: Record the time when the smoke baffle is fully open and update t1;

[0033] Step 13: Control the opening and closing components to open and close, and adjust the front air vent to be fully open;

[0034] Step 14: Following the same method as in Step 4, determine the first operating current I1 of the motor based on the pressure at the outlet of the range hood and the current gear position of the motor, and output the first operating current I1 to the motor.

[0035] To shorten the start-up time of the wind turbine system, the specific control logic for comparison in step 10 is as follows:

[0036] Step 10-1: Determine if t4 is less than t1. If yes, proceed to step 10-2; otherwise, proceed to step 10-3.

[0037] Step 10-2: Determine if t2 is greater than t4. If so, adjust the opening size of the front air vent to make t2 less than t4, and proceed to step 11; otherwise, proceed to step 11.

[0038] Step 10-3: Determine if t2 is greater than t1. If so, adjust the opening size of the front air vent to make t2 less than t1, and proceed to step 11. If not, proceed to step 11.

[0039] By adjusting the opening size of the front air vent, t2 is made smaller than t4 to ensure that the fan system can work before the smoke baffle is fully opened; in addition, t2 is made smaller than t1 to ensure that the fan system can work as soon as the smoke baffle is opened, so that the range hood has suction power and ensures that the residual odor inside the range hood will not escape when it is first turned on.

[0040] Preferably, the following steps are included between step 1 and step 2:

[0041] Step a: Determine if the smoke baffle is open. If yes, proceed to step b; otherwise, proceed to step 2.

[0042] Step b: Obtain the pressure at the outlet of the range hood under the current operating conditions, and determine the first operating current I1 and speed n1 of the motor based on the pressure at the outlet of the range hood and the current gear position of the motor.

[0043] Step c: Output the second operating current I2 to the motor, I2 = p0% * I1, obtain the actual speed n2 of the motor under the current operating current, and proceed to step 8;

[0044] Step d: Control the opening and closing components to open and close the front air vent.

[0045] Step e: Output the second operating current I2 to the motor, where I2 = I1;

[0046] Step f: Control the opening and closing components to open and close, and adjust the front air vent to be fully open.

[0047] To confirm the motor's operating current and speed, in steps 4 and b, a database of relationship curves between the opening angle of the smoke baffle, the pressure at the outlet of the range hood, and the motor's gear position and the motor's operating current and speed is pre-built. The motor's operating current and speed are then obtained by matching the curves in the database.

[0048] When the user turns off the motor, the following steps are also included:

[0049] S1. Adjust the motor current so that the motor runs at the lowest speed;

[0050] S2. Adjust and control the opening and closing components to close the air inlet completely;

[0051] S3. Turn off motor input.

[0052] Compared with the prior art, the advantages of the present invention are as follows: by setting an opening and closing component at the front air inlet of the fan system, the opening and closing component can perform opening and closing actions under the drive of the drive component to close or open the front air inlet, so that the range hood has a certain suction power when the smoke baffle is first opened. This not only ensures that the residual odor inside the range hood will not escape when it is first turned on, but also significantly reduces the start-up time of the fan system. It can guarantee the fan performance during user use and the initial use effect of the range hood, thereby improving the user experience. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of the range hood in an embodiment of the present invention;

[0054] Figure 2 for Figure 1 A partial structural diagram (oil mesh omitted);

[0055] Figure 3 for Figure 2 Schematic diagram of the installation structure of the medium-sized fan system and its opening and closing components;

[0056] Figure 4 for Figure 3 Exploded view;

[0057] Figure 5 for Figure 3 Partial structural diagram (fan system omitted). Detailed Implementation

[0058] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0059] like Figures 1-5As shown, the range hood in this embodiment includes a housing 1, a fan system, and a smoke baffle 13. The housing 1 has an air intake 11 on its front side, and an oil filter 12 is detachably installed at the air intake 11. The smoke baffle 13 is rotatably positioned in front of the air intake 11 to open or close it. The fan system is located inside the housing 1 and includes a volute 21, an impeller 22 within the volute 21, and a motor for driving the impeller 22. The volute 21 includes a front cover plate 211, a rear cover plate, and an annular wall 213 connecting the two. The front cover plate 211 has a forward air inlet 20 opposite to the air intake 11. The motor is constrained on the rear cover plate. The specific structure of this fan system is prior art and will not be described in detail here.

[0060] It also includes an opening and closing assembly 3 constrained on the front cover plate 211 and a driving component 4 driven by the opening and closing assembly 3; and can drive the opening and closing assembly 3 to perform opening and closing actions under the drive of the driving component 4, so as to close or open the front air vent 20.

[0061] like Figure 2 and Figure 3 As shown, in this embodiment, the opening and closing component 3 consists of a first baffle 31 and a second baffle 32 arranged side by side. The driving component 4 is a drive motor. The power output shaft of the drive motor is also provided with a transmission mechanism for driving the drive motor to connect with the first baffle 31 and the second baffle 32 respectively, so that the first baffle 31 and the second baffle 32 can move horizontally to move closer to or further away from each other. Figure 4 and Figure 5 As shown, the transmission mechanism in this embodiment includes a lead screw 51 mounted on and coaxially arranged on the power output shaft of the drive motor. The lead screw 51 has a first threaded section (not shown in the figure) and a second threaded section (not shown in the figure) with opposite thread directions. A first baffle 31 is threadedly connected to the first threaded section, and a second baffle 32 is threadedly connected to the second threaded section. The first baffle 31 has a first threaded hole 311 through which the lead screw 51 passes and is threadedly connected to the first threaded section, and the second baffle 32 has a second threaded hole 321 through which the lead screw 51 passes and is threadedly connected to the second threaded section. Thus, when the lead screw 51 is driven to rotate by the drive member 4, the first baffle 31 and the second baffle 32 can be driven to move closer to each other and gradually close the inlet vent 20, or the first baffle 31 and the second baffle 32 can be driven to move further apart and gradually open the inlet vent 20.

[0062] To facilitate the installation of the opening / closing assembly 3 and the driving component 4, a mounting ring 201 is provided on the front cover plate 211, arranged in an annular shape around the outer periphery of the front air inlet 20. The drive motor is mounted on the mounting ring 201, and the lead screw 51 is constrained on the mounting ring 201. Figures 3-5As shown, in this embodiment, both the first baffle 31 and the second baffle 32 are semi-circular, and form a circular closed mounting ring 201 when the first baffle 31 and the second baffle 32 are close to each other.

[0063] The control method for the range hood in this embodiment includes the following steps:

[0064] Step 1: Control the motor to start at one speed and control the smoke baffle to open;

[0065] Step 2: Obtain the current smoke baffle opening angle a1 and the time t1 taken for the smoke baffle to open from the start of opening until the opening angle is a1;

[0066] Step 3: Obtain the pressure at the outlet of the range hood under the current operating conditions;

[0067] Step 4: Based on the current opening angle a1 of the smoke baffle, the pressure at the outlet of the range hood, and the current motor speed, determine the first operating current I1 and the speed n1 of the motor.

[0068] In this embodiment, a library of relationship curves between the opening angle of the smoke baffle, the pressure at the outlet of the range hood, and the gear position of the motor and the working current and speed of the motor are pre-built, and the working current and speed of the motor are obtained by searching and matching in the relationship curve library;

[0069] Step 5: Determine if this is the first time the motor is running. If yes, proceed to step 7; otherwise, proceed to step 6.

[0070] Step 6: Output the second operating current I2 to the motor, I2 = I1, obtain the actual speed n2 of the motor under the current operating current, and proceed to step 8;

[0071] Step 7: Output the second working current I2 to the motor, I2 = 0.5 * p0% * I1, where p0% is the minimum current ratio that makes the smoke baffle just unable to open. Obtain the actual speed n2 of the motor under the current working current, and control the opening and closing component to perform opening and closing actions so that the front air vent part opens.

[0072] In this embodiment, the opening diameter of the air inlet is c1, where c1 is the nominal diameter and is calculated as c1 = s / π, where s is the cross-sectional perimeter of the air inlet. Figure 3 As shown, the front air vent is adjusted in a square fan shape, but a circular adjustment can also be achieved through other methods; c1 = p1% * d0, p1 ∈ [0.2, 0.5], the value of p1 is determined by the motor gear, the higher the motor gear, the larger the value of p1; the lower the motor gear, the smaller the value of p1; d0 is the maximum diameter that the front air vent can open;

[0073] Step 8: Calculate the time t2 required for the motor speed to change from n2 to n1 based on the first operating current I1 and the second operating current I2;

[0074] Step 9: Calculate the time t4 required for the smoke baffle to fully open;

[0075] In this embodiment, the current smoke baffle opening angle a2 and the time t3 taken from the start of opening the smoke baffle to the opening angle a2 are obtained; and the time t4 taken for the smoke baffle to be fully opened is estimated based on a1, a2, t1 and t3.

[0076] t4 can be calculated using the following formula, where a3 is the opening angle of the smoke baffle when it is fully open, and this angle is a preset value; the formula for calculating t4 is:

[0077] (a2-a1) / (t2-t1)=(a3-a2) / (t4-t2);

[0078] Step 10: Compare t4 and t1, and control the opening and closing components to open and close based on the comparison results, and adjust the size of the opening of the front air vent.

[0079] In this embodiment, the specific control logic for the comparison in step 10 is as follows:

[0080] Step 10-1: Determine if t4 is less than t1. If yes, proceed to step 10-2; otherwise, proceed to step 10-3.

[0081] Step 10-2: Determine if t2 is greater than t4. If so, adjust the opening size of the front air vent to make t2 less than t4, and proceed to step 11; otherwise, proceed to step 11.

[0082] Step 10-3: Determine if t2 is greater than t1. If so, adjust the opening size of the front air vent to make t2 less than t1, and proceed to step 11; otherwise, proceed to step 11.

[0083] Step 11: Determine if the smoke baffle is fully open. If yes, proceed to step 12; otherwise, proceed to step 2.

[0084] Step 12: Record the time when the smoke baffle is fully open and update t1 with the time when the smoke baffle is fully open;

[0085] Step 13: Control the opening and closing components to open and close, and adjust the front air vent to be fully open;

[0086] Step 14: Following the same method as in Step 4, determine the first operating current I1 of the motor based on the pressure at the outlet of the range hood and the current gear position of the motor, and output the first operating current I1 to the motor.

[0087] In addition, the following steps are included between step 1 and step 2:

[0088] Step a: Determine if the smoke baffle is open. If yes, proceed to step b; otherwise, proceed to step 2.

[0089] Step b: Obtain the pressure at the outlet of the range hood under the current operating conditions, and determine the first operating current I1 and speed n1 of the motor based on the pressure at the outlet of the range hood and the current gear position of the motor.

[0090] Similarly, in this step, a library of relationship curves between the opening angle of the smoke baffle, the pressure at the outlet of the range hood, and the gear position of the motor and the working current and speed of the motor are pre-built, and the working current and speed of the motor are obtained by searching and matching in the relationship curve library.

[0091] Step c: Output the second operating current I2 to the motor, I2 = p0% * I1, obtain the actual speed n2 of the motor under the current operating current, and proceed to step 8;

[0092] Step d: Control the opening and closing components to open and close the front air vent.

[0093] In this embodiment, the opening diameter of the front air vent is c2, and the diameter c2 is the nominal diameter. The specific working process can be referred to the content shown in step 7.

[0094] Step e: Output the second operating current I2 to the motor, where I2 = I1;

[0095] Step f: Control the opening and closing components to open and close, and adjust the front air vent to be fully open.

[0096] All the above steps correspond to the control logic when the user turns on the range hood. When the user turns off the motor, the following steps are also included:

[0097] S1. Adjust the motor current so that the motor runs at the lowest speed;

[0098] S2. Adjust and control the opening and closing components to close the air inlet completely;

[0099] S3. Turn off motor input.

[0100] This embodiment significantly reduces the start-up time of the fan system, allowing it to enter the fume extraction state earlier, thus improving fume extraction performance. It effectively prevents odors remaining inside the range hood from escaping during the opening of the baffle plate, enhancing the fume and odor extraction effect during operation. Furthermore, it enables simultaneous opening of the fan system and the baffle plate, maximizing fan performance without affecting the lifespan of the baffle plate drive structure, greatly expanding the fan's application scenarios. Secondly, the opening and closing components allow for adjustment of the range hood's operating status during operation, significantly improving the start-up performance of the fan system and enhancing the range hood's operational stability.

Claims

1. A control method for a range hood, the range hood comprising: The casing (1) has an air intake (11) on the front side; The fan system is located inside the casing (1). The fan system includes a volute (21), an impeller (22) located inside the volute (21), and a motor for driving the impeller (22) to rotate. The volute (21) includes a front cover plate (211), and the front cover plate (211) has a front air inlet (20) that is opposite to the air inlet (11). Its features also include: The opening and closing assembly (3) is constrained to the front cover plate (211); The driving component (4) is connected to the opening and closing component (3) and can drive the opening and closing component (3) to perform opening and closing actions under the drive of the driving component (4) to close or open the front air vent (20). The front side of the housing (1) also has a smoke baffle (13) that is rotatably disposed in front of the air intake (11) to open or close the air intake (11); The control method for the above-mentioned range hood includes the following steps: Step 1: Control the motor to start at one speed and control the smoke baffle to open; Step 2: Obtain the current smoke baffle opening angle a1 and the time t1 taken for the smoke baffle to open from the start of opening until the opening angle is a1; Step 3: Obtain the pressure at the outlet of the range hood under the current operating conditions; Step 4: Based on the current opening angle a1 of the baffle, the pressure at the outlet of the range hood, and the current motor speed, determine the first operating current I1 and the speed n1 of the motor. Step 5: Determine if this is the first time the motor is running. If yes, proceed to step 7; otherwise, proceed to step 6. Step 6: Output the second operating current I2 to the motor, I2 = I1, obtain the actual speed n2 of the motor under the current operating current, and proceed to step 8; Step 7: Output the second working current I2 to the motor, I2 = 0.5 * p0% * I1, where p0% is the minimum current ratio that makes the smoke baffle just unable to open. Obtain the actual speed n2 of the motor under the current working current, and control the opening and closing component to perform opening and closing actions so that the front air vent part opens. Step 8: Calculate the time t2 required for the motor speed to change from n2 to n1 based on the first operating current I1 and the second operating current I2; Step 9: Calculate the time t4 required for the smoke baffle to fully open; Step 10: Compare t4 and t1, and control the opening and closing components to open and close based on the comparison results, and adjust the size of the opening of the front air vent. Step 11: Determine if the smoke baffle is fully open. If yes, proceed to step 12; otherwise, proceed to step 2. Step 12: Record the time when the smoke baffle is fully open and update t1; Step 13: Control the opening and closing components to open and close, and adjust the front air vent to be fully open; Step 14: Following the same method as in Step 4, determine the first operating current I1 of the motor based on the pressure at the outlet of the range hood and the current gear position of the motor, and output the first operating current I1 to the motor.

2. The control method according to claim 1, characterized in that: The opening and closing assembly (3) consists of a first baffle (31) and a second baffle (32) arranged side by side. The driving component (4) is a drive motor. The power output shaft of the drive motor is also provided with a transmission mechanism for driving the drive motor to connect with the first baffle (31) and the second baffle (32) respectively, so that the first baffle (31) and the second baffle (32) can move side by side and move closer to each other or further away from each other.

3. The control method according to claim 2, characterized in that: The transmission mechanism includes a lead screw (51) disposed on and coaxially arranged on the power output shaft of the drive motor. The lead screw (51) has a first threaded section and a second threaded section with opposite thread directions. The first baffle (31) is threadedly connected to the first threaded section, and the second baffle (32) is threadedly connected to the second threaded section.

4. The control method according to claim 3, characterized in that: The first baffle (31) has a first threaded hole (311) through which the lead screw (51) passes and is threadedly connected to the first threaded section, and the second baffle (32) has a second threaded hole (321) through which the lead screw (51) passes and is threadedly connected to the second threaded section.

5. The control method according to claim 4, characterized in that: The front cover plate (211) is provided with a mounting ring (201) arranged in an annular shape around the outer periphery of the front air inlet (20). The drive motor is mounted on the mounting ring (201), and the lead screw (51) is constrained on the mounting ring (201).

6. The control method according to claim 5, characterized in that: The first baffle (31) and the second baffle (32) are both semi-circular, and form a circular closed mounting ring (201) when the first baffle (31) and the second baffle (32) are close to each other.

7. The control method according to claim 1, characterized in that: The specific control logic for the comparison in step 10 is as follows: Step 10-1: Determine if t4 is less than t1. If yes, proceed to step 10-2; otherwise, proceed to step 10-3. Step 10-2: Determine if t2 is greater than t4. If so, adjust the opening size of the front air vent to make t2 less than t4, and proceed to step 11; otherwise, proceed to step 11. Step 10-3: Determine if t2 is greater than t1. If so, adjust the opening size of the front air vent to make t2 less than t1, and proceed to step 11. If not, proceed to step 11.

8. The control method according to claim 7, characterized in that: The following steps are also included between step 1 and step 2: Step a: Determine if the smoke baffle is open. If yes, proceed to step b; otherwise, proceed to step 2. Step b: Obtain the pressure at the outlet of the range hood under the current operating conditions, and determine the first operating current I1 and speed n1 of the motor based on the pressure at the outlet of the range hood and the current gear position of the motor. Step c: Output the second operating current I2 to the motor, I2 = p0% * I1, obtain the actual speed n2 of the motor under the current operating current, and proceed to step 8; Step d: Control the opening and closing components to open and close the front air vent. Step e: Output the second operating current I2 to the motor, where I2 = I1; Step f: Control the opening and closing components to open and close, and adjust the front air vent to be fully open.

9. The control method according to claim 8, characterized in that: In both steps 4 and b, a database of relationship curves between the opening angle of the smoke baffle, the pressure at the outlet of the range hood, the gear position of the motor, and the operating current and speed of the motor are pre-built, and the operating current and speed of the motor are obtained by searching and matching in the database.

10. The control method according to any one of claims 1 to 9, characterized in that: When the user turns off the motor, the following steps are also included: S1. Adjust the motor current so that the motor runs at the lowest speed; S2. Adjust and control the opening and closing components to close the air inlet completely; S3. Turn off motor input.

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